Non-obese early onset diabetes mellitus in mutant cryptochrome1 transgenic mice.

Abstract:

BACKGROUND:An earlier report described that transgenic mice ubiquitously expressing cryptochrome1 (CRY1) with a mutation in cystein414 (CRY1-AP Tg mice) display diabetes mellitus in addition to anomalous circadian behaviours. This study examined characteristic aspects of symptoms to clarify the diabetes type and pathogenesis. MATERIALS AND METHODS:The body weights and blood glucose levels of CRY1-AP Tg mice were measured for 7weeks starting at 3weeks after birth. Glucose tolerance test for the mice of various ages and insulin tolerance test at 6weeks of age were conducted. Immunohistochemical analysis of islets was carried out for the mice of 19 and 40weeks of age. Basal and glucose-stimulated serum insulin levels of mice at 27weeks were also measured. RESULTS:Three-week-old CRY1-AP Tg mice, which showed mild retardation in growth, already displayed glucose intolerance. Hyperglycaemia progressed with age, without accompanying insulin resistance. Insulin-stained areas in islets in CRY1-AP Tg mice were smaller than that in wild-type controls. Both basal and glucose-stimulated secretion of insulin decreased in CRY1-AP Tg mice. CONCLUSION:The symptoms of diabetes in CRY1-AP Tg mice turned out to be similar to those of maturity onset diabetes of the young (MODY) in humans in terms of early onset, non-obesity and primary dysfunction of beta cells. The CRY1-AP Tg mice might serve as an animal model of early onset insulin-secretory defect of diabetes.

journal_name

Eur J Clin Invest

authors

Okano S,Hayasaka K,Igarashi M,Iwai H,Togashi Y,Nakajima O

doi

10.1111/j.1365-2362.2010.02359.x

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

1011-7

issue

11

eissn

0014-2972

issn

1365-2362

pii

ECI2359

journal_volume

40

pub_type

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