Laminin isoforms and lung development: all isoforms are not equal

Developmental Biology
Nguyet M Nguyen, R M Senior

Abstract

Laminins are a major component of basement membranes. Each laminin molecule is a heterotrimeric glycoprotein composed of one alpha, one beta, and one gamma chain. Fifteen laminin isoforms exist, assembled from various combinations of 5alpha, 3beta, and 3gamma chains. The embryonic lung has abundant laminin isoforms. Increasing evidence suggests that different laminin isoforms have unique functions in lung development. Studies of embryonic lung explants and organotypic co-cultures show that laminin alpha1 and laminin 111 are important for epithelial branching morphogenesis and that laminin alpha2 and laminin 211 have a role in smooth muscle cell differentiation. In vivo studies of laminin alpha5-deficient mice indicate that this laminin chain, found in laminins 511 and 521, is essential for normal lobar septation in early lung development and normal alveolization and distal epithelial cell differentiation and maturation in late lung development. However, not all of the laminin chains present in the developing lung appear to be necessary for normal lung development since laminin alpha4 null mice do not have obvious lung abnormalities and laminin gamma2 null mice have only minimal changes in lung development. The mechanisms respon...Continue Reading

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