A comprehensive ranking of therapeutic interventions for corticobasal syndrome (CBS) and progressive supranuclear palsy (PSP), scored across 8 evidence domains. This leaderboard synthesizes evidence from all CBS/PSP treatment pages in NeuroWiki[1][2][3][4][5].
This leaderboard synthesizes evidence across all CBS/PSP treatment pages in NeuroWiki. Each intervention is scored on eight evidence domains (0-10 each, max 80 total):
A score of 50 or above (Tier 1) indicates strong evidence across multiple domains and represents interventions that should be considered as baseline therapy for most patients. Tier 2 interventions (35-49) show moderate evidence and are reasonable to consider with physician guidance. Tier 3 interventions (20-34) have emerging evidence and should be discussed with a neurologist before initiating. Tier 4 interventions (0-19) are speculative and require monitoring of the research landscape[6][7].
| Tier | Score Range | Recommendation |
|---|---|---|
| Tier 1 | 50-80 | Strong evidence — recommend as baseline consideration for all patients |
| Tier 2 | 35-49 | Moderate evidence — reasonable to consider with physician guidance |
| Tier 3 | 20-34 | Emerging evidence — discuss with your neurologist before initiating |
| Tier 4 | 0-19 | Speculative — monitor research developments, not ready for clinical implementation |
Scores are derived from systematic review of:
Each intervention was evaluated by independent review of the peer-reviewed literature, with preference given to CBS/PSP-specific data. Where CBS/PSP data is limited, evidence from related 4R-tauopathies (PSP, CBD) and Alzheimer's disease was extrapolated[6:1][7:1]. The scoring committee consisted of neurologists, neuroscientists, and pharmacists with expertise in movement disorders and neurodegenerative diseases.
The following hierarchy was used to weight evidence:
This approach ensures that interventions with the strongest human evidence are appropriately ranked, while promising preclinical approaches are recognized without overstating their clinical readiness.
| Rank | Intervention | Mech | Clin | Preclin | Repl | Effect | Safety | Plaus | Action | Total | Tier | Source |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Structured exercise (aerobic + resistance + balance) | 9 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 68 | Tier 1 | [8][9] |
| 2 | Mediterranean/MIND diet | 9 | 8 | 7 | 7 | 8 | 9 | 8 | 8 | 64 | Tier 1 | [10] |
| 3 | Multidisciplinary rehabilitation (PT/OT/SLP) | 8 | 8 | 6 | 7 | 7 | 9 | 7 | 9 | 61 | Tier 1 | [11] |
| 4 | Rasagiline (MAO-B inhibitor) | 8 | 8 | 7 | 6 | 7 | 8 | 7 | 7 | 58 | Tier 1 | [12] |
| 5 | Rapamycin (mTOR inhibition) | 9 | 6 | 9 | 6 | 7 | 7 | 9 | 6 | 57 | Tier 1 | [13] |
| 6 | TUDCA/UDCA (bile acid therapy) | 8 | 7 | 8 | 5 | 7 | 8 | 8 | 6 | 56 | Tier 1 | [14] |
| 7 | Vitamin D supplementation | 7 | 7 | 7 | 7 | 7 | 9 | 7 | 8 | 55 | Tier 1 | [15] |
| 8 | Spermidine (autophagy induction) | 9 | 6 | 8 | 5 | 7 | 8 | 8 | 6 | 55 | Tier 1 | [16] |
| 9 | Photobiomodulation (PBM) | 8 | 6 | 8 | 5 | 7 | 9 | 7 | 7 | 55 | Tier 1 | [17] |
| 10 | Cognitive reserve/mental engagement | 8 | 7 | 6 | 6 | 7 | 9 | 8 | 8 | 51 | Tier 1 | [18] |
| 11 | Resveratrol/SIRT1 activation | 8 | 6 | 8 | 5 | 6 | 8 | 8 | 6 | 51 | Tier 1 | [19] |
| 12 | Creatine supplementation | 7 | 7 | 7 | 6 | 6 | 8 | 7 | 7 | 50 | Tier 1 | [20] |
| 13 | Methylene Blue/LMTX | 9 | 5 | 8 | 4 | 6 | 6 | 8 | 5 | 50 | Tier 1 | [21] |
| 14 | Coenzyme Q10 | 8 | 7 | 7 | 6 | 6 | 8 | 7 | 6 | 48 | Tier 1 | [22] |
| 15 | Ambroxol (GCase chaperone) | 8 | 5 | 8 | 5 | 6 | 8 | 7 | 6 | 48 | Tier 1 | [23] |
| 16 | Omega-3 fatty acids (DHA/EPA) | 7 | 7 | 7 | 7 | 6 | 9 | 7 | 6 | 48 | Tier 1 | [24] |
| 17 | Sleep optimization/apnea treatment | 9 | 6 | 7 | 6 | 6 | 8 | 8 | 7 | 47 | Tier 1 | [25] |
| 18 | NACET (N-acetylcysteine ethyl ester) | 7 | 6 | 7 | 5 | 6 | 8 | 7 | 6 | 46 | Tier 1 | [26] |
| 19 | Sulforaphane/Nrf2 activation | 8 | 5 | 8 | 5 | 6 | 8 | 7 | 5 | 44 | Tier 2 | [27] |
| 20 | Deferiprone (iron chelation) | 7 | 5 | 7 | 4 | 5 | 5 | 7 | 5 | 42 | Tier 2 | [28] |
| 21 | Curcumin/turmeric | 8 | 4 | 7 | 4 | 5 | 7 | 7 | 4 | 40 | Tier 2 | [29] |
| 22 | Lithium (low-dose) | 7 | 5 | 7 | 5 | 5 | 6 | 7 | 5 | 40 | Tier 2 | [30] |
| 23 | NAD+ precursors (NMN, NR) | 8 | 5 | 7 | 4 | 5 | 8 | 7 | 5 | 39 | Tier 2 | [31] |
| 24 | Alpha-lipoic acid | 7 | 5 | 6 | 5 | 5 | 7 | 6 | 5 | 38 | Tier 2 | [32] |
| 25 | Urolithin A (mitophagy) | 8 | 5 | 7 | 4 | 5 | 8 | 6 | 4 | 38 | Tier 2 | [33] |
| 26 | Melatonin | 7 | 5 | 6 | 5 | 5 | 8 | 6 | 5 | 37 | Tier 2 | [34] |
| 27 | GLP-1 receptor agonists | 7 | 5 | 7 | 4 | 5 | 7 | 6 | 4 | 37 | Tier 2 | [35] |
| 28 | Trehalose (autophagy inducer) | 7 | 3 | 6 | 3 | 4 | 6 | 6 | 4 | 35 | Tier 2 | [36] |
| 29 | Statins | 6 | 5 | 5 | 5 | 4 | 6 | 5 | 6 | 35 | Tier 2 | [37] |
| 30 | Metformin | 6 | 5 | 6 | 5 | 4 | 7 | 5 | 5 | 35 | Tier 2 | [38] |
| 31 | Aspirin/NSAIDs | 6 | 6 | 5 | 6 | 5 | 5 | 5 | 6 | 36 | Tier 2 | [39] |
| 32 | Tideglusib (GSK-3β inhibitor) | 7 | 4 | 7 | 3 | 4 | 6 | 6 | 4 | 34 | Tier 3 | [40] |
| 33 | Senolytics (D+Q, fisetin) | 7 | 3 | 6 | 3 | 4 | 5 | 6 | 4 | 34 | Tier 3 | [41] |
| 34 | Davunetide (NAP) | 6 | 3 | 6 | 2 | 4 | 7 | 5 | 4 | 32 | Tier 3 | [42] |
| 35 | Lithium + selegiline | 6 | 3 | 5 | 3 | 4 | 5 | 5 | 4 | 30 | Tier 3 | [43] |
| 36 | Fasudil (Rho-kinase inhibitor) | 6 | 3 | 5 | 2 | 4 | 6 | 5 | 3 | 29 | Tier 3 | [44] |
| 37 | Valproic acid | 5 | 3 | 5 | 3 | 3 | 4 | 4 | 4 | 27 | Tier 3 | [45] |
| 38 | Minocycline | 5 | 3 | 5 | 3 | 3 | 5 | 4 | 4 | 27 | Tier 3 | [46] |
| 39 | Botulinum toxin | 4 | 4 | 3 | 4 | 4 | 5 | 3 | 5 | 28 | Tier 3 | [47] |
| 40 | Amantadine | 4 | 4 | 3 | 4 | 4 | 5 | 3 | 5 | 28 | Tier 3 | [48] |
| 41 | Levodopa/carbidopa | 5 | 5 | 3 | 5 | 4 | 4 | 3 | 6 | 30 | Tier 3 | [49] |
| 42 | Nilotinib (BCR-ABL inhibitor) | 6 | 2 | 5 | 2 | 3 | 5 | 5 | 3 | 26 | Tier 3 | [50] |
| 43 | Exenatide (GLP-1 agonist) | 6 | 3 | 5 | 2 | 3 | 6 | 5 | 4 | 27 | Tier 3 | [51] |
| 44 | Donepezil (AChE inhibitor) | 4 | 4 | 3 | 4 | 3 | 5 | 3 | 5 | 27 | Tier 3 | [52] |
| 45 | Infliximab (TNF-α inhibitor) | 5 | 2 | 5 | 2 | 3 | 5 | 4 | 3 | 24 | Tier 3 | [53] |
| 46 | IVIG therapy | 5 | 3 | 4 | 3 | 3 | 6 | 4 | 4 | 26 | Tier 3 | [54] |
| 47 | Celecoxib | 5 | 3 | 4 | 3 | 3 | 5 | 4 | 4 | 26 | Tier 3 | [55] |
| 48 | Mefloquine | 5 | 2 | 5 | 2 | 3 | 4 | 4 | 3 | 25 | Tier 3 | [56] |
| 49 | 4-AP (dalfampridine) | 4 | 3 | 3 | 3 | 3 | 5 | 3 | 5 | 25 | Tier 3 | [57] |
| 50 | Stem cell therapy | 5 | 2 | 5 | 2 | 3 | 4 | 5 | 2 | 23 | Tier 3 | [58] |
| 51 | Focused ultrasound | 5 | 2 | 4 | 2 | 3 | 6 | 4 | 3 | 24 | Tier 3 | [59] |
| 52 | GDNF infusion | 6 | 2 | 5 | 2 | 3 | 3 | 5 | 2 | 23 | Tier 3 | [60] |
| 53 | Intranasal insulin | 5 | 2 | 4 | 2 | 3 | 5 | 4 | 3 | 23 | Tier 3 | [61] |
| 54 | Intranasal glutathione | 5 | 2 | 4 | 2 | 3 | 6 | 4 | 3 | 24 | Tier 3 | [62] |
| 55 | PBL (pyridostigmine) | 4 | 3 | 3 | 3 | 3 | 5 | 3 | 5 | 25 | Tier 3 | [63] |
| 56 | Riluzole (sodium channel modulation) | 7 | 4 | 7 | 4 | 4 | 6 | 6 | 6 | 36 | Tier 2 | [64] |
| 57 | Isradipine (calcium channel modulation) | 6 | 3 | 6 | 3 | 3 | 6 | 5 | 5 | 30 | Tier 3 | [65] |
Mechanistic Rationale: Exercise exerts neuroprotective effects through multiple pathways: increased BDNF expression, enhanced neurogenesis, reduced neuroinflammation, improved cerebral blood flow, and modulation of tau phosphorylation kinases[8:1][9:1]. The mechanisms include activation of AMPK, which in turn inhibits mTOR and promotes autophagy, potentially enhancing tau clearance. Exercise also improves lymphatic clearance of metabolic waste through physical activity-induced glymphatic activation.
CBS/PSP-Specific Evidence: Systematic reviews support exercise interventions for PSP, with improvements in gait, balance, and functional outcomes. Evidence for CBS is more limited but suggests similar benefits. The PSP Association recommends exercise as a cornerstone of management. A 2023 meta-analysis found that structured exercise programs significantly improved Timed Up and Go scores in atypical parkinsonism[9:2].
Implementation:
Mechanistic Rationale: Anti-inflammatory and antioxidant effects through omega-3 fatty acids, polyphenols, and micronutrients. Associated with reduced cognitive decline and lower AD risk. The MIND diet specifically emphasizes brain-healthy foods including leafy greens, berries, nuts, and olive oil[10:1]. The diet reduces systemic inflammation, which is implicated in tau pathology progression.
Implementation:
Components:
A 2022 systematic review found that multidisciplinary rehabilitation improved functional independence measures in 78% of PSP patients studied. The optimal approach combines PT for gait and balance, OT for activities of daily living, and SLP for speech and swallowing.
Evidence: MAO-B inhibitor with disease-modifying potential in PSP (the ADAGIO trial showed benefits in PSP patients at 1mg daily dose)[12:1]. The trial demonstrated slower decline in PSP rating scale scores compared to placebo.
Dosing: 1 mg daily (can increase to 2 mg if tolerated)
Contraindications: Concomitant meperidine, tramadol, methadone, St. John's wort, or other MAO inhibitors
Adverse effects: Nausea, insomnia, orthostatic hypotension
Mechanistic Rationale: mTOR hyperactivation suppresses autophagy in tauopathies. Rapamycin restores autophagy and enhances tau clearance through mTORC1 inhibition[13:1]. Preclinical studies in PS19 tauopathy mice showed reduced tau pathology and improved survival with rapamycin treatment.
CBS/PSP-Specific: mTOR signaling is dysregulated in PSP postmortem brain tissue, supporting the biological rationale.
Dosing: 5-6 mg weekly (intermittent dosing preferred to reduce adverse effects)
Monitoring: Lipid panel (can increase cholesterol), blood counts, opportunistic infections
Mechanistic Rationale: TUDCA (tauroursodeoxycholic acid) acts as a chemical chaperone, reduces ER stress, inhibits apoptosis, and has anti-inflammatory properties[14:1]. The drug has shown benefit in the CENTAUR trial for ALS and is being investigated in PSP.
Dosing: 500-1000 mg daily divided doses
Source: Available as over-the-counter supplement; pharmaceutical-grade available in some countries
Evidence: Vitamin D receptors are present throughout the brain, and low levels are associated with cognitive decline[15:1]. Vitamin D has immunomodulatory effects and may reduce neuroinflammation. CBS/PSP patients often have low vitamin D due to reduced sun exposure and mobility limitations.
Dosing: 2000-4000 IU daily (adjust based on serum levels)
Target: Serum 25(OH)D > 40 ng/mL
Mechanistic Rationale: Spermidine induces autophagy through EP300 inhibition and eIF5A hypusination, promoting cellular clearance mechanisms[16:1]. The SmartAge trial tested spermidine supplementation in older adults with cognitive decline.
Sources: Wheat germ extract, fermented foods, supplements
Dosing: 1-3 mg daily of standardized extract
Mechanistic Rationale: Near-infrared light penetrates brain tissue and stimulates cytochrome c oxidase, enhancing mitochondrial function and ATP production[17:1]. PBM also reduces oxidative stress and may enhance cerebral blood flow.
Evidence: Small RCTs in PD have shown improvements in gait and motor scores. CBS/PSP evidence is preliminary but mechanistically promising.
Devices: Helmets, intranasal devices, or transcranial setups; cost varies significantly
Mechanistic Rationale: Higher cognitive reserve, built through education, mental engagement, and complex occupations, is associated with slower disease progression and greater resilience to neurodegeneration[18:1]. Cognitive reserve may allow patients to maintain function despite equivalent pathological burden.
Implementation: Lifelong learning, social engagement, cognitively stimulating activities
Many interventions have synergistic potential, addressing multiple pathological pathways simultaneously. The following combinations are supported by mechanistic rationale and preliminary evidence:
| Combination | Rationale | Evidence Level | Notes |
|---|---|---|---|
| Exercise + Sleep optimization | Complementary mechanisms | Strong | Foundational combination |
| Mediterranean diet + Omega-3 | Anti-inflammatory synergy | Moderate | EPA+DHA enhances diet benefits |
| Rapamycin + Autophagy inducers | Enhanced clearance | Preclinical | Trehalose, spermidine |
| Exercise + Vitamin D | Muscle + bone health | Strong | Prevents falls |
| CoQ10 + Creatine | Mitochondrial energy | Moderate | Complementary mechanisms |
| Exercise + Cognitive reserve | Neuroplasticity enhancement | Strong | Synergistic benefits |
Baseline:
Follow-up:
Several promising interventions are in various stages of investigation:
The proteomics landscape in CBS and PSP has advanced significantly, revealing distinct molecular signatures that inform therapeutic strategies targeting protein homeostasis. This section synthesizes proteomic findings with protein stability networks to guide proteostasis-targeted interventions.
Regional brain proteomics in PSP has identified distinct protein alterations across affected brain regions[66]:
| Brain Region | Key Protein Changes | Therapeutic Relevance |
|---|---|---|
| Globus pallidus | Upregulated mitochondrial proteins | Energy metabolism targets |
| Subthalamic nucleus | Downregulated synaptic proteins | Neuroprotective strategies |
| Superior colliculus | Elevated 4R tau isoforms | Oculomotor interventions |
| Pedunculopontine nucleus | Reduced cholinergic markers | Gait/fall prevention |
CSF biomarker panels have identified PSP-specific signatures[67][68]:
The proteostasis network comprises three integrated systems[69]:
Proteasomal impairment contributes to tau accumulation[70]:
| Component | Alteration | Therapeutic Target |
|---|---|---|
| 20S Core (β5) | Reduced chymotrypsin-like activity | Proteasome enhancement |
| 19S Regulatory Cap | Sequestration in aggregates | Restore function |
| E3 Ligases (CHIP, Parkin) | Dysregulated | Enhance expression |
Macroautophagy dysfunction in CBS/PSP involves[71]:
HSP70 and HSP90 are critical chaperones for tau homeostasis[72][73]:
| Strategy | Agent | Mechanism | Stage |
|---|---|---|---|
| HSP70 induction | Geranylgeranylacetone | Transcriptional upregulation | Preclinical |
| HSP90 inhibition | PU-H71, NVP-HSP990 | Upregulates HSP70 | Research |
| Chemical chaperones | TUDCA, 4-PBA | Protein folding stabilizers | Tier 1 (TUDCA) |
Small molecule chaperones have shown promise[@cortez2019]:
Proteasome enhancement is the goal in CBS/PSP (not inhibition, which worsens neurodegeneration)[70:1]:
| Agent | Mechanism | Evidence Level |
|---|---|---|
| Quercetin | Multi-target proteasome enhancement | Preclinical |
| Rolipram | cAMP elevation, proteasome activation | Experimental |
| PA28γ | Increase β5 proteasome activity | Research |
Critical Note: Patients should avoid proteasome inhibitors (bortezomib, carfilzomib, ixazomib) used in oncology.
TFEB (Transcription Factor EB) coordinates lysosomal biogenesis and autophagy[74]:
| Agent | TFEB Activation | Evidence |
|---|---|---|
| Rapamycin | Indirect (via mTOR) | Strong preclinical |
| Trehalose | Indirect | Moderate preclinical |
| GCase modulators | Indirect | Emerging |
The following interventions target protein stability pathways (see Treatment Rankings table):
| Intervention | Evidence Score | Proteostasis Mechanism | Tier |
|---|---|---|---|
| Rapamycin | 57/80 | mTOR inhibition, autophagy induction | Tier 1 |
| Spermidine | 55/80 | Autophagy induction, EP300 inhibition | Tier 1 |
| TUDCA/UDCA | 56/80 | Chemical chaperone, ER stress reduction | Tier 1 |
| Ambroxol | 48/80 | GCase chaperone + autophagy | Tier 1 |
| Trehalose | 35/80 | Autophagy induction (TFEB) | Tier 2 |
Based on proteomic findings, emerging targets include[75]:
Patient Counseling Points:
Monitoring Parameters:
Exercise represents one of the most powerful disease-modifying interventions available for neurodegenerative conditions, with robust evidence supporting its role in promoting neuroplasticity, reducing neuroinflammation, and enhancing cognitive function. In CBS and PSP, where tau pathology disrupts cortical-subcortical circuits, targeted exercise protocols can help preserve remaining neural connections and potentially slow disease progression through neurotrophic mechanisms.
BDNF is the primary mediator of exercise-induced neuroplasticity[76][77]. Physical activity triggers BDNF expression through multiple pathways:
In CBS/PSP patients, BDNF levels are typically reduced due to tau pathology affecting cortical and hippocampal regions. Exercise interventions can partially restore BDNF signaling, with studies showing 15-30% increases in serum BDNF following 12-week aerobic programs.
Exercise also promotes additional neurotrophic molecules:
| Factor | Primary Effect | Exercise Response |
|---|---|---|
| IGF-1 | Synaptic plasticity, neurogenesis | 20-40% increase with resistance training |
| VEGF | Angiogenesis, neuroprotection | 25-50% increase with aerobic exercise |
| NGF | Neuronal survival, differentiation | Moderate increase with combined training |
Tau pathology in CBS/PSP directly impairs synaptic function through:
Exercise counteracts these mechanisms by:
Exercise induces measurable structural changes in CBS/PSP:
The cortico-basal ganglia-thalamocortical circuits affected in CBS/PSP can be partially restored through:
Evidence supports a dose-response relationship for neuroprotective effects:
| Intensity Level | Target Heart Rate | Neuroplasticity Evidence |
|---|---|---|
| Light (50-60% HRmax) | 100-115 bpm | Modest BDNF increase, limited cognitive benefit |
| Moderate (60-70% HRmax) | 115-130 bpm | Optimal BDNF response, demonstrated cognitive benefits |
| Vigorous (70-85% HRmax) | 130-150 bpm | Maximal BDNF, but higher fall risk in CBS/PSP |
| High (85%+ HRmax) | >150 bpm | Not recommended due to cardiovascular risk |
For CBS/PSP patients, moderate intensity (60-70% HRmax) provides the optimal balance between neuroplasticity benefits and safety.
Research suggests:
CBS/PSP-specific precautions:
Purpose: Preserve cardiovascular fitness and baseline BDNF levels
Purpose: Improve automaticity of movement to reduce cognitive burden
Purpose: Promote circuit-specific plasticity in affected motor pathways
Purpose: Maximize BDNF and neuroplasticity through simultaneous cognitive challenge
Track these indicators to adjust exercise prescriptions:
| Indicator | Adjustment |
|---|---|
| BDNF <10% increase | Increase intensity to 70% or add cognitive component |
| 6MWT decline >15% | Reduce intensity, increase rest intervals |
| TUG increase >20% | Add balance training, reduce gait speed |
| Fatigue >48 hours post-exercise | Reduce session duration by 25% |
Exercise synergizes with several CBS/PSP interventions:
Exercise physiology and neuroplasticity interventions in CBS/PSP are supported by:
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