Ionomycin, a Ca++ ionophore, increases platelet volume independently of the Na+/H+ exchanger.

Abstract:

:A Ca++-ionophore, ionomycin, increased the volume of human platelets suspended in a Ca++-containing buffer. This change in cell volume was dependent upon ionomycin and extracellular Ca++ concentrations, suggesting that the volume change occurs when the intracellular Ca++ reaches a certain level (greater than uM as determined by aequorin method). The ionomycin-induced volume increase was suppressed by replacement of extracellular Na+ with membrane-impermeable N-methyl-D-glucamine or Cs+, but not with Li+, K+, or Rb+. Ethylisopropylamiloride, a potent inhibitor of the Na+/H+ exchanger, had only weak inhibitory effect, and the apparent Km for Na+ was approximately 350 mM, which is much larger than that of the Na+/H+ exchanger. It is suggested that certain mechanisms other than the Na+/H+ exchanger are responsible for ionomycin-induced volume increase.

journal_name

Thromb Res

journal_title

Thrombosis research

authors

Ozaki Y,Matsumoto Y,Yatomi Y,Higashihara M,Kariya T,Kume S

doi

10.1016/0049-3848(90)90197-k

subject

Has Abstract

pub_date

1990-01-01 00:00:00

pages

87-95

issue

1

eissn

0049-3848

issn

1879-2472

journal_volume

57

pub_type

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