Neuropeptide W(NPW),an endogenous ligand for the G-protein coupled receptor NBPWR,is produced in neurons known to be important in the control of food intake and the neuroendocrine response to stress in central nerve...
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Neuropeptide W(NPW),an endogenous ligand for the G-protein coupled receptor NBPWR,is produced in neurons known to be important in the control of food intake and the neuroendocrine response to stress in central nerve *** the periphery,NPW is also expressed and makes some biological functions,including intracellular calcium ***,we found NPW’s receptor NBPWR1 was coexpressed with Ca V1.2 calcium channel in arterial smooth muscle,implying its roles in the Ca V1.2 of arterial smooth *** whole-cell patch clamp,NPW-23,the active form of NPW,could concentration-dependently increase the calcium currents(ICa,L)in heterolozagously transfected HEK 293 cells and isolated vascular smooth muscle *** system was used to explore the physiological function of NPW-23 in arterial constriction,we found the mesenteric arterial wall exhibited increased vascular tone when given NPW-23into the bath *** above data indicated that NPW-23 regulated ICa,L in vascular smooth muscle cells,and such a mechanism may play a role in modulating vascular constriction.
目的研究蛋白激酶Mζ(PKMζ)对慢性内脏痛大鼠痛觉敏感性的影响并探讨其脊髓作用机制。方法采用将出生后第2~21天的SD大鼠每天固定母婴分离3小时的方法建立慢性内脏痛模型,通过测量成年大鼠(8周后)腹外斜肌对结直肠扩张(CRD)引起的放电反应来选择建模成功的大鼠进行研究。采用western blot方法观察PKMζ及磷酸化PKMζ在模型大鼠脊髓胸腰段和腰骶段的表达情况。在椎管插管术7天后选择活动自如并经过利多卡因筛选的模型大鼠和正常大鼠;观察单次鞘内注射不同剂量PKMζ抑制剂ZIP前后,腹外斜肌在不同压力CRD下放电幅值的差异。另外,采用旷场试验检测PKMζ抑制剂ZIP对模型和正常大鼠运动功能的影响。结果 1.与正常大鼠比较,慢性内脏痛模型大鼠腹外斜肌放电幅值显著增加(P<0.01)即模型大鼠内脏痛敏反应显著高于对照大鼠;同时模型大鼠远端降结肠及直肠局部组织未见明显病理改变。2.通过western blot的方法观察结果显示,与正常大鼠相比,PKMζ在慢性内脏痛大鼠脊髓胸腰段和腰骶段的表达无明显变化;而磷酸化PKMζ在慢性内脏痛大鼠脊髓胸腰段和腰骶段的表达显著高于正常大鼠。3.鞘内注射ZIP,可剂量依赖性显著降低慢性内脏痛大鼠内脏痛敏反应,且最佳作用时间约为给药后0.5 h。1正常大鼠鞘内注射不同剂量PKMζ抑制剂ZIP前后,在20-80 mm Hg CRD压力下腹外斜肌放电幅值差异均无统计学意义;2慢性内脏痛模型大鼠鞘内注射1μg ZIP前后,在20-80 mm Hg CRD压力下腹外斜肌放电幅值差异无统计学意义;鞘内注射5μg和10μg ZIP前后,在20 mm Hg CRD压力下腹外斜肌放电幅值差异无统计学意义,而在40-80 mm Hg CRD压力下腹外斜肌放电幅值差异有统计学意义(P<0.05)。3采用旷场试验检测发现,鞘内注射10μg PKMζ抑制剂ZIP对模型和正常大鼠的运动功能影响无显著差异。结论:磷酸化PKMζ可能参与了大鼠慢性内脏痛脊髓中枢敏化的形成。
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