Vascular Smooth Muscle Cells is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Vascular smooth muscle cells (VSMCs) are specialized contractile cells lining blood vessels throughout the body. In the brain, they play critical roles in regulating cerebral blood flow, maintaining the blood-brain barrier (BBB), and contributing to neurovascular function in neurodegenerative diseases.
| Property |
Value |
| Cell Type |
Contractile cell |
| Location |
Tunica media of cerebral arteries, arterioles, and veins |
| Neurotransmitter |
None (paracrine signaling) |
| Marker Genes |
ACTA2 (α-SMA), MYH11, TAGLN (SM22), CNN1 (Calponin) |
| Allen Atlas ID |
See Brain Vascular Cell Atlas |
¶ Morphology and Markers
Vascular smooth muscle cells exhibit distinctive features:
- Soma: Spindle-shaped cell body
- Cytoskeleton: Rich in actin and myosin filaments enabling contraction
- Molecular markers:
- ACTA2 (α-smooth muscle actin) - canonical marker
- MYH11 (myosin heavy chain 11)
- TAGLN (SM22α)
- CNN1 (calponin)
- PDGFRβ (pericyte/smooth muscle progenitor marker)
VSMCs are essential for vascular homeostasis:
- Vessel tone regulation: Control cerebral blood flow through contraction/relaxation
- Blood-brain barrier maintenance: Support endothelial cell function and tight junction integrity
- Vascular remodeling: Participate in angiogenesis and vessel wall repair
- Neurovascular coupling: Respond to neuronal activity signals to adjust blood flow
VSMC dysfunction is increasingly recognized in neurodegenerative diseases:
- Cerebral amyloid angiopathy (CAA): Aβ accumulation in VSMC membranes leads to functional impairment
- Vessel stiffening: Age-related VSMC changes reduce cerebral blood flow
- Impaired autoregulation: VSMC dysfunction compromises ability to maintain constant flow
- Neurovascular dysfunction: VSMC-endothelial crosstalk disruption in AD
- Cerebrovascular changes: Reduced cerebral blood flow in PD patients
- α-Synuclein pathology: VSMCs can accumulate Lewy body-like inclusions
- Blood-brain barrier disruption: VSMC contribution to BBB leakage
¶ Vascular Cognitive Impairment and Dementia (VCID)
- Arteriosclerosis: VSMC hypertrophy and hyperplasia
- Lacunar infarcts: Small vessel disease involving VSMC dysfunction
- White matter damage: Reduced perfusion from VSMC impairment
- Vascular abnormalities: Reduced spinal cord blood flow
- Endothelial-VSMC crosstalk: Dysfunction in neuromuscular junction vasculature
- Cerebrovascular deficits: Reduced cerebral blood volume and flow
- VSMC pathology: Mutant huntingtin effects on smooth muscle function
Single-cell studies reveal VSMC subpopulations:
- Contractile VSMCs: High expression of ACTA2, MYH11, TAGLN
- Synthetic/proliferative VSMCs: Reduced contractile markers, increased ECM production
- Brain-specific VSMCs: Unique transcriptional profile compared to peripheral vasculature
- Key regulators: Klf4, Myocd, SrF for contractile phenotype
- Calcium channel blockers: Nifedipine, amlodipine for vessel relaxation
- Rho kinase inhibitors: Y-27632, fasudil for vasodilation
- Statins: Pleiotropic effects on VSMC function
- Endothelin receptor antagonists: Bosentan for vasoconstriction modulation
- Gene therapy: VEGF delivery for angiogenesis
- Cell therapy: VSMC progenitors for vascular repair
- BBB penetrant drugs: Targeting VSMC-specific pathways
- Zlokovic BV. (2011) "Neurovascular pathways to neurodegeneration in Alzheimer's disease." Nature Reviews Neuroscience. PMID:21550050
- Iadecola C. (2017) "The Neurovascular Unit Coming of Age." Stroke. PMID:28626052
- Bell RD, et al. (2010) "Pericytes control key neurovascular functions and neuronal phenotype in the adult brain and in brain disorders." Neuron. PMID:20887958
- Toth P, et al. (2021) "Mechanisms of vascular aging." Journal of Cerebral Blood Flow & Metabolism. PMID:33136112
The study of Vascular Smooth Muscle Cells has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Wagstaff LJ, et al. (2019). "Vascular smooth muscle cells in cerebral small vessel disease." Stroke. PMID:31233467
- Bath PM, et al. (2020). "Vascular cognitive impairment." Lancet Neurology. PMID:32416783