@article {44014,
	title = {Host{\textquoteright}s Endogenous Caveolin-1 Expression is Downregulated in the Lung During Sepsis to Promote Cytoprotection.},
	journal = {Shock},
	volume = {50},
	year = {2018},
	month = {2018 Aug},
	pages = {199-208},
	abstract = {The present study focuses on the profile of "endogeneous" caveolin-1 protein in septic lung (CLP model).Caveolin-1, CD25, pP38, pAkt, and 14-3-3b protein expression profiles were studied using flow cytometry and immunohistochemistry 6, 12, 24, 36, and 48 h after sepsis induction. Cell viability was determined by 7-AAD staining and fibrosis by Masson trichrome stain. The effect of protein C zymogen concentrate (PC) on caveolin-1 expression was also investigated given that PC, once dissociated from caveolin-1, elicits a PAR-1-mediated protective signaling by forming a complex with endothelial protein C receptor (EPCR).CLP treatment increased lung inflammation and cell apoptosis. Fibrosis was apparent in vessels and alveoli. Caveolin-1+ cells presented reduced protein expression, especially 12 h post-CLP (P = 0.002). Immunohistochemistry revealed caveolin-1 positive expression mainly in regions with strong inflammatory reaction. Early induction of pP38+ cell population (P = 0.014) and gradual increase of CD25+ cells were also observed. Alternations in 14-3-3b expression related to apoptosis were apparent and accompanied by increased AKT phosphorylation activity late during sepsis progression.After PC administration, cell apoptosis was reduced (P = 0.004) and both the percentile and expression intensity of caveolin-1 positive cells were compromised (P = 0.009 and P = 0.027, respectively). 14-3-3b, CD25, and pP38 protein expression were decreased (P = 0.014, P = 0.004, and P = 0.007, respectively), whereas pAkt expression was induced (P = 0.032).The observed decline of endogenous caveolin-1 protein expression during sepsis implies its involvement in host{\textquoteright}s cytoprotective reaction either directly, by controlling caveolae population to decrease bacterial burden, or indirectly via regulating 14-3-3b-dependent apoptosis and EPCR-PAR-1-dependent protective signaling.},
	keywords = {Animals, apoptosis, Caveolin 1, Cytoprotection, Disease Models, Animal, Down-Regulation, Lung, Protein C, Rats, Rats, Wistar, Sepsis, signal transduction},
	issn = {1540-0514},
	doi = {10.1097/SHK.0000000000001005},
	author = {Kataki, Agapi and Karagiannidis, Ioannis and Memos, Nikolaos and Koniaris, Efthymios and Antonakis, Pantelis and Papalois, Apostolos and Zografos, George C and Konstadoulakis, Manoussos M}
}
