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Programmed neuronal cell death induced by HIV-1 tat and methamphetamine
Li Qi1, Lu Gang, Kwong Wing Hang
1Department of Psychiatry, University of Hong Kong, 21 Sasson Roads, Pokfulam, Hong Kong Special Administrative Region, China.
Microscopy Research and Technique
|May 13, 2011
Summary
Methamphetamine and HIV Tat protein together cause significant neuronal damage through programmed cell death pathways, involving both apoptosis and autophagy. This combined effect exacerbates neurotoxicity more than either substance alone.
Area of Science:
- Neuroscience
- Cell Biology
- Toxicology
Background:
- Programmed cell death (PCD) in neurons involves apoptosis and autophagy.
- HIV-infected methamphetamine (Meth) abusers exhibit severe neuropathology.
- Combined Tat (HIV protein) and Meth administration increases neuronal damage.
Purpose of the Study:
- Investigate the roles of apoptosis and autophagy in neuronal damage induced by Tat and/or Meth.
- Characterize the cellular events underlying combined Tat-Meth neurotoxicity.
Main Methods:
- Utilized Annexin-V-FITC/PI staining assay to detect apoptosis in SH-SY5Y neuroblastoma cells.
- Employed transmission electron microscopy (TEM) to observe cellular ultrastructural changes.
- Analyzed flow-cytometric data to quantify apoptotic cells.
Main Results:
- Meth treatment induced apoptosis; Tat + Meth treatment resulted in more extensive apoptosis.
- Autophagosome and multilamellar body (MLB) formation was most pronounced with Tat + Meth treatment.
- Tat treatment alone showed infrequent autophagosome/MLB formation.
Conclusions:
- Both apoptosis and autophagy are implicated in Tat and Meth-induced neuronal damage.
- The combined Tat-Meth effect significantly enhances neurotoxicity via PCD pathways.
- Further research is required to clarify the interplay between apoptosis and autophagy in this context.
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