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Fagan RR, Lee DF, Geron M, Scherrer G, von Zastrow M, Ehrlich AT. Selective targeting of mu opioid receptors to primary cilia. Cell Rep 2024; 43:114164. [PMID: 38678559 PMCID: PMC11257377 DOI: 10.1016/j.celrep.2024.114164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 03/21/2024] [Accepted: 04/11/2024] [Indexed: 05/01/2024] Open
Abstract
Opioid receptors are therapeutically important G protein-coupled receptors (GPCRs) with diverse neuromodulatory effects. The functional consequences of opioid receptor activation are known to depend on receptor location in the plasma membrane, but mechanisms mediating selective localization of receptors to any particular membrane domain remain elusive. Here, we demonstrate the targeting of the mu opioid receptor (MOR) to the primary cilium, a discrete microdomain of the somatic plasma membrane, both in vivo and in cultured cells. We further show that ciliary targeting is specific to MORs, requires a 17-residue sequence unique to the MOR cytoplasmic tail, and additionally requires the Tubby-like protein 3 (TULP3) ciliary adaptor protein. Our results reveal the potential for opioid receptors to undergo selective localization to the primary cilium. We propose that ciliary targeting is mediated through an elaboration of the recycling pathway, directed by a specific C-terminal recycling sequence in cis and requiring TULP3 in trans.
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Affiliation(s)
- Rita R Fagan
- Department of Psychiatry and Behavioral Sciences, University of California, San Francisco, San Francisco, CA 94158, USA
| | - David F Lee
- Department of Cell Biology and Physiology, UNC Neuroscience Center, Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Matan Geron
- Department of Cell Biology and Physiology, UNC Neuroscience Center, Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Grégory Scherrer
- Department of Cell Biology and Physiology, UNC Neuroscience Center, Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; New York Stem Cell Foundation, Chapel Hill, NC 27599, USA
| | - Mark von Zastrow
- Department of Psychiatry and Behavioral Sciences, University of California, San Francisco, San Francisco, CA 94158, USA.
| | - Aliza T Ehrlich
- Department of Psychiatry and Behavioral Sciences, University of California, San Francisco, San Francisco, CA 94158, USA.
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Jakubík J, El-Fakahany EE. Allosteric Modulation of GPCRs of Class A by Cholesterol. Int J Mol Sci 2021; 22:1953. [PMID: 33669406 PMCID: PMC7920425 DOI: 10.3390/ijms22041953] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 02/11/2021] [Accepted: 02/12/2021] [Indexed: 12/16/2022] Open
Abstract
G-protein coupled receptors (GPCRs) are membrane proteins that convey extracellular signals to the cellular milieu. They represent a target for more than 30% of currently marketed drugs. Here we review the effects of membrane cholesterol on the function of GPCRs of Class A. We review both the specific effects of cholesterol mediated via its direct high-affinity binding to the receptor and non-specific effects mediated by cholesterol-induced changes in the properties of the membrane. Cholesterol binds to many GPCRs at both canonical and non-canonical binding sites. It allosterically affects ligand binding to and activation of GPCRs. Additionally, it changes the oligomerization state of GPCRs. In this review, we consider a perspective of the potential for the development of new therapies that are targeted at manipulating the level of membrane cholesterol or modulating cholesterol binding sites on to GPCRs.
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Affiliation(s)
- Jan Jakubík
- Department of Neurochemistry, Institute of Physiology Czech Academy of Sciences, 142 20 Prague, Czech Republic
| | - Esam E. El-Fakahany
- Department of Experimental and Clinical Pharmacology, University of Minnesota College of Pharmacy, Minneapolis, MN 55455, USA
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Lunde S, Nguyen HT, Petersen KK, Arendt-Nielsen L, Krarup HB, Søgaard-Andersen E. Chronic Postoperative Pain After Hysterectomy for Endometrial Cancer: A Metabolic Profiling Study. Mol Pain 2020; 16:1744806920923885. [PMID: 32375547 PMCID: PMC7227146 DOI: 10.1177/1744806920923885] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
INTRODUCTION One out of seven women will develop a state of chronic postoperative pain following robot-assisted hysterectomy for endometrial cancer. Recently, metabolic studies have indicated that circulating lipids and lipoproteins could act as nociceptive modulators and thereby influence the induction and perpetuation of pain. The objectives of this explorative study were (1) to examine the preoperative serologic variations in concentrations of lipids, lipoproteins, and various low-molecular metabolites in patients with and without chronic postoperative pain after robot-assisted hysterectomy and (2) to explore if any of these serological biomarkers were predictive for development of chronic postoperative pain. MATERIALS AND METHODS The study was designed as a nested case-control study within a cohort of women treated for endometrial cancer with robot-assisted laparoscopic hysterectomy. Twenty-six women with chronic postoperative pain were matched on age and body mass index with fifty-two controls without chronic postoperative pain, and metabolic profiling of preoperatively drawn blood samples from a biobank was performed by means of nuclear magnetic resonance spectroscopy. RESULTS Nineteen metabolites, including cholesterol, cholesteryl ester, linoleic acid, phospholipids, lipids, and triglycerides had statistically significant higher concentrations in a subgroup of patients who would develop chronic postoperative pain on a later stage compared to the group of patients who would not develop chronic postoperative pain (p < 0.05). A sparse Partial Least Squares-Discriminant Analysis model explained 38.1% of the variance and had a predictive accuracy of 73.1%. CONCLUSIONS This explorative study substantiates the hypothesis that certain lipids, lipoproteins, and fatty acids are associated with chronic postoperative pain.
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Affiliation(s)
- Søren Lunde
- Department of Obstetrics and Gynecology, Aalborg University Hospital, Aalborg, Denmark
| | - Hien Tt Nguyen
- Department of Molecular Diagnostics, Aalborg University Hospital, Aalborg, Denmark
| | - Kristian K Petersen
- Center for Sensory-Motor Interaction, Center for Neuroplasticity and Pain, Department of Health Science and Technology, The Faculty of Medicine, Aalborg University, Aalborg, Denmark
| | - Lars Arendt-Nielsen
- Center for Sensory-Motor Interaction, Center for Neuroplasticity and Pain, Department of Health Science and Technology, The Faculty of Medicine, Aalborg University, Aalborg, Denmark
| | - Henrik B Krarup
- Department of Molecular Diagnostics, Aalborg University Hospital, Aalborg, Denmark
| | - Erik Søgaard-Andersen
- Department of Obstetrics and Gynecology, Aalborg University Hospital, Aalborg, Denmark
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Oh TK, Kang SB, Song IA, Hwang JW, Do SH, Kim JH, Oh AY. Is preoperative hypocholesterolemia a risk factor for severe postoperative pain? Analysis of 1,944 patients after laparoscopic colorectal cancer surgery. J Pain Res 2018; 11:1057-1065. [PMID: 29910634 PMCID: PMC5989703 DOI: 10.2147/jpr.s152961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Purpose This study aimed to identify the effect of preoperative serum total cholesterol on postoperative pain outcome in patients who had undergone laparoscopic colorectal cancer surgery. Methods We retrospectively reviewed the medical records of patients diagnosed with colorectal cancer who had undergone laparoscopic colorectal surgery from January 1, 2011, to June 30, 2017, to identify the relationship of total cholesterol levels within a month prior to surgery with the numeric rating scale (NRS) scores and total opioid consumption on postoperative days (PODs) 0–2. Results We included 1,944 patients. No significant correlations were observed between total cholesterol and the NRS (POD 0), NRS (POD 1), and oral morphine equivalents (PODs 0–2) (P>0.05). There was no significant difference between the low (<160 mg/dL), medium (160–199 mg/dL), and high (≥200 mg/dL) groups in NRS scores on PODs 0, 1, or 2 (P>0.05). Furthermore, there was no significant association in multivariate linear regression analysis for postoperative opioid consumption according to preoperative serum total cholesterol level (coefficient 0.08, 95% CI −0.01 to 0.18, P=0.81). Conclusion This study showed that there was no meaningful association between preoperative total cholesterol level and postoperative pain outcome after laparoscopic colorectal cancer surgery.
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Affiliation(s)
- Tak Kyu Oh
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital
| | - Sung-Bum Kang
- Department of Surgery, Seoul National University Bundang Hospital, Seoul, South Korea
| | - In-Ae Song
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital
| | - Jung-Won Hwang
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital
| | - Sang-Hwan Do
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital
| | - Jin Hee Kim
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital
| | - Ah-Young Oh
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital
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David M, Lebrun C, Duguet T, Talmont F, Beech R, Orlowski S, André F, Prichard RK, Lespine A. Structural model, functional modulation by ivermectin and tissue localization of Haemonchus contortus P-glycoprotein-13. Int J Parasitol Drugs Drug Resist 2018; 8:145-157. [PMID: 29571165 PMCID: PMC6114108 DOI: 10.1016/j.ijpddr.2018.02.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 02/09/2018] [Accepted: 02/12/2018] [Indexed: 12/18/2022]
Abstract
Haemonchus contortus, one of the most economically important parasites of small ruminants, has become resistant to the anthelmintic ivermectin. Deciphering the role of P-glycoproteins in ivermectin resistance is desirable for understanding and overcoming this resistance. In the model nematode, Caenorhabditis elegans, P-glycoprotein-13 is expressed in the amphids, important neuronal structures for ivermectin activity. We have focused on its ortholog in the parasite, Hco-Pgp-13. A 3D model of Hco-Pgp-13, presenting an open inward-facing conformation, has been constructed by homology with the Cel-Pgp-1 crystal structure. In silico docking calculations predicted high affinity binding of ivermectin and actinomycin D to the inner chamber of the protein. Following in vitro expression, we showed that ivermectin and actinomycin D modulated Hco-Pgp-13 ATPase activity with high affinity. Finally, we found in vivo Hco-Pgp-13 localization in epithelial, pharyngeal and neuronal tissues. Taken together, these data suggest a role for Hco-Pgp-13 in ivermectin transport, which could contribute to anthelmintic resistance.
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Affiliation(s)
- Marion David
- INTHERES, Université de Toulouse, INRA, ENVT, Toulouse, France; Institute of Parasitology, McGill University, Sainte-Anne-De-Bellevue, Canada
| | - Chantal Lebrun
- INTHERES, Université de Toulouse, INRA, ENVT, Toulouse, France
| | - Thomas Duguet
- Institute of Parasitology, McGill University, Sainte-Anne-De-Bellevue, Canada
| | - Franck Talmont
- Institute of Pharmacology and Structural Biology, UMR 5089, CNRS, Toulouse, France
| | - Robin Beech
- Institute of Parasitology, McGill University, Sainte-Anne-De-Bellevue, Canada
| | - Stéphane Orlowski
- CEA, Institut de Biologie Frédéric Joliot, Centre de Saclay, SB2SM, UMR9198 CNRS, I2BC; 91191 Gif-sur-Yvette Cedex, France
| | - François André
- CEA, Institut de Biologie Frédéric Joliot, Centre de Saclay, SB2SM, UMR9198 CNRS, I2BC; 91191 Gif-sur-Yvette Cedex, France
| | - Roger K Prichard
- Institute of Parasitology, McGill University, Sainte-Anne-De-Bellevue, Canada.
| | - Anne Lespine
- INTHERES, Université de Toulouse, INRA, ENVT, Toulouse, France.
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Oh TK, Kim HH, Park DJ, Ahn SH, Do SH, Hwang JW, Kim JH, Oh AY, Jeon YT, Song IA. Association of Preoperative Serum Total Cholesterol Level with Postoperative Pain Outcomes after Laparoscopic Surgery for Gastric Cancer. Pain Pract 2018; 18:729-735. [PMID: 29168284 DOI: 10.1111/papr.12659] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Accepted: 11/12/2017] [Indexed: 11/30/2022]
Abstract
BACKGROUND Opioid usage is reportedly increased in patients with advanced cancer and low total cholesterol (TC). The aim of this study was to determine the effects of preoperative serum TC levels on postoperative opioid usage in patients undergoing laparoscopic gastric cancer surgery. METHODS We retrospectively analyzed the medical records of patients with gastric cancer who underwent laparoscopic gastrectomy at our institution between January 1, 2011 and July 31, 2017. We investigated the correlation between TC levels in the month before surgery and numeric rating scale (NRS) scores and opioid consumption on postoperative days (PODs) 0 to 3. The patients were stratified according to preoperative TC level (< 160 mg/dL, low; 160 to 199 mg/dL, medium; ≥ 200 mg/dL, high). RESULTS TC and NRS scores (PODs 0, 1) for 1,919 eligible patients showed weak but significant positive coefficients (0.074 and 0.098 on POD 0 and POD 1, respectively, P < 0.01). After adjusting for confounders, there were no significant differences in postoperative NRS scores on PODs 0, 1, 2, or 3 or in oral morphine equivalents on PODs 0 to 3 according to TC level. CONCLUSION Preoperative serum TC levels have no effect on pain outcomes in the 3 days following laparoscopic gastric surgery.
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Affiliation(s)
- Tak Kyu Oh
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea
| | - Hyung-Ho Kim
- Department of Surgery, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea
| | - Do Joong Park
- Department of Surgery, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea
| | - Sang-Hoon Ahn
- Department of Surgery, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea
| | - Sang-Hwan Do
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea
| | - Jung-Won Hwang
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea
| | - Jin Hee Kim
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea
| | - Ah-Young Oh
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea
| | - Young-Tae Jeon
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea
| | - In-Ae Song
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea
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Abstract
The opioid receptor family, with associated endogenous ligands, has numerous roles throughout the body. Moreover, the delta opioid receptor (DORs) has various integrated roles within the physiological systems, including the cardiovascular system. While DORs are important modulators of cardiovascular autonomic balance, they are well-established contributors to cardioprotective mechanisms. Both endogenous and exogenous opioids acting upon DORs have roles in myocardial hibernation and protection against ischaemia-reperfusion (I-R) injury. Downstream signalling mechanisms governing protective responses alternate, depending on the timing and duration of DOR activation. The following review describes models and mechanisms of DOR-mediated cardioprotection, the impact of co-morbidities and challenges for clinical translation.
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Affiliation(s)
- Louise See Hoe
- Menzies Health Institute Queensland, Griffith University, Southport, QLD, 4222, Australia
- Critical Care Research Group, The Prince Charles Hospital and The University of Queensland, Chermside, QLD, Australia
| | - Hemal H Patel
- VA San Diego Healthcare System, San Diego, CA, USA
- Department of Anesthesiology, University of California San Diego, La Jolla, CA, USA
| | - Jason N Peart
- Menzies Health Institute Queensland, Griffith University, Southport, QLD, 4222, Australia.
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Huang Z, Liang L, Li L, Xu M, Li X, Sun H, He S, Lin L, Zhang Y, Song Y, Yang M, Luo Y, Loh HH, Law PY, Zheng D, Zheng H. Opioid doses required for pain management in lung cancer patients with different cholesterol levels: negative correlation between opioid doses and cholesterol levels. Lipids Health Dis 2016; 15:47. [PMID: 26952011 PMCID: PMC4782347 DOI: 10.1186/s12944-016-0212-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 02/24/2016] [Indexed: 02/01/2023] Open
Abstract
Background Pain management has been considered as significant contributor to broad quality-of-life improvement for cancer patients. Modulating serum cholesterol levels affects analgesia abilities of opioids, important pain killer for cancer patients, in mice system. Thus the correlation between opioids usages and cholesterol levels were investigated in human patients with lung cancer. Methods Medical records of 282 patients were selected with following criteria, 1) signed inform consent, 2) full medical records on total serum cholesterol levels and opioid administration, 3) opioid-naïve, 4) not received/receiving cancer-related or cholesterol lowering treatment, 5) pain level at level 5–8. The patients were divided into different groups basing on their gender and cholesterol levels. Since different opioids, morphine, oxycodone, and fentanyl, were all administrated at fixed low dose initially and increased gradually only if pain was not controlled, the percentages of patients in each group who did not respond to the initial doses of opioids and required higher doses for pain management were determined and compared. Results Patients with relative low cholesterol levels have larger percentage (11 out of 28 in female and 31 out of 71 in male) to not respond to the initial dose of opioids than those with high cholesterol levels (0 out of 258 in female and 8 out of 74 in male). Similar differences were obtained when patients with different opioids were analyzed separately. After converting the doses of different opioids to equivalent doses of oxycodone, significant correlation between opioid usages and cholesterol levels was also observed. Conclusions Therefore, more attention should be taken to those cancer patients with low cholesterol levels because they may require higher doses of opioids as pain killer. Electronic supplementary material The online version of this article (doi:10.1186/s12944-016-0212-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Zhenhua Huang
- Department of Oncology, Nanfang Hospital, Southern Medical University, #1838 Guangzhou Ave. N, Guangzhou, 510515, China.
| | - Lining Liang
- CAS Key Laboratory of Regenerative Biology, Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, A-131, #190 Kaiyuan Ave, Guangzhou, 510530, China.
| | - Lingyu Li
- CAS Key Laboratory of Regenerative Biology, Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, A-131, #190 Kaiyuan Ave, Guangzhou, 510530, China. .,Anhui University, Hefei, 230601, China.
| | - Miao Xu
- Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine, #651 Dongfeng East Ave, Guangzhou, 510060, China.
| | - Xiang Li
- CAS Key Laboratory of Regenerative Biology, Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, A-131, #190 Kaiyuan Ave, Guangzhou, 510530, China.
| | - Hao Sun
- CAS Key Laboratory of Regenerative Biology, Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, A-131, #190 Kaiyuan Ave, Guangzhou, 510530, China.
| | - Songwei He
- CAS Key Laboratory of Regenerative Biology, Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, A-131, #190 Kaiyuan Ave, Guangzhou, 510530, China.
| | - Lilong Lin
- CAS Key Laboratory of Regenerative Biology, Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, A-131, #190 Kaiyuan Ave, Guangzhou, 510530, China.
| | - Yixin Zhang
- CAS Key Laboratory of Regenerative Biology, Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, A-131, #190 Kaiyuan Ave, Guangzhou, 510530, China.
| | - Yancheng Song
- The third hospital, Southern Medical University, #183 Zhongshan Ave. E, Guangzhou, 510665, China.
| | - Man Yang
- Department of Neurology, Nanfang Hospital, Southern Medical University, #1838 Guangzhou Ave. N, Guangzhou, 510515, China.
| | - Yuling Luo
- Department of Oncology, Nanfang Hospital, Southern Medical University, #1838 Guangzhou Ave. N, Guangzhou, 510515, China.
| | - Horace H Loh
- Department of Pharmacology, University of Minnesota, Minneapolis, Minnesota, 6-120 Jackson Hall, 321 Church St. SE, Minneapolis, MN, 55455, USA.
| | - Ping-Yee Law
- Department of Pharmacology, University of Minnesota, Minneapolis, Minnesota, 6-120 Jackson Hall, 321 Church St. SE, Minneapolis, MN, 55455, USA.
| | - Dayong Zheng
- Department of Oncology, Nanfang Hospital, Southern Medical University, #1838 Guangzhou Ave. N, Guangzhou, 510515, China.
| | - Hui Zheng
- CAS Key Laboratory of Regenerative Biology, Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, A-131, #190 Kaiyuan Ave, Guangzhou, 510530, China.
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Zheng H, Pearsall EA, Hurst DP, Zhang Y, Chu J, Zhou Y, Reggio PH, Loh HH, Law PY. Palmitoylation and membrane cholesterol stabilize μ-opioid receptor homodimerization and G protein coupling. BMC Cell Biol 2012; 13:6. [PMID: 22429589 PMCID: PMC3317874 DOI: 10.1186/1471-2121-13-6] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2011] [Accepted: 03/19/2012] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND A cholesterol-palmitoyl interaction has been reported to occur in the dimeric interface of the β₂-adrenergic receptor crystal structure. We sought to investigate whether a similar phenomenon could be observed with μ-opioid receptor (OPRM1), and if so, to assess the role of cholesterol in this class of G protein-coupled receptor (GPCR) signaling. RESULTS C3.55(170) was determined to be the palmitoylation site of OPRM1. Mutation of this Cys to Ala did not affect the binding of agonists, but attenuated receptor signaling and decreased cholesterol associated with the receptor signaling complex. In addition, both attenuation of receptor palmitoylation (by mutation of C3.55[170] to Ala) and inhibition of cholesterol synthesis (by treating the cells with simvastatin, a HMG-CoA reductase inhibitor) impaired receptor signaling, possibly by decreasing receptor homodimerization and Gαi2 coupling; this was demonstrated by co-immunoprecipitation, immunofluorescence colocalization and fluorescence resonance energy transfer (FRET) analyses. A computational model of the OPRM1 homodimer structure indicated that a specific cholesterol-palmitoyl interaction can facilitate OPRM1 homodimerization at the TMH4-TMH4 interface. CONCLUSIONS We demonstrate that C3.55(170) is the palmitoylation site of OPRM1 and identify a cholesterol-palmitoyl interaction in the OPRM1 complex. Our findings suggest that this interaction contributes to OPRM1 signaling by facilitating receptor homodimerization and G protein coupling. This conclusion is supported by computational modeling of the OPRM1 homodimer.
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Affiliation(s)
- Hui Zheng
- Department of Pharmacology, University of Minnesota, Minneapolis, Minnesota 55455, USA.
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Thompson AA, Liu JJ, Chun E, Wacker D, Wu H, Cherezov V, Stevens RC. GPCR stabilization using the bicelle-like architecture of mixed sterol-detergent micelles. Methods 2011; 55:310-7. [PMID: 22041719 DOI: 10.1016/j.ymeth.2011.10.011] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Revised: 10/18/2011] [Accepted: 10/18/2011] [Indexed: 12/30/2022] Open
Abstract
The biophysical characterization of purified membrane proteins typically requires detergent mediated extraction from native lipid membrane environments. In the case of human G protein-coupled receptors (GPCRs), this process has been complicated by their conformational heterogeneity and the general lack of understanding the composition and interactions within the diverse human cellular membrane environment. Several successful GPCR structure determination efforts have shown that the addition of cholesterol analogs is often critical for maintaining protein stability. We have identified sterols that substantially increase the stability of the NOP receptor (ORL-1), a member of the opioid GPCR family, in a mixed micelle environment. Using dynamic light scattering and small-angle X-ray scattering, we have determined that the most thermal stabilizing sterol, cholesteryl hemisuccinate, induces the formation of a bicelle-like micelle architecture when mixed with dodecyl maltoside detergent. Together with mutagenesis studies and recent GPCR structures, our results provide indications that stabilization is attained through a combination of specific sterol binding to GPCRs and modulation of micelle morphology.
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Affiliation(s)
- Aaron A Thompson
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
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11
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Saulière-Nzeh Ndong A, Saulière-Nzeh AN, Millot C, Corbani M, Mazères S, Lopez A, Salomé L. Agonist-selective dynamic compartmentalization of human Mu opioid receptor as revealed by resolutive FRAP analysis. J Biol Chem 2010; 285:14514-20. [PMID: 20197280 DOI: 10.1074/jbc.m109.076695] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Techniques for analyzing the membrane diffusion of molecules are the most promising methods for investigating the compartmentalization of G-protein-coupled receptors, particularly as relevant to receptor signaling processes. Here, we report fluorescence recovery after photobleaching (FRAP) measurements performed at variable spot radius for human mu opioid (hMOP) receptors on SH-SY5Y neuroblastoma cells in the presence of ligands. Although an antagonist did not affect the behavior of the receptors compared with the basal state, two different agonists, DAMGO and morphine, caused markedly different changes to receptor diffusion. Like receptors in the absence of ligand, receptors bound to morphine exhibited diffusion confined to joined semipermeable domains, but with smaller domain size and diffusion coefficient. This effect was inhibited by pertussis toxin, strongly suggesting that this dynamic behavior is associated with early steps of signaling. In the presence of DAMGO, half of the receptors displayed free long-range diffusion and the other half were confined to smaller isolated domains. Hypertonic sucrose buffer suppressed this effect, which we attribute to receptor entry into clathrin-coated pits. It is likely that the observation of distinct receptor dynamics in the presence of DAMGO and morphine involves the agonist-selective phosphorylation of the receptor.
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Affiliation(s)
- Aude Saulière-Nzeh Ndong
- IPBS (Institute of Pharmacology and Structural Biology), CNRS, 205 route de Narbonne, F-31077 Toulouse, France
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12
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Abstract
This paper is the 31st consecutive installment of the annual review of research concerning the endogenous opioid system. It summarizes papers published during 2008 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior (Section 2), and the roles of these opioid peptides and receptors in pain and analgesia (Section 3); stress and social status (Section 4); tolerance and dependence (Section 5); learning and memory (Section 6); eating and drinking (Section 7); alcohol and drugs of abuse (Section 8); sexual activity and hormones, pregnancy, development and endocrinology (Section 9); mental illness and mood (Section 10); seizures and neurologic disorders (Section 11); electrical-related activity and neurophysiology (Section 12); general activity and locomotion (Section 13); gastrointestinal, renal and hepatic functions (Section 14); cardiovascular responses (Section 15); respiration and thermoregulation (Section 16); and immunological responses (Section 17).
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, 65-30 Kissena Blvd, Flushing, NY 11367, United States.
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13
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Eisinger DA, Ammer H. Down-regulation of c-Cbl by morphine accounts for persistent ERK1/2 signaling in delta-opioid receptor-expressing HEK293 cells. J Biol Chem 2009; 284:34819-28. [PMID: 19828455 DOI: 10.1074/jbc.m109.042937] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Opioids display ligand-specific differences in the time course of ERK1/2 signaling. Whereas full agonists, like etorphine, induce only transient activation of ERK1/2, the partial agonist morphine mediates persistent stimulation of mitogenic signaling. Here we report that in stably delta-opioid receptor (DOR)-expressing HEK293 (HEK/DOR) cells, the transient nature of etorphine-induced ERK1/2 signaling is due to desensitization of epidermal growth factor (EGF) receptor-mediated activation of the Ras/Raf-1/ERK1/2 cascade. Desensitization of ERK1/2 activity by etorphine is associated with down-regulation of EGF receptors, an effect mediated by the ubiquitin ligase c-Cbl. In contrast, chronic morphine treatment failed to desensitize EGF receptors, resulting in unimpeded ERK1/2 signaling. The failure of morphine to desensitize ERK1/2 signaling is mediated by persistent activation of c-Src, which induces degradation of c-Cbl. The role of c-Src in opioid-specific ERK1/2 signaling is further demonstrated by pretreatment of the cells with PP2 and SKI-I as well as overexpression of a dominant negative c-Src mutant (c-Src(dn)) or a c-Src-resistant c-Cbl mutant (CblY3F), both of which facilitate desensitization of ERK1/2 signaling by morphine. Conversely, overexpression of c-Src as well as down-regulation of c-Cbl by small interfering RNA results in persistent etorphine-induced stimulation of ERK1/2 activity. Subcellular fractionation experiments finally attributed the ability of morphine to persistently activate c-Src to its redistribution from Triton X-100-insensitive membrane rafts to DOR and EGF receptor containing high density membrane compartments implicated in ERK1/2 signaling. These results demonstrate that agonist-specific differences in the temporal and spatial pattern of c-Src activation determine the kinetics of DOR-mediated regulation of ERK1/2 signaling.
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Affiliation(s)
- Daniela A Eisinger
- Institute of Pharmacology, Toxicology and Pharmacy, Ludwig-Maximilians-University Munich, 80539 Muenchen, Germany.
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14
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Lopez A, Salomé L. Membrane functional organisation and dynamic of mu-opioid receptors. Cell Mol Life Sci 2009; 66:2093-108. [PMID: 19300905 PMCID: PMC11115522 DOI: 10.1007/s00018-009-0008-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2008] [Revised: 02/17/2009] [Accepted: 02/18/2009] [Indexed: 12/30/2022]
Abstract
The activation and signalling activity of the membrane mu-opioid receptor (MOP-R) involve interactions among the receptor, G-proteins, effectors and many other membrane or cytosolic proteins. Decades of investigation have led to identification of the main biochemical processes, but the mechanisms governing the successive protein-protein interactions have yet to be established. We will need to unravel the dynamic membrane organisation of this complex and multifaceted molecular machinery if we are to understand these mechanisms. Here, we review and discuss advances in our understanding of the signalling mechanism of MOP-R resulting from biochemical or biophysical studies of the organisation of this receptor in the plasma membrane.
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Affiliation(s)
- André Lopez
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne, 31077 Toulouse, France
- Université de Toulouse, UPS, IPBS, 31077 Toulouse, France
| | - Laurence Salomé
- CNRS, IPBS (Institut de Pharmacologie et de Biologie Structurale), 205 route de Narbonne, 31077 Toulouse, France
- Université de Toulouse, UPS, IPBS, 31077 Toulouse, France
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15
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Wetzel G, Heine M, Rohwedder A, Naim HY. Impact of glycosylation and detergent-resistant membranes on the function of intestinal sucrase-isomaltase. Biol Chem 2009; 390:545-9. [DOI: 10.1515/bc.2009.077] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Sucrase-isomaltase (SI) is a highly N- and O-glycosylated intestinal brush border membrane protein. SI is sorted with high fidelity to the apical membrane via O-linked glycans that mediate its association with lipid rafts or detergent-resistant membranes (DRMs). Here, we show that N- and O-glycosylation and DRMs are implicated in the regulation of the function of SI in intestinal Caco-2 cells. The activities of sucrase (SUC) and isomaltase (IM) increase substantially in DRMs when N- and O-glycosylation patterns are intact. Disruption of DRMs by solubilization with Triton X-100 at 37°C substantially reduces the activities of SUC and IM. Furthermore, modulation of O-glycosylation by benzyl-2-acetamido-2-deoxy-α-d-galactopyranoside and N-glycosylation by deoxymannojirimycin is linked to a decreased capacity of SI to associate with DRMs, with a subsequent reduction of the enzymatic activities of SUC and IM. This is the first report that reveals a direct role of N- and O-glycans in association with DRMs in regulating the function of a membrane glycoprotein.
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16
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Levitt ES, Clark MJ, Jenkins PM, Martens JR, Traynor JR. Differential effect of membrane cholesterol removal on mu- and delta-opioid receptors: a parallel comparison of acute and chronic signaling to adenylyl cyclase. J Biol Chem 2009; 284:22108-22122. [PMID: 19520863 DOI: 10.1074/jbc.m109.030411] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
According to the lipid raft theory, the plasma membrane contains small domains enriched in cholesterol and sphingolipid, which may serve as platforms to organize membrane proteins. Using methyl-beta-cyclodextrin (MbetaCD) to deplete membrane cholesterol, many G protein-coupled receptors have been shown to depend on putative lipid rafts for proper signaling. Here we examine the hypothesis that treatment of HEK293 cells stably expressing FLAG-tagged mu-opioid receptors (HEK FLAG-mu) or delta-opioid receptors (HEK FLAG-delta) with MbetaCD will reduce opioid receptor signaling to adenylyl cyclase. The ability of the mu-opioid agonist [D-Ala2,N-Me-Phe4,Gly5-ol]enkephalin to acutely inhibit adenylyl cyclase or to cause sensitization of adenylyl cyclase following chronic treatment was attenuated with MbetaCD. These effects were due to removal of cholesterol, because replenishment of cholesterol restored [D-Ala2,N-Me-Phe4,Gly5-ol]enkephalin responses back to control values, and were confirmed in SH-SY5Y cells endogenously expressing mu-opioid receptors. The effects of MbetaCD may be due to uncoupling of the mu receptor from G proteins but were not because of decreases in receptor number and were not mimicked by cytoskeleton disruption. In contrast to the results in HEK FLAG-mu cells, MbetaCD treatment of HEK FLAG-delta cells had no effect on acute inhibition or sensitization of adenylyl cyclase by delta-opioid agonists. The differential responses of mu- and delta-opioid agonists to cholesterol depletion suggest that mu-opioid receptors are more dependent on cholesterol for efficient signaling than delta receptors and can be partly explained by localization of mu- but not delta-opioid receptors in cholesterol- and caveolin-enriched membrane domains.
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Affiliation(s)
| | - Mary J Clark
- Department of Pharmacology, Ann Arbor, Michigan 48109
| | | | | | - John R Traynor
- Department of Pharmacology, Ann Arbor, Michigan 48109; Substance Abuse Research Center, University of Michigan, Ann Arbor, Michigan 48109
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Neuropeptide FF-sensitive confinement of mu opioid receptor does not involve lipid rafts in SH-SY5Y cells. Biochem Biophys Res Commun 2008; 373:80-4. [DOI: 10.1016/j.bbrc.2008.05.174] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2008] [Accepted: 05/30/2008] [Indexed: 12/12/2022]
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