Promotion of neuronal cell adhesion by members of the IgLON family occurs in the absence of either support or modification of neurite outgrowth.
The IgLONs are a family of glycosyl phosphatidyl inositol-linked cell adhesion molecules which are thought to modify neurite outgrowth and may play a role in cell-cell recognition. The family consists of LAMP, OBCAM, neurotrimin/CEPU-1 and neurotractin/kilon. In this paper we report the effect of recombinant LAMP, CEPU-1 and OBCAM, and transfected cell lines expressing these molecules, on the adhesion and outgrowth of dorsal root ganglion (DRG) and sympathetic neurones. CHO cells transfected with cDNA for CEPU-1 adhered to a recombinant CEPU-1-Fc substrate. However, DRG or sympathetic neurones only adhered to CEPU-1-Fc when presented on protein A. Although DRG and sympathetic neurones express IgLONs on their surface, both types of neurones exhibited differential adhesion to CEPU-1-Fc, LAMP-Fc and OBCAM-Fc. Neither DRG nor sympathetic neurones extended neurites on a protein A/IgLON-Fc substrate and overexpression of CEPU-1-GFP in DRG neurones also failed to stimulate neurite outgrowth on an IgLON-Fc substrate. DRG neurones adhered to and extended neurites equally on transfected and non-transfected cell lines and the recombinant proteins did not modulate the outgrowth of neurones on laminin. In contrast to previous reports we suggest that IgLONs may not have a primary role in axon guidance but may be more important for cell-cell adhesion and recognition.
McNamee
Christine J
CJ
Department of Human Anatomy and Cell Biology, The University of Liverpool, Liverpool, UK.
Reed
James E
JE
Howard
Mark R
MR
Lodge
Anthony P
AP
Moss
Diana J
DJ
D000818:Animals; D030161:Avian Proteins; D016466:CHO Cells; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D002448:Cell Adhesion / Q000187:drug effects / Q000502:physiology; D015815:Cell Adhesion Molecules / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D015816:Cell Adhesion Molecules, Neuronal / Q000235:genetics / Q000378:metabolism* / Q000494:pharmacology; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D006224:Cricetinae; D058851:GPI-Linked Proteins; D005727:Ganglia, Spinal / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D015870:Gene Expression; D006801:Humans; D007141:Immunoglobulin Fc Fragments / Q000235:genetics; D007136:Immunoglobulins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D008562:Membrane Glycoproteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D016501:Neurites / Q000378:metabolism*; D009474:Neurons / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology; D013205:Staphylococcal Protein A / Q000378:metabolism; D013564:Sympathetic Nervous System / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D014162:Transfection
D030161:Avian Proteins; D002352:Carrier Proteins; D015815:Cell Adhesion Molecules; D015816:Cell Adhesion Molecules, Neuronal; D058851:GPI-Linked Proteins; D007141:Immunoglobulin Fc Fragments; D007136:Immunoglobulins; D008562:Membrane Glycoproteins; C059785:OPCML protein, human; D011993:Recombinant Fusion Proteins; D011994:Recombinant Proteins; D013205:Staphylococcal Protein A; C095362:limbic system-associated membrane protein; C102493:neural CEPU-1 protein, chicken