Gender, exercise training, and eNOS expression in porcine skeletal muscle arteries

M. Harold Laughlin, Wade V. Welshons, Michael Sturek, James W E Rush, James R. Turk, Julia A. Taylor, Barbara M. Judy, Kyle K. Henderson, V. K. Ganjam

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Our purpose was to determine the effects of gender and exercise training on endothelial nitric oxide synthase (eNOS) and superoxide dismutase (SOD) protein content of porcine skeletal muscle arteries and to evaluate the role of 17β-estradiol (E2) in these effects. We measured eNOS and SOD content with immunoblots and immunohistochemistry in femoral and brachial arteries of trained and sedentary male and female pigs and measured estrogen receptor (ER) mRNA and α-ER and β-ER protein in aortas of male and female pigs. Results indicate that female arteries contain more eNOS than male arteries and that exercise training increases eNOS content independent of gender. Male and female pigs expressed similar levels of α-ER mRNA and protein and similar amounts β-ER protein in their arteries. E2 concentrations as measured by RIA were 180 ± 34 pg/ml in male sera and ∼5 pg/ml in female sera, and neither was changed by training. However, bioassay indicated that biologically active estrogen equivalent to only 35 ± 5 pg/ml was present in male sera. E2 in female pigs, whether measured by RIA or bioassay, was ∼24 pg/ml at peak estrous and 2 pg/ml on day 5 diestrus. The free fraction of E2 in sera did not explain the low measurements, relative to RIA, of E2. We conclude that 1) gender has significant influence on eNOS and SOD content of porcine skeletal muscle arteries; 2) the effects of gender and exercise training vary among arteries of different anatomic origin; 3) male sera contains compounds that cause RIA to overestimate circulating estrogenic activity; and 4) relative to human men, the male pig is not biologically estrogenized by high levels of E2 reported by RIA, whereas in female pigs E2 levels are lower than in the blood of human women.

Original languageEnglish (US)
Pages (from-to)250-264
Number of pages15
JournalJournal of Applied Physiology
Volume95
Issue number1
StatePublished - Jul 1 2003
Externally publishedYes

Fingerprint

Nitric Oxide Synthase Type III
Skeletal Muscle
Swine
Arteries
Exercise
Superoxide Dismutase
Serum
Estrogen Receptors
Biological Assay
Diestrus
Messenger RNA
Brachial Artery
Femoral Artery
Aorta
Estradiol
Estrogens
Immunohistochemistry

Keywords

  • Biological activity
  • Endothelial nitric oxide synthase
  • Estradiol-free fraction
  • Estrogen
  • Nitric oxide
  • Radioimmunoassay
  • Skeletal muscle blood flow
  • Vascular smooth muscle

ASJC Scopus subject areas

  • Physiology
  • Endocrinology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Laughlin, M. H., Welshons, W. V., Sturek, M., Rush, J. W. E., Turk, J. R., Taylor, J. A., ... Ganjam, V. K. (2003). Gender, exercise training, and eNOS expression in porcine skeletal muscle arteries. Journal of Applied Physiology, 95(1), 250-264.

Gender, exercise training, and eNOS expression in porcine skeletal muscle arteries. / Laughlin, M. Harold; Welshons, Wade V.; Sturek, Michael; Rush, James W E; Turk, James R.; Taylor, Julia A.; Judy, Barbara M.; Henderson, Kyle K.; Ganjam, V. K.

In: Journal of Applied Physiology, Vol. 95, No. 1, 01.07.2003, p. 250-264.

Research output: Contribution to journalArticle

Laughlin, MH, Welshons, WV, Sturek, M, Rush, JWE, Turk, JR, Taylor, JA, Judy, BM, Henderson, KK & Ganjam, VK 2003, 'Gender, exercise training, and eNOS expression in porcine skeletal muscle arteries', Journal of Applied Physiology, vol. 95, no. 1, pp. 250-264.
Laughlin MH, Welshons WV, Sturek M, Rush JWE, Turk JR, Taylor JA et al. Gender, exercise training, and eNOS expression in porcine skeletal muscle arteries. Journal of Applied Physiology. 2003 Jul 1;95(1):250-264.
Laughlin, M. Harold ; Welshons, Wade V. ; Sturek, Michael ; Rush, James W E ; Turk, James R. ; Taylor, Julia A. ; Judy, Barbara M. ; Henderson, Kyle K. ; Ganjam, V. K. / Gender, exercise training, and eNOS expression in porcine skeletal muscle arteries. In: Journal of Applied Physiology. 2003 ; Vol. 95, No. 1. pp. 250-264.
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