The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript

The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. == References ==. contents. These data clearly indicated that rmMFG-E8 upregulated SOCS3 which in turn interacted with NF-B p65, facilitating negative regulation of TLR4 signaling for LPS-induced TNF- production. Our findings 6-Benzylaminopurine strongly suggest that MFG-E8 is a direct anti-inflammatory molecule, and that it could be developed as a therapy in attenuating inflammation and tissue injury. == Introduction == The glycoprotein, MFG-E8 is mainly secreted by mononuclear cells, and participates in the phagocytosis of apoptotic cells by tethering between phosphatidylserine (PS) on apoptotic cells and v3-integrin on phagocytes[1]. Detrimental autoimmune diseases are likely to be seen in MFG-E8/mice due to the infiltration of apoptotic cells at the germinal centers of spleen[2],[3]. With the concept of removing the dead cells from various organs, MFG-E8 has proved to be an essential factor in controlling the progression of various inflammatory diseases[4],[5]. However, recent studies showed that MFG-E8-mediated potential therapeutic benefits in sepsis and intestinal injury were not only solely dependent on the enhanced clearance of apoptotic cells, but also rely on diverse cellular events to maintain the epithelial integrity and healing of the injured mucosa via protein kinase C (PKC) pathways[6]. Furthermore, MFG-E8-mediated upregulation of Akt, twist and MAP kinase signaling to perform several intra-cellular functions has also been reported[7],[8]. In mammals, Toll like receptor (TLR) 4 expressed in immune-reactive cells can efficiently recognize bacterial lipopolysaccharide (LPS) and trigger down-stream signaling via several adaptor molecules, e.g., myeloid differentiation factor 88 (MyD88), Toll/IL-1 receptor domain-containing adaptor (TIRAP)/MyD88-adaptor-like (Mal), IL-1 receptor-associated kinase (IRAK), and TNF receptor-associated factor 6 (TRAF6) to induce NF-B, MAP kinases and JNK pathways. This in turn upregulates the expression of pro-inflammatory cytokines, e.g., tumor necrosis factor (TNF)-[9],[10]. Uncontrolled activation of innate immune system by LPS may cause 6-Benzylaminopurine endotoxin shock[11], attributing a tightly controlled mechanism for its regulation. To maintain the fine-tuned balance of TLR4 pathway, several intracellular negative regulators, e.g., A20, IRAK-M, and Tollip are also become activated under LPS-treated conditions[12],[13]. Signal transducer and activator of 6-Benzylaminopurine transcription (STAT) 3 is known to play essential roles in maintaining the homeostatic balance between pro- and anti-inflammatory signals in immune competent cells induced by a wide ranges of cytokines, interleukin (IL)-5, 6, 10, interferon (IFN)-, epidermal growth factor (EGF), hepatocyte growth factor (HGF), hormones (prolactin, leptins) and other factors, leukemia inhibitory factor (LIF), bone morphogenetic protein (BMP)-2[14][16]. Although there are seven members of STAT proteins available in cellular systems, the role of STAT3 is widely described in the field of innate-immune system induced by those cytokines and growth factors. The activation of STAT3 by various ligands occurs by binding to their respective receptors and receptor-associated kinases. The binding of IL-6 family of cytokines to the gp130 receptor triggers STAT3 phosphorylation by janus kinase (JAK) 2[17]. Epidermal growth factor receptor and certain other receptor tyrosine kinases, such as c-MET, phosphorylate STAT3 in response to their ligands[18]. STAT3 is also a target of the c-Src non-receptor tyrosine kinase induced by various ligands[19]. Since STAT3-deficient mice are lethal[20], studies in conditional knock-out mice containing STAT3-deficient monocytes and neutrophils showed a reduced survival from endotoxic shock[21],[22]. An intriguing feature of STAT3 signaling lies with the fact that its function is firmly controlled by the STAT-induced STAT inhibitor (SSI) family of proteins, that are also known as suppressor of cytokine signaling (SOCS). In mammals, eight members of the SOCS proteins (SOCS1-7 and CIS) have been reported[23]. SOCS1 and 3 possess a kinase-inhibitory region (KIR) domain that is critical for inhibition of kinase activity[24]. In addition, over-expression studies have shown that both SOCS1 and 3 exhibit negative regulatory effects on TLR4 signaling[25]. Recent reports demonstrated that LPS-induced pro-inflammatory cytokine production and NF-B activation are inhibited in cells over-expressing SOCS proteins[25],[26]. Several adaptor molecules that bridge between TLR4 and NF-B, e.g., MAL/TIRAP, IRAK1 are the target of SOCS for ubiquitination and proteasomal degradation, resulting in abrogation of NF-B activation[26][28]. Moreover, SOCS1 proteins are also known to regulate TLR-induced NF-B activation by direct interaction with p65 subunit of NF-B, causing downregulation of p65 protein levels by ubiquitin-mediated degradation[29]. Although MFG-E8 is a potential therapeutic agent in terms of downregulating the expression of FRPHE pro-inflammatory cytokines in various inflammatory.