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Eum JH, Park M, Yoon JA, Yoon SY. Voltage Dependent N Type Calcium Channel in Mouse Egg Fertilization. Dev Reprod 2021; 24:297-306. [PMID: 33537516 PMCID: PMC7837419 DOI: 10.12717/dr.2020.24.4.297] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 12/02/2020] [Accepted: 12/10/2020] [Indexed: 02/07/2023]
Abstract
Repetitive changes in the intracellular calcium concentration
([Ca2+]i) triggers egg activation, including cortical
granule exocytosis, resumption of second meiosis, block to polyspermy, and
initiating embryonic development. [Ca2+]i oscillations that
continue for several hours, are required for the early events of egg activation
and possibly connected to further development to the blastocyst stage. The
sources of Ca2+ ion elevation during [Ca2+]i
oscillations are Ca2+ release from endoplasmic reticulum
through inositol 1,4,5 tri-phosphate receptor and Ca2+ ion
influx through Ca2+ channel on the plasma membrane.
Ca2+ channels have been characterized into
voltage-dependent Ca2+ channels (VDCCs), ligand-gated
Ca2+ channel, and leak-channel. VDCCs expressed on muscle
cell or neuron is specified into L, T, N, P, Q, and R type VDCs by their
activation threshold or their sensitivity to peptide toxins isolated from cone
snails and spiders. The present study was aimed to investigate the localization
pattern of N and P/Q type voltage-dependent calcium channels in mouse eggs and
the role in fertilization. [Ca2+]i oscillation was observed in
a Ca2+ contained medium with sperm factor or adenophostin A
injection but disappeared in Ca2+ free medium.
Ca2+ influx was decreased by Lat A. N-VDCC specific
inhibitor, ω-Conotoxin CVIIA induced abnormal [Ca2+]i
oscillation profiles in SrCl2 treatment. N or P/Q type VDC were
distributed on the plasma membrane in cortical cluster form, not in the
cytoplasm. Ca2+ influx is essential for
[Ca2+]i oscillation during mammalian fertilization. This
Ca2+ influx might be controlled through the N or P/Q type
VDCCs. Abnormal VDCCs expression of eggs could be tested in fertilization
failure or low fertilization eggs in subfertility women.
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Affiliation(s)
- Jin Hee Eum
- Fertility Center of CHA Gangnam Medical Center, Seoul 06125, Korea
| | - Miseon Park
- Fertility Center of CHA Gangnam Medical Center, Seoul 06125, Korea
| | - Jung Ah Yoon
- Fertility Center of CHA Gangnam Medical Center, Seoul 06125, Korea
| | - Sook Young Yoon
- Fertility Center of CHA Gangnam Medical Center, Seoul 06125, Korea
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Liu F, Zhou R, Yan H, Yin H, Wu X, Tan Y, Li L. Metabotropic glutamate receptor 5 modulates calcium oscillation and innate immune response induced by lipopolysaccharide in microglial cell. Neuroscience 2014; 281:24-34. [PMID: 25250840 DOI: 10.1016/j.neuroscience.2014.09.034] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 09/13/2014] [Accepted: 09/15/2014] [Indexed: 01/01/2023]
Abstract
Microglia, the primary immune cells in the brain, have been implicated as the predominant cells governing inflammation-mediated neuronal damage. In response to immunological challenges such as lipopolysaccharide (LPS), microglia are activated and subsequently inflammatory process is initiated as evidenced by the release of pro-inflammatory chemokines and cytokines. Here we show that Group I metabotropic glutamate receptor 5 (mGluR5) is involved in LPS-induced microglia activation. LPS triggered a similar pattern of [Ca2+]i oscillation in N9, Toll-like receptor 4 (TLR4)-mutant EOC 20, TLR4-wild-type and TLR4-deficient primary mouse microglia, suggesting that LPS-induced [Ca2+]i oscillation is independent of TLR4. The characteristics of [Ca2+]i oscillation induced by LPS are consistent with those observed in mGluR5 activation. In addition, mGluR5 antagonist 3-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (MTEP) abolished LPS-induced [Ca2+]i oscillation. Immunocytochemistry demonstrated that LPS colocalizes with mGluR5 in microglia and the direct binding of LPS and mGluR5 was further validated by antibody-based fluorescence resonance energy transfer (FRET) technology. Activation of mGluR5 using a selective agonist (RS)-2-chloro-5-hydroxyphenylglycine (CHPG) significantly expanded LPS-induced nuclear factor-kappa B (NF-κB) activity and CHPG alone increased NF-κB activity as well. But, mGluR5 antagonist MTEP attenuated the actions of LPS, CHPG and the additive effect of LPS and CHPG in microglia. LPS induced tumor necrosis factor-α (TNF-α) secretion in N9 microglia, but not in TLR4-mutant EOC 20 and TLR4-deficient primary mouse microglia. CHPG reduced LPS-caused TNF-α production, but MTEP increased LPS-induced TNF-α production and blocked the effect of CHPG in N9 microglia. These data demonstrate that mGluR5 and TLR4 are two critical receptors that mediate microglia activation in response to LPS, suggesting that mGluR5 may represent a novel target for modulating microglia-dependent neuroinflammation.
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Affiliation(s)
- F Liu
- State Key Laboratory of Trauma, Burn and Combined Injury, Chongqing, China; Department of Infection & Immunity, Research Institute of Surgery/Daping Hospital, Third Military Medical University, Chongqing, China
| | - R Zhou
- Department of Operating Room, Children's Hospital, Chongqing Medical University, Chongqing, China; Ministry of Education Key Laboratory of Child Development and Disorders, Children's Hospital, Chongqing Medical University, Chongqing, China
| | - H Yan
- Department of Anesthesiology, Research Institute of Surgery/Daping Hospital, Third Military Medical University, Chongqing, China
| | - H Yin
- Department of Emergency Nursing, School of Nursing, Third Military Medical University, Chongqing, China
| | - X Wu
- Department of Infection & Immunity, Research Institute of Surgery/Daping Hospital, Third Military Medical University, Chongqing, China
| | - Y Tan
- Department of Infection & Immunity, Research Institute of Surgery/Daping Hospital, Third Military Medical University, Chongqing, China
| | - L Li
- State Key Laboratory of Trauma, Burn and Combined Injury, Chongqing, China; Department of Infection & Immunity, Research Institute of Surgery/Daping Hospital, Third Military Medical University, Chongqing, China.
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Hwang JK, Erkhembaatar M, Gu DR, Lee SH, Lee CH, Shin DM, Lee YR, Kim MS. Glechoma hederacea Suppresses RANKL-mediated Osteoclastogenesis. J Dent Res 2014; 93:685-90. [PMID: 24850617 DOI: 10.1177/0022034514536579] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 04/23/2014] [Indexed: 11/17/2022] Open
Abstract
Glechoma hederacea (GH), commonly known as ground-ivy or gill-over-the-ground, has been extensively used in folk remedies for relieving symptoms of inflammatory disorders. However, the molecular mechanisms underlying the therapeutic action of GH are poorly understood. Here, we demonstrate that GH constituents inhibit osteoclastogenesis by abrogating receptor activator of nuclear κ-B ligand (RANKL)-induced free cytosolic Ca(2+) ([Ca(2+)]i) oscillations. To evaluate the effect of GH on osteoclastogenesis, we assessed the formation of multi-nucleated cells (MNCs), enzymatic activity of tartrate-resistant acidic phosphatase (TRAP), expression of nuclear factor of activated T-cells cytoplasmic 1 (NFATc1), and [Ca(2+)]i alterations in response to treatment with GH ethanol extract (GHE) in primarily cultured bone marrow-derived macrophages (BMMs). Treatment of RANKL-stimulated or non-stimulated BMMs with GHE markedly suppressed MNC formation, TRAP activity, and NFATc1 expression in a dose-dependent manner. Additionally, GHE treatment induced a large transient elevation in [Ca(2+)]i while suppressing RANKL-induced [Ca(2+)]i oscillations, which are essential for NFATc1 activation. GHE-evoked increase in [Ca(2+)]i was dependent on extracellular Ca(2+) and was inhibited by 1,4-dihydropyridine (DHP), inhibitor of voltage-gated Ca(2+) channels (VGCCs), but was independent of store-operated Ca(2+) channels. Notably, after transient [Ca(2+)] elevation, treatment with GHE desensitized the VGCCs, resulting in an abrogation of RANKL-induced [Ca(2+)]i oscillations and MNC formation. These findings demonstrate that treatment of BMMs with GHE suppresses RANKL-mediated osteoclastogenesis by activating and then desensitizing DHP-sensitive VGCCs, suggesting potential applications of GH in the treatment of bone disorders, such as periodontitis, osteoporosis, and rheumatoid arthritis.
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Affiliation(s)
- J K Hwang
- Center for Metabolic Function Regulation (CMFR), Wonkwang University School of Medicine, Iksan 570-749, Republic of Korea Department of Oral Biochemistry, College of Dentistry, Wonkwang University, 344-2 Shinyong-dong, Iksan 570-749, Republic of Korea
| | - M Erkhembaatar
- Department of Oral Physiology, College of Dentistry, Wonkwang University, Iksan 570-749, Republic of Korea
| | - D R Gu
- Center for Metabolic Function Regulation (CMFR), Wonkwang University School of Medicine, Iksan 570-749, Republic of Korea Department of Oral Microbiology and Immunology, College of Dentistry, Wonkwang University, Iksan 570-749, Republic of Korea
| | - S H Lee
- Center for Metabolic Function Regulation (CMFR), Wonkwang University School of Medicine, Iksan 570-749, Republic of Korea Department of Oral Microbiology and Immunology, College of Dentistry, Wonkwang University, Iksan 570-749, Republic of Korea
| | - C H Lee
- Microelectronics and Display, Next Generation Industrial Radiation Technology RIC, Wonkwang University, Iksan 570-749, Republic of Korea
| | - D M Shin
- Department of Oral Biology, BK21 PLUS Project, Yonsei University College of Dentistry, Seoul 120-752
| | - Y R Lee
- Center for Metabolic Function Regulation (CMFR), Wonkwang University School of Medicine, Iksan 570-749, Republic of Korea Department of Oral Biochemistry, College of Dentistry, Wonkwang University, 344-2 Shinyong-dong, Iksan 570-749, Republic of Korea
| | - M S Kim
- Department of Oral Physiology, College of Dentistry, Wonkwang University, Iksan 570-749, Republic of Korea Microelectronics and Display, Next Generation Industrial Radiation Technology RIC, Wonkwang University, Iksan 570-749, Republic of Korea
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