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Alveolar macrophages (AMs) are the first line of defense against foreign stimulation in alveoli, and they participate in inflammatory responses during acute lung injury (ALI). Previous studies indicated that paralemmin-3 (PALM3) expression is induced by lipopolysaccharides (LPS) and may be involved in LPS-Toll-like receptor 4 (TLR4) signaling in alveolar epithelial cells. The aim of the present study was to investigate the effect of PALM3 on LPS-induced inflammation and its underlying mechanisms in rat AMs. For this purpose, the authors detected the expression of PALM3 in AMs by reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and western blotting following LPS stimulation. Following this, a recombinant adenovirus expressing short hairpin RNA (shRNA) for PALM3 was constructed, as well as a recombinant adenovirus carrying the rat PALM3 gene to modulate the expression of PALM3 in rat AMs. At 48 h after transfection, the PALM3 expression in AMs was detected by RT-qPCR and western blotting. The levels of several cytokines and the activity of nuclear factor-κB and interferon regulatory factor 3 in AMs were measured after LPS stimulation. The localization of PALM3 and LPS-TLR4 signaling adaptor molecules in AMs was analyzed by confocal microscopy, and the physical interactions of PALM3 with these adaptors were assessed by co-immunoprecipitation assays. LPS induced PALM3 expression in AMs and that PALM3 expression promoted the LPS-induced inflammatory response, while PALM3 downregulation suppressed the LPS-induced inflammatory response in AMs. In addition, the results demonstrated that PALM3 could interact with TLR4, myeloid differentiation factor 88, interleukin (IL)-1 receptor associated kinase-1, tumor necrosis factor receptor associated factor-6, and Toll-IL-1 receptor containing adapter molecule-2 in AMs after LPS stimulation. These results suggested that PALM3 contributes to the LPS-induced inflammatory response and participates in LPS-TLR4 signaling in AMs. These data may provide the basis for the development of novel targeted therapeutic strategies of treating ALI.

international journal of molecular medicine

Paralemmin-3 contributes to lipopolysaccharide-induced inflammatory response and is involved in lipopolysaccharide-Toll-like receptor-4 signaling in alveolar macrophages