Ohara Naoki, Takeichi Sanae, Naito Yukiko, Nakajima Yasuhiro, Yukawa Nobuhiro, Nakano Takamitsu, Nakajima Katsuyuki
Department of Pharmacology, Food and Drug Safety Center, Hatano Research Institute, Ochiai 729-5, Hadano, Kanagawa, 257-8523, Japan.
Clin Chim Acta. 2003 Dec;338(1-2):151-6. doi: 10.1016/j.cccn.2003.08.014.
Plasma levels of remnant-like particles (RLP) is one of the predictive markers for coronary artery disease (CAD), and the inhibition by RLP of endothelium-dependent vasorelaxation has been reported. We attempted to clarify whether or not RLP, which inhibits endothelium-dependent vasorelaxation, affects nitric oxide (NO) production and NO synthase (eNOS) levels in cultured endothelial cells.
RLP were obtained from postmortem blood of subjects who died of CAD. Modification by RLP of acetylcholine-induced relaxation of rabbit aorta, and changes in NO production and (eNOS) in cultured bovine endothelial cells were examined.
RLP at 750 and 1500 microg triglyceride/ml inhibited vasorelaxation, and at 5-160 microg triglyceride/ml, concentration-dependently inhibited NO production. However, (eNOS) did not decrease after incubation with RLP.
Postmortem RLP from subjects who died of CAD do not change the amount of (eNOS), but rather, inhibits its activity and attenuates endothelium-dependent vasorelaxation.
