Ovariectomy upregulates expression of estrogen receptors, NOS, and HSPs in porcine platelets

Muthuvel Jayachandran, Virginia M. Miller

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


Platelets participate in normal and pathological thrombotic processes. Hormone replacement in postmenopausal women is associated with increase risk for thrombosis. However, little is known regarding how platelets are affected by hormonal status. Nitric oxide (NO) modulates platelet functions and is modulated by hormones. Therefore, the present study was designed to determine how loss of ovarian hormones changes expression of estrogen receptors and regulatory proteins for NO synthase (NOS) in platelets. Estrogen receptors (ERα and ERβ), NOS, heat shock proteins 70 and 90 (HSP70 and HSP90), caveolin-1, -2, and -3, calmodulin, NOS activity, and cGMP were analyzed in a lysate of platelets from gonadally intact and ovariectomized female pigs. Expression of ERβ and ERα receptors, endothelial NOS (eNOS), HSP70, and HSP90 increased with ovariectomy. NOS activity and cGMP also increased; calmodulin was unchanged. Caveolins were not detected. These results suggest that ovarian hormones influence expression of estrogen receptors and eNOS in platelets. Changes in estrogen receptors and NOS could affect platelet aggregation in response to hormone replacement.

Original languageEnglish (US)
Pages (from-to)H220-H226
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Issue number1 52-1
StatePublished - 2002


  • 17β-estradiol
  • Endothelial nitric oxide synthase
  • Heat shock protein
  • Hormones
  • Inducible nitric oxide synthase
  • Megakaryocytes
  • Nitric oxide synthase

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)


Dive into the research topics of 'Ovariectomy upregulates expression of estrogen receptors, NOS, and HSPs in porcine platelets'. Together they form a unique fingerprint.

Cite this