Enhanced neutrophil superoxide anion production and its modification by beraprost sodium in spontaneously hypertensive rats.

Abstract:

:To clarify the function of polymorphonuclear leukocytes (PMN) in spontaneously hypertensive rats (SHR) and the effect of beraprost sodium (BS) on these functions, we examined superoxide anion (O2-) production and adherent activity by PMN, as well as modification of these functions by BS ex vivo and in vitro. In study 1, we measured PMN functions in 4-week-old SHR and Wistar-Kyoto (WKY) rats. In study 2 (ex vivo), 14-week-old SHR received vehicle (n = 6) and BS (30 microg/kg/day [n = 6] and 100 microg/kg/day [n = 7]) once daily for 4 weeks. In study 3 (in vitro), PMN from 18-week-old SHR were incubated with BS (0.1 and 1 micromol/L) and theophylline (200 micromol/L), which is reported to inhibit the PMN O2- production. Systolic blood pressure, platelet counts, and PMN O2- production stimulated by phorbol ester myristate acetate were significantly elevated in 4-week-old SHR compared with WKY (P < .05). Beraprost sodium decreased the ex vivo PMN O2- production, serum superoxide dismutase activity, and platelet counts (P < .05); however, BS did not reduce the in vitro PMN O2- production. These data support our hypothesis that the enhanced PMN function contributes to the cardiovascular damages during the early phase of SHR, and that BS has merit for preventing the O2- related organ damages in this model.

journal_name

Am J Hypertens

authors

Ohmori M,Kitoh Y,Kawaguchi A,Harada K,Sugimoto K,Fujimura A

doi

10.1016/s0895-7061(01)01309-7

subject

Has Abstract

pub_date

2001-07-01 00:00:00

pages

722-8

issue

7 Pt 1

eissn

0895-7061

issn

1941-7225

pii

S0895706101013097

journal_volume

14

pub_type

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