title: Monoclonal antibody 2H1 detects a 60-65 KD membrane polypeptide of the rough endoplasmic reticulum of neurons and selectively stains cells of several rat tissues.
abstract: Monoclonal antibody (MAb) 2H1, raised in mice immunized with membrane fractions from cultured rat pheochromocytoma cells (clonal line PC-12), detects a polypeptide from rat brain and PC-12 cell membranes of 60-65 KD apparent molecular mass. The polypeptide has been localized by immunoelectron microscopy in the rough endoplasmic reticulum (RER) of neurons. By light microscopic immunocytochemistry, several rat tissues and two rat-derived cultured cell types show selective patterns of staining with 2H1. In the central nervous system, the antibody stains neuronal cytoplasm; in the spleen, staining is seen only in certain cells of the marginal zone of the white pulp, and in lymph nodes, in plasma cells, and in areas populated by monocytes and macrophages. Whereas astrocytes and adrenal medullary cells in situ are virtually unstained with 2H1, primary cultures of astrocytes and PC-12 cells, which are derived from adrenal medullary cells, stain intensely with 2H1. The strong staining of cultured astrocytes and PC-12 cells with 2H1 suggests that the levels of the 60-65 KD polypeptide are up-regulated during cell proliferation and growth. Only a few hepatocytes stain with 2H1; intestinal epithelial and pancreatic cells are not stained with 2H1. The organelle-specific antibody 2H1 may prove a useful probe in structural and functional studies of membranes of the rough endoplasmic reticulum in neurons, and in certain cells of the immune system.
authors.affiliation: Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Chen
authors.forename: W F
authors.initials: WF
authors.lastname: Hickey
authors.forename: S G
authors.initials: SG
authors.lastname: Mezitis
authors.forename: A
authors.initials: A
authors.lastname: Stieber
authors.forename: E
authors.initials: E
authors.lastname: Lavi
authors.forename: J O
authors.initials: JO
authors.lastname: Gonatas
authors.forename: N K
authors.initials: NK
authors.lastname: Gonatas
mesh_terms: D000310:Adrenal Gland Neoplasms / Q000378:metabolism / Q000473:pathology* / Q000648:ultrastructure; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D001253:Astrocytes / Q000378:metabolism / Q000502:physiology / Q000648:ultrastructure; D001921:Brain / Q000378:metabolism / Q000502:physiology / Q000648:ultrastructure; D002460:Cell Line; D002462:Cell Membrane / Q000378:metabolism / Q000502:physiology / Q000648:ultrastructure; D004721:Endoplasmic Reticulum / Q000378:metabolism* / Q000502:physiology / Q000648:ultrastructure; D007150:Immunohistochemistry / Q000379:methods; D008198:Lymph Nodes / Q000166:cytology* / Q000378:metabolism / Q000648:ultrastructure; D008565:Membrane Proteins / Q000276:immunology / Q000378:metabolism*; D016253:Microscopy, Immunoelectron; D008970:Molecular Weight; D009474:Neurons / Q000378:metabolism* / Q000502:physiology / Q000648:ultrastructure; D010673:Pheochromocytoma / Q000378:metabolism / Q000473:pathology* / Q000648:ultrastructure; D010950:Plasma Cells / Q000166:cytology / Q000378:metabolism / Q000648:ultrastructure; D051381:Rats; D011917:Rats, Inbred Lew; D013154:Spleen / Q000166:cytology / Q000378:metabolism / Q000648:ultrastructure
chemical_list: D000911:Antibodies, Monoclonal; D008565:Membrane Proteins