Exogenous Hsp70 delays senescence and improves cognitive function in aging mice

Area of Science:

• Neuroscience
• Gerontology
• Molecular Biology

Background:

• Heat Shock Protein 70 (Hsp70) is crucial for neuronal protection in neurodegenerative diseases.
• Hsp70 levels and activity decline with age, impacting neuronal health.
• Aging is associated with reduced chaperone availability and increased susceptibility to neurological disorders.

Purpose of the Study:

• To investigate the effects of intranasal administration of exogenous recombinant human Hsp70 (eHsp70) on lifespan and neurological parameters in aging mice.
• To evaluate eHsp70 as a potential therapeutic agent for age-related neurological decline.
• To explore the impact of eHsp70 on synaptic integrity and aging markers.

Main Methods:

• Long-term intranasal administration of eHsp70 in middle-aged and old mice.
• Lifespan assessment across different age groups.
• Behavioral tests (learning, memory, locomotor, exploratory activities).
• Immunohistochemical analysis of synaptophysin and neuron density.
• Measurement of lipofuscin accumulation and proteasome activity.

Main Results:

• eHsp70 significantly enhanced the lifespan of aging mice.
• Chronic eHsp70 treatment improved learning, memory, and locomotor activity in old mice.
• eHsp70 increased synaptophysin-positive areas and neuron density in old mice.
• Treatment reduced lipofuscin accumulation and enhanced proteasome activity in the brain.

Conclusions:

• Intranasal eHsp70 administration offers a promising therapeutic approach for combating age-related neurodegenerative disorders.
• eHsp70 protects synaptic machinery and improves neurological function in aging animals.
• This strategy may help mitigate the effects of aging on the brain and enhance overall healthspan.