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3 �� 0.6?s, indicating the development of thermal hyperalgesia (n= 39, P http://en.wikipedia.org/wiki/SWAP70 did not produce a significant increase in PWL compared to vehicle (P= 0.06), and this was further observed at day 11 when the mean PWL in the morphine group was 16.7 �� 2.0?s (P= 0.14), demonstrating a decrease in antihyperalgesic efficacy. The morphine challenge at day 15, after 3 treatment-free days, resulted in a PWL of 20.0 �� 2.6?s (P= 0.002). Animals treated with http://www.selleckchem.com/products/BIBW2992.html TY005 withdrew the hind paw at significantly longer latencies compared to the post-injury value and vehicle-treated rats on all days of treatment (n= 16, Figure?5E); the peak antihyperalgesic effect of TY005 was observed at day 5 of treatment and corresponded to the PWL of 24.5 �� 1.7?s (Figure?5E). After 11 days, TY005 treatment did not result in the development of antinociceptive tolerance in SNL-operated rats. When treatment was discontinued for 3 days, PWLs returned to post-injury levels (days 12�C14). TY005 (10??g in 5??L, i.t.) was administered as a challenge at day 15, and the resulting mean PWL was 21.0 �� 1.7?s; this was significantly higher than vehicle-treated animals, but not when compared to morphine treatment (P= 0.004 and P= 0.75, respectively). The present study demonstrates the in vivo activity of a rationally designed peptide that takes advantage of two distinct mechanisms in order to attenuate acute and chronic pain. We have shown in non-injured rats that targeting the ?- and ��-opioid receptors while blocking the NK1 receptor results in antinociception, as well as antihyperalgesia http://www.selleckchem.com/products/BKM-120.html in a rodent model of neuropathic pain. More importantly, unlike morphine, spinal TY005 fully attenuated nerve injury-induced tactile allodynia. Finally, we demonstrated that multiple i.t. administrations of our multifunctional peptide did not result in the development of antinociceptive tolerance nor sedation. Acute nociceptive pain arising from tissue injury or noxious input is reasonably well controlled with opioids. Neuroplastic adaptations within pain pathways, from injury or chronic opioid exposure, can lead to an alteration of transmission and ultimately a change in processing of the pain signal (Vanderah, 2007; Seybold, 2009).