Cardiac fibroblasts require focal adhesion kinase for normal proliferation and migration

Ana Maria Manso, seokmin kang, Sergey V. Plotnikov, Ingo Thievessen, Jaewon Oh, Hilary E. Beggs, Robert S. Ross

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Migration and proliferation of cardiac fibroblasts (CFs) play an important role in the myocardial remodeling process. While many factors have been identified that regulate CF growth and migration, less is known about the signaling mechanisms involved in these processes. Here, we utilized Cre-LoxP technology to obtain focal adhesion kinase (FAK)-deficient adult mouse CFs and studied how FAK functioned in modulating cell adhesion, proliferation, and migration of these cells. Treatment of FAK flox/flox CFs with Ad/Cre virus caused over 70% reduction of FAK protein levels within a cell population. FAK-deficient CFs showed no changes in focal adhesions, cell morphology, or protein expression levels of vinculin, talin, or paxillin; proline-rich tyrosine kinase 2 (Pyk2) expression and activity were increased. Knockdown of FAK protein in CFs increased PDGF-BB-induced proliferation, while it reduced PDGF- BB-induced migration. Adhesion to fibronectin was not altered. To distinguish between the function of FAK and Pyk2, FAK function was inhibited via adenoviral-mediated overexpression of the natural FAK inhibitor FAK-related nonkinase (FRNK). Ad/FRNK had no effect on Pyk2 expression, inhibited the PDGF-BB-induced migration, but did not change the PDGF-BB-induced proliferation. FAK deficiency had only modest effects on increasing PDGF-BB activation of p38 and JNK MAPKs, with no alteration in the ERK response vs. control cells. These results demonstrate that FAK is required for the PDGF-BB-induced migratory response of adult mouse CFs and suggest that FAK could play an essential role in the wound-healing response that occurs in numerous cardiac pathologies.

Original languageEnglish
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume296
Issue number3
DOIs
Publication statusPublished - 2009 Mar 1

Fingerprint

Focal Adhesion Protein-Tyrosine Kinases
Fibroblasts
Focal Adhesion Kinase 2
Talin
Paxillin
Vinculin
Proteins
Focal Adhesions
p38 Mitogen-Activated Protein Kinases
Fibronectins
Cell Adhesion
Wound Healing
Cell Movement
platelet-derived growth factor BB

All Science Journal Classification (ASJC) codes

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

Cite this

Manso, Ana Maria ; kang, seokmin ; Plotnikov, Sergey V. ; Thievessen, Ingo ; Oh, Jaewon ; Beggs, Hilary E. ; Ross, Robert S. / Cardiac fibroblasts require focal adhesion kinase for normal proliferation and migration. In: American Journal of Physiology - Heart and Circulatory Physiology. 2009 ; Vol. 296, No. 3.
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Cardiac fibroblasts require focal adhesion kinase for normal proliferation and migration. / Manso, Ana Maria; kang, seokmin; Plotnikov, Sergey V.; Thievessen, Ingo; Oh, Jaewon; Beggs, Hilary E.; Ross, Robert S.

In: American Journal of Physiology - Heart and Circulatory Physiology, Vol. 296, No. 3, 01.03.2009.

Research output: Contribution to journalArticle

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AU - Manso, Ana Maria

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AU - Plotnikov, Sergey V.

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AU - Beggs, Hilary E.

AU - Ross, Robert S.

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AB - Migration and proliferation of cardiac fibroblasts (CFs) play an important role in the myocardial remodeling process. While many factors have been identified that regulate CF growth and migration, less is known about the signaling mechanisms involved in these processes. Here, we utilized Cre-LoxP technology to obtain focal adhesion kinase (FAK)-deficient adult mouse CFs and studied how FAK functioned in modulating cell adhesion, proliferation, and migration of these cells. Treatment of FAK flox/flox CFs with Ad/Cre virus caused over 70% reduction of FAK protein levels within a cell population. FAK-deficient CFs showed no changes in focal adhesions, cell morphology, or protein expression levels of vinculin, talin, or paxillin; proline-rich tyrosine kinase 2 (Pyk2) expression and activity were increased. Knockdown of FAK protein in CFs increased PDGF-BB-induced proliferation, while it reduced PDGF- BB-induced migration. Adhesion to fibronectin was not altered. To distinguish between the function of FAK and Pyk2, FAK function was inhibited via adenoviral-mediated overexpression of the natural FAK inhibitor FAK-related nonkinase (FRNK). Ad/FRNK had no effect on Pyk2 expression, inhibited the PDGF-BB-induced migration, but did not change the PDGF-BB-induced proliferation. FAK deficiency had only modest effects on increasing PDGF-BB activation of p38 and JNK MAPKs, with no alteration in the ERK response vs. control cells. These results demonstrate that FAK is required for the PDGF-BB-induced migratory response of adult mouse CFs and suggest that FAK could play an essential role in the wound-healing response that occurs in numerous cardiac pathologies.

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