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Volume 272, Number 44, Issue of October 31, 1997 pp. 28142-28148
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

The Kidney Androgen-regulated Protein Promoter Confers Renal Proximal Tubule Cell-specific and Highly Androgen-responsive Expression on the Human Angiotensinogen Gene in Transgenic Mice

(Received for publication, April 23, 1997, and in revised form, August 6, 1997)

Yueming Ding , Robin L. Davisson ^§ , Dianne O. Hardy , Li-Ji Zhu , David C. Merrill ^** , James F. Catterall and Curt D. Sigmund ^§

From the  Genetics Program, ^§ Departments of Internal Medicine and Physiology & Biophysics, ^** Department of Obstetrics and Gynecology, University of Iowa College of Medicine, Iowa City, Iowa 52242 and  The Population Council, The Rockefeller University, New York, New York 10021

Transgenic mice were generated containing a 1542-base pair fragment of the kidney androgen-regulated protein (KAP) promoter fused to the human angiotensinogen (HAGT) gene with the goal of specifically targeting inducible expression of renin-angiotensin system components to the kidney. High level expression of both KAP-HAGT and endogenous KAP mRNA was evident in the kidney of male mice from two independent transgenic lines. Renal expression of the transgene in female mice was undetectable under basal conditions but could be strongly induced by administration of testosterone. Testosterone treatment did not cause a transcriptional induction in any other tissues examined. However, an analysis of six androgen target tissues in males revealed that the transgene was expressed in epididymis. No other extra-renal expression of the transgene was detected. In situ hybridization demonstrated that expression of HAGT (and KAP) mRNA in males and testosterone-treated females was restricted to proximal tubule epithelial cells in the renal cortex. Although there was no detectable human angiotensinogen protein in plasma, it was evident in the urine, consistent with a pathway of synthesis in proximal tubule cells and release into the tubular lumen. These results demonstrate that 1542 base pairs of the KAP promoter is sufficient to drive expression of a heterologous reporter gene in a tissue-specific, cell-specific, and androgen-regulated fashion in transgenic mice.

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