Lipid peroxidation and active calcium transport in inside-out vesicles of red blood cells from preeclamptic women.
We previously reported that in preeclampsia Ca-ATPase activity diminishes about 50% in red blood cells, myometrium and syncitiotrophoblast plasma membranes. In this work, we measured the active Ca++ uptake by inside-out vesicles of human red blood cells from preeclamptic and normotensive pregnant women. Active calcium uptake by the vesicles was diminished by 49+/-3% in the preeclamptic women as compared to the gestational controls ( 8.06 +/- 0.11 nmol Ca++/mg protein min, gestational controls; 4.08 +/- 0.1 nmol Ca++/mg protein min, preeclamptics). This lowered calcium uptake correlates well with the lowered Ca-ATPase activity found in the red blood cells ghosts of the preeclamptic women (17.05 +/- 0.96 nmol Pi/mg protein min, gestational controls; 8.85 +/- 0.45 nmol Pi/mg protein min, preeclamptics). The reduced calcium uptake and Ca-ATPase activity of the red cell membranes both appear to be associated with a high level of lipid peroxidation. Thus there is a diminution in the active transport of calcium in the red blood cells of preeclamptic women. If this also occurs in other cell types of the preclamptic women, it could result in an increase in their cytosolic calcium concentration which might be responsible, in part, for some of the symptoms of this disease.
Centro de Biofísica y Bioquímica, Instituto Venezolano de Investigaciones Científicas, A.P. 21827, Caracas 1020A, Venezuela.
Alejando
A
Teppa-Garrán
Teresa
T
Proverbio
Reinaldo
R
Marín
Fulgencio
F
Proverbio
D001693:Biological Transport, Active; D002084:Butylated Hydroxytoluene / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism*; D000252:Calcium-Transporting ATPases / Q000378:metabolism; D022162:Cytoplasmic Vesicles / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects; D004910:Erythrocyte Membrane / Q000187:drug effects / Q000378:metabolism* / Q000528:radiation effects; D005260:Female; D006801:Humans; D015227:Lipid Peroxidation / Q000502:physiology*; D011225:Pre-Eclampsia / Q000378:metabolism*; D011247:Pregnancy; D017392:Thiobarbituric Acid Reactive Substances / Q000737:chemistry / Q000378:metabolism; D014466:Ultraviolet Rays
D017392:Thiobarbituric Acid Reactive Substances; D002084:Butylated Hydroxytoluene; D000252:Calcium-Transporting ATPases; D002118:Calcium