How HIV Disrupts Homeostasis: Immune, Neurologic, Metabolic & Organ Effects

HIV targets CD4⁺ T helper cells, the orchestrators of adaptive immunity. Progressive depletion causes systemic homeostatic failure across multiple domains:

1. Immune Collapse

• Loss of CD4⁺ cells → impaired B-cell help, cytotoxic T-cell activation, macrophage function.
• Opportunistic infections (PCP, TB, toxo, CMV, MAC, fungal) and malignancies (KS, NHL, cervical cancer).

2. Neurocognitive Disorders (HAND)

• HIV crosses BBB → infects microglia/astrocytes → neuroinflammation.
• Spectrum: asymptomatic neurocognitive impairment → mild neurocognitive disorder → HIV-associated dementia.

3. Wasting Syndrome

• Involuntary weight loss >10% + diarrhea/fever/weakness >30 days.
• Driven by cytokine dysregulation (TNF-α, IL-1), hypogonadism, malabsorption.

4. Cardiovascular Disease

• Chronic inflammation → endothelial dysfunction, accelerated atherosclerosis.
• ART metabolic effects (dyslipidemia, insulin resistance).
• Increased MI, stroke, PAD risk.

5. Kidney Disease

• HIV-associated nephropathy (HIVAN) – collapsing FSGS, especially in Black patients.
• ART nephrotoxicity (tenofovir, atazanavir).

6. Malignancies

• KS (HHV-8), NHL (EBV), cervical/anal cancer (HPV), hepatocellular carcinoma (HBV/HCV coinfection).

ART Restores Homeostasis

Suppressive ART (undetectable viral load) → CD4 recovery → immune reconstitution → dramatically reduces all above complications. U=U (Undetectable = Untransmittable).