Under normal growth conditions, in vitro dermal microvascular endothelial cells (HDMEC) retain an epithelioid morphology and do not synthesize matrix proteins found increased in scar tissue. When injured by a standard scratch, cells at the wound edge and within the culture transform into spindle-shaped, myofibroblast-like cells. To determine if the transformed cells synthesize matrix proteins, expression of type I collagen and alpha smooth muscle actin (α-SMA) was investigated by immunohistochemistry and quantitative reverse transcriptase-polymerase chain reaction (RT-PCR). Twelve hours following injury, a major upregulation in expression of α-SMA and type I collagen was observed both in cells proximal and distal to the wound edge. Cells with the typical morphology of myofibroblasts and displaying intracellular α-SMA positive fibrils were observed in HDMEC throughout the culture. In contrast, type IV collagen, a basement membrane protein, was not detected in migrating cells. Following completion of wound repair (24–36 h), type I collagen was no longer expressed and type IV collagen synthesis increased to prewound levels. Quantitative RT-PCR confirmed the changes in gene expression for both type I collagen and α-SMA at each time point during repair. These results demonstrate that normal skin microvascular endothelial cells retain an ability to transform into myofibroblast-like cells when injured and to synthesize matrix proteins not expressed in noninjured cells. The synthesis of matrix proteins by injured endothelial cells suggests a direct role for the endothelium in the pathology of scar formation.
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1 November 2006
MECHANISMS OF MICROVASCULAR WOUND REPAIR II. INJURY INDUCES TRANSFORMATION OF ENDOTHELIAL CELLS INTO MYOFIBROBLASTS AND THE SYNTHESIS OF MATRIX PROTEINS
VAISHALI CHAUDHURI,
MARVIN A. KARASEK
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In Vitro Cellular & Developmental Biology - Animal
Vol. 42 • No. 10
November 2006
Vol. 42 • No. 10
November 2006
alpha smooth muscle actin
Endothelial
reendothelialization
scars
type I collagen