Expression of pancreatitis-associated protein after traumatic brain injury : a mechanism potentially contributing to neuroprotection in human brain

März-Weiss, Pia and Kunz, Dieter and Bimmler, Daniel and Berkemeier, Caroline and Özbek, Suat and Dimitriades-Schmutz, Beatrice and Haybaeck, Johannes and Otten, Uwe and Graf, Rolf. (2011) Expression of pancreatitis-associated protein after traumatic brain injury : a mechanism potentially contributing to neuroprotection in human brain. Cellular and molecular neurobiology, Vol. 31, No. 8. pp. 1141-1149.

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Official URL: http://edoc.unibas.ch/dok/A6006569

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Neuronal cell death after severe traumatic brain injury (TBI) is caused by a complex interplay of pathological mechanisms including excitotoxicity, oxidative stress, mitochondrial dysfunction, extensive neuroinflammation, and ischemia-reperfusion injury. Pancreatitis-associated protein I (PAP I/reg2) was reported to be a survival factor for peripheral neurons, particularly sensory and motor neurons. In rat brains, by experimental TBI as well as by kainic acid induced brain seizure, PAP I and PAP III were found to be up-regulated in central neurons. In this study, we performed immunohistochemical staining in postmortem human brain from patients who died after severe TBI to demonstrate PAP expression on protein level in cerebellar Purkinje cells, pyramidal and granular neurons in cerebral cortex, and cortical neurons in the fore- and mid-brain. In primary cultures of rat brain cortical, hippocampal, and cerebellar neurons, we found neuroprotective effects for PAP I on H(2)O(2)-induced oxidative stress. Moreover, serum K(+)-deprivation induces apoptotic cell death in 55% of cerebellar granule neurons (CGN), whereas upon treatment with PAP I only 32% of CGN are apoptotic. Using Western blot analyses, we compared protein phosphorylation in neuronal signaling pathways activated by PAP I versus Interleukin-6 (IL-6). We found a rapid activation of Akt-kinase phosphorylation by PAP I with a peak at 15 min, whereas IL-6 induces Akt-phosphorylation lasting longer than 30 min. Phosphorylation of MAP-42/44 kinases is stimulated in a comparable fashion. Both, IL-6 and PAP I increase phosphorylation of NF?B for activation of gene transcription, whereas only IL-6 recruits STAT3 phosphorylation, indicating that STAT3 is not a target of PAP I transcription activation in brain neurons. Application of the Akt-inhibitor Wortmanin reveals only a partial inhibition of PAP I-dependent protection of CGN from H(2)O(2)-induced oxidative stress. Based on our findings, we suggest that PA is a long lasting neurotrophic signal for central neurons. The neuroprotective effects parallel those that have been described for effects of PAP I in ciliary neurotrophic factor (CNTF)-mediated survival of sensory and motor neurons. PAP I may act in autocrine and/or paracrine fashion and thus may contribute to endogenous protective mechanisms relevant under harmful conditions like oxidative stress, brain injury, or neurodegeneration.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Former Units at DBM > Molecular Neurobiology Neural-immune interactions (Otten)
UniBasel Contributors:Kunz, Dieter
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Plenum Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Dec 2013 09:36
Deposited On:06 Dec 2013 09:36

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