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Beta-glucosidase 1 (GBA1) is a second bile acid ?-glucosidase in addition to ?-glucosidase 2 (GBA2). Study in ?-glucosidase deficient mice and humans.

ABSTRACT: Beta-glucosidase 1 (GBA1; lysosomal glucocerebrosidase) and ?-glucosidase 2 (GBA2, non-lysosomal glucocerebrosidase) both have glucosylceramide as a main natural substrate. The enzyme-deficient conditions with glucosylceramide accumulation are Gaucher disease (GBA-/- in humans), modelled by the Gba-/- mouse, and the syndrome with male infertility in the Gba2-/- mouse, respectively. Before the leading role of glucosylceramide was recognised for both deficient conditions, bile acid-3-O-?-glucoside (BG), another natural substrate, was viewed as the main substrate of GBA2. Given that GBA2 hydrolyses both BG and glucosylceramide, it was asked whether vice versa GBA1 hydrolyses both glucosylceramide and BG. Here we show that GBA1 also hydrolyses BG. We compared the residual BG hydrolysing activities in the GBA1-/-, Gba1-/- conditions (where GBA2 is the almost only active ?-glucosidase) and those in the Gba2-/- condition (GBA1 active), with wild-type activities, but we used also the GBA1 inhibitor isofagomine. GBA1 and GBA2 activities had characteristic differences between the studied fibroblast, liver and brain samples. Independently, the hydrolysis of BG by pure recombinant GBA1 was shown. The fact that both GBA1 and GBA2 are glucocerebrosidases as well as bile acid ?-glucosidases raises the question, why lysosomal accumulation of glucosylceramide in GBA1 deficiency, and extra-lysosomal accumulation in GBA2 deficiency, are not associated with an accumulation of BG in either condition.

SUBMITTER: Harzer K

PROVIDER: S-EPMC3529407 | biostudies-literature | 2012 Jun

REPOSITORIES: biostudies-literature

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Beta-glucosidase 1 (GBA1) is a second bile acid β-glucosidase in addition to β-glucosidase 2 (GBA2). Study in β-glucosidase deficient mice and humans.

Harzer Klaus K Blech-Hermoni Yotam Y Goldin Ehud E Felderhoff-Mueser Ursula U Igney Claudia C Sidransky Ellen E Yildiz Yildiz Y

Biochemical and biophysical research communications 20120530 2

Beta-glucosidase 1 (GBA1; lysosomal glucocerebrosidase) and β-glucosidase 2 (GBA2, non-lysosomal glucocerebrosidase) both have glucosylceramide as a main natural substrate. The enzyme-deficient conditions with glucosylceramide accumulation are Gaucher disease (GBA-/- in humans), modelled by the Gba-/- mouse, and the syndrome with male infertility in the Gba2-/- mouse, respectively. Before the leading role of glucosylceramide was recognised for both deficient conditions, bile acid-3-O-β-glucoside ...[more]

PMID: 22659419

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Project description:Aims/hypothesisBile-acid (BA) signalling is crucial in metabolism homeostasis and has recently been found to mediate the therapeutic effects of glucose-lowering treatments, including α-glucosidase inhibitor (AGI). However, the underlying mechanisms are yet to be clarified. We hypothesised that BA signalling may be required for the glucose-lowering effects and metabolic benefits of AGI.MethodsLeptin receptor (Lepr)-knockout (KO) db/db mice and high-fat high-sucrose (HFHS)-fed Fxr (also known as Nr1h4)-KO mice were treated with AGI. Metabolic phenotypes and BA signalling in different compartments, including the liver, gut and endocrine pancreas, were evaluated. BA pool profiles were analysed by mass spectrometry. The islet transcription profile was assayed by RNA sequencing. The gut microbiome were assayed by 16S ribosomal RNA gene sequencing.ResultsAGI lowered microbial BA levels in BA pools of different compartments in the body, and increased gut BA reabsorption in both db/db and HFHS-fed mouse models via altering the gut microbiome. The AGI-induced changes in BA signalling (including increased activation of farnesoid X receptor [FXR] in the liver and inhibition of FXR in the ileum) echoed the alterations in BA pool size and composition in different organs. In Fxr-KO mice, the glucose- and lipid-lowering effects of AGI were partially abrogated, possibly due to the Fxr-dependent effects of AGI on decelerating beta cell replication, alleviating insulin hypersecretion and improving hepatic lipid and glucose metabolism.Conclusions/interpretationBy regulating microbial BA metabolism, AGI elicited diverse changes in BA pool composition in different host compartments to orchestrate BA signalling in the whole body. The AGI-induced changes in BA signalling may be partly required for its glucose-lowering effects. Our study, hence, sheds light on the promising potential of regulating microbial BA and host FXR signalling for the treatment of type 2 diabetes.Data availabilitySequencing data are available from the BioProject Database (accession no. PRJNA600345; www.ncbi.nlm.nih.gov/bioproject/600345).

Dataset Information

Beta-glucosidase 1 (GBA1) is a second bile acid ?-glucosidase in addition to ?-glucosidase 2 (GBA2). Study in ?-glucosidase deficient mice and humans.

Publications

Beta-glucosidase 1 (GBA1) is a second bile acid β-glucosidase in addition to β-glucosidase 2 (GBA2). Study in β-glucosidase deficient mice and humans.

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