The aims of this study are to evaluate the relative contributions of atrial stretch receptors and atrial natriuretic peptides to the increases in sodium excretion and urine flow that occur in response to stimuli that elevate left atrial pressure. Another aim is to establish a dose-response relationship between a-human atrial natriuretic peptide (ahANP) and a large number of renal and cardiovascular variables. Finally, we propose to determine whether neuropeptide-Y (NPY) is released from the atrial when they are distended and, if so, to determine whether a combined infusion of ahANP and NPY acts synergistically to augment renal salt and water excretion. Because left atrial distension also elicits cardiovascular changes, we will monitor multiple hemodynamic variables and analyze them as part of each series of experiments. These studies are health related because it is clear that the concentration of ANP in plasma is altered in both acute and chronic cardiovascular disease. There are reasons to suspect that the concentration of NPY in plasma also may be altered under similar conditions. In addition, atrial stretch receptors are distorted by chronic elevations of atrial pressure and reportedly become less responsive to stretch. Because these components of the atrial appear to be involved directly in the regulation of fluid balance and a number of cardiovascular variables, certain abnormalities in fluid balance that commonly occur in patients with cardiovascular disease may be attributable, at least in part, to adverse effects arising from one or more of the atrial components described above. A better understanding of the physiological and pathophysiological mechanisms influencing salt and water balance should offer clues to better management of patients with derangements in body fluid balance.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL038139-03
Application #
3354191
Study Section
Cardiovascular and Pulmonary Research B Study Section (CVB)
Project Start
1987-04-01
Project End
1990-03-31
Budget Start
1989-04-01
Budget End
1990-03-31
Support Year
3
Fiscal Year
1989
Total Cost
Indirect Cost
Name
Saint Luke's Hospital
Department
Type
DUNS #
City
Kansas City
State
MO
Country
United States
Zip Code
64111
Leadley Jr, R J; Zhu, J L (1992) Cardiorenal reflexes do not attenuate the renal effects of infused atriopeptin in conscious dogs. Proc Soc Exp Biol Med 201:40-6
Leadley Jr, R J; Zhu, J L; Goetz, K L (1991) Effects of endothelin-1 and sarafotoxin S6b on regional hemodynamics in the conscious dog. Am J Physiol 260:R1210-7
Goetz, K L (1990) Evidence that atriopeptin is not a physiological regulator of sodium excretion. Hypertension 15:9-19
Wang, B C; Leadley Jr, R J; Goetz, K L (1990) Atriopeptin alters the vasopressin and renin responses elicited by hemorrhage. Proc Soc Exp Biol Med 193:85-91
Goetz, K; Drummer, C; Zhu, J L et al. (1990) Evidence that urodilatin, rather than ANP, regulates renal sodium excretion. J Am Soc Nephrol 1:867-74
Bie, P; Wang, B C; Leadley Jr, R J et al. (1990) Enhanced atrial peptide natriuresis during angiotensin and aldosterone blockade in dogs. Am J Physiol 258:R1101-7
Zhu, J L; Leadley Jr, R J; Geer, P G et al. (1990) Norepinephrine-induced atriopeptin release in conscious dogs is mediated by alterations in atrial pressure. Life Sci 46:139-45
Goetz, K; Wang, B C; Leadley Jr, R et al. (1989) Endothelin and sarafotoxin produce dissimilar effects on renal blood flow, but both block the antidiuretic effects of vasopressin. Proc Soc Exp Biol Med 191:425-7
Goetz, K L (1988) Physiology and pathophysiology of atrial peptides. Am J Physiol 254:E1-15
Bie, P; Wang, B C; Leadley Jr, R J et al. (1988) Hemodynamic and renal effects of low-dose infusions of atrial peptide in awake dogs. Am J Physiol 254:R161-9

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