Sex-Related Differences in Rat Choroid Plexus and Cerebrospinal Fluid: A cDNA Microarray and Proteomic Analysis

Area of Science:

• Neuroscience
• Endocrinology
• Proteomics

Background:

• The choroid plexus (CP) epithelium interfaces blood and cerebrospinal fluid (CSF), with its transcriptome influenced by sex hormones.
• Understanding sex-related differences in CP function is crucial for brain physiology and disease research.

Purpose of the Study:

• To compare gene and protein expression profiles in the CP and CSF between male and female rats.
• To elucidate sex-specific differences in CP functions and their implications for brain health.

Main Methods:

• Utilized cDNA microarrays to analyze CP transcriptomes in male and female rats.
• Performed proteomic analysis on CSF from gonadectomized and sham-operated male and female rats.

Main Results:

• Identified significant sex-related differences in CP gene expression pathways, including circadian rhythm, stem cell differentiation, metabolism, and barrier function.
• Proteomic analysis revealed distinct protein profiles in CSF, with five proteins down-regulated in males versus females and seven proteins varying in gonadectomized males.
• No significant differences were observed in major pathways like mitochondrial dysfunction or oxidative phosphorylation between sexes, but specific functions showed differential regulation.

Conclusions:

• Demonstrated clear sex-related differences in choroid plexus gene expression and cerebrospinal fluid protein composition in rats.
• These findings suggest that sex hormones significantly influence CP function and CSF milieu, potentially impacting the susceptibility and progression of neurological diseases.