HSF1-deficiency affects gait coordination and cerebellar calbindin levels

Area of Science:

• Neuroscience
• Cellular Biology
• Genetics

Background:

• Heat shock proteins (HSPs) are crucial for cell homeostasis and protection against damage.
• HSPs and their primary activator, heat shock factor 1 (HSF1), are implicated in ataxia.
• HSF1-deficient mice exhibit motor control deficits, but gait coordination effects remain unclear.

Purpose of the Study:

• To investigate the impact of HSF1 deficiency on locomotor and gait coordination.
• To explore the relationship between HSF1 and calbindin in Purkinje cells of the cerebellum.
• To elucidate HSF1's role in cerebellar function and homeostasis.

Main Methods:

• Utilized an automated gait analysis system to assess locomotor and gait parameters in HSF1-deficient (HSF1-/-) and wildtype (HSF1+/+) mice.
• Performed immunohistochemical analyses to examine HSF1 and calbindin co-localization in Purkinje cells.
• Quantified calbindin mRNA and protein levels using quantitative PCR, immunoblotting, and immunohistochemistry.

Main Results:

• HSF1-/- mice displayed significant gait abnormalities, suggesting cerebellar ataxia.
• HSF1 was co-localized with calbindin in cerebellar Purkinje cells.
• Calbindin protein levels were significantly reduced in HSF1-/- mice, while mRNA levels remained unchanged.
• Pathway analysis supported an interconnection between HSF1 and calbindin.

Conclusions:

• Targeted deletion of HSF1 leads to altered locomotor function and reduced cerebellar calbindin protein levels.
• These findings indicate a role for HSF1 in regulating Purkinje cell calcium homeostasis.
• HSF1 is suggested to be a key factor in maintaining cerebellar function and preventing ataxia.