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Pravastatin induces NO synthesis by enhancing microsomal arginine uptake in healthy and preeclamptic placentas.


ABSTRACT: BACKGROUND:Pravastatin, a known inducer of endothelial nitric-oxide synthase (eNOS) was demonstrated in human placenta, however the exact mechanism of it's action is not fully understood. Since placental NO (nitric oxide) synthesis is of primary importance in the regulation of placental blood flow, we aimed to clarify the effects of pravastatin on healthy (n?=?6) and preeclamptic (n?=?6) placentas (Caucasian participants). METHODS:The eNOS activity of human placental microsomes was determined by the conversion rate of C14 L-arginine into C14 L-citrulline with or without pravastatin and Geldanamycin. Phosphorylation of eNOS (Ser1177) was investigated by Western blot. Microsomal arginine uptake was measured by a rapid filtration method. RESULTS:Pravastatin significantly increased total eNOS activity in healthy (28%, p<0.05) and preeclamptic placentas (32%, p<0.05) using 1?mM Ca2+ promoting the dissociation of a eNOS from it's inhibitor caveolin. Pravastatin and Geldanamycin (Hsp90 inhibitor) cotreatment increased microsomal eNOS activity. Pravastatin treatment had no significant effects on Ser1177 phosphorylation of eNOS in either healthy or preeclamptic placentas. Pravastatin induced arginine uptake of placental microsomes in both healthy (38%, p?

SUBMITTER: Panczel Z 

PROVIDER: S-EPMC6868828 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature

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Pravastatin induces NO synthesis by enhancing microsomal arginine uptake in healthy and preeclamptic placentas.

Pánczél Zita Z   Kukor Zoltán Z   Supák Dorina D   Kovács Bence B   Kecskeméti András A   Czizel Rita R   Djurecz Magdolna M   Alasztics Bálint B   Csomó Krisztián Benedek KB   Hrabák András A   Valent Sándor S  

BMC pregnancy and childbirth 20191120 1


<h4>Background</h4>Pravastatin, a known inducer of endothelial nitric-oxide synthase (eNOS) was demonstrated in human placenta, however the exact mechanism of it's action is not fully understood. Since placental NO (nitric oxide) synthesis is of primary importance in the regulation of placental blood flow, we aimed to clarify the effects of pravastatin on healthy (n = 6) and preeclamptic (n = 6) placentas (Caucasian participants).<h4>Methods</h4>The eNOS activity of human placental microsomes wa  ...[more]

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