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Title: Kidney insulin-like growth factor-I mRNA levels are increased in postpubertal diabetic rats.
Austin Authors: Bach, Leon A;Stevenson, J L;Allen, Terri J;Jerums, George ;Herington, A C
Affiliation: Department of Medicine, University of Melbourne, Austin Hospital, Heidelberg, Victoria, Australia
Issue Date: 1-Apr-1991
Publication information: The Journal of Endocrinology; 129(1): 5-10
Abstract: Diabetes-associated renal enlargement is more marked in postpubertal than prepubertal rats, and in the postpubertal rat, is associated with increased kidney insulin-like growth factor-I (IGF-I) levels for the first 2 days. In order to determine whether local IGF-I production is the cause of this increase in tissue levels, IGF-I mRNA levels were determined in pre- and postpubertal Sprague-Dawley rats made diabetic with streptozotocin (STZ) and in control rats. RNA was extracted from kidneys and livers of rats at 0 h, 6 h, 12 h and days 1, 2, 3 and 7 after STZ injection. After Northern blotting and hybridization with an oligonucleotide probe complementary to an E domain of the IGF-I cDNA, four distinct bands (7.4, 4.8, 1.8 and 1.0 kb) were found. Densitometric analyses of the most prominent bands (7.4 and 1.0 kb), after normalization for 18S ribosomal RNA content, revealed a 50-100% increase in the kidneys of postpubertal diabetic rats compared with postpubertal controls 12 h after STZ injection (P less than 0.05, diabetes vs control). Between days 2 and 7, kidney IGF-I mRNA levels in postpubertal diabetic rats fell to approximately 50% of control levels (P less than 0.05, diabetes vs control). In contrast, kidney IGF-I mRNA levels in the prepubertal diabetic rats remained unchanged over the 7 days. Liver IGF-I mRNA levels did not rise during the first 24 h and fell to approximately 60% of control levels by day 7 in both pre- and postpubertal diabetic rats (P less than 0.05, diabetes vs control). Increased local IGF-I production may underlie the initiation of renal enlargement associated with diabetes mellitus.
Gov't Doc #: 2030329
Type: Journal Article
Subjects: Animals
Base Sequence
Blotting, Northern
DNA Probes
Diabetes Mellitus, Experimental.genetics
Gene Expression.physiology
Insulin-Like Growth Factor I.genetics
Molecular Sequence Data
RNA, Messenger.analysis
Rats, Inbred Strains
Sexual Maturation.genetics
Appears in Collections:Journal articles

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