MAPK信號(hào)轉(zhuǎn)導(dǎo)途徑在蜜蜂毒誘致的炎癥與疼痛中的作用機(jī)制研究
[Abstract]:BACKGROUND: Inflammation caused by peripheral tissue injury is accompanied by pain (persistent spontaneous pain, hyperalgesia, tenderness, etc.) and obvious inflammation such as red, swollen, and hot. Our previous studies have shown that subcutaneous injection of bee venom solution into the center of the hind plantar of rats can not only produce significant persistent spontaneous pain, but also produce significant thermal and mechanical effects. A large number of studies have shown that MAP (mitogen-activated protein kinase) is associated with pain and inflammation, and ERK1/2 and P38 play different roles in tissue and nerve injury-induced pain, heat and mechanical hyperalgesia.
OBJECTIVE: To investigate the mechanism of MAPK signaling pathway in inflammation and pain induced by honeybee venom by observing the effects of ERK1/2, P38 and MEK inhibitors on spontaneous pain, mechanical hyperalgesia and inflammation induced by subcutaneous injection of honeybee venom. To provide new theoretical information and ideas.
Materials and Methods: Bee venom (BV) was used as a subcutaneous injection model to study the effects of MAPK on spontaneous pain, mechanical pain and inflammation in rats. Male SD rats weighing 250-300 grams were given different doses of ERK1/2 subcutaneously for 10 minutes. PD98059, P38 inhibitor SB202190 and MEK1/2 inhibitor U0126 were injected subcutaneously into the plantar of hind limbs (0.2mg/50l). The control group was injected with PD98059, SB202190 and U0126 (50ml/rat, DMSO:PBS=3:7). In order to exclude the systemic effect of the drug, the contralateral subcutaneous injection was performed 10 minutes earlier. Higher doses of PD98059 (100ug), SB202190 (100ug/50ugl) and U0126 (10ug/50ugl) were used to observe the spontaneous pain behavior (foot retraction) in rats within 1 hour after bee venom injection, and the time point was 5 minutes. The mechanical stimulator fibers were used to detect the mechanical stimulus response threshold of rats'paws before and 2 hours after bee venom injection. Paw withdrawal mechanical threshold (PWMT) and YLS-7A toe volume meter were used to measure the paw volume before and 3 hours after bee venom injection.
Result:
(1) Effect on spontaneous pain: ipsilateral and contralateral SB202190 treatment group: no effect on the spontaneous systolic reflex induced by honey bee venom; ipsilateral PD98059 treatment group: the spontaneous systolic reflex induced by honey bee venom was significantly inhibited, and in the later period (26-60 minutes) more obvious, no significant dose-dependent, contralateral PD98059 treatment group: on the venom induced by honey bee venom Ipsilateral U0126 treatment group: low dose U0126 had facilitation effect on spontaneous shrinkage reflex in early and late stage, medium dose 1ug had no effect on spontaneous shrinkage reflex, high dose 10ug had no effect on spontaneous shrinkage reflex in early stage, but had obvious inhibition effect in late stage. The spontaneous retraction reflex had no effect.
(2) The effect on pain sensitivity: ipsilateral and contralateral PD98059 treatment group: no effect on the decrease of mechanical stimulation threshold induced by bee venom; ipsilateral SB202190 treatment group: the decline of mechanical stimulation threshold induced by bee venom reversed, and there was no significant dose dependence between different doses, while the ipsilateral SB202190 treatment on bee. The decrease of mechanical stimulation threshold induced by bee venom had no effect, and the decrease of mechanical stimulation threshold induced by bee venom was not affected by ipsilateral and contralateral U0126 treatments.
(3) Inflammation: ipsilateral or contralateral PD98059 treatment group: no significant effect on the increase of paw volume caused by bee venom; ipsilateral SB202190 treatment group: high dose (100ug) can significantly inhibit the increase of paw volume caused by bee venom injection, while low dose (1ug and 10ug) and contralateral SB202190 treatment group: on the increase of paw volume caused by bee venom The same side or contralateral U0126 treatment group had no significant effect on the increase of rat paw volume caused by bee venom.
Conclusion:
(1) MEK1/2-MAPK signal transduction pathway mediates persistent spontaneous foot shrinkage induced by honeybee venom, and its expression level is related to persistent spontaneous foot shrinkage induced by honeybee venom: a certain level of MEK1/2 expression may inhibit but not predispose spontaneous pain induced by honeybee venom, while high level of MEK1/2 expression may promote honeybee venom. P38-MAPK signal transduction pathway was not involved in the mediation of persistent spontaneous pain induced by bee venom. ERK1/2-MAPK signal transduction pathway was involved in the persistent spontaneous contraction reflex induced by bee venom.
(2) Peripheral P38-MAPK signal transduction pathway is involved in mechanical hyperalgesia induced by bee venom, but not dose-dependent. MEK1/2-ERK1/2 MAPK signal transduction pathway is not involved in mechanical hyperalgesia induced by bee venom.
(3) ERK-MEK MAPK signaling pathway did not participate in the inflammation induced by bee venom, but P38 was involved in the inflammation induced by bee venom in a dose-dependent manner.
【學(xué)位授予單位】:大連醫(yī)科大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2007
【分類號(hào)】:R363
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