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C-CAM (cell-CAM 105...
C-CAM (cell-CAM 105) is an adhesive cell surface glycoprotein with homophilic binding properties
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- Tingström, Anders (author)
- Lund University,Lunds universitet,Enheten för psykiatrisk neuromodulering (PNU),Forskargrupper vid Lunds universitet,Psychiatric Neuromodulation Unit (PNU),Lund University Research Groups
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Blikstad, Ingrid (author)
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- Aurivillius, Magnus (author)
- Lund University,Lunds universitet,Preventiv pediatrik,Forskargrupper vid Lunds universitet,Preventive Paediatrics,Lund University Research Groups
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Obrink, Björn (author)
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(creator_code:org_t)
- 1990
- 1990
- English.
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In: Journal of Cell Science. - 0021-9533. ; 96:1, s. 17-25
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http://jcs.biologist... (free)
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Abstract
Subject headings
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- C-CAM (Cell-CAM 105) is a cell surface glycoprotein that is involved in cell-cell adhesion of rat hepatocytes in vitro. To elucidate the adhesion mechanism the binding properties of purified C-CAM were investigated. Using proteins immobilized on nitrocellulose it was found that radiolabeled C-CAM bound to C-CAM but not to a variety of other proteins. Partitioning in Triton X-114 showed that C-CAM has hydrophobic properties. In accordance with this, C-CAM was effectively incorporated into phosphatidylcholine liposomes by dialysis from octylglucoside-containing solutions. The C-CAM-containing liposomes bound specifically to isolated hepatocytes. This binding was blocked by Fab fragments of anti-C-CAM antibodies. Furthermore, preincubation of hepatocytes with anti-C-CAM antibodies followed by washing of the cells blocked binding of C-CAM-containing liposomes. At increasing C-CAM contents in the reconstituted liposomes a marked self-aggregation of the liposomes occurred. This aggregation was blocked by Fab fragments of anti-C-CAM antibodies and by alkaline pH. After neutralization a rapid reaggregation occurred. Neither C-CAM binding to C-CAM immobilized on nitrocellulose nor C-CAM-liposome aggregation required calcium ions. Liposomes reconstituted with C-CAM-depleted membrane glycoproteins did not self-aggregate or bind to hepatocytes. Thus, it is concluded that C-CAM can bind specifically to C-CAM in a homophilic binding reaction that does not require calcium. Accordingly, C-CAM has the potential of directly mediating cell-cell adhesion via C-CAM-C-CAM binding between adjacent cells.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Pediatrik (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Pediatrics (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Psykiatri (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Psychiatry (hsv//eng)
Keyword
- glycoprotein
- adhesion
- C-CAM
Publication and Content Type
- art (subject category)
- ref (subject category)
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