Histomorphometric and biochemical correlates of arterial procollagen gene expression during vascular repair after experimental angioplasty

M. Asad Karim, Donald D Miller, Melody A. Farrar, Elias Eleftheriades, Bouyella H. Reddy, Clyniece M. Breland, Allen M. Samarel

Research output: Contribution to journalArticle

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Abstract

Background: To determine the transcriptional, biochemical, and histomorphometric correlates of neointimal procollagen accumulation during arterial repair after balloon angioplasty of atherogenic vessels, rabbit iliac artery collagen content and the induction of α1(I) and α1(III) procollagen mRNA were assessed in normal vessels and at 2, 7, and 30 days after angioplasty. Methods and Results: Quantitative iliac artery histomorphometric neointimal collagen analysis was performed using a specific picrosirius red stain under polarized light. Arterial cross-sectional area reduction, total cellularity, and vascular smooth muscle cell density (per 104 μ2 of neointima) were quantified in routine and immunohistochemically stained sections (α-actin and RAM-11), from which biochemical concentrations of tissue protein, RNA, and DNA were also measured. Collagen comprised 0.23±0.1 mg/mg of total protein in the normal vessel wall and did not increase in vessels studied 2 and 7 days after angioplasty (0.26±0.06, 0.28±0.05 mg/mg of protein, P=NS). By 30 days after angioplasty, >50% of the protein concentration was collagen (0.55±0.11 mg/mg of protein, P=.02). Collagen-positive histological staining also increased significantly from 17±2% of the neointima at day 2 to 32±5% by day 30 (P=.01). The transcript regulatory signal for α1(I) procollagen mRNA was induced 2 days after angioplasty, peaking at 7 days for both α1(I) and α1(III), and returning to control levels 30 days after angioplasty. A significant luminal cross- sectional area reduction of the arterial wall was confirmed both by angiography and histomorphometry (P=.01). This was not associated with a significant change in α-actin (+) vascular smooth muscle cell density (38±7 nuclei per 104μ2 at day 2 and at day 30) or tissue DNA concentration (P=NS). Conclusions: We conclude that procollagen genes are transcriptionally activated early (2 to 7 days) after angioplasty vessel injury and that collagen subsequently constitutes a major biochemical and histological component of the proliferative neointima by 30 days after angioplasty. Alterations in pathways regulating procollagen metabolism may also contribute to the accumulation of extracellular matrix and growth of the neointima in the late repair phase after vessel wall injury.

Original languageEnglish (US)
Pages (from-to)2049-2057
Number of pages9
JournalCirculation
Volume91
Issue number7
DOIs
StatePublished - Apr 1 1995
Externally publishedYes

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Procollagen
Angioplasty
Blood Vessels
Neointima
Collagen
Gene Expression
Iliac Artery
Proteins
Vascular Smooth Muscle
Smooth Muscle Myocytes
Actins
Cell Count
Messenger RNA
Balloon Angioplasty
DNA
Wounds and Injuries
Extracellular Matrix
Angiography
Coloring Agents
RNA

Keywords

  • angioplasty
  • endothelium
  • genes

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

Cite this

Histomorphometric and biochemical correlates of arterial procollagen gene expression during vascular repair after experimental angioplasty. / Karim, M. Asad; Miller, Donald D; Farrar, Melody A.; Eleftheriades, Elias; Reddy, Bouyella H.; Breland, Clyniece M.; Samarel, Allen M.

In: Circulation, Vol. 91, No. 7, 01.04.1995, p. 2049-2057.

Research output: Contribution to journalArticle

Karim, M. Asad ; Miller, Donald D ; Farrar, Melody A. ; Eleftheriades, Elias ; Reddy, Bouyella H. ; Breland, Clyniece M. ; Samarel, Allen M. / Histomorphometric and biochemical correlates of arterial procollagen gene expression during vascular repair after experimental angioplasty. In: Circulation. 1995 ; Vol. 91, No. 7. pp. 2049-2057.
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title = "Histomorphometric and biochemical correlates of arterial procollagen gene expression during vascular repair after experimental angioplasty",
abstract = "Background: To determine the transcriptional, biochemical, and histomorphometric correlates of neointimal procollagen accumulation during arterial repair after balloon angioplasty of atherogenic vessels, rabbit iliac artery collagen content and the induction of α1(I) and α1(III) procollagen mRNA were assessed in normal vessels and at 2, 7, and 30 days after angioplasty. Methods and Results: Quantitative iliac artery histomorphometric neointimal collagen analysis was performed using a specific picrosirius red stain under polarized light. Arterial cross-sectional area reduction, total cellularity, and vascular smooth muscle cell density (per 104 μ2 of neointima) were quantified in routine and immunohistochemically stained sections (α-actin and RAM-11), from which biochemical concentrations of tissue protein, RNA, and DNA were also measured. Collagen comprised 0.23±0.1 mg/mg of total protein in the normal vessel wall and did not increase in vessels studied 2 and 7 days after angioplasty (0.26±0.06, 0.28±0.05 mg/mg of protein, P=NS). By 30 days after angioplasty, >50{\%} of the protein concentration was collagen (0.55±0.11 mg/mg of protein, P=.02). Collagen-positive histological staining also increased significantly from 17±2{\%} of the neointima at day 2 to 32±5{\%} by day 30 (P=.01). The transcript regulatory signal for α1(I) procollagen mRNA was induced 2 days after angioplasty, peaking at 7 days for both α1(I) and α1(III), and returning to control levels 30 days after angioplasty. A significant luminal cross- sectional area reduction of the arterial wall was confirmed both by angiography and histomorphometry (P=.01). This was not associated with a significant change in α-actin (+) vascular smooth muscle cell density (38±7 nuclei per 104μ2 at day 2 and at day 30) or tissue DNA concentration (P=NS). Conclusions: We conclude that procollagen genes are transcriptionally activated early (2 to 7 days) after angioplasty vessel injury and that collagen subsequently constitutes a major biochemical and histological component of the proliferative neointima by 30 days after angioplasty. Alterations in pathways regulating procollagen metabolism may also contribute to the accumulation of extracellular matrix and growth of the neointima in the late repair phase after vessel wall injury.",
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T1 - Histomorphometric and biochemical correlates of arterial procollagen gene expression during vascular repair after experimental angioplasty

AU - Karim, M. Asad

AU - Miller, Donald D

AU - Farrar, Melody A.

AU - Eleftheriades, Elias

AU - Reddy, Bouyella H.

AU - Breland, Clyniece M.

AU - Samarel, Allen M.

PY - 1995/4/1

Y1 - 1995/4/1

N2 - Background: To determine the transcriptional, biochemical, and histomorphometric correlates of neointimal procollagen accumulation during arterial repair after balloon angioplasty of atherogenic vessels, rabbit iliac artery collagen content and the induction of α1(I) and α1(III) procollagen mRNA were assessed in normal vessels and at 2, 7, and 30 days after angioplasty. Methods and Results: Quantitative iliac artery histomorphometric neointimal collagen analysis was performed using a specific picrosirius red stain under polarized light. Arterial cross-sectional area reduction, total cellularity, and vascular smooth muscle cell density (per 104 μ2 of neointima) were quantified in routine and immunohistochemically stained sections (α-actin and RAM-11), from which biochemical concentrations of tissue protein, RNA, and DNA were also measured. Collagen comprised 0.23±0.1 mg/mg of total protein in the normal vessel wall and did not increase in vessels studied 2 and 7 days after angioplasty (0.26±0.06, 0.28±0.05 mg/mg of protein, P=NS). By 30 days after angioplasty, >50% of the protein concentration was collagen (0.55±0.11 mg/mg of protein, P=.02). Collagen-positive histological staining also increased significantly from 17±2% of the neointima at day 2 to 32±5% by day 30 (P=.01). The transcript regulatory signal for α1(I) procollagen mRNA was induced 2 days after angioplasty, peaking at 7 days for both α1(I) and α1(III), and returning to control levels 30 days after angioplasty. A significant luminal cross- sectional area reduction of the arterial wall was confirmed both by angiography and histomorphometry (P=.01). This was not associated with a significant change in α-actin (+) vascular smooth muscle cell density (38±7 nuclei per 104μ2 at day 2 and at day 30) or tissue DNA concentration (P=NS). Conclusions: We conclude that procollagen genes are transcriptionally activated early (2 to 7 days) after angioplasty vessel injury and that collagen subsequently constitutes a major biochemical and histological component of the proliferative neointima by 30 days after angioplasty. Alterations in pathways regulating procollagen metabolism may also contribute to the accumulation of extracellular matrix and growth of the neointima in the late repair phase after vessel wall injury.

AB - Background: To determine the transcriptional, biochemical, and histomorphometric correlates of neointimal procollagen accumulation during arterial repair after balloon angioplasty of atherogenic vessels, rabbit iliac artery collagen content and the induction of α1(I) and α1(III) procollagen mRNA were assessed in normal vessels and at 2, 7, and 30 days after angioplasty. Methods and Results: Quantitative iliac artery histomorphometric neointimal collagen analysis was performed using a specific picrosirius red stain under polarized light. Arterial cross-sectional area reduction, total cellularity, and vascular smooth muscle cell density (per 104 μ2 of neointima) were quantified in routine and immunohistochemically stained sections (α-actin and RAM-11), from which biochemical concentrations of tissue protein, RNA, and DNA were also measured. Collagen comprised 0.23±0.1 mg/mg of total protein in the normal vessel wall and did not increase in vessels studied 2 and 7 days after angioplasty (0.26±0.06, 0.28±0.05 mg/mg of protein, P=NS). By 30 days after angioplasty, >50% of the protein concentration was collagen (0.55±0.11 mg/mg of protein, P=.02). Collagen-positive histological staining also increased significantly from 17±2% of the neointima at day 2 to 32±5% by day 30 (P=.01). The transcript regulatory signal for α1(I) procollagen mRNA was induced 2 days after angioplasty, peaking at 7 days for both α1(I) and α1(III), and returning to control levels 30 days after angioplasty. A significant luminal cross- sectional area reduction of the arterial wall was confirmed both by angiography and histomorphometry (P=.01). This was not associated with a significant change in α-actin (+) vascular smooth muscle cell density (38±7 nuclei per 104μ2 at day 2 and at day 30) or tissue DNA concentration (P=NS). Conclusions: We conclude that procollagen genes are transcriptionally activated early (2 to 7 days) after angioplasty vessel injury and that collagen subsequently constitutes a major biochemical and histological component of the proliferative neointima by 30 days after angioplasty. Alterations in pathways regulating procollagen metabolism may also contribute to the accumulation of extracellular matrix and growth of the neointima in the late repair phase after vessel wall injury.

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