Native and Complexed IGF-1: Biodistribution and Pharmacokinetics in Infantile Neuronal Ceroid Lipofuscinosis

Area of Science:

• Neuroscience
• Biomaterials Science
• Pharmacology

Background:

• Infantile neuronal ceroid lipofuscinosis (INCL) is a severe childhood neurodegenerative disorder.
• Insulin-like growth factor 1 (IGF-1) is a potential therapeutic for central nervous system disorders.
• IGF-1 bioavailability is limited by its binding to IGFBP-3 and potential side effects of free IGF-1.

Purpose of the Study:

• To evaluate mesoporous silicon nanoparticles (NPs) as carriers for sustained IGF-1 delivery.
• To compare the biodistribution, pharmacokinetics, and bioavailability of different IGF-1 formulations.
• To assess the therapeutic potential of IGF-1/NP complexes in an INCL mouse model.

Main Methods:

• Development of radiolabeled free IGF-1, IGF-1/IGFBP-3, and IGF-1/NP complexes.
• Administration of complexes to Cln1-/- knockout mice (INCL model).
• Quantification of biodistribution and pharmacokinetics over time.

Main Results:

• IGF-1/NP complexes showed preferential accumulation in the liver and spleen.
• Minor, consistent amounts of IGF-1/NP were found in other organs compared to free IGF-1 or IGF-1/IGFBP-3.
• IGF-1/NP maintained relatively high and stable blood concentrations, indicating sustained release.

Conclusions:

• Mesoporous silicon nanoparticles effectively modulate IGF-1 bioavailability.
• IGF-1/NP complexes demonstrate potential for sustained therapeutic delivery in neurodegenerative conditions.
• Further research into IGF-1/NP for INCL treatment is warranted.