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Fukui M, Tsutsumi T, Yamamoto-Mikami A, Morito K, NaokoTakahashi, Tanaka T, Iwasa T, Kuwahara A, Irahara M, Tokumura A. Distinct contributions of two choline-producing enzymatic activities to lysophosphatidic acid production in human amniotic fluid from pregnant women in the second trimester and after parturition. Prostaglandins Other Lipid Mediat 2020; 150:106471. [PMID: 32585250 DOI: 10.1016/j.prostaglandins.2020.106471] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 05/22/2020] [Accepted: 06/11/2020] [Indexed: 11/30/2022]
Abstract
The purpose of this study was to clarify whether human amniotic fluid (AF) contains a significant level of bioactive lysophosphatidic acid (LPA) and, whether autotaxin (ATX) is involved in the production of LPA, if present. Using LC-MS/MS, we found a higher ratio of levels of LPA and its precursor lysophosphatidylcholine (LPC) in AF collected after parturition than that in AF collected at the middle stage of pregnancy. We detected significant choline-producing enzymatic activity toward an exogenous LPC in AF at the middle stage of pregnancy, about half of which was ascribable to ATX. In AF collected after parturition, the ATX-independent choline-producing activity of glycerophosphcholine phosphodiesterase coupled to lysophospholipase A activity was increased in relative to the lysophospholipase D activity of ATX. These results suggest that the increased LPA/LPC ratio in AF at the term of pregnancy was due to not only a moderate increase in the level of LPC, but also an unknown mechanism involving epithelial cells bathed with AF.
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Affiliation(s)
- Midori Fukui
- Department of Pharmaceutical Health Chemistry, Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Toshihiko Tsutsumi
- Faculty of Pharmaceutical Sciences, Kyushu University of Health and Welfare, Nobeoka, 882-8508, Japan
| | - Aimi Yamamoto-Mikami
- Department of Pharmaceutical Health Chemistry, Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Katsuya Morito
- Department of Pharmaceutical Health Chemistry, Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - NaokoTakahashi
- Department of Pharmaceutical Health Chemistry, Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8505, Japan
| | - Tamotsu Tanaka
- Department of Pharmaceutical Health Chemistry, Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8505, Japan; Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8513, Japan
| | - Takeshi Iwasa
- Department of Obstetrics and Gynecology, Institute of Health Biosciences, University of Tokushima School of Medicine, Tokushima 770-8503, Japan
| | - Akira Kuwahara
- Department of Obstetrics and Gynecology, Institute of Health Biosciences, University of Tokushima School of Medicine, Tokushima 770-8503, Japan
| | - Minoru Irahara
- Department of Obstetrics and Gynecology, Institute of Health Biosciences, University of Tokushima School of Medicine, Tokushima 770-8503, Japan
| | - Akira Tokumura
- Department of Pharmaceutical Health Chemistry, Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8505, Japan; Faculty of Pharmacy, Yasuda Women's University, Hiroshima 731-0153, Japan.
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Mohammadi Z, Hayati Roodbari N, Parivar K, Salehnia M. Supplementation of Culture Media with Lysophosphatidic Acid Improves The Follicular Development of Human Ovarian Tissue after Xenotransplantaion into The Back Muscle of γ-Irradiated Mice. CELL JOURNAL 2019; 22:358-366. [PMID: 31863662 PMCID: PMC6947004 DOI: 10.22074/cellj.2020.6752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Accepted: 04/23/2019] [Indexed: 01/26/2023]
Abstract
Objective The aim of the present study was to evaluate the effects of lysophosphatidic acid (LPA) supplementation
of human ovarian tissue culture media on tissue survival, follicular development and expression of apoptotic genes
following xenotransplantation.
Materials and Methods In this experimental study, human ovarian tissue was collected from eight normal female
to male transsexual individuals and cut into small fragments. These fragments were vitrified-warmed and cultured
for 24 hours in the presence or absence of LPA, then xenografted into back muscles of γ-irradiated mice. Two weeks
post-transplantation the morphology of the recovered tissues were evaluated by hematoxylin and eosin staining. The
expression of genes related to apoptosis (BAX and BCL2) were analyzed by real time revers transcription polymerase
chain reaction (RT-PCR) and detection of BAX protein was done by immunohistochemical staining.
Results The percent of normal and growing follicles were significantly increased in both grafted groups in comparison to
the non-grafted groups, however, these rates were higher in the LPA-treated group than the non-treated group (P<0.05).
There was a higher expression of the anti-apoptotic gene, BCL2, but a lower expression of the pro-apoptotic gene, BAX,
and a significant lower BAX/ BCL2 ratio in the LPA-treated group in comparison with non-treated control group (P<0.05).
No immunostaining positive cells for BAX were observed in the follicles and oocytes in both transplanted ovarian groups.
Conclusion Supplementation of human ovarian tissue culture medium with LPA improves follicular survival and
development by promoting an anti-apoptotic balance in transcription of BCL2 and BAX genes.
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Affiliation(s)
- Zeynab Mohammadi
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Nasim Hayati Roodbari
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Kazem Parivar
- Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Mojdeh Salehnia
- Department of Anatomy, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran. Electronic Address:
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Borghesi J, Mario LC, Carreira ACO, Miglino MA, Favaron PO. Phenotype and multipotency of rabbit (Oryctolagus cuniculus) amniotic stem cells. Stem Cell Res Ther 2017; 8:27. [PMID: 28173846 PMCID: PMC5297200 DOI: 10.1186/s13287-016-0468-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 12/21/2016] [Accepted: 12/31/2016] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Stem cells are capable of unlimited self-renewal and are able to remain undifferentiated for extended periods of time prior to their differentiation into specific cell lineages. Because of the issues (ethical and religious) involved in the use of embryonic stem cells and the limited plasticity of adult stem cells, an alternative cell source could be foetal stem cells derived from extra-embryonic tissue, which are highly proliferative, grow in vitro and possess interesting immunogenic characteristics. As a result, the amniotic membrane of several species has been studied as an important new source of stem cells. METHODS Here, we cultured and characterized mesenchymal progenitor cells derived from the rabbit amniotic membrane, and investigated their differentiation potential. In total, amniotic membranes were collected from eight rabbit foetuses and were isolated by the explant technique. The obtained cells were cultured in DMEM-HIGH glucose and incubated at 37 °C in a humidified atmosphere with 5% CO2. RESULTS The cells adhered to the culture plates and showed a high proliferative capacity with fibroblast-like morphologies. The cells showed a positive response for markers for the cytoskeleton, mesenchymal stem cells and proliferation, pluripotency and haematopoietic precursor stem cells. However, the cells were negative for CD45, a marker of haematopoietic cells. Furthermore, the cells had the capacity to be induced to differentiate into osteogenic, adipogenic and chondrogenic lineages. In addition, when the cells were injected into nude mice, we did not observe the formation of tumours. CONCLUSIONS In summary, our results demonstrate that multipotent mesenchymal stem cells can be obtained from the rabbit amniotic membrane for possible use in future cell therapy applications.
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Affiliation(s)
- Jéssica Borghesi
- Department of Surgery, School of Veterinary Medicine and Animal Science, University of Sao Paulo, Sao Paulo, SP Brazil
- Orlando Marques de Paiva, 87, Cidade Universitária, Sao Paulo, SP 05508-270 Brazil
| | - Lara Carolina Mario
- Department of Surgery, School of Veterinary Medicine and Animal Science, University of Sao Paulo, Sao Paulo, SP Brazil
| | - Ana Claudia Oliveira Carreira
- NUCEL (Cell and Molecular Therapy Center) and NETCEM (Center for Studies in Cell and Molecular Therapy), School of Medicine—Chemistry Institute, Biochemistry Department, Sao Paulo University, Sao Paulo, SP Brazil
| | - Maria Angélica Miglino
- Department of Surgery, School of Veterinary Medicine and Animal Science, University of Sao Paulo, Sao Paulo, SP Brazil
| | - Phelipe Oliveira Favaron
- Department of Surgery, School of Veterinary Medicine and Animal Science, University of Sao Paulo, Sao Paulo, SP Brazil
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Lysophosphatidic acid (LPA) signaling in human and ruminant reproductive tract. Mediators Inflamm 2014; 2014:649702. [PMID: 24744506 PMCID: PMC3973013 DOI: 10.1155/2014/649702] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Accepted: 01/24/2014] [Indexed: 01/28/2023] Open
Abstract
Lysophosphatidic acid (LPA) through activating its G protein-coupled receptors (LPAR 1–6) exerts diverse cellular effects that in turn influence several physiological processes including reproductive function of the female. Studies in various species of animals and also in humans have identified important roles for the receptor-mediated LPA signaling in multiple aspects of human and animal reproductive tract function. These aspects range from ovarian and uterine function, estrous cycle regulation, early embryo development, embryo implantation, decidualization to pregnancy maintenance and parturition. LPA signaling can also have pathological consequences, influencing aspects of endometriosis and reproductive tissue associated tumors. The review describes recent progress in LPA signaling research relevant to human and ruminant reproduction, pointing at the cow as a relevant model to study LPA influence on the human reproductive performance.
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Mazaki-Tovi S, Romero R, Kusanovic JP, Erez O, Gotsch F, Mittal P, Than NG, Nhan-Chang CL, Hamill N, Vaisbuch E, Chaiworapongsa T, Edwin SS, Nien JK, Gomez R, Espinoza J, Kendal-Wright C, Hassan SS, Bryant-Greenwood G. Visfatin/Pre-B cell colony-enhancing factor in amniotic fluid in normal pregnancy, spontaneous labor at term, preterm labor and prelabor rupture of membranes: an association with subclinical intrauterine infection in preterm parturition. J Perinat Med 2008; 36:485-96. [PMID: 18598235 PMCID: PMC2581638 DOI: 10.1515/jpm.2008.084] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Visfatin, a novel adipokine originally discovered as a pre-B-cell colony enhancing factor, is expressed by amniotic epithelium, cytotrophoblast, and decidua and is over-expressed when fetal membranes are exposed to mechanical stress and/or pro-inflammatory stimuli. Visfatin expression by fetal membranes is dramatically up-regulated after normal spontaneous labor. The aims of this study were to determine if visfatin is detectable in amniotic fluid (AF) and whether its concentration changes with gestational age, spontaneous labor, preterm prelabor rupture of membranes (preterm PROM) and in the presence of microbial invasion of the amniotic cavity (MIAC). METHODS In this cross-sectional study, visfatin concentration in AF was determined in patients in the following groups: 1) mid-trimester (n=75); 2) term not in labor (n=27); 3) term in spontaneous labor (n=51); 4) patients with preterm labor with intact membranes (PTL) without MIAC who delivered at term (n=35); 5) patients with PTL without MIAC who delivered preterm (n=52); 6) patients with PTL with MIAC (n=25); 7) women with preterm PROM without MIAC (n=26); and 8) women with preterm PROM with MIAC (n=26). Non-parametric statistics were used for analysis. RESULTS 1) The median AF concentration of visfatin was significantly higher in patients at term than in mid-trimester; 2) Among women with PTL who delivered preterm, the median visfatin concentration was significantly higher in patients with MIAC than those without MIAC; 3) Similarly, patients with PTL and MIAC had a higher median AF visfatin concentration than those with PTL who delivered at term; 4) Among women with preterm PROM, the median AF visfatin concentration was significantly higher in patients with MIAC than those without MIAC. CONCLUSIONS 1) Visfatin is a physiologic constituent of AF; 2) The concentration of AF visfatin increases with advancing gestational age; 3) AF visfatin concentration is elevated in patients with MIAC, regardless of the membrane status, suggesting that visfatin participates in the host response against infection.
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Affiliation(s)
- Shali Mazaki-Tovi
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI.,Department of Obstetrics and Gynecology, Wayne State University/Hutzel Women's Hospital, Detroit, MI
| | - Roberto Romero
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI.,Center for Molecular Medicine and Genetics, Wayne State University, Detroit, MI
| | - Juan Pedro Kusanovic
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI.,Department of Obstetrics and Gynecology, Wayne State University/Hutzel Women's Hospital, Detroit, MI
| | - Offer Erez
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI.,Department of Obstetrics and Gynecology, Wayne State University/Hutzel Women's Hospital, Detroit, MI
| | - Francesca Gotsch
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI
| | - Pooja Mittal
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI.,Department of Obstetrics and Gynecology, Wayne State University/Hutzel Women's Hospital, Detroit, MI
| | - Nandor Gabor Than
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI
| | - Chia-lang Nhan-Chang
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI.,Department of Obstetrics and Gynecology, Wayne State University/Hutzel Women's Hospital, Detroit, MI
| | - Neil Hamill
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI.,Department of Obstetrics and Gynecology, Wayne State University/Hutzel Women's Hospital, Detroit, MI
| | - Edi Vaisbuch
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI.,Department of Obstetrics and Gynecology, Wayne State University/Hutzel Women's Hospital, Detroit, MI
| | - Tinnakorn Chaiworapongsa
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI.,Department of Obstetrics and Gynecology, Wayne State University/Hutzel Women's Hospital, Detroit, MI
| | - Samuel S. Edwin
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI
| | - Jyh Kae Nien
- Center for Perinatal Diagnosis and Research (CEDIP), Hospital Sotero del Rio, P. Universidad Catolica de Chile, Puente Alto, Chile
| | - Ricardo Gomez
- Center for Perinatal Diagnosis and Research (CEDIP), Hospital Sotero del Rio, P. Universidad Catolica de Chile, Puente Alto, Chile
| | - Jimmy Espinoza
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI.,Department of Obstetrics and Gynecology, Wayne State University/Hutzel Women's Hospital, Detroit, MI
| | - Claire Kendal-Wright
- University of Hawaii, John A. Burns School of Medicine, Department of Obstetrics, Gynecology and Women's Health, Honolulu, HI
| | - Sonia S. Hassan
- Perinatology Research Branch, Intramural Division, NICHD/NIH/DHHS, Hutzel Women's Hospital, Bethesda, MD, and Detroit, MI.,Department of Obstetrics and Gynecology, Wayne State University/Hutzel Women's Hospital, Detroit, MI
| | - Gillian Bryant-Greenwood
- University of Hawaii, John A. Burns School of Medicine, Department of Obstetrics, Gynecology and Women's Health, Honolulu, HI
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Park KS, Lee HY, Lee SY, Kim MK, Kim SD, Kim JM, Yun J, Im DS, Bae YS. Lysophosphatidylethanolamine stimulates chemotactic migration and cellular invasion in SK-OV3 human ovarian cancer cells: involvement of pertussis toxin-sensitive G-protein coupled receptor. FEBS Lett 2007; 581:4411-6. [PMID: 17719584 DOI: 10.1016/j.febslet.2007.08.014] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2007] [Revised: 07/31/2007] [Accepted: 08/01/2007] [Indexed: 11/26/2022]
Abstract
We investigated whether lysophosphatidylethanolamine (LPE) modulates cellular signaling in different cell types. SK-OV3 ovarian cancer cells and OVCAR-3 ovarian cancer cells were responsive to LPE. LPE-stimulated intracellular calcium concentration ([Ca(2+)](i)) increase was inhibited by U-73122, suggesting that LPE stimulates calcium signaling via phospholipase C activation. Moreover, pertussis toxin (PTX) almost completely inhibited [Ca(2+)](i) increase by LPE, indicating the involvement of PTX-sensitive G-proteins. Furthermore, we found that LPE stimulated chemotactic migration and cellular invasion in SK-OV3 ovarian cancer cells. We examined the role of lysophosphatidic acid receptors on LPE-stimulated cellular responses using HepG2 cells transfected with different LPA receptors, and found that LPE failed to stimulate nuclear factor kappa B-driven luciferase. We suggest that LPE stimulates a membrane bound receptor, different from well known LPA receptors, resulting in chemotactic migration and cellular invasion in SK-OV3 ovarian cancer cells.
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Affiliation(s)
- Kyoung Sun Park
- Department of Biochemistry, College of Medicine, Dong-A University, Busan 602-714, Republic of Korea
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7
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Kendal CE, Bryant-Greenwood GD. Pre-B-cell Colony-enhancing Factor (PBEF/Visfatin) Gene Expression is Modulated by NF-κB and AP-1 in Human Amniotic Epithelial Cells. Placenta 2007; 28:305-14. [PMID: 16701870 DOI: 10.1016/j.placenta.2006.03.011] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2006] [Revised: 03/02/2006] [Accepted: 03/20/2006] [Indexed: 11/22/2022]
Abstract
A localized intrauterine inflammatory response is often associated with the initiation of normal human parturition, whereas infection causes a similar but more florid response initiating preterm labor. Pre-B-cell colony-enhancing factor (PBEF) is expressed in the human fetal membranes and is up-regulated by labor, severe infection and inflammatory stimuli. The aim of this study was to determine the involvement of the transcription factors NF-kappaB and AP-1 in the response of PBEF to an inflammatory stimulus and compare it with IL-8. The results showed that this treatment of amniotic epithelial-like cells (WISH) and primary amniotic epithelial cells increased expression of PBEF and IL-8, but IL-8 responded 100-fold more than PBEF. IL-1beta treatment together with a panel of NF-kappaB and AP-1 inhibitors demonstrated the involvement of these transcription factors in the up-regulation of PBEF. These data show that an inflammatory stimulus in the fetal membranes inducing NF-kappaB and AP-1 would up-regulate PBEF as well as IL-8.
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Affiliation(s)
- C E Kendal
- Developmental and Reproductive Biology, University of Hawaii, 651 Ilalo Street, Biosciences Building, John A. Burns School of Medicine, Honolulu, HI 96813, USA.
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8
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Park KS, Kim MK, Im DS, Bae YS. Effect of lysophosphatidylglycerol on several signaling molecules in OVCAR-3 human ovarian cancer cells: involvement of pertussis toxin-sensitive G-protein coupled receptor. Biochem Pharmacol 2006; 73:675-81. [PMID: 17161826 DOI: 10.1016/j.bcp.2006.11.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2006] [Revised: 10/20/2006] [Accepted: 11/13/2006] [Indexed: 12/11/2022]
Abstract
In this study, we observed that lysophosphatidylglycerol (LPG) stimulated intracellular calcium ([Ca(2+)](i)) increase in OVCAR-3 human ovarian cancer cells. LPG-stimulated [Ca(2+)](i) increase was inhibited by U-73122 but not by U-73343, suggesting that LPG stimulates calcium signaling via phospholipase C activation. Moreover, pertussis toxin (PTX) almost completely inhibited [Ca(2+)](i) increase by LPG, indicating the activation of PTX-sensitive G-proteins. LPG-induced [Ca(2+)](i) increase was only observed in OVCAR-3 ovarian cancer cells and SK-OV3 ovarian cancer cells among tested several cell types. LPG also induced extracellular signal-regulated kinase (ERK) and Akt phosphorylation in OVCAR-3 ovarian cancer cells. Pertussis toxin did not affect the LPG-induced activation of ERK and Akt phosphorylation. We also found that LPG failed to stimulate NF-kappaB-driven luciferase activity in exogenously LPA(1), LPA(2), or LPA(3)-transfected HepG2 cells. Taken together we suggest that LPG stimulates a membrane bound receptor which is different from well-known LPA receptors (LPA(1), LPA(2), and LPA(3)), resulting in at least two different signaling cascades; one involves a pertussis toxin-sensitive and phospholipase C-dependent [Ca(2+)](i) increase, and the other involves a pertussis toxin-insensitive activation of ERK and Akt in ovarian cancer cells.
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Affiliation(s)
- Kyoung Sun Park
- Medical Research Center for Cancer Molecular Therapy, Dong-A University, Busan, Republic of Korea
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9
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Zhang Z, Liu Z, Meier KE. Lysophosphatidic acid as a mediator for proinflammatory agonists in a human corneal epithelial cell line. Am J Physiol Cell Physiol 2006; 291:C1089-98. [PMID: 16760261 DOI: 10.1152/ajpcell.00523.2005] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Lysophosphatidic acid (LPA) refers to a family of small phospholipid mediators that are generated in response to agonist stimulation in diverse cell types. LPA binds to G protein-coupled receptors to elicit numerous biological responses, including proliferation and inflammation. In this study, LPA production and response were characterized in a human corneal epithelial cell line, 2.040 pRSV-T. LPA levels in cells and medium are increased by exogenous 18:1 LPA (oleoyl-LPA), LPS, IL-1β, and TNF-α. LPS, IL-1β, and TNF-α, which mediate ocular inflammation, stimulate activation of p38, ERK, and Akt kinases in the corneal cell line. Similar responses are elicited by 18:1 LPA. Pertussis toxin (PTX) blocks LPA-induced activation of p38 and ERK but only slightly inhibits LPA-induced activation of Akt. All of the agonists tested, including LPA, stimulate proliferation of 2.040 pRSV-T cells. In these cells, both Akt and ERK pathways are important for LPA-induced proliferation. Thus PTX only partially suppresses the mitogenic response to LPA. Transcripts for the LPA receptors LPA1/EDG-2, LPA2/EDG-4, and LPA3/EDG-7 are expressed by the corneal cell line. Ki16425, an antagonist for LPA receptors, was used to explore the autocrine role of LPA. LPA-induced activations of p38, ERK, and Akt kinases, as well as proliferation, are inhibited by Ki16425. Ki16425 partially inhibits signal transduction and proliferation induced by the inflammatory agents tested. We conclude that LPA, produced in corneal epithelial cells in response to inflammatory agonists, contributes to mediating the mitogenic responses to these agonists in an autocrine fashion.
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Affiliation(s)
- Zhihong Zhang
- Dept. of Pharmaceutical Sciences, Washington State University, Pullman, WA 99164-6534, USA
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10
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Preininger AM, Henage LG, Oldham WM, Yoon EJ, Hamm HE, Brown HA. Direct Modulation of Phospholipase D Activity by Gβγ. Mol Pharmacol 2006; 70:311-8. [PMID: 16638972 DOI: 10.1124/mol.105.021451] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Phospholipase D-mediated hydrolysis of phosphatidylcholine is stimulated by protein kinase C and the monomeric G proteins Arf, RhoA, Cdc42, and Rac1, resulting in complex regulation of this enzyme. Using purified proteins, we have identified a novel inhibitor of phospholipase D activity, Gbetagamma subunits of heterotrimeric G proteins. G protein-coupled receptor activation alters affinity between Galpha and Gbetagamma subunits, allowing subsequent interaction with distinct effectors. Gbeta1gamma1 inhibited phospholipase D1 and phospholipase D2 activity, and both Gbeta1gamma1 and Gbeta1gamma2 inhibited stimulated phospholipase D1 activity in a dosedependent manner in reconstitution assays. Reconstitution assays suggest this interaction occurs through the amino terminus of phospholipase D, because Gbeta1gamma1 is unable to inhibit an amino-terminally truncated phospholipase D construct, PLD1.d311, which like full-length phospholipase D isoforms, requires phosphatidylinositol-4,5-bisphosphate for activity. Furthermore, a truncated protein consisting of the amino-terminal region of phospholipase D containing the phox/pleckstrin homology domains was found to interact with Gbeta1gamma1, unlike the PLD1.d311 recombinant protein, which lacks this domain. In vivo, expressed recombinant Gbeta1gamma2 was also found to inhibit phospholipase D activity under basal and stimulated conditions in MDA-MB-231 cells, which natively express both phospholipase D1 and phospholipase D2. These data demonstrate that Gbetagamma directly regulates phospholipase D activity in vitro and suggest a novel mechanism to negatively regulate phospholipase D signaling in vivo.
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Affiliation(s)
- A M Preininger
- Department of Pharmacology: 442 RRB, Vanderbilt University School of Medicine, 23rd Ave. South and Pierce, Nashville, TN 37232-6600, USA
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11
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Kim MK, Lee HY, Park KS, Shin EH, Jo SH, Yun J, Lee SW, Yoo YH, Lee YS, Baek SH, Bae YS. Lysophosphatidic acid stimulates cell proliferation in rat chondrocytes. Biochem Pharmacol 2005; 70:1764-71. [PMID: 16242672 DOI: 10.1016/j.bcp.2005.09.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2005] [Revised: 09/14/2005] [Accepted: 09/19/2005] [Indexed: 10/25/2022]
Abstract
Rat primary chondrocytes express the lysophosphatidic acid (LPA) receptor, LPA1, LPA3, but not LPA2. When chondrocytes were stimulated with LPA, phospholipase C-mediated cytosolic calcium increase was dramatically induced. LPA also stimulated two kinds of mitogen-activated protein kinase, extracellular signal-regulated kinase (ERK) and p38 kinase in chondrocytes. In terms of the LPA-mediated functional modulation of chondrocytes, LPA stimulated cellular proliferation. We examined the signaling pathways involved in LPA-mediated cellular proliferation. LPA-induced chondrocyte proliferation was almost completely blocked by 2'-amino-3'-methoxyflavone (PD98059) but not by 4-(4-fluorophenyl)-2-(4-methylsulfinylphenyl)-5-(4-pyridyl)1H-imidazole (SB203580), suggesting that ERK activity is essentially required for the process. Pertussis toxin almost completely inhibited the LPA-induced cellular proliferation and ERK activation, indicating the role of G(i/o) protein(s) in the processes. This study demonstrates the physiological role of LPA on the modulation of rat primary chondrocyte proliferation, and the crucial role played by ERK in the process.
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Affiliation(s)
- Mi-Kyoung Kim
- Medical Research Center for Cancer Molecular Therapy, College of Medicine, Dong-A University, Busan 602-714, Republic of Korea
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