Biochemical response to substrate reduction therapy versus enzyme replacement therapy in Gaucher disease type 1 patients
- Bouwien E. Smid†1,
- Maria J. Ferraz†2,
- Marri Verhoek3,
- Mina Mirzaian2,
- Patrick Wisse4,
- Herman S. Overkleeft4,
- Carla E. Hollak1 and
- Johannes M. Aerts3, 5Email author
© Smid et al. 2016
Received: 24 November 2015
Accepted: 16 March 2016
Published: 24 March 2016
We retrospectively compared biochemical responses in type 1 Gaucher disease patients to treatment with glycosphingolipid synthesis inhibitors miglustat and eliglustat and ERT.
Seventeen GD1 patients were included (n = 6 eliglustat, (two switched from ERT), n = 9 miglustat (seven switchers), n = 4 ERT (median dose 60U/kg/m). Plasma protein markers reflecting disease burden (chitotriosidase, CCL18) and lipids reflecting substrate accumulation (glucosylsphingosine, glucosylceramide) were determined. Also, liver and spleen volumes, hemoglobin, platelets, and fat fraction were measured.
In patients naïve to treatment, chitotriosidase, CCL18 and glucosylsphingosine decreased comparably upon eliglustat and ERT treatment, while the response to miglustat was less. After 2 years, median decrease of chitotriosidase was 89 % (range 77–98), 88 % (78–92) and 37 % (29–46) for eliglustat, ERT and miglustat naïve patients respectively; decrease of CCL18 was 73 % (63–78), 54 % (43–86), and 10 % (3–18); decrease of glucosylsphingosine was 86 % (78–93), 78 % (65–91), 48 % (46–50). Plasma glucosylceramide in eliglustat treated patients (n = 4) reached values below the normal range (n = 20 healthy controls). Biochemical markers decreased or stabilized in switchers from ERT to eliglustat (n = 2), but less in miglustat switchers (n = 7). Clinical parameters responded comparably upon eliglustat and ERT treatment.
Our explorative study provides evidence that biochemical markers respond comparably in patients receiving eliglustat treatment and ERT, while the corresponding response to miglustat treatment is less.
KeywordsGaucher disease Eliglustat Miglustat Chitotriosidase Glucosylsphingosine Glucosylceramide Enzyme replacement therapy
Gaucher disease type I (GD1, OMIM230800) results from a deficiency of glucocerebrosidase (GBA1), a lysosomal enzyme responsible for the degradation of glucocerebroside (GlcCer) and glucosylsphingosine (GlcSph) [1, 2]. Subsequently, GlcCer and GlcSph accumulate, leading to the characteristic lipid laden macrophages, also known as Gaucher cells. These are thought to play a vital role in GD1’s pathophysiology, causing symptoms of hepatosplenomegaly, cytopenia and debilitating bone complications. Enzyme replacement therapy (ERT), currently the standard treatment of GD1, targets correction of these macrophages by intravenous administration of modified glucocerebrosidase. Three recombinant glucocerebrosidase products are approved for the treatment of GD1: imiglucerase (Genzyme a Sanofi Company), velaglucerase alpha (Shire Human Genetic Therapies) and taliglucerase alpha (Protalix Biotherapeutics). All demonstrate remarkable improvement of cytopenias and hepatosplenomegaly [3–8]. Nonetheless there are important limitations of ERT. Besides inconvenient infusions and exorbitant costs, there is increasing evidence that ERT cannot completely prevent bone complications . In particular patients with bone disease at start of therapy can experience despite treatment additional bone complications, although the frequency of such events seems reduced . It has been suggested that a systemic therapy targeting not only macrophages might be more beneficial, as aspects of GD’s symptomatology (malignancies, pulmonary hypertension, Parkinson’s disease and osteoporosis) are insufficiently explained by macrophage involvement solely .
Substrate reduction therapy (SRT), aiming to reduce accumulating glycosphingolipids by inhibiting their synthesis, might circumvent these disadvantages of ERT. Inhibitors of GlcCer synthesis to be used in SRT of GD1 are small compounds that can be taken orally and have the potential to rapidly diffuse into various tissues, including bones and the central nervous system. For GD1 presently inhibitors of the enzyme glucosylceramide synthase (GCS) have been developed. The first developed GCS inhibitor was miglustat (Actelion Pharmaceuticals Ltd.), which over a decade ago was approved for mild to moderately affected GD1 patients unsuitable to receive ERT. Significant improvements in hepatosplenomegaly and biochemical markers have been observed with miglustat treatment [12–14]. Although direct comparison with ERT has never been properly studied, the effects on key clinical parameters are less robust. Side effects such as gastrointestinal complaints (up to 80 %) and tremors in many cases have led to discontinuation of treatment. These side effects limit the use of miglustat for patients with GD [12, 13]. Although miglustat is able to cross the blood brain barrier in mouse models, effects on neurological outcomes in type III GD are controversial [15, 16]. Eliglustat tartrate (abbreviated to eliglustat, Genzyme a Sanofi Company) is a new GCS inhibitor with a stronger inhibitory potency than miglustat (IC50 value of 0.024 μM vs. 5–50 μM). Eliglustat does not cross the blood brain barrier. In contrast to miglustat, eliglustat does not potently inhibit intestinal glycosidases, thus largely preventing the gastro-intestinal symptoms observed with miglustat . Eliglustat has shown high promise as an oral treatment for GD1 given the observed clinically relevant effects on hematological and visceral symptoms [18–22].
In GD1, well established plasma markers reflecting disease burden have been described. Chitotriosidase (CHIT1 gene) and pulmonary and activation regulated chemokine (CCL18/PARC), both produced and secreted by macrophages, reflect to some extent the total burden of Gaucher cells [23, 24]. Chitotriosidase and CCL18 correlate with several clinical parameters [25, 26] and failures in correction of high levels of chitotriosidase are associated with the incidence of long term complications . The use of plasma chitotriosidase in monitoring of GD1 patients has limitations, because chitotriosidase activity is subject to genetic heterogeneity. Roughly 6 % of the population has no chitotriosidase activity due to a 24-bp duplication in the CHIT1 gene [27, 28]. More importantly a common G102S CHIT1 polymorphism renders misleading data of chitotriosidase protein levels when using the commercial substrate 4-methylumbelliferyl-chitotrioside as a substrate . This can be prevented using the novel 4-methylumbelliferyl-deoxychitobiosidase substrate [29, 30]. Even with the optimized 4-methylumbelliferyl-deoxychitobioside substrate the use of internal standards of recombinant chitotriosidase is warranted. Data produced by laboratories not using such internal controls should be interpreted with caution. In chitotriosidase-deficient GD patients CCL18 is frequently used to monitor GD1 disease. Little is known about intra-individual variations due to polymorphisms in the CCL18 gene. A more recent improvement is the use of plasma GlcSph as a marker of Gaucher cell burden. The sphingoid base is on average 200 fold elevated in GD1 patients . The main source of the elevated GlcSph in GD1are lipid-laden macrophages, but all GBA deficient cells in GD patients may produce GlcSph locally . In contrast to CCL18 and chitotriosidase, GlcSph is directly related to the primary molecular defect in GD1 patients. There is some evidence that GlcSph in GD1 is largely formed from intralysosomal GlcCer by deacylation [31–33]. Recent studies with conditional GD1 mouse models provide some evidence for the hypothesis that abnormalities in GlcSph contribute to GD1 symptomatology [11, 31, 32, 34, 35].
Until now a direct comparison of effects on biochemical markers reflecting disease burden between the aforementioned SRT and ERT treatment modalities has not been available. In this study, the effects on plasma markers of disease burden (chitotriosidase, CCL18, and GlcSph), plasma GlcCer associated to lipoproteins and clinical response (visceral, hematological and skeletal) are compared among eliglustat, miglustat and ERT treated patients.
All Dutch Gaucher patients treated with eliglustat and miglustat were eligible and included in this case series study. To compare clinical effects between treatment modalities, eliglustat treated patients (naïve to ERT therapy) were matched to ERT treated patients based on disease severity (absence of splenectomy and bone complications) and gender. Miglustat patients (naïve to ERT therapy) could not be matched due to small sample size. All ERT treated patients were receiving similar doses of ERT and had available fat fraction scores. Treatment failure was defined as published earlier . A diagnosis of Gaucher disease was confirmed by GBA genotyping and demonstration of deficient glucocerebrosidase activity in leucocytes. Clinical assessments consisted of hemoglobin levels, platelets count and abdominal Magnetic Resonance Imaging (MRI) to assess liver and spleen volumes. Bone marrow infiltration was assessed using Dixon Quantitative Chemical Shifting Imaging (QCSI) of the lumbar spine .
Baseline characteristics of included GD1 patients
Patient Gender Age start therapy [yr]
Mean dose ERT [U/kg/m] SRT [mg/day]
ERT before switch [yr]
Stop SRT/SRT duration [yr]
Anemia [g/dL] T0/TSwitch
Platelets [a109/L] T0/TSwitch
Spleen [mL] T0/TSwitch
Liver [mL] T0/TSwitch
FF [%] T0/TSwitch
1 M 59
2 M 42
3 M 43
4 F 37
5 M 47
6 M 45
7 M 42
8 F 46
9 F 44
10 F 43
11 M 37
12 M 36
13 M 43
14 M 47
15 F 32
16 F 65
17 F 12
18 F 30
19 F 23
A study protocol to obtain extra blood samples for patients treated with eliglustat was approved by the institutional review board of the Academic Medical Centre (AMC), Amsterdam, the Netherlands. Written informed consent was obtained from all participants. Data and samples of ERT and miglustat treated patients were gathered from the AMC biobank, for which all patients signed an informed consent. All investigations were conducted according to the declaration of Helsinki.
Biochemical plasma markers
Biochemical markers were measured in non-fasted plasma samples, stored at -20 °C. Chitotriosidase activity was measured using the 4MU-deoxychitobiosidase substrate, as described [28, 30], using a recombinant chitotriosidase as internal standard. All chitotriosidase values of patients heterozygous for the 24-bp duplication in the CHIT1 gene were multiplied by 2 [27, 28]. Plasma CCL18 was determined by ELISA as described previously .
Glycosphingolipids were extracted as previously described using the Bligh and Dyer method. Briefly, 500 μL CHCl3/MeOH was added to 25 μL of plasma, in a 2:3 ratio (v:v), and samples were centrifuged for 3 min at 16 000 g to remove protein precipitate. Subsequently, 100 μL CHCl3 and 255 μL 100 mM formate buffer pH 3.15 was added for phase separation. After vortexing and centrifugation for 3 min at 16 000 g, the upper organic phase was collected, and lower phase re-extracted with 300 μL MeOH and 270 μL formate buffer. Pooled upper phases were desiccated in a heat block set at (37 °C) using mild N2 flow. Dried samples were redissolved in 100 μL MeOH and glucosylsphingosine was analysed by LC-ESI-MS/MS using 13C5-GlcSph as internal control  Ceramide and glucosylceramide were determined in the lower phase by HPLC as described in reference  using C17 sphinganine as an Internal Standard (Avanti Polar Lipids, Alabama, USA).
For statistical calculations and data collection, SPSS version 20 was used (SPSS Inc. Chicago, IL). Graphs were made in GraphPad Prism version 6. For descriptive data, medians and ranges were used. Statistical tests to compare effects between groups were not performed due to small sample size.
Of the included patients six were treated with eliglustat: four were naïve to treatment (‘naïve patients’) and two had been treated with ERT for 18 or more years (‘switch patients’). One switch patient (Table 1, no. 12), severely affected at initiation of ERT (multiple disabling bone complications, splenectomy), interrupted eliglustat treatment after 17 weeks because of an AE possibly related to eliglustat use (data reported to Genzyme a Sanofi Company). Nine miglustat treated patients were included of whom two were naïve to treatment. Seven patients switched from ERT to miglustat: three because of a worldwide imiglucerase shortage (no. 15, 16, 17), three because they preferred an oral treatment and were clinically stable on ERT (no. 13, 14, 18), and one because of treatment failure on imiglucerase due to development of neutralizing antibodies (no. 19, depicted in graphs with a blue star), earlier described in an abstract and case report [39, 40]. Two patients interrupted treatment because of tremors and three because of treatment failure (described more in detail below). The four patients treated with eliglustat and naïve to ERT were matched to four ERT treated patients (see method section and Table 1), receiving a median dose of 60 U/kg/month (range 45–60) albeit with different enzyme preparations (velaglucerase or imiglucerase).
Chitotriosidase, CCL18 and GlcSph in patients naïve to treatment
Median percent decrease (range) of biochemical markers in treatment naïve patients
n = 4
n = 4
n = 2
Chitotriosidase, CCL18 and GlcSph in patients switching from ERT to SRT
Plasma GlcCer and Ceramide in patients naïve and patients switching from ERT to SRT
To compare the inhibitory response of eliglustat and miglustat on GlcCer synthesis at cellular level, tissue biopsies would have been essential. Because these were not available we investigated plasma GlcCer levels, mostly reflecting hepatic GlcCer synthesis bound to lipoproteins, and spill-over of accumulated GlcCer. Plasma GlcCer levels decreased rapidly below lower limit of normal (of n = 20 healthy control subjects), both in naïve and switchers treated with eliglustat (Figs. 1j and 2d). Decreases were observed already after two weeks of treatment (data not shown). Such rapid decline of plasma GlcCer and GlcSph was not observed in any of the miglustat treated patients. Of note, we observed an unexpected transient increase of GlcCer and GlcSph in 5/6 patients in samples taken 4 h after their first dose of eliglustat (data not shown). Whether this unexplained effect is specific to eliglustat could not be investigated as short term samples were not available from ERT and miglustat treated patients. In contrast, in most miglustat treated patients, especially those who switched from ERT (5/7), plasma GlcCer increased to supra-normal levels. Upon ERT treatment plasma GlcCer levels decreased in all, but normalized in 3/4 patients treated with ERT only, and normalized in 2/7 switch patients just before they switched to miglustat.
Plasma ceramide levels did not increase upon different treatment modalities in naïve or switch patients: T0 eliglustat 6.6–12.8 nmol/mL, ERT 8.0–15.0 nmol/mL, miglustat 6.6–10.6 nmol/mL (normal reference range: 5.1–18.8 nmol/mL) versus after two years of treatment T2yr eliglustat 7.6–12.8 nmol/mL, ERT 8.0–10.0 nmol/mL, miglustat 4.8–10.1 nmol/mL.
Of the two switch patients, one (no. 12) was a severely affected patient with splenectomy and multiple bone complications prior to initiation of ERT. Twenty-two years of ERT had resulted in a normal liver volume, but residual bone disease with high plasma chitotriosidase levels. He interrupted treatment with eliglustat after 17 weeks due to an AE. All clinical GD parameters remained stable, but the period of observation was too short to draw any conclusions. Patient 11, mildly affected at start of ERT, had stable spleen and liver volumes, platelets counts and hemoglobin levels, which were all normal when eliglustat was initiated and remained stable.
Miglustat patients had variable disease severity at initiation of ERT. Of the two patients treated with miglustat and naïve to ERT, one splenectomized patient with bone complications (no. 10), showed a gradual decline of liver volume, comparable to ERT and eliglustat patients (Fig. 3a). After 15 years of treatment this patient kept borderline anemia (Hb levels T0 10.9 to T15 10.9 g/dL) without other causes for her anemia than GD1. The non-splenectomized patient had a decline in organomegaly, which was similar to effects seen with ERT and eliglustat during the follow-up of two years. Evaluation after 15 years of treatment showed stabilization with moderate thrombocytopenia (100 × 109/L) and splenomegaly (406 mL, 3 times multiple of normal). Fat fractions increased in both patients (Fig. 3i).
Of the seven patients switching to miglustat two remained clinically stable (no. 13 and 14). Two patients discontinued treatment shortly after initiation of miglustat due to AEs and three patients discontinued due to treatment failure (see Table 1). The first had an increase of spleen volume and a decrease of fat fraction, while the second had an increase of liver volume and decrease of fat fraction The third case (patient 19) was switched to miglustat due to disease progression as the consequence of neutralizing antibodies to imiglucerase. She further deteriorated on miglustat treatment with an increase of liver volume, development of severe thrombocytopenia and a bone complication with very low fat fraction (see blue star * in Figs. 2, 3). In all patients who had a treatment failure, the biochemical markers chitotriosidase and CCL18 worsened upon start of miglustat treatment.
Our investigation with a limited number of naïve GD1 patients suggests that the response to eliglustat treatment with respect to established biomarkers of disease burden (chitotriosidase and CCL18) is on a par with that of moderate doses of ERT. In contrast, the same biomarkers respond less favorably to miglustat treatment. These findings are in agreement with literature reports. Mistry et al demonstrated that after 9 months of eliglustat treatment in naïve GD1 patients chitotriosidase decreased with a mean of 44 % . Lukina demonstrated a median decrease of CCL18 of 50 % , while in naïve GD1 patients treated with miglustat mean decreases of chitotriosidase after one year were less pronounced, ranging from 6 to 17 % [12, 41–44], median 5–13 % (median values were not given, but could be calculated from references [12, 42]).
Next, our investigation showed that seventy percent of patients switching from ERT to miglustat demonstrated an increase of plasma chitotriosidase levels. The prevalence of such deterioration is higher than reported in literature, where increases are described in 4–43 % of cases [13, 44–46]. The small number of patients investigated might explain this disparity. There may also be bias in studies due to high drop-out rates by AE’s and treatment failure. In addition, the outcome of the switch from ERT to miglustat may be influenced by specific reasons, for instance the severely affected patient no 19 in our investigation had to switch due to antibody development towards imiglucerase. Since increases of plasma chitotriosidase are not always directly accompanied by prominent clinical deterioration , the value of chitotriosidase measurements to monitor GD1 patients deserves discussion. Recently van Dussen et al demonstrated that patients with sustained chitotriosidase increases ≥ 30 % are at risk of having clinical deterioration with a relative risk of 6.3 (CI 95 % 2.2–17.8): chitotriosidase increases are accompanied by clinical deterioration in 50 % of patients, whereas when chitotriosidase is stable, 8 % develop clinical deterioration . Sustained increases of chitotriosidase after switch from ERT to miglustat reflect an increase of Gaucher cell burden and risk for clinical deterioration or new complications, which should therefore be avoided. In addition, van Dussen showed that high residual chitotriosidase activity after two years of treatment correlates to long term complications. Although limited patients switching from ERT to eliglustat were available in this study, it is reassuring that even after ±3 months of therapy in a severely affected GD1 patient with high residual chitotriosidase activity after 20 years of ERT, eliglustat was able to decrease chitotriosidase and CCL18 levels. Even more promising is the noted transient reduction in plasma GlcSph in this patient. This anecdotal finding suggests that eliglustat might be capable in some GD1 patients to reach Gaucher cells that are not responsive to ERT. Our investigation documents for the first time that elevated plasma GlcSph is comparably decreased by eliglustat and ERT in naïve GD1 patients. The two investigated patients who switch from ERT to eliglustat treatment showed a further reduction of plasma GlcSph levels. On the other hand, miglustat treatment of naïve GD1 patients led to only minor reductions and switching patients from ERT to miglustat tended to be associated with stable or increasing plasma GlcSph. The clinical implications of the elevated plasma GlcSph are yet unclear, like those of elevated plasma GlcCer. From the single study that addressed associations with clinical symptoms, it can be concluded that it could be seen as a general marker for disease burden in GD1 , but does not correlate to specific symptoms. In contrast to chitotriosidase, which is not pathogenic but a mere reflection of alternatively activated macrophages, it has been hypothesized that GlcSph as a toxic compound is directly implicated in GD1 pathology. Studies of Orvinsky and Nilson revealed that GlcSph levels were normal in a brain of a GD I patient, but elevated in GD III and highest in brains of GD II patients with the most severe cerebral involvement [47, 48]. In vitro studies suggest neurotoxicity of GlcSph . In addition, GlcSph has been shown to cause hemolysis and to inhibit protein kinase C, a pivotal kinase in signal transduction and cell behavior . Extrapolation of such in vitro findings with high concentrations of GlcSph to pathophysiological action in GD patients warrants care. Further circumstantial evidence of a toxic effect of GlcSph in GD1 has been offered by Mistry et al demonstrating that high levels of GlcSph impair osteoblastogenesis in cultured osteoblasts of a conditional mouse GD1 model demonstrating very low bone mineral density . More recently, Pavlova et al suggested that GlcSph is oncogenic, based on the association of high GlcSph levels in a conditional mouse model with a high incidence of B-cell lymphoma [34, 35]. If further research substantiates that GlcSph contributes to the pathogenesis of GD1, ERT treated patients with remaining high levels of GlcSph might potentially benefit from eliglustat treatment.
Of note, our study confirms that eliglustat is a very potent inhibitor of GCS in humans. Whereas with miglustat plasma GlcCer normalized or increased, eliglustat dramatically decreased circulating GlcCer bound to lipoprotein in all eliglustat patients, even to levels 50 % below normal as determined for 20 healthy subjects. However, it is essential to analyze a much larger number of presumed normal subjects to establish the lowest limit of the normal population range.
Due to limited sample size our study is insufficient to draw definite conclusions whether ERT and eliglustat are on a par in clinical efficacy. Nonetheless, our data for the matched patients indicate that eliglustat is not inferior to moderate dose of ERT: an equal decline of liver and spleen volumes, and equal rise of platelets and fat fraction was observed. Extended comparative data on both treatment modalities are now essential to determine the optimal clinical strategy for naïve GD1 patients. Such data are not actively pursued. The presently conducted RCTs by Genzyme do not directly compare ERT to eliglustat treatment of naïve GD1 patients. Instead, eliglustat treatment is compared to placebo . Safety of switching from ERT to eliglustat treatment is separately investigated . The RCT comparing placebo to eliglustat, including mild to moderately affected patients (severe patients with bone disease and splenectomies were excluded), demonstrates clinically relevant responses on cytopenia and hepatosplenomegaly . Results of the ENCORE trial  demonstrate that 85 % (84/99) of the eliglustat treated GD1 patients (pretreated with ERT) and 94 % (44/47) of imiglucerase treated patients maintained therapeutic goals. Eliglustat treatment was statistically non-inferior to imiglucerase treatment as the lower bound of the 95 % confidence interval difference was within pre-specified non-inferiority thresholds (-17.6 %).
Potential advantages of present and future SRT modalities are thought to be better prevention of bone complications due to drug delivery in the bone compartments. In our naïve GD patients, bone marrow infiltration (fat fraction) improved upon eliglustat therapy, and none developed bone complications during the study period. With the available limited clinical data is not possible to draw conclusions on superiority of eliglustat treatment over ERT regarding bone complications. It will be also of interest to learn how eliglustat treatment impacts the occurrence of long-term complications and associated conditions in GD1 such as cancer, pulmonary hypertension, metabolic alterations including insulin resistance as well as Parkinson’s disease [50–52].
Our exploratory investigation with a small number of GD1 patients has indicated that response in biomarkers of disease burden is on a par in naïve patients receiving eliglustat treatment and those receiving moderate doses of ERT, the same biomarkers responded less to miglustat treatment in (very limited sample size). Clinical response in the compared ERT and eliglustat treated naive GD patients seemed also comparable. Our present biochemistry and clinical findings should be extended by studies with larger cohorts.
We would like to thank all participating patients and Maaike Wiersma for her assistance in the collection of samples.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
- Brady RO, Kanfer JN, Shapiro D. Metabolism of glucocerebrosides II. Evidence of an enzymatic deficiency in Gaucher disease. Biochem Biophys Res Commun. 1965;18:221–5.View ArticlePubMedGoogle Scholar
- Dekker N, Voorn-Brouwer T, Verhoek M, Wennekes T, Narayan RS, Speijer D, et al. The cytosolic beta-glucosidase GBA3 does not influence type 1 Gaucher disease manifestation. Blood Cells Mol Dis. 2011;46(1):19–26.View ArticlePubMedGoogle Scholar
- Barton NW, Furbish FS, Murray GJ, Garfield M, Brady RO. Therapeutic response to intravenous infusions of glucocerebrosidase in a patient with Gaucher disease. Proc Natl Acad Sci U S A. 1990;87(5):1913–6.View ArticlePubMedPubMed CentralGoogle Scholar
- Beutler E, Kay A, Saven A, Garver P, Thurston D, Dawson A, et al. Enzyme replacement therapy for Gaucher disease. Blood. 1991;78(5):1183–9.PubMedGoogle Scholar
- Grabowski GA, Barton NW, Pastores G, Dambrosia JM, Banerjee TK, McKee MA, et al. Enzyme therapy in type 1 Gaucher disease: comparative efficacy of mannose-terminated glucocerebrosidase from natural and recombinant sources. Ann Intern Med. 1995;122(1):33–9.View ArticlePubMedGoogle Scholar
- Gonzalez DE, Turkia HB, Lukina EA, Kisinovsky I, Dridi MF, Elstein D, et al. Enzyme replacement therapy with velaglucerase alfa in Gaucher disease: results from a randomized, double-blind, multinational, phase 3 study. Am J Hematol. 2013;88(3):166–71.View ArticlePubMedGoogle Scholar
- Zimran A, Altarescu G, Phillips M, Attias D, Jmoudiak M, Deeb M, et al. Phase I/II and extension study of velaglucerase alfa replacement therapy in adults with type 1 Gaucher disease: 48-month experience. Blood. 2010;115(23):4651–46.View ArticlePubMedGoogle Scholar
- Zimran A, Brill-Almon E, Chertkoff R, Petakov M, Blanco-Favela F, Munoz ET, et al. Pivotal trial with plant cell-expressed recombinant glucocerebrosidase, taliglucerase alfa, a novel enzyme replacement therapy for Gaucher disease. Blood. 2011;118(22):5767–73.View ArticlePubMedGoogle Scholar
- van Dussen L, Biegstraaten M, Dijkgraaf M, Hollak C. Modelling Gaucher disease progression: long-term enzyme replacement therapy reduces the incidence of splenectomy and bone complications. Orphanet J Rare Dis. 2014;9(1):112.View ArticlePubMedPubMed CentralGoogle Scholar
- Md F, van Noesel CJ, Aerts JM, Maas M, Poll RG, Hollak CE. Persistent bone disease in adult type 1 Gaucher disease despite increasing doses of enzyme replacement therapy. Haematologica. 2008;93(7):1119–20.View ArticleGoogle Scholar
- Mistry PK, Liu J, Yang M, Nottoli T, McGrath J, Jain D, et al. Glucocerebrosidase gene-deficient mouse recapitulates Gaucher disease displaying cellular and molecular dysregulation beyond the macrophage. Proc Natl Acad Sci U S A. 2010;107(45):19473–8.View ArticlePubMedPubMed CentralGoogle Scholar
- Cox T, Lachmann R, Hollak C, Aerts J, van Weely S, Hrebicek M, et al. Novel oral treatment of Gaucher’s disease with N-butyldeoxynojirimycin (OGT 918) to decrease substrate biosynthesis. Lancet. 2000;355(9214):1481–5.View ArticlePubMedGoogle Scholar
- Cox TM, Amato D, Hollak CE, Luzy C, Silkey M, Giorgino R, et al. Evaluation of miglustat as maintenance therapy after enzyme therapy in adults with stable type 1 Gaucher disease: a prospective, open-label non-inferiority study. Orphanet J Rare Dis. 2012;7:102.View ArticlePubMedPubMed CentralGoogle Scholar
- Brand M, Muller A, Alsop J, van Schaik IN, Bembi B, Hughes D. Results from a 9-year Intensive Safety Surveillance Scheme (IS3) in miglustat (Zavesca(®))-treated patients. Pharmacoepidemiol Drug Saf. 2015;24(3):329–33.View ArticlePubMedGoogle Scholar
- Schiffmann R, Fitzgibbon EJ, Harris C, DeVile C, Davies EH, Abel L, et al. Randomized, controlled trial of miglustat in Gaucher’s disease type 3. Ann Neurol. 2008;64(5):514–22.View ArticlePubMedPubMed CentralGoogle Scholar
- Cox-Brinkman J, van Breemen MJ, van Maldegem BT, Bour L, Donker WE, Hollak CE, et al. Potential efficacy of enzyme replacement and substrate reduction therapy in three siblings with Gaucher disease type III. J Inherit Metab Dis. 2008;31(6):745–52.View ArticlePubMedGoogle Scholar
- McEachern KA, Fung J, Komarnitsky S, Siegel CS, Chuang WL, Hutto E, et al. A specific and potent inhibitor of glucosylceramide synthase for substrate inhibition therapy of Gaucher disease. Mol Genet Metab. 2007;91(3):259–67.View ArticlePubMedGoogle Scholar
- Lukina E, Watman N, Arreguin EA, Dragosky M, Iastrebner M, Rosenbaum H, et al. Improvement in hematological, visceral, and skeletal manifestations of Gaucher disease type 1 with oral eliglustat tartrate (Genz-112638) treatment: 2-year results of a phase 2 study. Blood. 2010;116(20):4095–8.View ArticlePubMedPubMed CentralGoogle Scholar
- Lukina E, Watman N, Arreguin EA, Banikazemi M, Dragosky M, Iastrebner M, et al. A Phase 2 study of eliglustat tartrate (Genz-112638), an oral substrate reduction therapy for Gaucher disease type 1. Blood. 2010;116(6):893–9.View ArticlePubMedPubMed CentralGoogle Scholar
- Smid BE, Hollak CE. A systematic review on effectiveness and safety of eliglustat for type 1 Gaucher disease. Expert Opinionon Orphan Drugs. 2014;2(5):523–9.View ArticleGoogle Scholar
- Mistry PK, Lukina E, Ben TH, Amato D, Baris H, Dasouki M, et al. Effect of oral eliglustat on splenomegaly in patients with gaucher disease type 1: The engage randomized clinical trial. JAMA. 2015;313(7):695–706.View ArticlePubMedGoogle Scholar
- Cox TM, Drelichman G, Cravo R, Balwani M, Burrow TA, Martins A, et al. Eliglustat compared with imiglucerase in patients with Gaucher’s disease type 1 stabilised on enzyme replacement therapy: a phase 3, randomised, open-label, non-inferiority trial. Lancet. 2015;385(9985):2355–62.View ArticlePubMedGoogle Scholar
- Boot RG, Verhoek M, de Fost M, Hollak CE, Maas M, Bleijlevens B, et al. Marked elevation of the chemokine CCL18/PARC in Gaucher disease: a novel surrogate marker for assessing therapeutic intervention. Blood. 2004;103(1):33–9.View ArticlePubMedGoogle Scholar
- Hollak CE, van Weely S, van Oers MH, Aerts JM. Marked elevation of plasma chitotriosidase activity. A novel hallmark of Gaucher disease. J Clin Invest. 1994;93(3):1288–92.View ArticlePubMedPubMed CentralGoogle Scholar
- Deegan PB, Moran MT, McFarlane I, Schofield JP, Boot RG, Aerts JM, et al. Clinical evaluation of chemokine and enzymatic biomarkers of Gaucher disease. Blood Cells Mol Dis. 2005;35(2):259–67.View ArticlePubMedGoogle Scholar
- van Dussen L, Hendriks EJ, Groener JEM, Boot RG, Hollak CEM, Aerts JMFG. Value of plasma chitotriosidase to assess non-neuronopathic Gaucher disease severity and progression in the era of enzyme replacement therapy. J Inherit Metab Dis. 2014;37(6):991–1001.View ArticlePubMedGoogle Scholar
- Boot RG, Renkema GH, Verhoek M, Strijland A, Bliek J, de Meulemeester TM, et al. The human chitotriosidase gene: Nature of inherited enzyme deficiency. J Biol Chem. 1998;273(40):25680–5.View ArticlePubMedGoogle Scholar
- Schoonhoven A, Rudensky B, Elstein D, Zimran A, Hollak CE, Groener JE, et al. Monitoring of Gaucher patients with a novel chitotriosidase assay. Clin Chim Acta. 2007;381(2):136–9.View ArticlePubMedGoogle Scholar
- Bussink AP, Verhoek M, Vreede J, Ghauharali-van der Vlugt K, Donker-Koopman WE, et al. Common G102S polymorphism in chitotriosidase differentially affects activity towards 4-methylumbelliferyl substrates. FEBS J. 2009;276(19):5678–88.View ArticlePubMedGoogle Scholar
- Aguilera B, Ghauharali-vanderVlugt K, Helmond MT, Out JM, Donker-Koopman WE, Groener JE, et al. Transglycosidase activity of chitotriosidase: improved enzymatic assay for the human macrophage chitinase. J Biol Chem. 2003;278(42):40911–6.View ArticlePubMedGoogle Scholar
- Dekker N, van Dussen L, Hollak CE, Overkleeft H, Scheij S, Ghauharali K, et al. Elevated plasma glucosylsphingosine in Gaucher disease: relation to phenotype, storage cell markers, and therapeutic response. Blood. 2011;118(16):e118–27.View ArticlePubMedPubMed CentralGoogle Scholar
- Ferraz MJ, Kallemeijn WW, Mirzaian M, Herrera Moro D, Marques A, Wisse P, et al. Gaucher disease and Fabry disease: new markers and insights in pathophysiology for two distinct glycosphingolipidoses. Biochim Biophys Acta. 2014;1841(5):811–25.View ArticlePubMedGoogle Scholar
- Yamaguchi Y, Sasagasako N, Goto I, Kobayashi T. The synthetic pathway for glucosylsphingosine in cultured fibroblasts. J Biochem. 1994;116(3):704–10.PubMedGoogle Scholar
- Pavlova EV, Archer J, Wang S, Dekker N, Aerts JM, Karlsson S, et al. Inhibition of UDP-glucosylceramide synthase in mice prevents Gaucher disease-associated B-cell malignancy. J Pathol. 2015;235(1):113–24.View ArticlePubMedGoogle Scholar
- Pavlova EV, Wang SZ, Archer J, Dekker N, Aerts JM, Karlsson S, et al. B cell lymphoma and myeloma in murine Gaucher’s disease. J Pathol. 2013;231(1):88–97.View ArticlePubMedGoogle Scholar
- Maas M, Hollak CE, Akkerman EM, Aerts JM, Stoker J, den Heeten GJ. Quantification of skeletal involvement in adults with type I Gaucher’s disease: fat fraction measured by Dixon quantitative chemical shift imaging as a valid parameter. Am J Roentgenol. 2002;179(4):961–5.View ArticleGoogle Scholar
- Mirzaian M, Wisse P, Ferraz MJ, Gold H, Donker-Koopman WE, Verhoek M, et al. Mass spectrometric quantification of glucosylsphingosine in plasma and urine of type 1 Gaucher patients using an isotope standard. Blood Cells Mol Dis. 2015;54(4):307–14.View ArticlePubMedGoogle Scholar
- Groener JE, Poorthuis BJ, Kuiper S, Helmond MT, Hollak CE, Aerts JM. HPLC for simultaneous quantification of total ceramide, glucosylceramide, and ceramide trihexoside concentrations in plasma. Clin Chem. 2007;53(4):742–7.View ArticlePubMedGoogle Scholar
- Hollak CEM, Donker-Koopman W, Groener JA, Berge tIJM, Oers vMH, Aerts JMFG. Progressive Gaucher disease due to neutralizing anti-imiglucerase antibodies: successful treatment with Rituximab (anti-CD20) followed by high dose imiglucerase. ESGLD conference, Bad Honnef. 2009.Google Scholar
- Biegstraaten M, van Schaik IN, Aerts JM, Langeveld M, Mannens MM, Bour LJ, et al. A monozygotic twin pair with highly discordant Gaucher phenotypes. Blood Cells Mol Dis. 2011;46(1):39–41.View ArticlePubMedPubMed CentralGoogle Scholar
- Elstein D, Hollak C, Aerts JM, van Weely S, Maas M, Cox TM, et al. Sustained therapeutic effects of oral miglustat (Zavesca, N-butyldeoxynojirimycin, OGT 918) in type I Gaucher disease. J Inherit Metab Dis. 2004;27(6):757–66.View ArticlePubMedGoogle Scholar
- Heitner R, Elstein D, Aerts J, Weely S, Zimran A. Low-dose N-butyldeoxynojirimycin (OGT 918) for type I Gaucher disease. Blood Cells Mol Dis. 2002;28(2):127–33.View ArticlePubMedGoogle Scholar
- Giraldo P, Latre P, Alfonso P, Acedo A, Alonso D, Barez A, et al. Short-term effect of miglustat in every day clinical use in treatment-naive or previously treated patients with type 1 Gaucher’s disease. Haematologica. 2006;91(5):703–6.PubMedGoogle Scholar
- Kuter DJ, Mehta A, Hollak CE, Giraldo P, Hughes D, Belmatoug N, et al. Miglustat therapy in type 1 Gaucher disease: clinical and safety outcomes in a multicenter retrospective cohort study. Blood Cells Mol Dis. 2013;51(2):116–24.View ArticlePubMedGoogle Scholar
- Giraldo P, Alfonso P, Atutxa K, Fernandez-Galan MA, Barez A, Franco R, et al. Real-world clinical experience with long-term miglustat maintenance therapy in type 1 Gaucher disease: the ZAGAL project. Haematologica. 2009;94(12):1771–5.View ArticlePubMedPubMed CentralGoogle Scholar
- Elstein D, Dweck A, Attias D, Hadas-Halpern I, Zevin S, Altarescu G, et al. Oral maintenance clinical trial with miglustat for type I Gaucher disease: switch from or combination with intravenous enzyme replacement. Blood. 2007;110(7):2296–301.View ArticlePubMedGoogle Scholar
- Orvisky E, Park JK, Lamarca ME, Ginns EI, Martin BM, Tayebi N, et al. Glucosylsphingosine accumulation in tissues from patients with Gaucher disease: correlation with phenotype and genotype. Mol Genet Metab. 2002;76(4):262–70.View ArticlePubMedGoogle Scholar
- Nilsson O, Svennerholm L. Accumulation of glucosylceramide and glucosylsphingosine (psychosine) in cerebrum and cerebellum in infantile and juvenile Gaucher disease. J Neurochem. 1982;39(3):709–18.View ArticlePubMedGoogle Scholar
- Schueler UH, Kolter T, Kaneski CR, Blusztajn JK, Herkenham M, Sandhoff K, et al. Toxicity of glucosylsphingosine (glucopsychosine) to cultured neuronal cells: a model system for assessing neuronal damage in Gaucher disease type 2 and 3. Neurobiol Dis. 2003;14(3):595–601.View ArticlePubMedGoogle Scholar
- Arends M, van Dussen L, Biegstraaten M, Hollak CE. Malignancies and monoclonal gammopathy in Gaucher disease; a systematic review of the literature. Br J Haematol. 2013;161(6):832–42.View ArticlePubMedGoogle Scholar
- Langeveld M, Ghauharali KJ, Sauerwein HP, Ackermans MT, Groener JE, Hollak CE, et al. Type I Gaucher disease, a glycosphingolipid storage disorder, is associated with insulin resistance. J Clin Endocrinol Metab. 2008;93(3):845–51.View ArticlePubMedGoogle Scholar
- Neudorfer O, Giladi N, Elstein D, Abrahamov A, Turezkite T, Aghai E, et al. Occurrence of Parkinson’s syndrome in type I Gaucher disease. QJM. 1996;89(9):691–4.View ArticlePubMedGoogle Scholar
- van Dussen L, Akkerman EM, Hollak CE, Nederveen AJ, Maas M. Evaluation of an imaging biomarker, Dixon quantitative chemical shift imaging, in Gaucher disease: lessons learned. J Inherit Metab Dis. 2014;37(6):1003–11.View ArticlePubMedGoogle Scholar