Microtubule Collapse and Disease: Neurodegeneration, Cancer, Ciliopathies, and Genetic Disorders

Microtubules (α/β-tubulin polymers) are dynamic cytoskeletal highways. Their collapse disrupts essential cellular processes.

Disease Mechanisms

Therapeutic Targeting

• MT-stabilizing agents (epothilones, nasutin) in trials for tauopathies.
• MT-destabilizing agents (vincristine, vinorelbine) standard in lymphomas, breast, lung.
• IFB-088 (anti-calpain) protects MTs in ALS models.

Key Insight

Microtubule integrity is non-negotiable for neuronal longevity, mitotic fidelity, and ciliary signaling. Collapse is a final common pathway in diverse diseases.

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Disease Group	Microtubule Defect	Examples
Neurodegenerative	Impaired axonal transport (kinesin/dynein) → protein aggregation, synaptic loss	Alzheimer's (tau hyperphosphorylation detaches from MTs), Parkinson's (α-synuclein), ALS (TDP-43, SOD1), tauopathies (FTDP-17: MAPT mutations)
Cancer	Mitotic spindle failure → aneuploidy; or targeted by chemo (taxanes, vinca alkaloids)	Paclitaxel stabilizes MTs → mitotic arrest; vincristine destabilizes → spindle collapse
Ciliopathies	Defective ciliary axoneme (9+2 MT doublets) or intraflagellar transport	Primary ciliary dyskinesia (PCD), polycystic kidney disease, Bardet-Biedl, Joubert syndrome
Genetic MT disorders	Tubulinopathies (TUBA1A, TUBB2B, TUBB3 mutations)	Cortical malformations (lissencephaly, polymicrogyria), CFEOM (TUBB3)
Cystic Fibrosis (secondary)	CFTR loss → dehydrated mucus → ciliary dysfunction (not primary MT defect)	Included for completeness; primary defect is ion channel