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Pandey M, Zhang JH, Adikaram PR, Kittock C, Lue N, Awe A, Degner K, Jacob N, Staples J, Thomas R, Kohnen AB, Ganesan S, Kabat J, Chen CK, Simonds WF. Specific regulation of mechanical nociception by Gβ5 involves GABA-B receptors. JCI Insight 2023; 8:e134685. [PMID: 37219953 PMCID: PMC10371342 DOI: 10.1172/jci.insight.134685] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 05/19/2023] [Indexed: 05/24/2023] Open
Abstract
Mechanical, thermal, and chemical pain sensation is conveyed by primary nociceptors, a subset of sensory afferent neurons. The intracellular regulation of the primary nociceptive signal is an area of active study. We report here the discovery of a Gβ5-dependent regulatory pathway within mechanical nociceptors that restrains antinociceptive input from metabotropic GABA-B receptors. In mice with conditional knockout (cKO) of the gene that encodes Gβ5 (Gnb5) targeted to peripheral sensory neurons, we demonstrate the impairment of mechanical, thermal, and chemical nociception. We further report the specific loss of mechanical nociception in Rgs7-Cre+/- Gnb5fl/fl mice but not in Rgs9-Cre+/- Gnb5fl/fl mice, suggesting that Gβ5 might specifically regulate mechanical pain in regulator of G protein signaling 7-positive (Rgs7+) cells. Additionally, Gβ5-dependent and Rgs7-associated mechanical nociception is dependent upon GABA-B receptor signaling since both were abolished by treatment with a GABA-B receptor antagonist and since cKO of Gβ5 from sensory cells or from Rgs7+ cells potentiated the analgesic effects of GABA-B agonists. Following activation by the G protein-coupled receptor Mrgprd agonist β-alanine, enhanced sensitivity to inhibition by baclofen was observed in primary cultures of Rgs7+ sensory neurons harvested from Rgs7-Cre+/- Gnb5fl/fl mice. Taken together, these results suggest that the targeted inhibition of Gβ5 function in Rgs7+ sensory neurons might provide specific relief for mechanical allodynia, including that contributing to chronic neuropathic pain, without reliance on exogenous opioids.
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Affiliation(s)
- Mritunjay Pandey
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Jian-Hua Zhang
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Poorni R. Adikaram
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Claire Kittock
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Nicole Lue
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Adam Awe
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Katherine Degner
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Nirmal Jacob
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Jenna Staples
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Rachel Thomas
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Allison B. Kohnen
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), Bethesda, Maryland, USA
| | - Sundar Ganesan
- Research Technologies Branch, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland, USA
| | - Juraj Kabat
- Research Technologies Branch, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, Maryland, USA
| | - Ching-Kang Chen
- Department of Molecular Medicine, The University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | - William F. Simonds
- Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (NIH), Bethesda, Maryland, USA
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2
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Luo Z, Yu G, Han X, Liu Y, Wang G, Li X, Yang H, Sun W. Exploring the Active Components of Simotang Oral Liquid and Their Potential Mechanism of Action on Gastrointestinal Disorders by Integrating Ultrahigh-Pressure Liquid Chromatography Coupled with Linear Ion Trap-Orbitrap Analysis and Network Pharmacology. ACS OMEGA 2021; 6:2354-2366. [PMID: 33521474 PMCID: PMC7841926 DOI: 10.1021/acsomega.0c05680] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 12/29/2020] [Indexed: 05/08/2023]
Abstract
Simotang oral liquid (SMT), a well-known traditional Chinese medicine formula composed of four medicinal and edible plants, has been extensively used for treating gastrointestinal disorders (GIDs) since ancient times. However, the major active constituents and the underlying molecular mechanism of SMT on GIDs are still partially understood. Herein, the preliminary chemical profile of SMT was first identified by ultrahigh-pressure liquid chromatography coupled with linear ion trap-Orbitrap tandem mass spectrometry (UHPLC-LTQ-Orbitrap). In total, 70 components were identified. Then, a network pharmacology approach integrating target prediction, pathway enrichment analysis, and network construction was adopted to explore the therapeutic mechanism of SMT. As a result, 170 main targets were screened out and considered as effective players in ameliorating GIDs. More importantly, the major hubs were found to be highly enriched in a calcium signaling pathway. Furthermore, 26 core SMT-related genes were identified, which may play key roles in ameliorating gastrointestinal motility. In conclusion, this work would provide valuable information for further development and clinical application of SMT.
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Affiliation(s)
- Zhiqiang Luo
- School
of Life Sciences, Beijing University of
Chinese Medicine, Beijing 102488, China
| | - Guohua Yu
- School
of Life Sciences, Beijing University of
Chinese Medicine, Beijing 102488, China
| | - Xing Han
- School
of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Yang Liu
- School
of Chinese Materia Medica, Beijing University
of Chinese Medicine, Beijing 102488, China
- . Fax: +86 1084738611. Tel: +86 13810283092
| | - Guopeng Wang
- Zhongcai
Health (Beijing) Biological Technology Development Co., Ltd., Beijing 101500, China
| | - Xueyan Li
- School
of Chinese Materia Medica, Beijing University
of Chinese Medicine, Beijing 102488, China
| | - Haiyang Yang
- School
of Chinese Materia Medica, Beijing University
of Chinese Medicine, Beijing 102488, China
| | - Wenyan Sun
- School
of Chinese Materia Medica, Beijing University
of Chinese Medicine, Beijing 102488, China
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5
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Zhou C, Li J, Liu L, Tang Z, Wan F, Lan L. Expression and localization of MrgprD in mouse intestinal tract. Cell Tissue Res 2019; 377:259-268. [PMID: 30919047 PMCID: PMC6647478 DOI: 10.1007/s00441-019-03017-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 03/09/2019] [Indexed: 12/16/2022]
Abstract
MrgprD, a Mas-related G protein-coupled receptor, is initially identified in sensory neurons of mouse dorsal root ganglia (DRG) and has been suggested to participate in somatosensation. However, MrgprD has recently been found to be expressed outside the nervous system such as in aortic endothelia cells and neutrophils. In this study, we used immunohistochemistry to detect the expression and localization of MrgprD in mouse intestinal tract. The immunoreactivity (IR) of MrgprD was found in the smooth muscle layers of small intestine, colon and rectum. In addition, MrgprD IR was colocalized with F4/80-positive macrophages and CD3-positive T lymphocytes resident in the lamina propria of intestinal mucosa. MrgprD was also found to be expressed in primary peritoneal macrophages and splenic T lymphocytes. Furthermore, the presence of MrgprD mRNA and its protein was detected in murine macrophage-like RAW 264.7 and human T lymphocyte Jurkat cell lines. Our study shows, for the first time, the expression and localization of MrgprD in the intestinal tract and in macrophages and T lymphocytes, indicating the potential roles of MrgprD in intestinal mobility and immunity.
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Affiliation(s)
- Chenxing Zhou
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, 210023 Jiangsu People’s Republic of China
| | - Jia Li
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, 210023 Jiangsu People’s Republic of China
| | - Lin Liu
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, 210023 Jiangsu People’s Republic of China
| | - Zongxiang Tang
- Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, 210023 Jiangsu People’s Republic of China
| | - Fengyi Wan
- Department of Biochemistry and Molecular Biology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205 USA
- Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205 USA
- Department of Oncology and Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD 21205 USA
| | - Lei Lan
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, 210023 Jiangsu People’s Republic of China
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Wang C, Gu L, Ruan Y, Geng X, Xu M, Yang N, Yu L, Jiang Y, Zhu C, Yang Y, Zhou Y, Guan X, Luo W, Liu Q, Dong X, Yu G, Lan L, Tang Z. Facilitation of MrgprD by TRP-A1 promotes neuropathic pain. FASEB J 2018; 33:1360-1373. [PMID: 30148678 DOI: 10.1096/fj.201800615rr] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Neuropathic pain remains a therapeutic challenge because of its complicated mechanisms. Mas-related GPCR D (MrgprD) is specifically expressed in small-diameter, nociceptive neurons of dorsal root ganglia (DRGs) and is implicated in pain modulation. However, the underlying mechanism of MrgprD involved in neuropathic pain remains elusive. In this study, we used behavioral experiments and physiologic examination methods to investigate the role of MrgprD in chronic constriction injury (CCI)-induced neuropathic pain. We found that MrgprD is necessary for the initiation of mechanical hypersensitivity and cold allodynia, but not for heat allodynia. Moreover, we demonstrated that transient receptor potential cation channel (TRP)-A1 was the ion channel downstream of MrgprD, and the β-alanine-induced calcium signal was attributed mostly to TRP-A1 function. We further showed that PKA serves as a downstream mediator of β-alanine-activated MrgprD signaling to activate TRP-A1 in DRG neurons and in human embryonic kidney 293 cells, to coexpress MrgprD and TRP-A1 plasmids. Finally, we found that the β-alanine-induced pain behavior was increased, whereas the itching behavior was unchanged in CCI models compared with sham-injured animals. Knockout of TRPA1 also attenuated the β-alanine-induced pain behavior in CCI models. In conclusion, MrgprD is essential in cold allodynia in CCI-induced neuropathic pain through the PKA-TRP-A1 pathway. TRP-A1 facilitates MrgprD to development of neuropathic pain. Our findings reveal a novel mechanism of neuropathic pain formation and highlight MrgprD as a promising drug target for the treatment of neuropathic pain.-Wang, C., Gu, L., Ruan, Y., Geng, X., Xu, M., Yang, N., Yu, L., Jiang, Y., Zhu, C., Yang, Y., Zhou, Y., Guan, X., Luo, W., Liu, Q., Dong, X., Yu, G., Lan, L., Tang, Z. Facilitation of MrgprD by TRP-A1 promotes neuropathic pain.
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Affiliation(s)
- Changming Wang
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, Nanjing University of Chinese Medicine, Nanjing, China.,State Key Laboratory Cultivation Base for Traditional Chinese Medicine Quality and Efficacy, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Drug Target and Drug for Degenerative Disease of Jiangsu Province, Nanjing University of Chinese Medicine, Nanjing, China
| | - Leying Gu
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, Nanjing University of Chinese Medicine, Nanjing, China.,State Key Laboratory Cultivation Base for Traditional Chinese Medicine Quality and Efficacy, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Drug Target and Drug for Degenerative Disease of Jiangsu Province, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yonglan Ruan
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, Nanjing University of Chinese Medicine, Nanjing, China.,State Key Laboratory Cultivation Base for Traditional Chinese Medicine Quality and Efficacy, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Drug Target and Drug for Degenerative Disease of Jiangsu Province, Nanjing University of Chinese Medicine, Nanjing, China
| | - Xiao Geng
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, Nanjing University of Chinese Medicine, Nanjing, China.,State Key Laboratory Cultivation Base for Traditional Chinese Medicine Quality and Efficacy, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Drug Target and Drug for Degenerative Disease of Jiangsu Province, Nanjing University of Chinese Medicine, Nanjing, China
| | - Miao Xu
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Niuniu Yang
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Department of Traditional Chinese and Western Medicine, Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou University, Yangzhou, China
| | - Lei Yu
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yucui Jiang
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, Nanjing University of Chinese Medicine, Nanjing, China
| | - Chan Zhu
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, Nanjing University of Chinese Medicine, Nanjing, China.,State Key Laboratory Cultivation Base for Traditional Chinese Medicine Quality and Efficacy, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Drug Target and Drug for Degenerative Disease of Jiangsu Province, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yan Yang
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, Nanjing University of Chinese Medicine, Nanjing, China.,State Key Laboratory Cultivation Base for Traditional Chinese Medicine Quality and Efficacy, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Drug Target and Drug for Degenerative Disease of Jiangsu Province, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yuan Zhou
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, Nanjing University of Chinese Medicine, Nanjing, China.,State Key Laboratory Cultivation Base for Traditional Chinese Medicine Quality and Efficacy, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Drug Target and Drug for Degenerative Disease of Jiangsu Province, Nanjing University of Chinese Medicine, Nanjing, China
| | - Xiaowei Guan
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, Nanjing University of Chinese Medicine, Nanjing, China.,State Key Laboratory Cultivation Base for Traditional Chinese Medicine Quality and Efficacy, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Drug Target and Drug for Degenerative Disease of Jiangsu Province, Nanjing University of Chinese Medicine, Nanjing, China
| | - Wenqin Luo
- Department of Neuroscience, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Qin Liu
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri, USA.,Center for the Study of Itch, Washington University School of Medicine, St. Louis, Missouri, USA.,Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Xinzhong Dong
- The Solomon H. Snyder Department of Neuroscience, Center for Sensory Biology, School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA; and.,Howard Hughes Medical Institute, School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA
| | - Guang Yu
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, Nanjing University of Chinese Medicine, Nanjing, China.,State Key Laboratory Cultivation Base for Traditional Chinese Medicine Quality and Efficacy, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Drug Target and Drug for Degenerative Disease of Jiangsu Province, Nanjing University of Chinese Medicine, Nanjing, China
| | - Lei Lan
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Zongxiang Tang
- School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Chinese Medicine for Prevention and Treatment of Neurological Diseases, Nanjing University of Chinese Medicine, Nanjing, China.,State Key Laboratory Cultivation Base for Traditional Chinese Medicine Quality and Efficacy, Nanjing University of Chinese Medicine, Nanjing, China.,Key Laboratory of Drug Target and Drug for Degenerative Disease of Jiangsu Province, Nanjing University of Chinese Medicine, Nanjing, China
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9
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Bader M, Alenina N, Andrade-Navarro MA, Santos RA. MAS and its related G protein-coupled receptors, Mrgprs. Pharmacol Rev 2015; 66:1080-105. [PMID: 25244929 DOI: 10.1124/pr.113.008136] [Citation(s) in RCA: 131] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The Mas-related G protein-coupled receptors (Mrgprs or Mas-related genes) comprise a subfamily of receptors named after the first discovered member, Mas. For most Mrgprs, pruriception seems to be the major function based on the following observations: 1) they are relatively promiscuous in their ligand specificity with best affinities for itch-inducing substances; 2) they are expressed in sensory neurons and mast cells in the skin, the main cellular components of pruriception; and 3) they appear in evolution first in tetrapods, which have arms and legs necessary for scratching to remove parasites or other noxious substances from the skin before they create harm. Because parasites coevolved with hosts, each species faced different parasitic challenges, which may explain another striking observation, the multiple independent duplication and expansion events of Mrgpr genes in different species as a consequence of parallel adaptive evolution. Their predominant expression in dorsal root ganglia anticipates additional functions of Mrgprs in nociception. Some Mrgprs have endogenous ligands, such as β-alanine, alamandine, adenine, RF-amide peptides, or salusin-β. However, because the functions of these agonists are still elusive, the physiologic role of the respective Mrgprs needs to be clarified. The best studied Mrgpr is Mas itself. It was shown to be a receptor for angiotensin-1-7 and to exert mainly protective actions in cardiovascular and metabolic diseases. This review summarizes the current knowledge about Mrgprs, their evolution, their ligands, their possible physiologic functions, and their therapeutic potential.
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Affiliation(s)
- Michael Bader
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany (M.B., N.A., M.A.A.-N.); Charité-University Medicine, Berlin, Germany (M.B.); Institute for Biology, University of Lübeck, Lübeck, Germany (M.B.); and Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil (M.B., N.A., R.A.S.)
| | - Natalia Alenina
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany (M.B., N.A., M.A.A.-N.); Charité-University Medicine, Berlin, Germany (M.B.); Institute for Biology, University of Lübeck, Lübeck, Germany (M.B.); and Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil (M.B., N.A., R.A.S.)
| | - Miguel A Andrade-Navarro
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany (M.B., N.A., M.A.A.-N.); Charité-University Medicine, Berlin, Germany (M.B.); Institute for Biology, University of Lübeck, Lübeck, Germany (M.B.); and Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil (M.B., N.A., R.A.S.)
| | - Robson A Santos
- Max-Delbrück-Center for Molecular Medicine, Berlin, Germany (M.B., N.A., M.A.A.-N.); Charité-University Medicine, Berlin, Germany (M.B.); Institute for Biology, University of Lübeck, Lübeck, Germany (M.B.); and Department of Physiology and Biophysics, Federal University of Minas Gerais, Belo Horizonte, Brazil (M.B., N.A., R.A.S.)
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