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Deprecated: Implicit conversion from float 253.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Growth+Horm+IGF+Res 2011 ; 21 (5): 279-84 Nephropedia Template TP
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A marked deficiency in circulating and renal IGF-I peptide does not inhibit compensatory renal enlargement in uninephrectomized mice #MMPMID21862442
Growth Horm IGF Res 2011[Oct]; 21 (5): 279-84 PMID21862442show ga
Objective: Increase in kidney IGF-I levels due to its increased trapping from the circulation was hypothesized to be a key mediator of compensatory renal enlargement. We tested this hypothesis using genetically engineered mice with extremely low circulating IGF-I levels. Design: Both IGF-I deficient (ID) and normal (N) mice underwent a uninephrectomy (UNx) and sacrificed 2 or 9 days later. Results: Initial body weight (BW) and kidney weight (KW) were significantly reduced in ID vs. N mice, while KW/BW ratios were similar. KW increased post-UNx to a comparable extent in ID and N mice (125±4 and 118±6% of pre-UNx KW, p<0.05 vs. C). Kidney IGF-I mRNA levels were similar in the ID and N mice and did not change post-UNx. Kidney IGF-I peptide levels pre-UNx were significantly lower in ID vs. N mice (25±5 vs. 305±39 ng/g) and increased in both groups after UNx, remaining low in ID mice (45±4 in ID vs 561±64 ng/g in N). IGF type 1 receptor phosphorylation was unchanged. Conclusion: While a severe deficiency of circulating IGF-I impairs body growth, UNx induces a significant and proportional increase in renal mass in ID mice despite markedly decreased kidney IGF-I levels (>90% reduction) and no significant change in receptor phosphorylation. This all suggests that factors other than circulating and locally produced IGF-I are responsible for compensatory renal enlargement.