title: Effect of heat and fresh human serum on the infectivity of human T-cell lymphotropic virus type III evaluated with new bioassay systems.
abstract: MT-4 cells, which are a human T-cell lymphotropic virus type I (HTLV-I)-positive cell line highly permissive to HTLV-III infection, were used to detect the biologically active virus. For quantitation of the virus, induction of HTLV-III-specific antigen(s) and inhibition of DNA synthesis in infected MT-4 cells were assessed by indirect immunofluorescence and by a proliferation assay measuring [3H]thymidine uptake, respectively. HTLV-III was fully inactivated by treatment at 56 degrees C for 30 min. It was not inactivated by treatment with fresh anti-HTLV-III-negative serum. Thus, these assay systems with MT-4 cells would be useful in further studies on acquired immune deficiency syndrome.
mesh_terms: D001681:Biological Assay / Q000379:methods*; D001769:Blood / Q000382:microbiology; D002460:Cell Line; D003165:Complement System Proteins; D003588:Cytopathogenic Effect, Viral; D017977:Deltaretrovirus / Q000302:isolation & purification*; D005069:Evaluation Studies as Topic; D006358:Hot Temperature; D006801:Humans; D008213:Lymphocyte Activation; D013601:T-Lymphocytes
chemical_list: D003165:Complement System Proteins