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John W. Osborn, Jr., Ph.D. Professor, Department Physiology E-mail: osbor003@umn.edu

Research Interests:

Research in my laboratory is directed toward understanding the role of the central nervous system in long-term regulation of arterial pressure and the pathogenesis of hypertension. At the present time, we are investigating how circulating peptide hormones, such as vasopressin and angiotensin II, are monitored by specialized sites within the brain called circumventricular organs. We are investigating how these regions influence sympathetic nerve discharge and ultimately the regulation of arterial pressure. Our long-term goal is to understand , in a quantitative way, the role of such hormonal-sympathetic interactions in normal physiology and the pathophysiology of hypertension. Presently, we are studying how such interactions are influenced by alterations in dietary salt in hopes of understanding the neurogenic basis of salt-dependent hypertension. We employ a variety of experimental approaches to address these questions; long-term monitoring of cardiovacular dynamics in chronically instrumented animals, neurophysiological studies and c-fos immunotcytochemistry mapping of central autonomic pathways.

Selected Publications:

Osborn JW, Collister JP, Guzman P. Effect of peripheral sympathetic nerve dysfunction on salt sensitivity of arterial pressure. Clin Exp Pharmacol Physiol. 2007 Oct 30.

McBryde FD, Guild SJ, Barrett CJ, Osborn JW, Malpas SC. Angiotensin II-based hypertension and the sympathetic nervous system: the role of dose and increased dietary salt in rabbits. Exp Physiol. 2007 Sep;92(5):831-40.

King AJ, Osborn JW, Fink GD. Splanchnic circulation is a critical neural target in angiotensin II salt hypertension in rats. Hypertension. 2007 Sep;50(3):547-56.

Osborn JW, Fink GD, Sved AF, Toney GM, Raizada MK. Circulating angiotensin II and dietary salt: converging signals for neurogenic hypertension. Curr Hypertens Rep. 2007 Jun;9(3):228-35. Review.

Osborn JW, Jacob F, Hendel M, Collister JP, Clark L, Guzman PA. Effect of subfornical organ lesion on the development of mineralocorticoid-salt hypertension. Brain Res. 2006 Sep 13;1109(1):74-82.

Collister JP, Osborn JW. Role of a responsive sympathetic nervous system in the chronic hypotensive effects of losartan in normal rats. J Cardiovasc Pharmacol. 2005 Aug;46(2):147-54.

Jacob F, Clark LA, Guzman PA, Osborn JW. Role of renal nerves in development of hypertension in DOCA-salt model in rats: a telemetric approach. Am J Physiol Heart Circ Physiol. 2005 Oct;289(4):H1519-29.

Osborn JW. Hypothesis: set-points and long-term control of arterial pressure. A theoretical argument for a long-term arterial pressure control system in the brain rather than the kidney. Clin Exp Pharmacol Physiol. 2005 May-Jun;32(5-6):384-93.

Jacob F, LaBine BG, Ariza P, Katz SA, Osborn JW. Renal denervation causes chronic hypotension in rats: role of beta1-adrenoceptor activity. Clin Exp Pharmacol Physiol. 2005 Apr;32(4):255-62.

Osborn JW, Jacob F, Guzman P.   A neural set point for the long-term control of arterial pressure: beyond the arterial baroreceptor reflex. Am J Physiol Regul Integr Comp Physiol. 2005 Apr;288(4):R846-55.

Recent Graduate Students

Joanna Abrams (Ph.D. 2008, Neuroscience, University of Minnesota).

John P. Collister, D.V.M, Ph.D. 1999. Graduate program in Molecular Veterinary Biosciences. Dissertation: "Angiotensin-sympathetic interactions in the long-term control of arterial pressure". Current Position: Research Associate, Department of Veterinary PathoBiology, University of Minnesota.

David P. Slovut, M.D., Ph.D. 1998. Graduate Program in Cellular and Integrative Physiology. Dissertation: "Mechanisms of heart rate variablity after cardiac allograft transplantation. Current Position: Cardiology Fellow, University of Michigan.

Scott Carlson, Ph.D. 1996. Graduate Program in Cellular and Integrative Physiology. Dissertation: "The role of peripheral osmoreceptors in the control of arginine vasopressin release". Current Position: Assistant Professor, Luther College.