Differential development of umbilical and systemic arteries. II. Contractile proteins

Yvonne Arens, Rene A. Chapados, Blair E. Cox, Kristine E. Kamm, Charles R. Rosenfeld

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30 Citations (Scopus)

Abstract

In fetal sheep, umbilical responsiveness to ANG II exceeds systemic vascular responsiveness. Fetal systemic vascular smooth muscle (VSM) exhibits an immature phenotype with decreased contractile protein contents, low 200- kDa myosin heavy chain (MHC) SM2, and significant nonmuscle MHC-B expression, whereas umbilical VSM phenotype is incompletely described. We tested the hypothesis that differences in vascular responsiveness could reflect dissimilarities in VSM phenotype. Actin, MHC, MHC isoforms, and active stresses were compared in strips of femoral arteries and aorta from near- term fetal (n = 12) and adult (n = 12) sheep to those in external and intra- abdominal umbilical arteries. Actin contents in fetal femoral artery and aorta were less (P ≤ 0.006) than in external umbilical artery (7.37 ± 1.4 and 7.53 ± 0.7 vs. 21.6 ± 2.2 μg/mg wet wt, respectively) as were MHC contents (3.17 ± 0.4 and 2.84 ± 0.3 vs. 7.16 ± 0.7, respectively). Whereas 204-and 200-kDa MHC were expressed equally in fetal systemic arteries, umbilical and adult arteries predominantly expressed the 204-kDa isoform (SM1); only fetal systemic VSM expressed MHC-B. Fetal systemic artery stresses and myosin light chain phosphorylation were less than those in umbilical and adult arteries (P < 0.001). Compared with umbilical and adult arteries, fetal systemic VSM is biochemically and functionally immature and thus umbilical VSM demonstrates precocious maturation resembling adult VSM in protein expression and function.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume274
Issue number6 43-6
StatePublished - 1998

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Contractile Proteins
Umbilical Arteries
Vascular Smooth Muscle
Myosin Heavy Chains
Umbilicus
Femoral Artery
Phenotype
Blood Vessels
Aorta
Actins
Sheep
Protein Isoforms
Arteries
Smooth Muscle Myosins
Myosin Light Chains
Muscle Proteins
Phosphorylation

Keywords

  • Active stresses
  • Fetal sheep
  • Myosin heavy chain isoforms
  • Myosin light chain phosphorylation
  • Smooth muscle phenotype

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

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title = "Differential development of umbilical and systemic arteries. II. Contractile proteins",
abstract = "In fetal sheep, umbilical responsiveness to ANG II exceeds systemic vascular responsiveness. Fetal systemic vascular smooth muscle (VSM) exhibits an immature phenotype with decreased contractile protein contents, low 200- kDa myosin heavy chain (MHC) SM2, and significant nonmuscle MHC-B expression, whereas umbilical VSM phenotype is incompletely described. We tested the hypothesis that differences in vascular responsiveness could reflect dissimilarities in VSM phenotype. Actin, MHC, MHC isoforms, and active stresses were compared in strips of femoral arteries and aorta from near- term fetal (n = 12) and adult (n = 12) sheep to those in external and intra- abdominal umbilical arteries. Actin contents in fetal femoral artery and aorta were less (P ≤ 0.006) than in external umbilical artery (7.37 ± 1.4 and 7.53 ± 0.7 vs. 21.6 ± 2.2 μg/mg wet wt, respectively) as were MHC contents (3.17 ± 0.4 and 2.84 ± 0.3 vs. 7.16 ± 0.7, respectively). Whereas 204-and 200-kDa MHC were expressed equally in fetal systemic arteries, umbilical and adult arteries predominantly expressed the 204-kDa isoform (SM1); only fetal systemic VSM expressed MHC-B. Fetal systemic artery stresses and myosin light chain phosphorylation were less than those in umbilical and adult arteries (P < 0.001). Compared with umbilical and adult arteries, fetal systemic VSM is biochemically and functionally immature and thus umbilical VSM demonstrates precocious maturation resembling adult VSM in protein expression and function.",
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T1 - Differential development of umbilical and systemic arteries. II. Contractile proteins

AU - Arens, Yvonne

AU - Chapados, Rene A.

AU - Cox, Blair E.

AU - Kamm, Kristine E.

AU - Rosenfeld, Charles R.

PY - 1998

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N2 - In fetal sheep, umbilical responsiveness to ANG II exceeds systemic vascular responsiveness. Fetal systemic vascular smooth muscle (VSM) exhibits an immature phenotype with decreased contractile protein contents, low 200- kDa myosin heavy chain (MHC) SM2, and significant nonmuscle MHC-B expression, whereas umbilical VSM phenotype is incompletely described. We tested the hypothesis that differences in vascular responsiveness could reflect dissimilarities in VSM phenotype. Actin, MHC, MHC isoforms, and active stresses were compared in strips of femoral arteries and aorta from near- term fetal (n = 12) and adult (n = 12) sheep to those in external and intra- abdominal umbilical arteries. Actin contents in fetal femoral artery and aorta were less (P ≤ 0.006) than in external umbilical artery (7.37 ± 1.4 and 7.53 ± 0.7 vs. 21.6 ± 2.2 μg/mg wet wt, respectively) as were MHC contents (3.17 ± 0.4 and 2.84 ± 0.3 vs. 7.16 ± 0.7, respectively). Whereas 204-and 200-kDa MHC were expressed equally in fetal systemic arteries, umbilical and adult arteries predominantly expressed the 204-kDa isoform (SM1); only fetal systemic VSM expressed MHC-B. Fetal systemic artery stresses and myosin light chain phosphorylation were less than those in umbilical and adult arteries (P < 0.001). Compared with umbilical and adult arteries, fetal systemic VSM is biochemically and functionally immature and thus umbilical VSM demonstrates precocious maturation resembling adult VSM in protein expression and function.

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