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Circulation. 1998;97:263-267

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(Circulation. 1998;97:263-267.)
© 1998 American Heart Association, Inc.


Clinical Investigation and Reports

Cell-Free and Erythrocytic S-Nitrosohemoglobin Inhibits Human Platelet Aggregation

John R. Pawloski; Rajesh V. Swaminathan; ; Jonathan S. Stamler

From the Howard Hughes Medical Institute (J.S.S.) and Department of Medicine (J.R.P., J.S.S.) and Division of Pulmonary and Cardiovascular Medicine (R.V.S., J.S.S.), Duke University Medical Center, Durham, NC.

Correspondence to Jonathan S. Stamler, MD, Duke University Medical Center, Howard Hughes Medical Institute, Room 321 MSRB, Box 2612, Durham, NC 27710.

Background—Nitric oxide (NO) and related molecules are thought to inhibit human platelet aggregation by raising levels of cGMP.

Methods and Results—Both oxidative stress (reactive oxygen species) and hemoglobin (Hb) seem to oppose NO effects. A major fraction of NO in the blood is bound to thiols of Hb, forming S-nitrosohemoglobin (SNO-Hb), which releases the NO group on deoxygenation in the microcirculation. Here we show that (1) both cell-free and intraerythrocytic SNO-Hb (SNO-RBC) inhibit platelet aggregation, (2) the oxidation state of the hemes in Hb influences the response—SNO-metHb (which is functionally similar to SNO-deoxyHb) has greater platelet inhibitory effects than SNO-oxyHb, and (3) the mechanism of platelet inhibition by SNO-Hb is cGMP independent.

Conclusions—We suggest that the RBC has evolved a means to counteract platelet activation in small vessels and the proaggregatory effects of oxidative stress by forming SNO-Hb.


Key Words: S-nitrosohemoglobin • nitric oxide • platelets




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