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Department of Internal Medicine, Sahlgrenska University Hospital, Gröna Stråket 8, SE-413 45 Göteborg, Sweden
¹ Department of Clinical Physiology, Göteborg University, Göteborg, Sweden
² Musculoskeletal Disease Center, Jerry L Pettis Memorial VA Medical Center, Loma Linda, California, USA
³ Department of Pathology, Sahlgrenska University Hospital, Göteborg, Sweden

(Requests for offprints should be addressed to J Svensson; Email: johan.svensson{at}medic.gu.se)

The GH/-IGF-I axis is important for kidney size and function and may also be involved in the development of renal failure. In this study, the role of liver-derived endocrine IGF-I for kidney size and function was investigated in mice with adult liver-specific IGF-I inactivation (LI-IGF-I^–/– mice). These mice have an 80–85% reduction of serum IGF-I level and compensatory increased GH secretion. Seven-month-old as well as 24-month-old LI-IGF-I^–/– mice had decreased kidney weight. Glomerular filtration rate, assessed using creatinine clearance as well as creatinine clearance corrected for body weight, was unchanged. The 24-h urine excretion of sodium and potassium was increased in the LI-IGF-I^–/– mice. In the 24-month-old mice, there was no between-group difference in kidney morphology. Microarray and real-time PCR (RT-PCR) analyses showed a high renal expression of IGF-II in the control mice, whereas in the LI-IGF-I^–/– mice, there was a tissue-specific decrease in the renal IGF-II mRNA levels (–79%, P < 0.001 vs controls using RT-PCR). In conclusion, deficiency of circulating liver-derived IGF-I in mice results, despite an increase in GH secretion, in a global symmetrical decrease in kidney size, increased urinary sodium and potassium excretion, and a clear down regulation of renal IGF-II expression. However, the LI-IGF-I^–/– mice did not develop kidney failure or nephrosclerosis. One may speculate that liver-derived endocrine IGF-I induces renal IGF-II expression, resulting in symmetrical renal growth.

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