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PACAP is an endogenous protective factor-insights from PACAP-deficient mice.

D Reglodi1, P Kiss, K Szabadfi

  • 1Department of Anatomy, PTE-MTA Lendulet PACAP Research Group, University of Pecs, 7624 Pecs, Szigeti u 12, Hungary. dora.reglodi@aok.pte.hu

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Pituitary adenylate cyclase-activating polypeptide (PACAP) is crucial for protecting cells and tissues. Mice lacking PACAP show increased vulnerability to various injuries, highlighting its vital cytoprotective role.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Immunology

Background:

  • Pituitary adenylate cyclase-activating polypeptide (PACAP) is a neuropeptide with diverse biological roles.
  • PACAP exhibits significant neuroprotective and cytoprotective effects, safeguarding tissues from various insults.
  • Endogenous PACAP is essential for maintaining tissue integrity and resilience against damage.

Purpose of the Study:

  • To review and summarize the heightened sensitivity of PACAP-deficient mice to various injuries.
  • To consolidate evidence supporting the endogenous cytoprotective functions of PACAP.
  • To explore the role of PACAP in different models of neurological and peripheral organ damage.

Main Methods:

  • Review of studies utilizing PACAP-deficient mouse models.
  • Analysis of in vitro and in vivo experimental data across multiple injury models.
  • Comparative assessment of injury severity and outcomes in PACAP-deficient versus wild-type mice.

Main Results:

  • PACAP-deficient mice exhibit exacerbated injury in cerebral ischemia, autoimmune encephalomyelitis, and axonal lesions.
  • Increased neuronal cell loss is observed in retinal ischemic and excitotoxic injuries in PACAP-deficient mice.
  • Peripheral organs show heightened sensitivity, including kidney cells to oxidative stress/hypoxia, and worsened outcomes in ischemia/reperfusion injury, inflammation, and toxic lesions.

Conclusions:

  • The absence of endogenous PACAP significantly increases vulnerability to a wide range of injuries in both the nervous system and peripheral organs.
  • These findings strongly support the hypothesis that PACAP is an integral component of the body's endogenous cytoprotective defense mechanisms.
  • PACAP deficiency compromises cellular resilience, leading to more severe pathological consequences across diverse physiological systems.