Neuroprotective potential of high-dose biotin

Area of Science:

• Neuroscience
• Pharmacology
• Biochemistry

Background:

• High-dose biotin (100 mg TID) has shown a stabilizing effect on multiple sclerosis (MS) progression in clinical trials.
• The mechanism is often attributed to biotin's cofactor role, but direct stimulation of soluble guanylate cyclase (sGC) by pharmacological biotin concentrations is proposed.
• This stimulation leads to increased cyclic guanosine monophosphate (cGMP) levels in the brain.

Purpose of the Study:

• To explore the potential neuroprotective mechanisms of high-dose biotin beyond its cofactor role in MS.
• To investigate the role of biotin-induced cGMP production in neuronal survival, plasticity, and disease modulation.
• To assess the potential of high-dose biotin in managing neurodegenerative diseases like Alzheimer's disease (AD) and stroke.

Main Methods:

• Review of existing literature on biotin's effects, cGMP signaling pathways, and neuroprotection.
• Analysis of how cGMP influences neuronal survival, plasticity, and disease-specific mechanisms (e.g., amyloid beta in AD).
• Consideration of potential synergistic effects with phosphodiesterase-5 inhibitors.

Main Results:

• Pharmacological biotin concentrations may directly stimulate sGC, increasing brain cGMP levels.
• cGMP exerts neurotrophic-mimetic effects, promoting neuron survival and plasticity via PI3K-Akt and Ras-ERK pathways.
• In AD models, cGMP counteracts amyloid beta's inhibition of long-term potentiation and suppresses amyloid precursor protein and BACE1 expression.
• cGMP also promotes neurogenesis and may reduce stroke risk by affecting cerebral vasculature.

Conclusions:

• High-dose biotin's therapeutic effects in MS may involve direct sGC stimulation and subsequent cGMP elevation.
• Biotin-induced cGMP offers broad neuroprotective potential, including in Alzheimer's disease and stroke prevention.
• Concurrent use of brain-permeable phosphodiesterase-5 inhibitors could enhance biotin's neuroprotective effects.