title: Tissue culture studies of neurofibromatosis: effects of axolemmal fragments and cyclic adenosine 3',5'-monophosphate analogues on proliferation of Schwann-like and fibroblast-like neurofibroma cells.
abstract: Six dermal neurofibromas obtained from 5 patients with neurofibromatosis were dissociated and the cells were plated on polylysine-coated glass. Two principal cell types were observed in the cultures: elongated and bipolar Schwann-like cells (SLCs), and polymorphic flattened fibroblast-like cells (FLCs). Indirect immunofluorescence demonstrated that SLCs expressed surface laminin but not surface fibronectin; FLCs expressed surface fibronectin but were only weakly positive for surface laminin. Tritiated thymidine autoradiography demonstrated that cultured SLCs proliferated slowly (labeling index, 0.7 to 4.0%), whereas FLCs divided more rapidly (labeling index, 7.5 to 26.4%). Axolemmal fragments prepared from human or rat central nervous system specimens adhered to SLCs derived from each of the 6 neurofibromas, but not to FLCs. Axolemmal fragments induced a marked proliferative response of SLCs from 2 of the 6 neurofibromas but had no effect on proliferation of SLCs from the other 4 neurofibromas or FLCs from any of the 6 neurofibromas. In one patient from whom 2 neurofibromas were obtained, SLCs from one neurofibroma responded to axolemmal fragments, while SLCs from the other did not. Treatment of the cultures with 0.1 mM cyclic adenosine 3'5'-monophosphate (cAMP) analogue, 8-bromo cAMP, caused marked inhibition of proliferation of both SLCs and FLCs derived from all 6 neurofibromas. The same concentration of another cAMP analogue, dibutyryl cAMP, inhibited proliferation of SLCs but not of FLCs.
mesh_terms: D000328:Adult; D001369:Axons / Q000502:physiology*; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D046508:Culture Techniques; D000242:Cyclic AMP / Q000031:analogs & derivatives* / Q000494:pharmacology; D005260:Female; D005347:Fibroblasts / Q000473:pathology; D006651:Histocytochemistry; D006801:Humans; D007120:Immunochemistry; D008297:Male; D008938:Mitosis / Q000187:drug effects; D009455:Neurofibroma / Q000473:pathology*; D009456:Neurofibromatosis 1 / Q000473:pathology*; D012583:Schwann Cells / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*
chemical_list: D000242:Cyclic AMP