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Manhas N. Computational Model of Complex Calcium Dynamics: Store Operated Ca 2+ Channels and Mitochondrial Associated Membranes in Pancreatic Acinar Cells. Cell Biochem Biophys 2024:10.1007/s12013-024-01484-6. [PMID: 39266873 DOI: 10.1007/s12013-024-01484-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2024] [Indexed: 09/14/2024]
Abstract
This proposed model explores the intricate Ca2+ dynamics within the pancreatic acinar cells (PACs) by emphasizing the role of store-operated Ca2+ entry (SOCE) and the mitochondrial-associated membranes (MAMs) in the secretory region (apical) of the PACs. Traditionally, Ca2+ releases from the endoplasmic reticulum (ER) via calcium-induced calcium release (CICR). It has been shown to be important in regulating functions such as secretion of digestive enzymes in PACs. However, this model posits that upon the depletion of Ca2+ in the ER, the signaling protein stromal interaction molecule (STIM1) is activated. Activated STIM1, then facilitates the opening of Orai channels, allowing Ca2+ influx through the store-operated calcium channels (SOCCs). The model highlights the complexity of the Ca2+ dynamics, and the importance of SOCE and MAMs in the PACs Ca2+ homeostasis. The numerical and bifurcation analysis illustrate how changes in agonist concentrations can lead to the diverse Ca2+ oscillation patterns, such as thin to broader oscillations, sinusoidal patterns, and baseline fluctuations, driven by the feedback mechanisms involving Ca2+ and inositol 1,4,5 trisphosphate (IP3). This understanding could have broader implications for cellular physiology and the development of therapies targeting Ca2+ signaling pathways.
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Affiliation(s)
- Neeraj Manhas
- Department of Mathematics, National Institute of Technology, Raipur, Chhattisgarh, 492010, India.
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2
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Pandol SJ, Gottlieb RA. Calcium, mitochondria and the initiation of acute pancreatitis. Pancreatology 2022; 22:838-845. [PMID: 35941013 DOI: 10.1016/j.pan.2022.07.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 07/16/2022] [Accepted: 07/19/2022] [Indexed: 12/11/2022]
Abstract
Acute pancreatitis is characterized by necrosis of its parenchymal cells and influx and activation of inflammatory cells that further promote injury and necrosis. This review is intended to discuss the central role of disorders of calcium metabolism and mitochondrial dysfunction in the mechanism of pancreatitis development. The disorders are placed in context of calcium and mitochondria in physiologic function of the pancreas. Moreover, we discuss potential therapeutics for preventing pathologic calcium signals that injure mitochondria and interventions that promote the removal of injured mitochondria and regenerate new and heathy populations of mitochondria.
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Affiliation(s)
- Stephen J Pandol
- Division of Digestive and Liver Diseases, Cedars-Sinai Medical Center, Los Angeles, CA, 90048, USA.
| | - Roberta A Gottlieb
- Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA, 90048, USA
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Pidsaya A, Kamnate A, Sirisin J, Watanabe M, Kondo H, Hipkaeo W. Different expression and subcellular localization of vesicular inhibitory amino acid transporter in ducts of major salivary glands: An in situ study in mice. Arch Oral Biol 2020; 113:104689. [PMID: 32135333 DOI: 10.1016/j.archoralbio.2020.104689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 02/25/2020] [Accepted: 02/26/2020] [Indexed: 10/24/2022]
Abstract
OBJECTIVE The aim of this study was to clarify the mechanism of GABA (□-amino butyric acid)-signaling in the salivary glands by localization of vesicular inhibitory amino acid transporter, a key molecule in GABA-synthesis. DESIGN Parotid, sublingual and submandibular glands of mice at various postnatal stages were examined in immuno-light and electron microscopy as well as immuno-blotting. RESULTS Expression for vesicular inhibitory amino acid transporter was detected in parotid and sublingual glands of both sexes and female submandibular gland throughout postnatal development, while it was negligible in male submandibular glands at and after puberty. The expression in female submandibular glands attenuated after testosterone injection. The immunoreactivity was localized in striated ductal cells, but not acinar cells, in the salivary glands, and it occurred in association with intracellular and plasma membranes of the cells. It also occurred in myoepithelial and vascular smooth muscle cells. CONCLUSIONS GABA-signaling was suggested to be a significant signaling pathway in salivary ductal cells, which was suppressed in male submandibular glands at and after puberty. The suppression in the submandibular duct was by testosterone. In addition, the participation of vesicular inhibitory amino acid transporter in GABA signaling through plasma membranes of the ductal cells was suggested. The significance of occurrence of the immunoreactivity in myoepithelial and smooth muscle cells remains to be further elucidated in terms of implication in GABA signaling.
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Affiliation(s)
- Atthapon Pidsaya
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Anussara Kamnate
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Juthathip Sirisin
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Masahiko Watanabe
- Department of Anatomy, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Hisatake Kondo
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand; Department of Anatomy, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Wiphawi Hipkaeo
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand.
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Waldron RT, Chen Y, Pham H, Go A, Su HY, Hu C, Wen L, Husain SZ, Sugar CA, Roos J, Ramos S, Lugea A, Dunn M, Stauderman K, Pandol SJ. The Orai Ca 2+ channel inhibitor CM4620 targets both parenchymal and immune cells to reduce inflammation in experimental acute pancreatitis. J Physiol 2019; 597:3085-3105. [PMID: 31050811 PMCID: PMC6582954 DOI: 10.1113/jp277856] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 05/02/2019] [Indexed: 02/05/2023] Open
Abstract
KEY POINTS This work confirms previous reports that CM4620, a small molecule inhibitor of Ca2+ entry via store operated Ca2+ entry (SOCE) channels formed by stromal interaction molecule 1 (STIM1)/Orai complexes, attenuates acinar cell pathology and acute pancreatitis in mouse experimental models. Here we report that intravenous administration of CM4620 reduces the severity of acute pancreatitis in the rat, a hitherto untested species. Using CM4620, we probe further the mechanisms whereby SOCE via STIM1/Orai complexes contributes to the disease in pancreatic acinar cells, supporting a role for endoplasmic reticulum stress/cell death pathways in these cells. Using CM4620, we show that SOCE via STIM1/Orai complexes promotes neutrophil oxidative burst and inflammatory gene expression during acute pancreatitis, including in immune cells which may be either circulating or invading the pancreas. Using CM4620, we show that SOCE via STIM1/Orai complexes promotes activation and fibroinflammatory gene expression within pancreatic stellate cells. ABSTRACT Key features of acute pancreatitis include excess cellular Ca2+ entry driven by Ca2+ depletion from the endoplasmic reticulum (ER) and subsequent activation of store-operated Ca2+ entry (SOCE) channels in the plasma membrane. In several cell types, including pancreatic acinar, stellate cells (PaSCs) and immune cells, SOCE is mediated via channels composed primarily of Orai1 and stromal interaction molecule 1 (STIM1). CM4620, a selective Orai1 inhibitor, prevents Ca2+ entry in acinar cells. This study investigates the effects of CM4620 in preventing or reducing acute pancreatitis features and severity. We tested the effects of CM4620 on SOCE, trypsinogen activation, acinar cell death, activation of NFAT and NF-κB, and inflammatory responses in ex vivo and in vivo rodent models of acute pancreatitis and human pancreatic acini. We also examined whether CM4620 inhibited cytokine release in immune cells, fibro-inflammatory responses in PaSCs, and oxidative burst in neutrophils, all cell types participating in pancreatitis. CM4620 administration to rats by i.v. infusion starting 30 min after induction of pancreatitis significantly diminished pancreatitis features including pancreatic oedema, acinar cell vacuolization, intrapancreatic trypsin activity, cell death signalling and acinar cell death. CM4620 also decreased myeloperoxidase activity and inflammatory cytokine expression in pancreas and lung tissues, fMLF peptide-induced oxidative burst in human neutrophils, and cytokine production in human peripheral blood mononuclear cells (PBMCs) and rodent PaSCs, indicating that Orai1/STIM1 channels participate in the inflammatory responses of these cell types during acute pancreatitis. These findings support pathological Ca2+ entry-mediated cell death and proinflammatory signalling as central mechanisms in acute pancreatitis pathobiology.
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Affiliation(s)
- Richard T. Waldron
- Cedars-Sinai Medical Center, University of California, Los Angeles, CA
- Veterans Affairs Greater Los Angeles Healthcare System,University of California, Los Angeles, CA
- University of California, Los Angeles, CA
| | - Yafeng Chen
- Cedars-Sinai Medical Center, University of California, Los Angeles, CA
- Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Hung Pham
- Cedars-Sinai Medical Center, University of California, Los Angeles, CA
| | - Ariel Go
- Cedars-Sinai Medical Center, University of California, Los Angeles, CA
| | - Hsin-Yuan Su
- Cedars-Sinai Medical Center, University of California, Los Angeles, CA
| | - Cheng Hu
- Cedars-Sinai Medical Center, University of California, Los Angeles, CA
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital/West China Medical School, Sichuan, China
| | - Li Wen
- University of Pittsburgh
- the Children’s Hospital of Pittsburgh of UMPC, Pittsburgh, Pennsylvania
| | - Sohail Z. Husain
- University of Pittsburgh
- the Children’s Hospital of Pittsburgh of UMPC, Pittsburgh, Pennsylvania
| | | | | | | | - Aurelia Lugea
- Cedars-Sinai Medical Center, University of California, Los Angeles, CA
- Veterans Affairs Greater Los Angeles Healthcare System,University of California, Los Angeles, CA
- University of California, Los Angeles, CA
| | | | | | - Stephen J. Pandol
- Cedars-Sinai Medical Center, University of California, Los Angeles, CA
- Veterans Affairs Greater Los Angeles Healthcare System,University of California, Los Angeles, CA
- University of California, Los Angeles, CA
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Sakaew W, Tachow A, Thoungseabyoun W, Khrongyut S, Rawangwong A, Polsan Y, Masahiko W, Kondo H, Hipkaeo W. Expression and localization of VIAAT in distal uriniferous tubular epithelium of mouse. Ann Anat 2018; 222:21-27. [PMID: 30448467 DOI: 10.1016/j.aanat.2018.11.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Revised: 10/28/2018] [Accepted: 11/01/2018] [Indexed: 10/27/2022]
Abstract
Vesicular inhibitory amino acid transporter (VIAAT) is a transmembrane transporter which is responsible for the storage of gamma-aminobutyric acid (GABA) or glycine in synaptic vesicles. According to recent studies, GABA is known to be expressed in the kidney. For clear understanding of the intra-renal GABA signaling, the localization of VIAAT was examined in the present study. Intense immunoreactivity was found largely confined to the distal tubule epithelia, especially distinct in the inner medulla, although the immunoreactivity was discerned more or less in all tubules and glomeruli. No distinct immunoreactivity was seen in capillary endothelia or interstitial fibroblasts. In immuno-DAB and immuno-gold electron microscopy, the immunoreaction was found at the basal infoldings of plasma membranes and basal portions of the lateral plasma membranes, but not in any vesicles or vacuoles within the distal tubular cells. The significance of the enigmatic finding, localization of a vesicular molecule on selected portions of the plasma membrane of distal tubular cells, was discussed in view of the possibility of paracrine or autocrine effects of GABA on some other uriniferous tubular cells or interstitial cells.
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Affiliation(s)
- Waraporn Sakaew
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Apussara Tachow
- Mahidol University, Nakhonsawan Campus, Nakhonsawan 60130, Thailand
| | - Wipawee Thoungseabyoun
- Faculty of Medicine, Siam University, 38 Phet Kasem Road, Bang Wa, Phasi Charoen, Bangkok 10160 Thailand
| | - Suthankamon Khrongyut
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Atsara Rawangwong
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Yada Polsan
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
| | - Watanabe Masahiko
- Department of Anatomy, Graduate School of Medicine, Hokkaido University, Sapporo, Japan
| | - Hisatake Kondo
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand; Department of Anatomy, Graduate School of Medicine, Tohoku University, Sendai, Japan
| | - Wiphawi Hipkaeo
- Electron Microscopy Unit, Department of Anatomy, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand.
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Wen J, Huang YC, Xiu HH, Shan ZM, Xu KQ. Altered expression of stromal interaction molecule (STIM)-calcium release-activated calcium channel protein (ORAI) and inositol 1,4,5-trisphosphate receptors (IP3Rs) in cancer: will they become a new battlefield for oncotherapy? CHINESE JOURNAL OF CANCER 2016; 35:32. [PMID: 27013185 PMCID: PMC4807559 DOI: 10.1186/s40880-016-0094-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 03/03/2016] [Indexed: 12/20/2022]
Abstract
The stromal interaction molecule (STIM)-calcium release-activated calcium channel protein (ORAI) and inositol 1,4,5-trisphosphate receptors (IP3Rs) play pivotal roles in the modulation of Ca2+-regulated pathways from gene transcription to cell apoptosis by driving calcium-dependent signaling processes. Increasing evidence has implicated the dysregulation of STIM–ORAI and IP3Rs in tumorigenesis and tumor progression. By controlling the activities, structure, and/or expression levels of these Ca2+-transporting proteins, malignant cancer cells can hijack them to drive essential biological functions for tumor development. However, the molecular mechanisms underlying the participation of STIM–ORAI and IP3Rs in the biological behavior of cancer remain elusive. In this review, we summarize recent advances regarding STIM–ORAI and IP3Rs and discuss how they promote cell proliferation, apoptosis evasion, and cell migration through temporal and spatial rearrangements in certain types of malignant cells. An understanding of the essential roles of STIM–ORAI and IP3Rs may provide new pharmacologic targets that achieve a better therapeutic effect by inhibiting their actions in key intracellular signaling pathways.
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Affiliation(s)
- Jing Wen
- Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, 510080, P. R. China
| | - Ying-Cheng Huang
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, 510080, P. R. China
| | - Huan-Huan Xiu
- Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, 510080, P. R. China
| | - Zhi-Ming Shan
- Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, 510080, P. R. China
| | - Kang-Qing Xu
- Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, 510080, P. R. China.
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