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PACAP deficiency as a model of aging

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Abstract

Dysregulation of neuropeptides may play an important role in aging-induced impairments. In the long list of neuropeptides, pituitary adenylate cyclase–activating polypeptide (PACAP) represents a highly effective cytoprotective peptide that provides an endogenous control against a variety of tissue-damaging stimuli. PACAP has neuro- and general cytoprotective effects due to anti-apoptotic, anti-inflammatory, and antioxidant actions. As PACAP is also a part of the endogenous protective machinery, it can be hypothesized that the decreased protective effects in lack of endogenous PACAP would accelerate age-related degeneration and PACAP knockout mice would display age-related degenerative signs earlier. Recent results support this hypothesis showing that PACAP deficiency mimics aspects of age-related pathophysiological changes including increased neuronal vulnerability and systemic degeneration accompanied by increased apoptosis, oxidative stress, and inflammation. Decrease in PACAP expression has been shown in different species from invertebrates to humans. PACAP-deficient mice display numerous pathological alterations mimicking early aging, such as retinal changes, corneal keratinization and blurring, and systemic amyloidosis. In the present review, we summarize these findings and propose that PACAP deficiency could be a good model of premature aging.

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Funding

This study received financial support from NAP2017-1.2.1-NKP-2017-00002; GINOP-2.3.2-15-2016-00050 “PEPSYS”, MTA-TKI14016; NKFIH K119759, FK129190, Bolyai Scholarship, PTE-AOK KA-2017-15, EFOP-3.6.3-VEKOP-16-2017-00009, EFOP-3.6.1.-16-2016-00004 Comprehensive Development for Implementing Smart Specialization Strategies at the University of Pécs; New Excellence Program, UNKP-16-4 and 18-2, TAMOP 4.2.4.A/2-11-1-2012-0001, EFOP-3.6.3-VEKOP-16-15 2017-00008, “The role of neuro-inflammation in neurodegeneration: from molecules to clinics.” Higher Education Institutional Excellence Programme of the Ministry of Human Capacities in Hungary, within the framework of the 20765-3/2018/FEKUTSTRAT.

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Correspondence to D. Reglodi.

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Reglodi, D., Atlasz, T., Szabo, E. et al. PACAP deficiency as a model of aging. GeroScience 40, 437–452 (2018). https://doi.org/10.1007/s11357-018-0045-8

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  • DOI: https://doi.org/10.1007/s11357-018-0045-8

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