Endogenous Muscle Lectin Inhibits Myoblast Adhesion to Laminin

L-14, a dimeric lactose-binding lectin with subunits of 14 kD, is expressed in a wide range of vertebrate tissues. Several functions have been postulated for this lectin, but definitive evidence for a specific biological role has been elusive. In muscle, L-14 is secreted during differentiation and a...

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Published inThe Journal of cell biology Vol. 115; no. 5; pp. 1437 - 1448
Main Authors Douglas N. W. Cooper, Massa, Stephen M., Barondes, Samuel H.
Format Journal Article
LanguageEnglish
Published United States Rockefeller University Press 01.12.1991
The Rockefeller University Press
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Abstract L-14, a dimeric lactose-binding lectin with subunits of 14 kD, is expressed in a wide range of vertebrate tissues. Several functions have been postulated for this lectin, but definitive evidence for a specific biological role has been elusive. In muscle, L-14 is secreted during differentiation and accumulates with laminin in basement membrane surrounding each myofiber. Here we present evidence that laminin is a major glycoprotein ligand for L-14 in differentiating mouse C2C12 muscle cells and that binding of secreted L-14 to polylactosamine oligosaccharides of substrate laminin induces loss of cell-substratum adhesion. These results suggest that one function of L-14 is to regulate myoblast detachment from laminin during differentiation and fusion into tubular myofibers.
AbstractList L-14, a dimeric lactose-binding lectin with subunits of 14 kD, is expressed in a wide range of vertebrate tissues. Several functions have been postulated for this lectin, but definitive evidence for a specific biological role has been elusive. In muscle, L-14 is secreted during differentiation and accumulates with laminin in basement membrane surrounding each myofiber. Here we present evidence that laminin is a major glycoprotein ligand for L-14 in differentiating mouse C2C12 muscle cells and that binding of secreted L-14 to polylactosamine oligosaccharides of substrate laminin induces loss of cell-substratum adhesion. These results suggest that one function of L-14 is to regulate myoblast detachment from laminin during differentiation and fusion into tubular myofibers.
L-14, a dimeric lactose-binding lectin with subunits of 14 kD, is expressed in a wide range of vertebrate tissues. Several functions have been postulated for this lectin, but definitive evidence for a specific biological role has been elusive. In muscle, L-14 is secreted during differentiation and accumulates with laminin in basement membrane surrounding each myofiber. Here we present evidence that laminin is a major glycoprotein ligand for L-14 in differentiating mouse C2C12 muscle cells and that binding of secreted L-14 to polylactosamine oligosaccharides of substrate laminin induces loss of cell-substratum adhesion.
Author Massa, Stephen M.
Barondes, Samuel H.
Douglas N. W. Cooper
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  surname: Barondes
  fullname: Barondes, Samuel H.
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Snippet L-14, a dimeric lactose-binding lectin with subunits of 14 kD, is expressed in a wide range of vertebrate tissues. Several functions have been postulated for...
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SubjectTerms Animals
Cell Adhesion
Cell Differentiation
Cell lines
Cells
Cells, Cultured
Glycoconjugates
Glycoproteins - metabolism
Immunohistochemistry
laminin
Laminin - metabolism
Lectins
Lectins - physiology
Ligands
Mice
Muscle fibers
Muscles
Muscles - cytology
Muscles - metabolism
Myoblasts
Recombinant Proteins - physiology
Secretion
Transfection
Title Endogenous Muscle Lectin Inhibits Myoblast Adhesion to Laminin
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