Red blood cell rheological alterations in hypertension induced by chronic inhibition of nitric oxide synthesis in rats

Bor-Kucukatay M., Yalcin O., Gokalp O., Kipmen-Korgun D., Yesilkaya A., Baykal A., ...Daha Fazla

CLINICAL HEMORHEOLOGY AND MICROCIRCULATION, cilt.22, sa.4, ss.267-275, 2000 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 22 Sayı: 4
  • Basım Tarihi: 2000
  • Dergi Adı: CLINICAL HEMORHEOLOGY AND MICROCIRCULATION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.267-275
  • Anahtar Kelimeler: hypertension, erythrocyte aggregation, erythrocyte deformability, nitric oxide, L-NAME, SUPEROXIDE ANIONS, LEUKOCYTE COUNTS, OXIDATIVE STRESS, DEFORMABILITY, ERYTHROCYTES, AGGREGABILITY, ABNORMALITIES, AGGREGATION, ACTIVATION, FLUIDITY
  • Akdeniz Üniversitesi Adresli: Evet

Özet

Nitric oxide (NO) plays a major role in vascular regulation. Modulation of NO synthesis is known to influence blood pressure. Inhibition of NO synthesis by NG-nitro-L-arginine methyl ester (L-NAME; 72 mg/kg/day, p.o., 21 days) resulted in 60% increase in blood pressure in rats. Red blood cell (RBC) transit time measured by the cell transit analyzer increased significantly in the L-NAME treated group, in comparison to normotensive rats. RBC aggregation measured in autologous plasma, by a photometric rheoscope also increased significantly in the hypertensive rats. RBC cytosolic free calcium concentration was also significantly higher in the hypertensive animals. Incubation of RBC from hypertensive and control animals with NO donor, sodium nitroprussid (SNP; 10-1000 mu M) for 60 minutes resulted in a dose-dependent decrease in RBC aggregation, however aggregation index was significantly higher in hypertensive group at each SNP concentration. Incubation with SNP had no effect on RBC deformability in the control group, while a slight decrease in RBC transit time was observed only at 10 mu M SNP in the hypertensive group. These results imply that NO may play a role in the regulation of rheological properties of RBC and the alterations in these properties may at least in part be involved in the development of L-NAME induced hypertension.