Peripheral inflammation is accompanied by cerebral hypoperfusion in mice.

Area of Science:

• Neuroscience
• Vascular Biology
• Pain Research

Background:

• Chronic pain is linked to brain changes and neuropsychiatric issues.
• The mechanisms connecting peripheral inflammation to brain alterations are not fully understood.
• Understanding these links is crucial for treating pain-related brain dysfunction.

Purpose of the Study:

• To quantify changes in cerebral blood perfusion using laser speckle contrast imaging (LSCI).
• To investigate the effects of Complete Freund's adjuvant (CFA)-induced peripheral inflammation on brain blood flow.
• To establish a link between peripheral inflammation and cerebral hypoperfusion.

Main Methods:

• Adult male and female C57BL/6 mice were used.
• Groups received varying doses of CFA or saline in the hindpaw.
• Cerebral blood perfusion was measured using in vivo LSCI of parietal-temporal lobes three days post-injection.

Main Results:

• Complete Freund's adjuvant (CFA) induced local inflammation in the hindpaw.
• A dose-dependent reduction in cerebral blood perfusion was observed.
• Cerebral hypoperfusion occurred alongside signs of local inflammation.

Conclusions:

• This study demonstrates, for the first time, the use of LSCI to assess CFA-induced peripheral inflammation effects on cerebral blood perfusion.
• Peripheral inflammation can lead to reduced brain blood flow.
• This research is a foundational step in understanding vascular mechanisms linking peripheral tissue injury to brain plasticity.