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Rahmouni K. Neural Circuits Underlying Reciprocal Cardiometabolic Crosstalk: 2023 Arthur C. Corcoran Memorial Lecture. Hypertension 2024; 81:1233-1243. [PMID: 38533662 PMCID: PMC11096079 DOI: 10.1161/hypertensionaha.124.22066] [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] [Indexed: 03/28/2024]
Abstract
The interplay of various body systems, encompassing those that govern cardiovascular and metabolic functions, has evolved alongside the development of multicellular organisms. This evolutionary process is essential for the coordination and maintenance of homeostasis and overall health by facilitating the adaptation of the organism to internal and external cues. Disruption of these complex interactions contributes to the development and progression of pathologies that involve multiple organs. Obesity-associated cardiovascular risks, such as hypertension, highlight the significant influence that metabolic processes exert on the cardiovascular system. This cardiometabolic communication is reciprocal, as indicated by substantial evidence pointing to the ability of the cardiovascular system to affect metabolic processes, with pathophysiological implications in disease conditions. In this review, I outline the bidirectional nature of the cardiometabolic interaction, with special emphasis on the impact that metabolic organs have on the cardiovascular system. I also discuss the contribution of the neural circuits and autonomic nervous system in mediating the crosstalk between cardiovascular and metabolic functions in health and disease, along with the molecular mechanisms involved.
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Affiliation(s)
- Kamal Rahmouni
- Department of Neuroscience and Pharmacology, University of Iowa Carver College of Medicine, Iowa City, Iowa
- Veterans Affairs Health Care System, Iowa City, Iowa
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa
- Fraternal Order of Eagles Diabetes Research Center, University of Iowa Carver College of Medicine, Iowa City, Iowa
- Obesity Research and Education Initiative, University of Iowa Carver College of Medicine, Iowa City, Iowa
- Iowa Neuroscience Institute, University of Iowa Carver College of Medicine, Iowa City, Iowa
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Song WJ, Cheon DH, Song H, Jung D, Chan Park H, Yeong Hwang J, Choi HJ, NamKoong C. Activation of ChAT+ neuron in dorsal motor vagus (DMV) increases blood glucose through the regulation of hepatic gene expression in mice. Brain Res 2024; 1829:148770. [PMID: 38266888 DOI: 10.1016/j.brainres.2024.148770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 01/10/2024] [Accepted: 01/13/2024] [Indexed: 01/26/2024]
Abstract
The brain and peripheral organs communicate through hormones and neural connections. Proper communication is required to maintain normal whole-body energy homeostasis. In addition to endocrine system, from the perspective of neural connections for metabolic homeostasis, the role of the sympathetic nervous system has been extensively studied, but understanding of the parasympathetic nervous system is limited. The liver plays a central role in glucose and lipid metabolism. This study aimed to clarify the innervation of parasympathetic nervous system in the liver and its functional roles in metabolic homeostasis. The liver-specific parasympathetic nervous system innervation (PNS) was shown by tissue clearing, immunofluorescence and transgenic mice at the three-dimensional histological level. The parasympathetic efferent signals were manipulated using a chemogenetic technique and the activation of ChAT+ parasympathetic neurons in dorsal motor vagus (DMV) results in the increased blood glucose through the elevated hepatic gluconeogenic and lipogenic gene expression in the liver. Thus, our study showed the evidence of ChAT+ parasympathetic neurons in the liver and its role for hepatic parasympathetic nervous signaling in glucose homeostasis through the regulation of hepatic gene expression.
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Affiliation(s)
- Woo-Jin Song
- Functional Neuroanatomy of Metabolism Regulation Laboratory, Department of Anatomy, Division of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Deok-Hyeon Cheon
- Functional Neuroanatomy of Metabolism Regulation Laboratory, Department of Anatomy, Division of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - HeeIn Song
- Functional Neuroanatomy of Metabolism Regulation Laboratory, Department of Anatomy, Division of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Daeun Jung
- Functional Neuroanatomy of Metabolism Regulation Laboratory, Department of Anatomy, Division of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Hae Chan Park
- Functional Neuroanatomy of Metabolism Regulation Laboratory, Department of Anatomy, Division of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Ju Yeong Hwang
- Functional Neuroanatomy of Metabolism Regulation Laboratory, Department of Anatomy, Division of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Hyung-Jin Choi
- Functional Neuroanatomy of Metabolism Regulation Laboratory, Department of Anatomy, Division of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Republic of Korea; BK21Plus Biomedical Science Project Team, Seoul National University College of Medicine, Seoul, Republic of Korea; Wide River Institute of Immunology, Seoul National University College of Medicine, Hongchoen, Republic of Korea; Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea.
| | - Cherl NamKoong
- Functional Neuroanatomy of Metabolism Regulation Laboratory, Department of Anatomy, Division of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea; Core Research Laboratory, Medical Science Institute, Kyung Hee University Hospital at Gangdong, Seoul 05278, Republic of Korea.
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Zoccal DB, Vieira BN, Mendes LR, Evangelista AB, Leirão IP. Hypoxia sensing in the body: An update on the peripheral and central mechanisms. Exp Physiol 2024; 109:461-469. [PMID: 38031809 PMCID: PMC10988761 DOI: 10.1113/ep091206] [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: 09/29/2023] [Accepted: 11/15/2023] [Indexed: 12/01/2023]
Abstract
An adequate supply of O2 is essential for the maintenance of cellular activity. Systemic or local hypoxia can be experienced during decreased O2 availability or associated with diseases, or a combination of both. Exposure to hypoxia triggers adjustments in multiple physiological systems in the body to generate appropriate homeostatic responses. However, with significant reductions in the arterial partial pressure of O2, hypoxia can be life-threatening and cause maladaptive changes or cell damage and death. To mitigate the impact of limited O2 availability on cellular activity, O2 chemoreceptors rapidly detect and respond to reductions in the arterial partial pressure of O2, triggering orchestrated responses of increased ventilation and cardiac output, blood flow redistribution and metabolic adjustments. In mammals, the peripheral chemoreceptors of the carotid body are considered to be the main hypoxic sensors and the primary source of excitatory feedback driving respiratory, cardiovascular and autonomic responses. However, current evidence indicates that the CNS contains specialized brainstem and spinal cord regions that can also sense hypoxia and stimulate brain networks independently of the carotid body inputs. In this manuscript, we review the discoveries about the functioning of the O2 chemoreceptors and their contribution to the monitoring of O2 levels in the blood and brain parenchyma and mounting cardiorespiratory responses to maintain O2 homeostasis. We also discuss the implications of the chemoreflex-related mechanisms in paediatric and adult pathologies.
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Affiliation(s)
- Daniel B. Zoccal
- Department of Physiology and Pathology, School of Dentistry of AraraquaraSão Paulo State University (UNESP)AraraquaraSão PauloBrazil
| | - Beatriz N. Vieira
- Department of Physiology and Pathology, School of Dentistry of AraraquaraSão Paulo State University (UNESP)AraraquaraSão PauloBrazil
| | - Letícia R. Mendes
- Department of Physiology and Pathology, School of Dentistry of AraraquaraSão Paulo State University (UNESP)AraraquaraSão PauloBrazil
| | - Andressa B. Evangelista
- Department of Physiology and Pathology, School of Dentistry of AraraquaraSão Paulo State University (UNESP)AraraquaraSão PauloBrazil
| | - Isabela P. Leirão
- Department of Physiology and Pathology, School of Dentistry of AraraquaraSão Paulo State University (UNESP)AraraquaraSão PauloBrazil
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