The role of Mrgprs in substance P-induced itch

描述（由申请人提供）：P物质在瘙痒和神经源性炎症中起关键作用。这种神经肽被认为通过NK1受体介导其作用。出乎意料的是，我们发现P物质是人MrgX2和小鼠MrgA1的有效激动剂，Mrgpr受体家族的同源成员与瘙痒和伤害感受密切相关。在Mrg敲除小鼠中，SP诱发的抓挠减少至基线。我们推测，人MrgprX2和小鼠MrgprA1在SP诱导的瘙痒中起关键作用。评估这一假设有可能通过提供新的见解来理解瘙痒的基本机制，同时确定治疗靶点，从而为那些患有瘙痒的人提供新的药物，从而实现变革。

DESCRIPTION (provided by applicant): Substance P plays critical roles in itch and neurogenic inflammation. This neuropeptide has been thought to mediate its actions via the NK1 receptor. Unexpectedly, we have found that substance P is a potent agonist of human MrgX2 and mouse MrgA1, homologous members of the Mrgpr family of receptors that been linked strongly to itch and nociception. SP-evoked scratching is reduced to baseline in Mrg knockout mice. We hypothesize that human MrgprX2 and mouse MrgprA1 play critical roles in SP-induced itch. Evaluating this hypothesis has the potential to be transformative by providing new insights into understanding the basic mechanisms of itch while identifying therapeutic targets leading to new medications for those who suffer from itch.