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AJP - Heart and Circulatory Physiology, Vol 269, Issue 6 2044-H2050, Copyright © 1995 by American Physiological Society
ARTICLES |
C. V. Oddis, R. L. Simmons, B. G. Hattler and M. S. Finkel
Department of Pathology, University of Pittsburgh School of Medicine, Pennsylvania 15213, USA.
The effects of adenosine 3',5'-cyclic monophosphate (cAMP) on cardiac myocyte nitric oxide (NO) production were studied. Maximal nitrite (NO2(-)) production by cultured neonatal rat cardiac myocytes was achieved with 500 U/ml interleukin-1 beta (IL-1 beta) for 48 h (4.6 +/- 0.3 nmol/1.25 x 10(5) cells; n = 12). Cardiac myocytes exposed to 500 U/ml IL-1 beta for 48 h stained positively for inducible nitric oxide synthase (iNOS) by immunohistochemistry. Forskolin (FSK; adenylate cyclase stimulator) or dibutyryl cAMP (DBcAMP; membrane-permeable cAMP analogue) administration alone had no effect on NO2(-) production. The addition of FSK or DBcAMP to IL-1 beta significantly increased NO2-) levels vs. IL-1 beta alone (9.7 +/- 0.6 and 10.9 +/- 0.8 vs. 4.6 +/- 0.3 nmol/1.25 x 10(5) cells per 48 h, respectively; P < 0.01; n = 12). Semiquantitative reverse transcriptase-polymerase chain reaction revealed increased iNOS mRNA in myocytes treated with FSK+IL-1 beta or DBcAMP+IL-1 beta vs. those treated with IL-1 beta alone. The addition of FSK or DBcAMP to IL-1 beta increased iNOS mRNA half-life over IL-1 beta treatment alone (10.6, 11.7 vs. 2.4 h, respectively). Cardiac myocytes do not express iNOS in response to cAMP alone. Rather, cAMP enhances iNOS mRNA stability following cytokine exposure.
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