title: Cold preservation of nerve grafts decreases expression of ICAM-1 and class II MHC antigens.
abstract: Cold preservation has previously been shown to decrease the antigenicity of nerve allografts, while Schwann cells remain viable. The expression of intercellular adhesion molecule-1 (ICAM-1) and class II MHC antigens, both of which have been shown to play a major role in initiating graft rejection, was studied in fresh rat nerve, and after 2 and 7 weeks of cold preservation. Ten sciatic nerves harvested from Lewis rats were cut into three segments. One segment was processed immediately, while the other ones were preserved at 5 degrees C for 2 and 7 weeks, respectively, before processing. Immunostains using specific monoclonal antibodies and alkaline phosphatase development were performed on each sample. The relative level of expression of these antigens was compared using computer-assisted densitometry. Expression of ICAM-1 was significantly decreased at 7 weeks, as compared to fresh and 2-week groups, with no statistically significant difference between fresh and 2-week nerves. Expression of class II MHC was significantly decreased at 2 and 7 weeks, compared to fresh nerves, with no statistically significant difference between the preserved groups. The decrease in antigenicity of cold-preserved nerve allografts appears to be linked to a down-regulation of ICAM-1 and MHC class II expression.
authors.affiliation: Department of Surgery, Washington University School of Medicine, St. Louis, Missouri, USA.
authors.forename: A
authors.initials: A
authors.lastname: Atchabahian
authors.forename: S E
authors.initials: SE
authors.lastname: Mackinnon
authors.forename: D A
authors.initials: DA
authors.lastname: Hunter
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D015925:Cryopreservation; D004195:Disease Models, Animal; D005802:Genes, MHC Class II / Q000276:immunology*; D006085:Graft Survival / Q000276:immunology*; D018799:Intercellular Adhesion Molecule-1 / Q000032:analysis*; D016067:Nerve Transfer; D051381:Rats; D011917:Rats, Inbred Lew; D017207:Rats, Sprague-Dawley; D012584:Sciatic Nerve / Q000276:immunology* / Q000637:transplantation; D012680:Sensitivity and Specificity
chemical_list: D018799:Intercellular Adhesion Molecule-1