Hypothermia slows sequential and parallel steps initiated during caerulein pancreatitis

Area of Science:

• Gastroenterology and Hepatology
• Cellular Biology
• Biochemistry

Background:

• Acute pancreatitis (AP) involves multiple simultaneous signaling cascades, complicating single-target drug therapies.
• Understanding how to inhibit these parallel pathways is crucial for effective AP treatment.

Purpose of the Study:

• To investigate if cooling acinar cells can simultaneously slow distinct signaling steps in AP.
• To determine the temperature range for effective inhibition of pancreatitis-induced signaling.

Main Methods:

• Acinar cells were stimulated with caerulein at various temperatures (37°C down to 25°C).
• Key markers including trypsinogen activation (TGA), inflammatory cytokine mRNA (CXCL1, CXCL2), and cell injury were measured.
• Enzyme activities (trypsin, cathepsin B) and cathepsin B-mediated TGA were assessed at different temperatures (37°C, 23°C, 4°C).

Main Results:

• Cooling to 29°C reduced TGA and inflammatory gene expression by over 80%.
• Cell injury was significantly reduced at 34°C compared to 37°C.
• Enzyme activities and TGA were notably lower at 23°C, and cooling at 31°C reduced injury even when delayed.

Conclusions:

• Hypothermia synergistically inhibits parallel signaling pathways activated in AP.
• Simultaneous slowing of distinct signaling steps reduces trypsinogen activation, inflammation, and acinar cell damage.
• Acinar cell cooling presents a promising therapeutic strategy for acute pancreatitis.