PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 11683901-3 2001 We have reported that the development of morphine tolerance significantly increased calcitonin-gene-related-peptide-like immunoreactivity (CGRP-IR) in primary sensory afferents of the spinal dorsal horn, suggesting that changes in pain-related neuropeptides in the dorsal root ganglion (DRG) neurons may be involved (Menard et al., 1996, J. Morphine 41-49 calcitonin-related polypeptide alpha Rattus norvegicus 139-143 11683901-5 2001 Recently, we have shown that repeated morphine treatments induced increases in CGRP- and substance P (SP)-IR in cultured DRG, mimicking the in vivo effects (Ma et al., 2000, Neuroscience, 99, 529-539). Morphine 38-46 calcitonin-related polypeptide alpha Rattus norvegicus 79-83 11683901-6 2001 In this study, we investigated the intracellular signal transduction pathways possibly involved in morphine-induced increases in CGRP- and SP-IR in DRG neurons. Morphine 99-107 calcitonin-related polypeptide alpha Rattus norvegicus 129-144 11683901-10 2001 Naloxone effectively blocked these actions of morphine, whereas a selective MEK1 inhibitor, PD98059, inhibited the morphine-induced increase in the phosphorylation of ERK and CREB, and the expression of CGRP and SP. Morphine 46-54 calcitonin-related polypeptide alpha Rattus norvegicus 203-207 11683901-10 2001 Naloxone effectively blocked these actions of morphine, whereas a selective MEK1 inhibitor, PD98059, inhibited the morphine-induced increase in the phosphorylation of ERK and CREB, and the expression of CGRP and SP. Morphine 115-123 calcitonin-related polypeptide alpha Rattus norvegicus 203-207 11683901-11 2001 Moreover, in morphine-tolerant rats, the number of pCREB-, CGRP- and SP-IR neurons in the lumbar DRG was also significantly increased. Morphine 13-21 calcitonin-related polypeptide alpha Rattus norvegicus 59-74 11683901-12 2001 These in vitro and in vivo data suggest that the phosphorylation of MAP kinases and CREB plays a role in the morphine-induced increase in spinal CGRP and SP levels in primary sensory afferents, contributing to the development of tolerance to opioid-induced analgesia. Morphine 109-117 calcitonin-related polypeptide alpha Rattus norvegicus 145-149