Ultrastructural changes associated with peripheral neuropathy in HIV/AIDS.

Area of Science:

• Neuropathology
• Virology
• Immunology

Background:

• Neurological complications are common in HIV-seropositive individuals.
• Peripheral neuropathy, including axonal injury and demyelination, affects a significant portion of this population.
• The role of specific vascular changes and inclusions in prognosis is under investigation.

Purpose of the Study:

• To investigate the histopathological findings in neuromuscular biopsies of HIV-seropositive patients.
• To identify potential correlations between specific pathological markers and patient outcomes, particularly survival.
• To explore the significance of capillary lesions and tubuloreticular inclusions (TRIs) in HIV-associated neuropathy.

Main Methods:

• Light and electron microscopy were used to examine neuromuscular biopsy specimens from 12 HIV-seropositive patients.
• Patients included those with acquired immune deficiency syndrome (AIDS), AIDS-related complex, and asymptomatic neuropathy.
• Histopathological features, including axonal injury, demyelination, peripheral neurogenic atrophy, capillary lesions, and TRIs, were analyzed.

Main Results:

• All patients exhibited axonal injury, with or without demyelination and peripheral neurogenic atrophy.
• Consistent capillary lesions were observed, identified as a novel finding.
• Tubuloreticular inclusions (TRIs) were present in endomysial and endoneurial vessels in a majority of cases.
• A higher percentage of TRIs (>20%) in endomysial vessels correlated significantly with a survival time shorter than 12 months (P = 0.028).

Conclusions:

• HIV-associated neuropathy involves axonal injury and previously unrecognized capillary lesions.
• The presence and quantification of TRIs in endomysial vessels are significant prognostic indicators.
• TRIs may serve as a vital prognostic element for survival in HIV-seropositive patients with neurological involvement.