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High ratio of HTLV-1-infected cells in HTLV-1 associated myelopathy (HAM)
M Nishimura1, A Adachi, I Akiguchi
1Department of Neurology, Kyoto University, Osaka, Japan.
Abstract:
Sixteen patients with HTLV-1 associated myelopathy (HAM) were examined for the presence of HTLV-1 provirus genome by Southern blot analysis of genomic DNA from peripheral blood mononuclear (PBM) cells. Random integration of the provirus was detected in 14 of 16 HAM patients. By contrast, the provirus genome could not be detected in 6 non-HAM HTLV-1 carriers, HAM patients were found to have significantly higher antibody titer to HTLV-1 in the sera compared with carriers. These features of HAM patients, i.e., detectable levels of provirus integration in PBM cells and high antibody titer to HTLV-1 in the sera, were noted in 2 wives of HAM patients with neurological signs and abnormalities. High anti-HTLV-1 antibody titer and detection of the provirus genome by Southern hybridizations may be useful for screening subclinical HAM cases and elucidating pathogenesis.
Insights
Human T-lymphotropic virus type 1 (HTLV-1) associated myelopathy (HAM) patients show detectable provirus integration in peripheral blood mononuclear cells and high antibody titers. These findings aid in screening for subclinical HAM cases.
Area of Science:
- Virology
- Immunology
- Neurology
Background:
- Human T-lymphotropic virus type 1 (HTLV-1) infection is linked to neurological disorders.
- HTLV-1 associated myelopathy (HAM) is a progressive neurological condition.
Purpose of the Study:
- To investigate the presence of HTLV-1 provirus genome in HAM patients.
- To compare viral markers between HAM patients and HTLV-1 carriers.
- To explore potential markers for subclinical HAM cases.
Main Methods:
- Southern blot analysis of genomic DNA from peripheral blood mononuclear (PBM) cells.
- Detection of HTLV-1 provirus integration.
- Measurement of anti-HTLV-1 antibody titers in serum.
Main Results:
- Random HTLV-1 provirus integration was detected in 14 of 16 HAM patients.
- Provirus genome was undetectable in 6 non-HAM HTLV-1 carriers.
- HAM patients exhibited significantly higher anti-HTLV-1 antibody titers compared to carriers.
- Two wives of HAM patients with neurological signs showed similar viral markers.
Conclusions:
- Detectable provirus integration in PBM cells and high anti-HTLV-1 antibody titers are characteristic of HAM patients.
- These markers may be valuable for screening subclinical HAM cases.
- Further research can elucidate the pathogenesis of HAM.