In vivo modulated N-acyl side chain of N-acetylneuraminic acid modulates the cell contact-dependent inhibition of growth.
Sialylation of plasma membrane glycoproteins is thought to be involved in the regulation of differentiation and in the process of tumorigenesis. Here we show that sialylation also affects cell-cell contact-dependent growth regulation. When cultured in the presence of non-physiological synthetic sialic acid precursors, human diploid fibroblasts no longer exhibited density-dependent inhibition of growth. Concomitantly, increased sialylation of contactinhibin, a glycoprotein involved in density-dependent inhibition of growth, was observed. These results indicate that sialidase-resistant sialic acid modifications lead to dysregulated growth control. The modifications have been induced by N-propanoyl and other N-acyl derivatives of D-mannosamine.
Institut für Toxikologie, Mainz, Germany. wieser@vzdmzy.zdv.uni-mainz.de
J R
JR
Wieser
A
A
Heisner
P
P
Stehling
F
F
Oesch
W
W
Reutter
D002455:Cell Division / Q000187:drug effects / Q000502:physiology*; D002462:Cell Membrane / Q000187:drug effects / Q000502:physiology; D002478:Cells, Cultured; D003260:Contact Inhibition / Q000187:drug effects / Q000502:physiology*; D005347:Fibroblasts; D006801:Humans; D007700:Kinetics; D008168:Lung; D008562:Membrane Glycoproteins / Q000378:metabolism; D019158:N-Acetylneuraminic Acid / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology*; D011956:Receptors, Cell Surface / Q000502:physiology*
D008562:Membrane Glycoproteins; D011956:Receptors, Cell Surface; C096196:contactinhibin receptor; D019158:N-Acetylneuraminic Acid