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Vaglio-Garro A, Halasz A, Nováková E, Gasser AS, Zavadskis S, Weidinger A, Kozlov AV. Interplay between Energy Supply and Glutamate Toxicity in the Primary Cortical Culture. Biomolecules 2024; 14:543. [PMID: 38785950 PMCID: PMC11118065 DOI: 10.3390/biom14050543] [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: 02/28/2024] [Revised: 04/24/2024] [Accepted: 04/29/2024] [Indexed: 05/25/2024] Open
Abstract
Limited substrate availability because of the blood-brain barrier (BBB) has made the brain develop specific molecular mechanisms to survive, using lactate synthesized by astrocytes as a source of energy in neurons. To understand if lactate improves cellular viability and susceptibility to glutamate toxicity, primary cortical cells were incubated in glucose- or lactate-containing media and toxic concentrations of glutamate for 24 h. Cell death was determined by immunostaining and lactate dehydrogenase (LDH) release. Mitochondrial membrane potential and nitric oxide (NO) levels were measured using Tetramethylrhodamine, methyl ester (TMRM) and 4-Amino-5-Methylamino-2',7'-Difluorofluorescein Diacetate (DAF-FM) live staining, respectively. LDH activity was quantified in single cells in the presence of lactate (LDH substrate) and oxamate (LDH inhibitor). Nuclei of cells were stained with DAPI and neurons with MAP2. Based on the distance between neurons and glial cells, they were classified as linked (<10 µm) and non-linked (>10 µm) neurons. Lactate increased cell death rate and the mean value of endogenous NO levels compared to glucose incubations. Mitochondrial membrane potential was lower in the cells cultured with lactate, but this effect was reversed when glutamate was added to the lactate medium. LDH activity was higher in linked neurons compared to non-linked neurons, supporting the hypothesis of the existence of the lactate shuttle between astrocytes and at least a portion of neurons. In conclusion, glucose or lactate can equally preserve primary cortical neurons, but those neurons having a low level of LDH activity and incubated with lactate cannot cover high energetic demand solely with lactate and become more susceptible to glutamate toxicity.
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Affiliation(s)
- Annette Vaglio-Garro
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, 1200 Vienna, Austria; (A.V.-G.); (A.H.); (E.N.); (A.S.G.); (S.Z.); (A.W.)
- Austrian Cluster for Tissue Regeneration, 1200 Vienna, Austria
| | - Andrea Halasz
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, 1200 Vienna, Austria; (A.V.-G.); (A.H.); (E.N.); (A.S.G.); (S.Z.); (A.W.)
| | - Ema Nováková
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, 1200 Vienna, Austria; (A.V.-G.); (A.H.); (E.N.); (A.S.G.); (S.Z.); (A.W.)
| | - Andreas Sebastian Gasser
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, 1200 Vienna, Austria; (A.V.-G.); (A.H.); (E.N.); (A.S.G.); (S.Z.); (A.W.)
| | - Sergejs Zavadskis
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, 1200 Vienna, Austria; (A.V.-G.); (A.H.); (E.N.); (A.S.G.); (S.Z.); (A.W.)
- Austrian Cluster for Tissue Regeneration, 1200 Vienna, Austria
| | - Adelheid Weidinger
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, 1200 Vienna, Austria; (A.V.-G.); (A.H.); (E.N.); (A.S.G.); (S.Z.); (A.W.)
- Austrian Cluster for Tissue Regeneration, 1200 Vienna, Austria
| | - Andrey V. Kozlov
- Ludwig Boltzmann Institute for Traumatology, The Research Center in Cooperation with AUVA, 1200 Vienna, Austria; (A.V.-G.); (A.H.); (E.N.); (A.S.G.); (S.Z.); (A.W.)
- Austrian Cluster for Tissue Regeneration, 1200 Vienna, Austria
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López-Guzmán C, García AM, Marín P, Vásquez AM. Assessment of the Integrity and Function of Human Term Placental Explants in Short-Term Culture. Methods Protoc 2024; 7:16. [PMID: 38392690 PMCID: PMC10892929 DOI: 10.3390/mps7010016] [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: 09/29/2023] [Revised: 12/15/2023] [Accepted: 12/22/2023] [Indexed: 02/24/2024] Open
Abstract
Human placental explants (HPEs) culture has generated significant interest as a valuable in vitro model for studying tissue functions in response to adverse conditions, such as fluctuations in oxygen levels, nutrient availability, exposure to pathogenic microorganisms, and toxic compounds. HPEs offers the advantage of replicating the intricate microenvironment and cell-to-cell communication involved in this critical and transient organ. Although HPEs culture conditions have been extensively discussed, a protocol for assessing the viability and function of HPEs during short-term culture has not been previously outlined. In this study, we have developed a short-term HPEs culture protocol, specifically up to 72 h, and have employed quantitative, semi-quantitative, and qualitative analyses to evaluate tissue viability and function over time. Under our standardized conditions, placental villi explants began to regain their structural properties (the integrity of the trophoblast and villous stroma) and the functionality of the HPEs (production of angiogenic, endocrine, and immunological factors) starting from 48 h of culture. This restoration ensures a suitable environment for several applications. The data presented here can be highly valuable for laboratories aiming to implement an HPEs model, whether in the process of standardization or seeking to enhance and optimize working conditions and timing with placental tissue.
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Affiliation(s)
- Carolina López-Guzmán
- Grupo Malaria, Calle 62 # 52-59 Torre 1 Laboratorio 610, Facultad de Medicina, Universidad de Antioquia, Medellín 050001, Colombia; (C.L.-G.); (A.M.G.); (P.M.)
| | - Ana María García
- Grupo Malaria, Calle 62 # 52-59 Torre 1 Laboratorio 610, Facultad de Medicina, Universidad de Antioquia, Medellín 050001, Colombia; (C.L.-G.); (A.M.G.); (P.M.)
| | - Paula Marín
- Grupo Malaria, Calle 62 # 52-59 Torre 1 Laboratorio 610, Facultad de Medicina, Universidad de Antioquia, Medellín 050001, Colombia; (C.L.-G.); (A.M.G.); (P.M.)
| | - Ana María Vásquez
- Grupo Malaria, Calle 62 # 52-59 Torre 1 Laboratorio 610, Facultad de Medicina, Universidad de Antioquia, Medellín 050001, Colombia; (C.L.-G.); (A.M.G.); (P.M.)
- Escuela de Microbiologia, Calle 67 # 53-108, Bloque 5, Oficina 5-135, Universidad de Antioquia, Medellín 050001, Colombia
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Colson A, Depoix CL, Hubinont C, Debiève F. Isolation of Primary Cytotrophoblasts From Human Placenta at Term. Bio Protoc 2021; 11:e4185. [PMID: 34722831 DOI: 10.21769/bioprotoc.4185] [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: 03/10/2021] [Revised: 07/06/2021] [Accepted: 07/12/2021] [Indexed: 11/02/2022] Open
Abstract
The placenta is a multifaceted organ, fulfilling critical functions for the fetus and the mother. Therefore, it is a critical regulator of the pregnancy, and its dysfunction leads to diseases, including fetal growth restriction and preeclampsia. Studying the placenta is a difficult task since its existence is transient, and its structure is specific to our species. In vitro differentiation of primary cytotrophoblast isolated from term human placenta has been widely used in the placental research field as it represents a reliable model to study cellular differentiation and function. Direct alternatives include trophoblastic cell lines, explants, and organoids, but this protocol, based on the separation of the cells on a Percoll gradient, presents the advantage of being relatively cheap and easy to perform in every research laboratory. Furthermore, the 2D culture is a flexible method that can be adapted to various experimental conditions (transfection, drug exposure, metabolic study, observations, etc.), allowing mechanistic explorations of cellular processes.
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Affiliation(s)
- Arthur Colson
- Pole of Obstetrics, Institute of Experimental and Clinical Research (IREC), Catholic University of Louvain, Brussels, Belgium.,Department of Obstetrics, Saint-Luc University Hospital, Brussels, Belgium
| | - Christophe Louis Depoix
- Pole of Obstetrics, Institute of Experimental and Clinical Research (IREC), Catholic University of Louvain, Brussels, Belgium
| | - Corinne Hubinont
- Pole of Obstetrics, Institute of Experimental and Clinical Research (IREC), Catholic University of Louvain, Brussels, Belgium.,Department of Obstetrics, Saint-Luc University Hospital, Brussels, Belgium
| | - Frédéric Debiève
- Pole of Obstetrics, Institute of Experimental and Clinical Research (IREC), Catholic University of Louvain, Brussels, Belgium.,Department of Obstetrics, Saint-Luc University Hospital, Brussels, Belgium
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Acupoint Catgut Embedding Improves the Lipopolysaccharide-Induced Acute Respiratory Distress Syndrome in Rats. BIOMED RESEARCH INTERNATIONAL 2020; 2020:2394734. [PMID: 32566670 PMCID: PMC7285251 DOI: 10.1155/2020/2394734] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 02/24/2020] [Accepted: 03/06/2020] [Indexed: 12/16/2022]
Abstract
Background This study investigated the potential therapeutic effects of acupoint catgut embedding (ACE) at ST36 and BL13 on lipopolysaccharide- (LPS-) induced acute respiratory distress syndrome (ARDS) in rats. Materials and Methods Male Sprague-Dawley rats were randomized into the normal saline (NS group with a sham procedure), lipopolysaccharide (LPS group with a sham procedure), and LPS plus ACE (LPS+ACE with ACE at bilateral BL13 and ST36 acupoints one day before LPS injection) groups. After intratracheal instillation of normal saline or LPS (0.5 mg/kg), all rats were subjected to mechanical ventilation for 4 h. Their blood gas was analyzed before and after lung injury, and their lung pressure-volumes were measured longitudinally. The levels of TNF-α, IL-6, IL-10, and phosphatidylcholine (PC) and total proteins (TP) in bronchial alveolar lavage fluid (BALF) were assessed. Their wet to dry lung weight ratios, histology, myeloperoxidase (MPO), superoxide dismutase (SOD) activity, and malondialdehyde (MDA) levels were measured. Their lung aquaporin 1 (AQP1) and Occludin protein levels were analyzed. Results LPS administration significantly decreased the ratios of PaO2/FiO2 and pressure-volumes and induced lung inflammation and injury by increased concentrations of TNF-α, IL-6, IL-10, and TP in BALF and MPO and MDA in the lung but decreased PC in BALF and SOD activity in the lungs. LPS also reduced AQP1 and Occludin protein levels in the lung of rats. In contrast, ACE significantly mitigated the LPS-induced lung injury, inflammation, and oxidative stress and preserved the AQP1 and Occludin contents in the lung of rats. Conclusions ACE significantly improved respiratory function by mitigating inflammation and oxidative stress and preserving AQP1 and Occludin expression in the lung in a rat model of LPS-induced ARDS.
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Kim ML, Maloney C, Klimova N, Gurzenda E, Lin X, Arita Y, Walker T, Fazzari MJ, Hanna N. Repeated lipopolysaccharide exposure leads to placental endotoxin tolerance. Am J Reprod Immunol 2019; 81:e13080. [PMID: 30586203 DOI: 10.1111/aji.13080] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 11/12/2018] [Accepted: 11/30/2018] [Indexed: 11/29/2022] Open
Abstract
PROBLEM Placental infection induces increased levels of pro-inflammatory cytokines, which have been implicated in the pathogenesis of pre-term labor. Endotoxin tolerance is a phenomenon in which exposure to a dose of endotoxin makes tissue less responsive to subsequent exposures. The objective of our study was to determine whether repeated exposure to endotoxin will induce a tolerant phenotype in normal human second-trimester placental tissue. METHODS OF STUDY Human second-trimester placental explants from elective termination of pregnancy were cultured and exposed to endotoxin (LPS). After 24 hours, the media was collected for analysis, and the explants were re-exposed to LPS after adding fresh media for another 24 hours. This process was repeated for a total of 4 LPS doses. The media was collected from each day and analyzed for cytokine levels. RESULTS The first LPS treatment stimulated the secretion of the pro-inflammatory cytokines IL-1β and TNF-α. However, their production was significantly diminished with repeated LPS doses. Production of the anti-inflammatory cytokines, IL-1ra and IL-10, was also stimulated by the first LPS treatment, but secretion was more gradually and moderately decreased with repeated LPS doses compared to the pro-inflammatory cytokines. The ratios of the anti-inflammatory/pro-inflammatory mediators (IL-1ra/IL-1β and IL-10/TNF-α) indicate a progressively more anti-inflammatory milieu with repeated LPS doses. CONCLUSION Repeated LPS exposure of human second-trimester placental tissues induced endotoxin tolerance. We speculate that endotoxin tolerance at the maternal-fetal interface will protect the fetus from exaggerated inflammatory responses after repeated infectious exposure.
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Affiliation(s)
- Maureen L Kim
- Women and Children's Research Laboratory, NYU Winthrop Hospital, Mineola, New York.,Department of Pediatrics, NYU Winthrop Hospital, Mineola, New York
| | - Caroline Maloney
- Women and Children's Research Laboratory, NYU Winthrop Hospital, Mineola, New York.,Donald and Barbara Zucker School of Medicine and Northwell/Hofstra, Hempstead, New York
| | - Natalia Klimova
- Women and Children's Research Laboratory, NYU Winthrop Hospital, Mineola, New York.,University of Kentucky College of Dentistry, Lexington, Kentucky
| | - Ellen Gurzenda
- Women and Children's Research Laboratory, NYU Winthrop Hospital, Mineola, New York
| | - Xinhua Lin
- Women and Children's Research Laboratory, NYU Winthrop Hospital, Mineola, New York
| | - Yuko Arita
- Women and Children's Research Laboratory, NYU Winthrop Hospital, Mineola, New York
| | | | - Melissa J Fazzari
- Department of Biostatistics, NYU Winthrop Hospital, Mineola, New York
| | - Nazeeh Hanna
- Women and Children's Research Laboratory, NYU Winthrop Hospital, Mineola, New York.,Department of Pediatrics, NYU Winthrop Hospital, Mineola, New York
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