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Impaired cathepsin ...
Impaired cathepsin L gene expression in skeletal muscle is associated with type 2 diabetes.
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- Huang, Xudong (författare)
- Lund University,Lunds universitet,Institutionen för kliniska vetenskaper, Malmö,Medicinska fakulteten,Department of Clinical Sciences, Malmö,Faculty of Medicine
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Vaag, Allan (författare)
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- Nilsson, Emma A (författare)
- Lund University,Lunds universitet,Genomik, diabetes och endokrinologi,Forskargrupper vid Lunds universitet,Diabetes - epigenetik,Genomics, Diabetes and Endocrinology,Lund University Research Groups,Diabetes - Epigenetics
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Hansson, Mona (författare)
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- Ahrén, Bo (författare)
- Lund University,Lunds universitet,Medicin, Lund,Sektion II,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Medicine, Lund,Section II,Department of Clinical Sciences, Lund,Faculty of Medicine
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- Groop, Leif (författare)
- Lund University,Lunds universitet,Genomik, diabetes och endokrinologi,Forskargrupper vid Lunds universitet,Genomics, Diabetes and Endocrinology,Lund University Research Groups
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(creator_code:org_t)
- American Diabetes Association, 2003
- 2003
- Engelska.
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Ingår i: Diabetes. - : American Diabetes Association. - 1939-327X .- 0012-1797. ; 52:9, s. 2411-2418
- Relaterad länk:
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http://www.ncbi.nlm.... (free)
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http://dx.doi.org/10... (free)
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http://diabetes.diab...
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https://lup.lub.lu.s...
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https://doi.org/10.2...
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Abstract
Ämnesord
Stäng
- To identify abnormally expressed genes associated with muscle insulin resistance or type 2 diabetes, we screened the mRNA populations using cDNA differential display combined with relative RT-PCR analysis from muscle biopsies of diabetes-prone C57BL/6J and diabetes-resistant NMRI mice fed with a high-fat or normal diet for 3 or 15 months. Six abnormally expressed genes were isolated from the mice after a 3-month fat feeding; one of them was cathepsin L. No significant difference in mRNA levels of these genes was observed between fat- and normal-diet conditions in either strains. However, cathepsin L mRNA levels in muscle were higher in normal diet–fed C57BL/6J mice compared with normal diet–fed NMRI mice at 3 months (0.72 ± 0.04 vs. 0.51 ± 0.04 relative units, P < 0.01, n = 8–10) and at 15 months (0.41 ± 0.05 vs. 0.27 ± 0.04 relative units, P = 0.01, n = 9–10). Further, cathepsin L mRNA levels in muscle correlated inversely with plasma glucose in both strains regardless of diets at 3 (r = −0.49, P < 0.01, n = 31) and 15 (r = −0.42, P = 0.007, n = 39) months. To study whether cathepsin L plays a role in human diabetes, we measured cathepsin L mRNA levels in muscle biopsies taken before and after an insulin clamp from 12 monozygotic twin pairs discordant for type 2 diabetes and from 12 control subjects. Basal cathepsin L mRNA levels were not significantly different between the study groups. Insulin infusion increased cathepsin L mRNA levels in control subjects from 1.03 ± 0.30 to 1.90 ± 0.32 relative units (P = 0.03). Postclamp cathepsin L mRNA levels were lower in diabetic twins but similar in nondiabetic twins compared with control subjects (0.66 ± 0.22, 1.16 ± 0.18 vs. 1.38 ± 0.21 relative units, P < 0.02, NS, respectively). Further, postclamp cathepsin L mRNA levels were correlated with insulin-mediated glucose uptake (r = 0.37, P = 0.03), particularly, with glucose oxidation (r = 0.37, P = 0.03), and fasting glucose concentrations (r = −0.45, P < 0.01) across all three study groups. In conclusion, muscle cathepsin L gene expression is increased in diabetes-prone mice and related to glucose tolerance. In humans, insulin-stimulated cathepsin L expression in skeletal muscle is impaired in diabetic but not in nondiabetic monozygotic twins, suggesting that the changes may be secondary to impaired glucose metabolism.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Endokrinologi och diabetes (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Endocrinology and Diabetes (hsv//eng)
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