title: Detection of P-glycoprotein with JSB-1 monoclonal antibody in B-5 fixed and paraffin-embedded cell lines and tissues.
abstract: We analyzed the expression of P-glycoprotein (Pgp) by immunohistochemistry using JSB-1 monoclonal antibody (MAb) on paraffin-embedded sections of the multi-drug resistant (MDR) (CHrC5 and CEM-VLB), and sensitive (AuxB1 and CEM) cell lines, and also in normal kidney, colon, adrenal and in kidney and colon carcinomas. After comparing the sensitivity of three different immunohistochemical techniques the peroxidase-antiperoxidase method was found to be the best. We then tested six different fixation methods. The MDR cell lines and human tissues demonstrated the strongest staining with B-5 fixative. Both MDR cell lines, but not the tissues fixed in 1% paraformaldehyde and Zamboni's fixative demonstrated weak staining. No immuno- reactivity could be detected in MDR cell lines and tissues fixed in 10% buffered or nonbuffered formalin or by the AMeX method of tissue processing. The present study clearly shows that the type of fixative is critical for the preservation of Pgp epitope recognized by JSB-1 MAb, and that B-5 fixative is expected to be equally applicable for the detection of Pgp in normal and neoplastic tissues.
authors.affiliation: Department of Pathology, College of Medicine, University of Cincinnati, Ohio 45267-0529.
authors.forename: Z P
authors.initials: ZP
authors.lastname: Pavelic
authors.forename: Z
authors.initials: Z
authors.lastname: Sever
authors.forename: R N
authors.initials: RN
authors.lastname: Fontaine
authors.forename: V V
authors.initials: VV
authors.lastname: Baker
authors.forename: J
authors.initials: J
authors.lastname: Reising
authors.forename: D M
authors.initials: DM
authors.lastname: Denton
authors.forename: L
authors.initials: L
authors.lastname: Pavelic
authors.forename: M
authors.initials: M
authors.lastname: Khalily
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000311:Adrenal Glands / Q000737:chemistry* / Q000166:cytology; D000818:Animals; D000911:Antibodies, Monoclonal; D016466:CHO Cells; D003106:Colon / Q000737:chemistry* / Q000166:cytology; D003110:Colonic Neoplasms / Q000737:chemistry* / Q000473:pathology; D006224:Cricetinae; D005404:Fixatives / Q000494:pharmacology; D006801:Humans; D007150:Immunohistochemistry; D007668:Kidney / Q000737:chemistry* / Q000166:cytology; D007680:Kidney Neoplasms / Q000737:chemistry* / Q000473:pathology; D008562:Membrane Glycoproteins / Q000032:analysis*; D016612:Paraffin Embedding; D013194:Staining and Labeling; D016610:Tissue Embedding; D014407:Tumor Cells, Cultured
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000911:Antibodies, Monoclonal; D005404:Fixatives; D008562:Membrane Glycoproteins