Peripheral delta opioid receptors require priming for functional competence in vivo

MP Rowan, NB Ruparel, AM Patwardhan… - European journal of …, 2009 - Elsevier
Although centrally acting opioid analgesics produce profound antinociception under basal
conditions, the antinociceptive properties of peripherally restricted opioid analgesics are …

Cytokine regulation in animal models of neuropathic pain and in human diseases

N Üçeyler, C Sommer - Neuroscience letters, 2008 - Elsevier
Cytokines are soluble proteins secreted mainly by immune cells and are key players in the
induction and maintenance of pain. Pro-inflammatory cytokines are mostly algesic, while anti …

Endogenous opioid-mediated analgesia is dependent on adaptive T cell response in mice

J Boué, C Blanpied, P Brousset… - The Journal of …, 2011 - journals.aai.org
Pain is an inherent component of inflammation often accompanying immune response. A
large spectrum of molecules released within the inflamed tissue induces pain by stimulating …

Characterization of μ opioid receptor binding and G protein coupling in rat hypothalamus, spinal cord, and primary afferent neurons during inflammatory pain

MA Shaqura, C Zöllner, SA Mousa, C Stein… - Journal of Pharmacology …, 2004 - ASPET
Peripheral analgesic effects of opioids are pronounced under inflammatory conditions, eg,
arthritis; however, little is known about adaptive changes of μ opioid receptor binding and G …

Neuropathic pain and cytokines: current perspectives

AK Clark, EA Old, M Malcangio - Journal of pain research, 2013 - Taylor & Francis
Neuropathic pain represents a major problem in clinical medicine because it causes
debilitating suffering and is largely resistant to currently available analgesics. A …

Immunomodulatory effects of endogenous and synthetic peptides activating opioid receptors

DK Pomorska, K Gach… - Mini reviews in medicinal …, 2014 - ingentaconnect.com
The main role of endogenous opioid peptides is the modulation of pain. Opioid peptides
exert their analgesic activity by binding to the opioid receptors distributed widely in the …

Bradykinin-induced functional competence and trafficking of the δ-opioid receptor in trigeminal nociceptors

AM Patwardhan, KA Berg, AN Akopain… - Journal of …, 2005 - Soc Neuroscience
Peripheral opioid analgesia is increased substantially after inflammation. We evaluated the
hypothesis that an inflammatory mediator, bradykinin (BK), evokes functional competence of …

Local peripheral opioid effects and expression of opioid genes in the spinal cord and dorsal root ganglia in neuropathic and inflammatory pain

I Obara, JR Parkitna, M Korostynski, W Makuch… - Pain, 2009 - journals.lww.com
We investigated the efficacy of local intraplantar (i. pl.) injection of peptide and non-peptide μ-
, δ-and κ-opioid receptor agonists in rat models of inflammatory and neuropathic pain …

Pain and the immune system: friend or foe?

HL Rittner, A Brack, C Stein - Der Anaesthesist, 2002 - europepmc.org
When tissue is destroyed, pain arises. Tissue destruction as well as wound healing are
associated with an inflammatory reaction. This leads to activation of nociceptors (" pain …

Sustained suppression of hyperalgesia during latent sensitization by μ-, δ-, and κ-opioid receptors and α2A adrenergic receptors: role of constitutive activity

WM Walwyn, W Chen, H Kim, A Minasyan… - Journal of …, 2016 - Soc Neuroscience
Many chronic pain disorders alternate between bouts of pain and periods of remission. The
latent sensitization model reproduces this in rodents by showing that the apparent recovery …