Tubulointerstitial nephritis antigen interacts with laminin and type IV collagen and promotes cell adhesion.
Tubulointerstitial nephritis (TIN) antigen has been recently identified as a novel basement membrane macromolecule. It consists of a single chain of 58 kDa and exhibits a restricted distribution. The interaction between TIN antigen and laminin or type IV collagen has been studied using solid-phase binding assays and found to be for both macromolecules specific, saturable, and with an affinity in the low micromolar range. In similar assays, TIN antigen did not interact with heparin. In turbidimetry assays, it was found that the presence of TIN antigen did not affect the polymerization of type IV collagen but had a concentration-dependent inhibitory effect on laminin polymerization and on preformed laminin polymers. TIN antigen was able to promote adhesion of epithelial cells derived from kidney tubules and of endothelial cells derived from aorta. The data suggest that TIN antigen may be a macromolecule of importance both for basement membrane ultrastructure and cellular adhesion.
Kalfa
T A
TA
Department of Laboratory Medicine and Pathology, University of Minnesota Medical School, Minneapolis 55455.
Thull
J D
JD
Butkowski
R J
RJ
Charonis
A S
AS
D000818:Animals; D001485:Basement Membrane / Q000378:metabolism; D002417:Cattle; D002448:Cell Adhesion / Q000187:drug effects*; D015815:Cell Adhesion Molecules / Q000302:isolation & purification / Q000378:metabolism* / Q000494:pharmacology*; D002478:Cells, Cultured; D003094:Collagen / Q000378:metabolism*; D004730:Endothelium, Vascular / Q000187:drug effects / Q000502:physiology*; D004848:Epithelium / Q000187:drug effects / Q000502:physiology; D006493:Heparin / Q000378:metabolism; D007672:Kidney Cortex / Q000378:metabolism*; D007684:Kidney Tubules / Q000187:drug effects / Q000502:physiology*; D007700:Kinetics; D007797:Laminin / Q000378:metabolism*; D008562:Membrane Glycoproteins / Q000302:isolation & purification / Q000378:metabolism* / Q000494:pharmacology*; D051379:Mice; D009391:Nephelometry and Turbidimetry; D011817:Rabbits; D034501:Telomere-Binding Proteins
D015815:Cell Adhesion Molecules; D007797:Laminin; D008562:Membrane Glycoproteins; D034501:Telomere-Binding Proteins; C490058:Tinag protein, mouse; C499083:Tinf2 protein, mouse; D006493:Heparin; D003094:Collagen