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Ikegami K. Circadian rhythm of intraocular pressure. J Physiol Sci 2024; 74:14. [PMID: 38431563 PMCID: PMC10908160 DOI: 10.1186/s12576-024-00905-8] [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: 11/09/2023] [Accepted: 02/04/2024] [Indexed: 03/05/2024]
Abstract
Intraocular pressure (IOP) plays a crucial role in glaucoma development, involving the dynamics of aqueous humor (AH). AH flows in from the ciliary body and exits through the trabecular meshwork (TM). IOP follows a circadian rhythm synchronized with the suprachiasmatic nucleus (SCN), the circadian pacemaker. The SCN resets peripheral clocks through sympathetic nerves or adrenal glucocorticoids (GCs). IOP's circadian rhythm is governed by circadian time signals, sympathetic noradrenaline (NE), and GCs, rather than the local clock. The activity of Na+/K+-ATPase in non-pigmented epithelial cells in the ciliary body can influence the nocturnal increase in IOP by enhancing AH inflow. Conversely, NE, not GCs, can regulate the IOP rhythm by suppressing TM macrophage phagocytosis and AH outflow. The activation of the β1-adrenergic receptor (AR)-mediated EPAC-SHIP1 signal through the ablation of phosphatidylinositol triphosphate may govern phagocytic cup formation. These findings could offer insights for better glaucoma management, such as chronotherapy.
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Affiliation(s)
- Keisuke Ikegami
- Laboratory of Regulation in Metabolism and Behavior, Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-Ku, Fukuoka, 819-0395, Japan.
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Zhang H, Liu Y, Liu J, Chen J, Wang J, Hua H, Jiang Y. cAMP-PKA/EPAC signaling and cancer: the interplay in tumor microenvironment. J Hematol Oncol 2024; 17:5. [PMID: 38233872 PMCID: PMC10792844 DOI: 10.1186/s13045-024-01524-x] [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: 11/16/2023] [Accepted: 01/02/2024] [Indexed: 01/19/2024] Open
Abstract
Cancer is a complex disease resulting from abnormal cell growth that is induced by a number of genetic and environmental factors. The tumor microenvironment (TME), which involves extracellular matrix, cancer-associated fibroblasts (CAF), tumor-infiltrating immune cells and angiogenesis, plays a critical role in tumor progression. Cyclic adenosine monophosphate (cAMP) is a second messenger that has pleiotropic effects on the TME. The downstream effectors of cAMP include cAMP-dependent protein kinase (PKA), exchange protein activated by cAMP (EPAC) and ion channels. While cAMP can activate PKA or EPAC and promote cancer cell growth, it can also inhibit cell proliferation and survival in context- and cancer type-dependent manner. Tumor-associated stromal cells, such as CAF and immune cells, can release cytokines and growth factors that either stimulate or inhibit cAMP production within the TME. Recent studies have shown that targeting cAMP signaling in the TME has therapeutic benefits in cancer. Small-molecule agents that inhibit adenylate cyclase and PKA have been shown to inhibit tumor growth. In addition, cAMP-elevating agents, such as forskolin, can not only induce cancer cell death, but also directly inhibit cell proliferation in some cancer types. In this review, we summarize current understanding of cAMP signaling in cancer biology and immunology and discuss the basis for its context-dependent dual role in oncogenesis. Understanding the precise mechanisms by which cAMP and the TME interact in cancer will be critical for the development of effective therapies. Future studies aimed at investigating the cAMP-cancer axis and its regulation in the TME may provide new insights into the underlying mechanisms of tumorigenesis and lead to the development of novel therapeutic strategies.
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Affiliation(s)
- Hongying Zhang
- Cancer Center, Laboratory of Oncogene, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Yongliang Liu
- Cancer Center, Laboratory of Oncogene, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Jieya Liu
- Cancer Center, Laboratory of Oncogene, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Jinzhu Chen
- Cancer Center, Laboratory of Oncogene, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Jiao Wang
- School of Basic Medicine, Chengdu University of Traditional Chinese Medicine, Chengdu, 610075, China
| | - Hui Hua
- Laboratory of Stem Cell Biology, West China Hospital, Sichuan University, Chengdu, 610041, China.
| | - Yangfu Jiang
- Cancer Center, Laboratory of Oncogene, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China.
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Arkhipov AY, Fedorov NS, Nurullin LF, Khabibrakhmanov AN, Mukhamedyarov MA, Samigullin DV, Malomouzh AI. Activation of TRPV1 Channels Inhibits the Release of Acetylcholine and Improves Muscle Contractility in Mice. Cell Mol Neurobiol 2023; 43:4157-4172. [PMID: 37689594 DOI: 10.1007/s10571-023-01403-y] [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: 05/04/2023] [Accepted: 08/22/2023] [Indexed: 09/11/2023]
Abstract
TRPV1 represents a non-selective transient receptor potential cation channel found not only in sensory neurons, but also in motor nerve endings and in skeletal muscle fibers. However, the role of TRPV1 in the functioning of the neuromuscular junction has not yet been fully established. In this study, the Levator Auris Longus muscle preparations were used to assess the effect of pharmacological activation of TRPV1 channels on neuromuscular transmission. The presence of TRPV1 channels in the nerve terminal and in the muscle fiber was confirmed by immunohistochemistry. It was verified by electrophysiology that the TRPV1 channel agonist capsaicin inhibits the acetylcholine release, and this effect was completely absent after preliminary application of the TRPV1 channel blocker SB 366791. Nerve stimulation revealed an increase of amplitude of isometric tetanic contractions upon application of capsaicin which was also eliminated after preliminary application of SB 366791. Similar data were obtained during direct muscle stimulation. Thus, pharmacological activation of TRPV1 channels affects the functioning of both the pre- and postsynaptic compartment of the neuromuscular junction. A moderate decrease in the amount of acetylcholine released from the motor nerve allows to maintain a reserve pool of the mediator to ensure a longer signal transmission process, and an increase in the force of muscle contraction, in its turn, also implies more effective physiological muscle activity in response to prolonged stimulation. This assumption is supported by the fact that when muscle was indirect stimulated with a fatigue protocol, muscle fatigue was attenuated in the presence of capsaicin.
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Affiliation(s)
- Arsenii Y Arkhipov
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Federal Research Center, Kazan Scientific Center of Russian Academy of Sciences, 2/31 Lobachevsky Street, Box 261, Kazan, Russia, 420111
| | - Nikita S Fedorov
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Federal Research Center, Kazan Scientific Center of Russian Academy of Sciences, 2/31 Lobachevsky Street, Box 261, Kazan, Russia, 420111
- Kazan Federal University, 18 Kremlyovskaya Street, Kazan, Russia, 420008
| | - Leniz F Nurullin
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Federal Research Center, Kazan Scientific Center of Russian Academy of Sciences, 2/31 Lobachevsky Street, Box 261, Kazan, Russia, 420111
- Kazan State Medical University, 49 Butlerova Street, Kazan, Russia, 420012
| | | | | | - Dmitry V Samigullin
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Federal Research Center, Kazan Scientific Center of Russian Academy of Sciences, 2/31 Lobachevsky Street, Box 261, Kazan, Russia, 420111
- A.N. Tupolev Kazan National Research Technical University, 10, K. Marx Street, Kazan, Russia, 420111
| | - Artem I Malomouzh
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Federal Research Center, Kazan Scientific Center of Russian Academy of Sciences, 2/31 Lobachevsky Street, Box 261, Kazan, Russia, 420111.
- A.N. Tupolev Kazan National Research Technical University, 10, K. Marx Street, Kazan, Russia, 420111.
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Dmitrieva SA, Vologin SG, Tsentsevitsky AN, Arkhipov AY, Khuzakhmetova VF, Sibgatullina GV, Bukharaeva EA. Sympathetic Innervation and Endogenous Catecholamines in Neuromuscular Preparations of Muscles with Different Functional Profiles. BIOCHEMISTRY (MOSCOW) 2023; 88:364-373. [PMID: 37076283 DOI: 10.1134/s0006297923030069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/28/2023]
Abstract
Influence of the sympathetic nervous system on the work of skeletal muscles contractile apparatus is now beyond doubt. However, until recently there was no evidence that the endings of sympathetic nerves can be located in close proximity to the neuromuscular synapses, and there is also no reliable data on how much endogenous adrenaline and noradrenaline can be contained near the synaptic contact in skeletal muscles. In this research, using fluorescent analysis, immunohistochemical and enzyme immunoassays the isolated neuromuscular preparations of three skeletal muscles of different functional profiles and containing different types of muscle fibers were examined. Close contact between the sympathetic and motor cholinergic nerve endings and the presence of tyrosine hydroxylase in this area were demonstrated. Concentrations of endogenous adrenaline and noradrenaline in the solution perfusing the neuromuscular preparation were determined under different modes of its functioning. The effects of α and β adrenoreceptor blockers on the processes of acetylcholine quantal secretion from the motor nerve endings were compared. The data obtained provide evidence for the presence of endogenous catecholamines in the neuromuscular junction region and their role in modulation of the synaptic function.
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Affiliation(s)
- Svetlana A Dmitrieva
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Kazan, 420111, Russia
| | - Semyon G Vologin
- Tatar Research Institute of Agriculture, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Kazan, 420059, Russia
| | - Andrei N Tsentsevitsky
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Kazan, 420111, Russia
| | - Arsenii Yu Arkhipov
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Kazan, 420111, Russia
| | - Venera F Khuzakhmetova
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Kazan, 420111, Russia
| | - Guzel V Sibgatullina
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Kazan, 420111, Russia
| | - Ellya A Bukharaeva
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences", Kazan, 420111, Russia.
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