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Am J Physiol Regul Integr Comp Physiol 292: R373-R381, 2007. First published August 31, 2006; doi:10.1152/ajpregu.00292.2006
0363-6119/07 $8.00
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NEUROHUMORAL CONTROL OF CARDIOVASCULAR FUNCTION

Differential expression of neuronal ACE2 in transgenic mice with overexpression of the brain renin-angiotensin system

Marc F. Doobay,1,* Lauren S. Talman,1,* Teresa D. Obr,1,* Xin Tian,1 Robin L. Davisson,1,2 and Eric Lazartigues1,3,4

1Departments of Anatomy and Cell Biology and 2The Cardiovascular Center, Carver College of Medicine, The University of Iowa, Iowa City, Iowa; and 3Pharmacology and Experimental Therapeutics and 4Cardiovascular Center, Louisiana State University Health Sciences Center, New Orleans, Louisiana

Submitted 28 April 2006 ; accepted in final form 26 August 2006

Angiotensin-converting enzyme 2 (ACE2) is a newly discovered carboxy-peptidase responsible for the formation of vasodilatory peptides such as angiotensin-(1–7). We hypothesized that ACE2 is part of the brain renin-angiotensin system, and its expression is regulated by the other elements of this system. ACE2 immunostaining was performed in transgenic mouse brain sections from neuron-specific enolase-AT1A (overexpressing AT1A receptors), R+A+ (overexpressing angiotensinogen and renin), and control (nontransgenic littermates) mice. Results show that ACE2 staining is widely distributed throughout the brain. Using cell-type-specific antibodies, we observed that ACE2 staining is present in the cytoplasm of neuronal cell bodies but not in glial cells. In the subfornical organ, an area lacking the blood-brain barrier and sensitive to blood-borne angiotensin II, ACE2 was significantly increased in transgenic mice. Interestingly, ACE2 mRNA and protein expression were inversely correlated in the nucleus of tractus solitarius/dorsal motor nucleus of the vagus and the ventrolateral medulla, when comparing transgenic to nontransgenic mice. These results suggest that ACE2 is localized to the cytoplasm of neuronal cells in the brain and that ACE2 levels appear highly regulated by other components of the renin-angiotensin system, confirming its involvement in this system. Moreover, ACE2 expression in brain structures involved in the control of cardiovascular function suggests that the carboxypeptidase may have a role in the central regulation of blood pressure and diseases involving the autonomic nervous system, such as hypertension.

central nervous system; circumventricular organs; volume homeostasis; blood pressure; carboxypeptidase


Address for reprint requests and other correspondence: E. Lazartigues, Louisiana State Univ. Health Sciences Center, Dept. of Pharmacology and Experimental Therapeutics, 1901 Perdido St. P7–1, New Orleans, LA 70112 (e-mail: elazar{at}lsuhsc.edu)




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