Central mu, delta, and kappa opioid binding sites, and brain and pituitary beta-endorphin and met-enkephalin in genetically obese (ob/ob) and lean mice
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Dynorphin/Kappa Opioid Receptor Signaling in Preclinical Models of Alcohol, Drug, and Food Addiction
2017, International Review of NeurobiologyCitation Excerpt :The concentration of KOR binding sites was observed to be 2.7-fold higher in ob/ob compared to lean mice. In addition, dynorphin tissue content was observed to be 12-fold lower in the pituitary of obese mice (Khawaja, Bailey, & Green, 1989). However, another study showed an increase in dynorphin immunoreactivity in the posterior pituitary.
Inhibition of opioid systems in the hypothalamus as well as the mesolimbic area suppresses feeding behavior of mice
2015, NeuroscienceCitation Excerpt :Some studies have shown a close association between obesity and changes in the opioid system, particularly μ-opioid receptors (Rossier et al., 1979; Haghighi et al., 2014). Moreover, μ-opioid receptors are down-regulated in genetically obese (ob/ob) mice compared to lean mice (Khawaja et al., 1989). Taken together, these results suggest that the ineffectiveness of naltrexone is likely to be due to changes in μ-opioid systems in obesity.
Attenuated pain response of obese mice (B6.Cg-lep<sup>ob</sup>) is affected by aging and leptin but not sex
2014, Physiology and BehaviorCitation Excerpt :Leptin plays a role in many processes, including weight regulation [4], POMC production [33], obesity [34], diabetes [35,36], glucocorticoids [37], endogenous opioids [38] and endocannabinoids [12]. Obesity and diabetes have been associated with altered nociception in humans and rodents [1,3], as have glucocorticoids [39], endogenous opioids [40] and endocannabinoids [27]). One possible method of leptin's action is through POMC.
Changes in metabolic-related variables during chronic morphine treatment
2010, Neurochemistry InternationalOrally administered H-Dmt-Tic-Lys-NH-CH<inf>2</inf>-Ph (MZ-2), a potent μ-/δ-opioid receptor antagonist, regulates obese-related factors in mice
2009, European Journal of PharmacologyLeptin and the control of obesity
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