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The essential role of mitochondria in regulation of metabolic function and other physiological processes has garnered enormous interest in understanding the mechanisms controlling the function of this organelle. We assessed the role of the BBSome, a protein complex composed of eight Bardet-Biedl syndrome (BBS) proteins, in the control of mitochondria dynamic and function.
Chemotherapy-induced intestinal mucositis (CIM) is a major dose-limiting side effect, resulting from the nonspecific cytoablative actions of chemoagents, including 5-fluorouracil (5-FU) and irinotecan (CPT-11). Preventive strategies are urgently needed for the predictable CIM. Previously, we have demonstrated an important role of recombinant human interleukin-1 receptor antagonist (rhIL-1Ra) in the prevention of cyclophosphamide-induced mucositis in mice. In this study, the preventive role of rhIL-1Ra was further evaluated in 5-FU- and CPT-11-induced mucositis mouse models. rhIL-1Ra pretreatment reduced the incidence, severity, and duration of chemotherapy-induced diarrhea, through attenuating crypt apoptosis and improving crypt survival in wild-type mice, but not in IL-1RI(-/-), p53(-/-), and p21(-/-) mice. Further studies demonstrated that rhIL-1Ra promoted the cell cycle arrest of intestinal crypt epithelia (ICE) through elevating the cellular level of p21(WAF1) and p27(KIP1), which was abolished in IL-1RI(-/-) and p53(-/-) mice, and in p21(WAF1) and p27(KIP1) silenced IEC-6 cells. Importantly, the tumor growth and sensitivity to chemotherapy were not affected by rhIL-1Ra in cultures of tumor cell lines and in a syngeneic tumor-transplantation mouse model. The present study demonstrated that rhIL-1Ra effectively and specifically protected ICE from chemotoxicity through reversible reduction of the basal level of IL-1 signaling to promote normal cell cycle arrest, but not tumor cells. Our findings support the clinical development of rhIL-1Ra in the prevention of CIM.
This study identified an insulin-like peptide (ILP) in Macrobrachium rosenbergii termed Mr-ILP and further investigated its function through glucose injection and RNAi. With the analysis of five other glucose metabolism related genes, this study shed light on the molecular mechanism of carbohydrate metabolism in crustaceans. Mr-ILP shared the typical skeleton with six conserved cysteine and mainly expressed in neuroendocrine system. In M. rosenbergii, the elevated hemolymph glucose concentration after glucose injection returned to basal levels in short time, implying an efficient regulatory system in carbohydrate metabolism. Hyperglycemic related genes answered the elevated hemolymph glucose concentration quickly with significant decreased expression level, while Mr-ILP showed delayed response. Instead, glycolysis increased after glucose injection, which indicated glycolysis might play an important role in lowering the abnormally high glucose level. In vivo silencing of Mr-ILP, by injecting the prawns with double-stranded RNA (dsRNA) for 21 days reduced its expression by approximately 75%. Accordingly, glycogen synthase decreased and the trehalose and glycogen level in the hepatopancreas were significantly reduced, indicating the function of Mr-ILP in oligosaccharide and polysaccharide accumulation. When Mr-ILP was silenced, the expression of hyperglycemic related genes were enhanced, but the hemolymph glucose level was not elevated significantly, which might attribute to the increased glycolysis to keep a balanced glucose level in hemolymph.
Type 2 diabetes (T2D) is associated with a strongly increased risk for restenosis after angioplasty driven by proliferation of vascular smooth muscle cells (VSMCs). Here, we sought to determine whether and how mitochondrial dysfunction in T2D drives VSMC proliferation with a focus on ROS and intracellular [Ca 2+ ] that both drive cell proliferation, occur in T2D and are regulated by mitochondrial activity.
Two-pore K(+) channels have emerged as potential targets to selectively regulate cardiac cell membrane excitability; however, lack of specific inhibitors and relevant animal models has impeded the effort to understand the role of 2-pore K(+) channels in the heart and their potential as a therapeutic target. The objective of this study was to determine the role of mechanosensitive 2-pore K(+) channel family member TREK-1 in control of cardiac excitability.
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