PMID- 2414848 OWN - NLM STAT- MEDLINE DCOM- 19851219 LR - 20190618 IS - 0036-8075 (Print) IS - 0036-8075 (Linking) VI - 230 IP - 4729 DP - 1985 Nov 29 TI - Amino acid homology between the encephalitogenic site of myelin basic protein and virus: mechanism for autoimmunity. PG - 1043-5 AB - Amino acid sequence homology was found between viral and host encephalitogenic protein. Immune responses were then generated in rabbits by using the viral peptide that cross-reacts with the self protein. Mononuclear cell infiltration was observed in the central nervous systems of animals immunized with the viral peptide. Myelin basic protein (MBP) is a host protein whose encephalitogenic site of ten amino acids induces experimental allergic encephalomyelitis. By computer analysis, hepatitis B virus polymerase (HBVP) was found to share six consecutive amino acids with the encephalitogenic site of rabbit MBP. Rabbits given injections of a selected eight- or ten-amino acid peptide from HBVP made antibody that reacted with the predetermined sequences of HBVP and also with native MBP. Peripheral blood mononuclear cells from the immunized rabbits proliferated when incubated with either MBP or HBVP. Central nervous system tissue taken from these rabbits had a histologic picture reminiscent of experimental allergic encephalomyelitis. Thus, viral infection may trigger the production of antibodies and mononuclear cells that cross-react with self proteins by a mechanism termed molecular mimicry. Tissue injury from the resultant autoallergic event can take place in the absence of the infectious virus that initiated the immune response. FAU - Fujinami, R S AU - Fujinami RS FAU - Oldstone, M B AU - Oldstone MB LA - eng GR - AG-04342/AG/NIA NIH HHS/United States GR - AI-07007/AI/NIAID NIH HHS/United States GR - NS-12428/NS/NINDS NIH HHS/United States PT - Comparative Study PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Science JT - Science (New York, N.Y.) JID - 0404511 RN - 0 (Myelin Basic Protein) RN - 0 (Viral Proteins) RN - EC 2.7.7.6 (DNA-Directed RNA Polymerases) SB - IM MH - Amino Acid Sequence MH - Autoimmune Diseases/immunology MH - Cross Reactions MH - *DNA-Directed RNA Polymerases/immunology MH - Encephalomyelitis, Autoimmune, Experimental/immunology/*microbiology MH - Hepatitis B virus/analysis/*immunology MH - *Myelin Basic Protein/immunology MH - *Viral Proteins/immunology EDAT- 1985/11/29 00:00 MHDA- 1985/11/29 00:01 CRDT- 1985/11/29 00:00 PHST- 1985/11/29 00:00 [pubmed] PHST- 1985/11/29 00:01 [medline] PHST- 1985/11/29 00:00 [entrez] AID - 10.1126/science.2414848 [doi] PST - ppublish SO - Science. 1985 Nov 29;230(4729):1043-5. doi: 10.1126/science.2414848.