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1 Thoracic Surgery Research Laboratory, University Health Network, Toronto General Hospital, Toronto M5G 2C4; and 2 Lung Biology Program, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada M5G 1X8
Growth and maturation of fetal lungs are regulated by both humoral and physical factors. Mechanical stretch stimulates fetal lung cell proliferation and affects fetal lung maturation by influencing the production of extracellular matrix molecules and the expression of specific genes of fetal lung cells. These effects are mediated through special signal transduction pathways in fetal lung cells. Various in vivo and in vitro model systems have been developed to investigate the mechanotransduction process. The diversity and discrepancy of these studies have raised many questions. We will briefly summarize mechanical force-induced signals in fetal lung cell proliferation and differentiation and then discuss several important issues related to these studies.
mechanotransduction; proliferation; differentiation; maturation; intracellular signaling
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