Increases in plasma lysosomal enzymes in type 1 (insulin-dependent) diabetes mellitus: Relationship to diabetic complications and glycaemic control
Open accessAbstract
Lysosomal enzymes degrade membrane glycoconjugates, and increased circulating enzyme activity may be an important mechanism in the pathogenesis of diabetic microangiopathy. We have assayed a profile of seven lysosomal enzyme activities (nmol.h-1.ml-1) in platelet-free plasma from 54 Type 1 (insulin-dependent) diabetic subjects (median age 31 years) and 42 matched normal control subjects. A significant increase in median (interquartile range) enzyme activity was measured in diabetic compared to control subjects for beta-D-glucuronidase, 121 (97.7-171) vs 88.8 (62.8-113), p less than 0.001; beta-D-Nacetylglucosaminidase, 693 (568-799) vs 568 (462-686), p less than 0.001; alpha-D-mannosidase, 23.8 (16.7-28.9) vs 14.5 (10.1-20.0), p less than 0.001; and beta-D-galactosidase, 6.94 (6.11-9.99) vs 6.66 (4.78-8.33), p less than 0.04. In contrast, alpha-L-fucosidase, alpha-D-galactosidase and beta-D-mannosidase activities were similar in diabetic and control subjects. None of the enzyme activities differed significantly (p less than 0.05) between 24 diabetic patients with clinical complications and 30 complication-free diabetic patients with similar glycaemic control which does not support the hypothesis that enzyme increases in diabetes arise simply by leakage from damaged tissues. In the diabetic subjects HbA1, median (interquartile range) 9.10 (7.40-10.60), was significantly related to beta-D-glucuronidase (rs = 0.56, p less than 0.001) and beta-D-Nacetylglucosaminidase (rs = 0.55, p less than 0.001). We have therefore demonstrated in diabetic subjects an increase in certain lysosomal glycosidases, that correlates with glycaemic control.(ABSTRACT TRUNCATED AT 250 WORDS)
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In flies and humans, changes in expression and activity levels of α-mannosidases have been linked to impairments in insulin signaling and glucose metabolism.
“In both flies and humans, changes in expression and activity levels of α-mannosidases have been linked to impairments in insulin signaling and glucose metabolism (66–70).”
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- Authors
- Waters, P. J., Flynn, M. D., Corrall, R. J. M., & Pennock, C. A.
- Affiliations
- St Michael's Hospital (GB)
- Bristol Royal Infirmary (GB)
- ORCID
- Waters, P. J.
- Venue
- Diabetologia
- Published
- 1992-10
- Volume
- 35
- Issue
- 10
- Pages
- 991-995
- ISSN
- 0012-186X (ISSN-L)
- 1432-0428
- OpenAlex
- W1964400878
- Cited by
- 21
- References
- 22
- Citations by year
- 2020: 1 · 2019: 1 · 2017: 2 · 2016: 1 · 2013: 1 · 2012: 1
- FWCI
- 1.67
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Diabetologia (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Advanced Glycation End Products research
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glycosylation and Glycoproteins Research
- Keywords
- type 1 diabetes, lysosomal enzymes, plasma enzyme activity, glycoside hydrolases, beta-glucuronidase, alpha-mannosidase, beta-galactosidase, glycemic control, HbA1, diabetes complications, diabetic microangiopathy, platelet-free plasma
- MeSH terms
- Acetylglucosaminidase, Adolescent, Adult, Aged, beta-Galactosidase, Blood Glucose, Diabetes Mellitus, Type 1, Diabetic Angiopathies, Female, Glucuronidase, Glycated Hemoglobin, Humans, Lysosomes, Male, Mannosidases, Middle Aged
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