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Chavda VP, Balar PC, Nalla LV, Bezbaruah R, Gogoi NR, Gajula SNR, Peng B, Meena AS, Conde J, Prasad R. Conjugated Nanoparticles for Solid Tumor Theranostics: Unraveling the Interplay of Known and Unknown Factors. ACS Omega 2023; 8:37654-37684. [PMID: 37867666 PMCID: PMC10586263 DOI: 10.1021/acsomega.3c05069] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 09/19/2023] [Indexed: 10/24/2023]
Abstract
Cancer diagnoses have been increasing worldwide, and solid tumors are among the leading contributors to patient mortality, creating an enormous burden on the global healthcare system. Cancer is responsible for around 10.3 million deaths worldwide. Solid tumors are one of the most prevalent cancers observed in recent times. On the other hand, early diagnosis is a significant challenge that could save a person's life. Treatment with existing methods has pitfalls that limit the successful elimination of the disorder. Though nanoparticle-based imaging and therapeutics have shown a significant impact in healthcare, current methodologies for solid tumor treatment are insufficient. There are multiple complications associated with the diagnosis and management of solid tumors as well. Recently, surface-conjugated nanoparticles such as lipid nanoparticles, metallic nanoparticles, and quantum dots have shown positive results in solid tumor diagnostics and therapeutics in preclinical models. Other nanotheranostic material platforms such as plasmonic theranostics, magnetotheranostics, hybrid nanotheranostics, and graphene theranostics have also been explored. These nanoparticle theranostics ensure the appropriate targeting of tumors along with selective delivery of cargos (both imaging and therapeutic probes) without affecting the surrounding healthy tissues. Though they have multiple applications, nanoparticles still possess numerous limitations that need to be addressed in order to be fully utilized in the clinic. In this review, we outline the importance of materials and design strategies used to engineer nanoparticles in the treatment and diagnosis of solid tumors and how effectively each method overcomes the drawbacks of the current techniques. We also highlight the gaps in each material platform and how design considerations can address their limitations in future research directions.
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Affiliation(s)
- Vivek P. Chavda
- Department
of Pharmaceutics and Pharmaceutical Technology, L.M. College of Pharmacy, Ahmedabad 380001, India
| | - Pankti C. Balar
- Pharmacy
Section, L.M. College of Pharmacy, Ahmedabad 380001, India
| | - Lakshmi Vineela Nalla
- Department
of Pharmacy, Koneru Lakshmaiah Education
Foundation, Vaddeswaram, Andhra Pradesh 522302, India
| | - Rajashri Bezbaruah
- Department
of Pharmaceutical Sciences, Faculty of Science
and Engineering, Dibrugarh, 786004 Assam, India
| | - Niva Rani Gogoi
- Department
of Pharmaceutical Sciences, Faculty of Science
and Engineering, Dibrugarh, 786004 Assam, India
| | - Siva Nageswara Rao Gajula
- Department
of Pharmaceutical Analysis, GITAM School of Pharmacy, GITAM (Deemed to be University), Rushikonda, Visakhapatnam, Andhra Pradesh 530045, India
| | - Berney Peng
- Department
of Pathology and Laboratory Medicine, University
of California at Los Angeles, Los
Angeles, California 90095, United States
| | - Avtar S. Meena
- Department
of Biotechnology, All India Institute of
Medical Sciences (AIIMS), Ansari
Nagar, New Delhi 110029, India
| | - João Conde
- ToxOmics,
NOVA Medical School, Faculdade de Ciências Médicas,
NMS|FCM, Universidade Nova de Lisboa, Lisboa 1169-056, Portugal
| | - Rajendra Prasad
- School
of Biochemical Engineering, Indian Institute
of Technology (BHU), Varanasi 221005, India
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Shukla PK, Rao RG, Meena AS, Giorgianni F, Lee SC, Raju P, Shashikanth N, Shekhar C, Beranova S, Balazs L, Tigyi G, Gosain A, Rao R. Paneth cell dysfunction in radiation injury and radio-mitigation by human α-defensin 5. Front Immunol 2023; 14:1174140. [PMID: 37638013 PMCID: PMC10448521 DOI: 10.3389/fimmu.2023.1174140] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Accepted: 07/14/2023] [Indexed: 08/29/2023] Open
Abstract
Introduction The mechanism underlying radiation-induced gut microbiota dysbiosis is undefined. This study examined the effect of radiation on the intestinal Paneth cell α-defensin expression and its impact on microbiota composition and mucosal tissue injury and evaluated the radio-mitigative effect of human α-defensin 5 (HD5). Methods Adult mice were subjected to total body irradiation, and Paneth cell α-defensin expression was evaluated by measuring α-defensin mRNA by RT-PCR and α-defensin peptide levels by mass spectrometry. Vascular-to-luminal flux of FITC-inulin was measured to evaluate intestinal mucosal permeability and endotoxemia by measuring plasma lipopolysaccharide. HD5 was administered in a liquid diet 24 hours before or after irradiation. Gut microbiota was analyzed by 16S rRNA sequencing. Intestinal epithelial junctions were analyzed by immunofluorescence confocal microscopy and mucosal inflammatory response by cytokine expression. Systemic inflammation was evaluated by measuring plasma cytokine levels. Results Ionizing radiation reduced the Paneth cell α-defensin expression and depleted α-defensin peptides in the intestinal lumen. α-Defensin down-regulation was associated with the time-dependent alteration of gut microbiota composition, increased gut permeability, and endotoxemia. Administration of human α-defensin 5 (HD5) in the diet 24 hours before irradiation (prophylactic) significantly blocked radiation-induced gut microbiota dysbiosis, disruption of intestinal epithelial tight junction and adherens junction, mucosal barrier dysfunction, and mucosal inflammatory response. HD5, administered 24 hours after irradiation (treatment), reversed radiation-induced microbiota dysbiosis, tight junction and adherens junction disruption, and barrier dysfunction. Furthermore, HD5 treatment also prevents and reverses radiation-induced endotoxemia and systemic inflammation. Conclusion These data demonstrate that radiation induces Paneth cell dysfunction in the intestine, and HD5 feeding prevents and mitigates radiation-induced intestinal mucosal injury, endotoxemia, and systemic inflammation.
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Affiliation(s)
- Pradeep K. Shukla
- College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Roshan G. Rao
- College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Avtar S. Meena
- College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Francesco Giorgianni
- College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Sue Chin Lee
- College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Preeti Raju
- College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Nitesh Shashikanth
- College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Chandra Shekhar
- College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Sarka Beranova
- College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Louisa Balazs
- College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Gabor Tigyi
- College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Ankush Gosain
- College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - RadhaKrishna Rao
- College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
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Meena AS, Shukla PK, Rao R, Canelas C, Pierre JF, Rao R. TRPV6 deficiency attenuates stress and corticosterone-mediated exacerbation of alcohol-induced gut barrier dysfunction and systemic inflammation. Front Immunol 2023; 14:1093584. [PMID: 36817471 PMCID: PMC9929865 DOI: 10.3389/fimmu.2023.1093584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 01/09/2023] [Indexed: 02/05/2023] Open
Abstract
Introduction Chronic stress is co-morbid with alcohol use disorder that feedback on one another, thus impeding recovery from both disorders. Stress and the stress hormone corticosterone aggravate alcohol-induced intestinal permeability and liver damage. However, the mechanisms involved in compounding tissue injury by stress/corticosterone and alcohol are poorly defined. Here we explored the involvement of the TRPV6 channel in stress (or corticosterone) 3and alcohol-induced intestinal epithelial permeability, microbiota dysbiosis, and systemic inflammation. Methods Chronic alcohol feeding was performed on adult wild-type and Trpv6-/- mice with or without corticosterone treatment or chronic restraint stress (CRS). The barrier function was determined by evaluating inulin permeability in vivo and assessing tight junction (TJ) and adherens junction (AJ) integrity by immunofluorescence microscopy. The gut microbiota composition was evaluated by 16S rRNA sequencing and metagenomic analyses. Systemic responses were assessed by evaluating endotoxemia, systemic inflammation, and liver damage. Results Corticosterone and CRS disrupted TJ and AJ, increased intestinal mucosal permeability, and caused endotoxemia, systemic inflammation, and liver damage in wild-type but not Trpv6-/- mice. Corticosterone and CRS synergistically potentiated the alcohol-induced breakdown of intestinal epithelial junctions, mucosal barrier impairment, endotoxemia, systemic inflammation, and liver damage in wild-type but not Trpv6-/- mice. TRPV6 deficiency also blocked the effects of CRS and CRS-mediated potentiation of alcohol-induced dysbiosis of gut microbiota. Conclusions These findings indicate an essential role of TRPV6 in stress, corticosterone, and alcohol-induced intestinal permeability, microbiota dysbiosis, endotoxemia, systemic inflammation, and liver injury. This study identifies TRPV6 as a potential therapeutic target for developing treatment strategies for stress and alcohol-associated comorbidity.
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Affiliation(s)
- Avtar S. Meena
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Pradeep K. Shukla
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Rupa Rao
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Cherie Canelas
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Joseph F. Pierre
- Department of Pediatrics, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - RadhaKrishna Rao
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
- Memphis Veterans Affairs Medical Center, Memphis, TN, United States
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Adhikari P, Shukla PK, Alharthi F, Bhandari S, Meena AS, Rao R, Pradhan P. Photonics probing of pup brain tissue and molecular-specific nuclear nanostructure alterations due to fetal alcoholism via light scattering/localization approaches. J Biomed Opt 2022; 27:076002. [PMID: 35818115 PMCID: PMC9271689 DOI: 10.1117/1.jbo.27.7.076002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 06/02/2022] [Indexed: 06/15/2023]
Abstract
SIGNIFICANCE Light is a good probe for studying the nanoscale-level structural or molecular-specific structural properties of brain cells/tissue due to stress, alcohol, or any other abnormalities. Chronic alcoholism during pregnancy, i.e., fetal alcoholism, being teratogenic, results in fetal alcohol syndrome, and other neurological disorders. Understanding the nano-to-submicron scale spatial structural properties of pup brain cells/tissues using light/photonic probes could provide a plethora of information in understanding the effects of fetal alcoholism. AIM Using both light scattering and light localization techniques to probe alterations in nano- to-submicron scale mass density or refractive index fluctuations in brain cells/tissues of mice pups, exposed to fetal alcoholism. APPROACH We use the mesoscopic physics-based dual spectroscopic imaging techniques, partial wave spectroscopy (PWS) and molecular-specific inverse participation ratio (IPR) using confocal imaging, to quantify structural alterations in brain tissues and chromatin/histone in brain cells, respectively, in 60 days postnatal mice pup brain, exposed to fetal alcoholism. RESULTS The finer focusing PWS analysis on tissues shows an increase in the degree of structural disorder strength in the pup brain tissues. Furthermore, results of the molecular-specific light localization IPR technique show an increase in the degree of spatial molecular mass density structural disorder in DNA and a decrease in the degree in histone. CONCLUSIONS In particular, we characterize the spatial pup brain structures from the molecular to tissue levels and address the plausible reasons for such as mass density fluctuations in fetal alcoholism.
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Affiliation(s)
- Prakash Adhikari
- Mississippi State University, Department of Physics and Astronomy, Mississippi State, Mississippi, United States
| | - Pradeep K. Shukla
- University of Tennessee Health Science Center, Department of Physiology, Memphis, Tennessee, United States
| | - Fatemah Alharthi
- Mississippi State University, Department of Physics and Astronomy, Mississippi State, Mississippi, United States
| | - Shiva Bhandari
- Mississippi State University, Department of Physics and Astronomy, Mississippi State, Mississippi, United States
| | - Avtar S. Meena
- University of Tennessee Health Science Center, Department of Physiology, Memphis, Tennessee, United States
| | - Radhakrishna Rao
- University of Tennessee Health Science Center, Department of Physiology, Memphis, Tennessee, United States
| | - Prabhakar Pradhan
- Mississippi State University, Department of Physics and Astronomy, Mississippi State, Mississippi, United States
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Shukla PK, Meena AS, Pierre JF, Rao R. Central role of intestinal epithelial glucocorticoid receptor in alcohol- and corticosterone-induced gut permeability and systemic response. FASEB J 2022; 36:e22061. [PMID: 34861075 PMCID: PMC8647846 DOI: 10.1096/fj.202101424r] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 09/08/2021] [Revised: 10/24/2021] [Accepted: 11/08/2021] [Indexed: 01/12/2023]
Abstract
Corticosterone, the stress hormone, exacerbates alcohol-associated tissue injury, but the mechanism involved is unknown. We examined the role of the glucocorticoid receptor (GR) in corticosterone-mediated potentiation of alcohol-induced gut barrier dysfunction and systemic response. Hepatocyte-specific GR-deficient (GRΔHC ) and intestinal epithelial-specific GR-deficient (GRΔIEC ) mice were fed ethanol, combined with corticosterone treatment. Intestinal epithelial tight junction integrity, mucosal barrier function, microbiota dysbiosis, endotoxemia, systemic inflammation, liver damage, and neuroinflammation were assessed. Corticosterone potentiated ethanol-induced epithelial tight junction disruption, mucosal permeability, and inflammatory response in GRΔHC mouse colon; these effects of ethanol and corticosterone were absent in GRΔIEC mice. Gut microbiota compositions in ethanol-fed GRΔHC and GRΔIEC mice were similar to each other. However, corticosterone treatment in ethanol-fed mice shifted the microbiota composition to distinctly different directions in GRΔHC and GRΔIEC mice. Ethanol and corticosterone synergistically elevated the abundance of Enterobacteriaceae and Escherichia coli and reduced the abundance of Lactobacillus in GRΔHC mice but not in GRΔIEC mice. In GRΔHC mice, corticosterone potentiated ethanol-induced endotoxemia and systemic inflammation, but these effects were absent in GRΔIEC mice. Interestingly, ethanol-induced liver damage and its potentiation by corticosterone were observed in GRΔHC mice but not in GRΔIEC mice. GRΔIEC mice were also resistant to ethanol- and corticosterone-induced inflammatory response in the hypothalamus. These data indicate that the intestinal epithelial GR plays a central role in alcohol- and corticosterone-induced gut barrier dysfunction, microbiota dysbiosis, endotoxemia, systemic inflammation, liver damage, and neuroinflammation. This study identifies a novel target for potential therapeutic for alcohol-associated tissue injury.
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Affiliation(s)
- Pradeep K. Shukla
- Department of PhysiologyCollege of MedicineUniversity of Tennessee Health Science CenterMemphisTennesseeUSA
| | - Avtar S. Meena
- Department of PhysiologyCollege of MedicineUniversity of Tennessee Health Science CenterMemphisTennesseeUSA,Present address:
Center for Cellular and Molecular BiologyHyderabadTelanganaIndia
| | - Joseph F. Pierre
- Department of PediatricsCollege of MedicineUniversity of Tennessee Health Science CenterMemphisTennesseeUSA
| | - RadhaKrishna Rao
- Department of PhysiologyCollege of MedicineUniversity of Tennessee Health Science CenterMemphisTennesseeUSA,Memphis Veterans Affairs Medical CenterMemphisTennesseeUSA
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Shukla PK, Meena AS, Rao R. Prevention and mitigation of alcohol-induced neuroinflammation by Lactobacillus plantarum by an EGF receptor-dependent mechanism. Nutr Neurosci 2020; 25:871-883. [PMID: 32945721 DOI: 10.1080/1028415x.2020.1819105] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Neuroinflammation is implicated in the pathogenesis of alcohol use disorders. We investigated the role of Gut-Brain interactions in alcohol-induced neuroinflammation by probiotic-mediated manipulation of intestinal dysbiosis in mice. Chronic ethanol feeding induced dysbiosis, as evidenced by an increase in Firmicutes/Bacteroidetes ratio and depletion of Lactobacillus species in the colon. Ethanol increased the levels of IL-1β, IL-6, and TNFα in plasma and the mRNA for IL-1β, IL-6, TNFα, and MCP1 genes in the cerebral cortex and hippocampus. Ethanol feeding increased inulin flux from the circulation into different brain regions, accompanied by the increase in TLR4 mRNA levels in the cerebral cortex and hippocampus. The immunofluorescence confocal microscopy showed that ethanol elevates the expression of microglial activation marker TMEM119 in the cerebral cortex. Feeding L. plantarum suppressed the ethanol-induced dysbiosis to some extent, as evidenced by attenuation of ethanol effects on Firmicutes/Bacteroidetes ratio and abundance of Lactobacillus spp. L. plantarum blocked ethanol-induced elevation of plasma cytokines, inulin permeability to the brain, mRNA for TLR4, IL-1β, IL-6, TNFα, and MCP1 in brain regions, and the expression of TMEM119 in the cerebral cortex. The L. plantarum effect was absent in mice that express a dominant-negative EGFR, suggesting that the EGFR receptor plays an essential role in the protective effect of L. plantarum against ethanol-induced neuroinflammation. L. plantarum, when administered after chronic ethanol-induced injury, rescued the ethanol-induced systemic inflammation and neuroinflammation. This study demonstrates that L. plantarum in the gut prevents and mitigates ethanol-induced neuroinflammation by an EGFR-dependent mechanism.
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Affiliation(s)
- Pradeep K Shukla
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Avtar S Meena
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN, USA
| | - RadhaKrishna Rao
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN, USA
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Shukla PK, Meena AS, Gangwar R, Szabo E, Balogh A, Chin Lee S, Vandewalle A, Tigyi G, Rao R. LPAR2 receptor activation attenuates radiation-induced disruption of apical junctional complexes and mucosal barrier dysfunction in mouse colon. FASEB J 2020; 34:11641-11657. [PMID: 32654268 DOI: 10.1096/fj.202000544r] [Citation(s) in RCA: 6] [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: 03/09/2020] [Revised: 05/28/2020] [Accepted: 06/15/2020] [Indexed: 01/13/2023]
Abstract
The tight junction (TJ) and barrier function of colonic epithelium is highly sensitive to ionizing radiation. We evaluated the effect of lysophosphatidic acid (LPA) and its analog, Radioprotein-1, on γ-radiation-induced colonic epithelial barrier dysfunction using Caco-2 and m-ICC12 cell monolayers in vitro and mice in vivo. Mice were subjected to either total body irradiation (TBI) or partial body irradiation (PBI-BM5). Intestinal barrier function was assessed by analyzing immunofluorescence localization of TJ proteins, mucosal inulin permeability, and plasma lipopolysaccharide (LPS) levels. Oxidative stress was analyzed by measuring protein thiol oxidation and antioxidant mRNA. In Caco-2 and m-ICC12 cell monolayers, LPA attenuated radiation-induced redistribution of TJ proteins, which was blocked by a Rho-kinase inhibitor. In mice, TBI and PBI-BM5 disrupted colonic epithelial tight junction and adherens junction, increased mucosal permeability, and elevated plasma LPS; TJ disruption by TBI was more severe in Lpar2-/- mice compared to wild-type mice. RP1, administered before or after irradiation, alleviated TBI and PBI-BM5-induced TJ disruption, barrier dysfunction, and endotoxemia accompanied by protein thiol oxidation and downregulation of antioxidant gene expression, cofilin activation, and remodeling of the actin cytoskeleton. These data demonstrate that LPAR2 receptor activation prevents and mitigates γ-irradiation-induced colonic mucosal barrier dysfunction and endotoxemia.
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Affiliation(s)
- Pradeep K Shukla
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Avtar S Meena
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Ruchika Gangwar
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Erzsebet Szabo
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Andrea Balogh
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Sue Chin Lee
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Alain Vandewalle
- INSERM U773, Centre de Recherche Biomédicale, Bichat-Beaujon, CRB3, UFR de Médecine, Paris Cedex 18, France
| | - Gabor Tigyi
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - RadhaKrishna Rao
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
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Kuprys PV, Tsukamoto H, Gao B, Jia L, McGowan J, Coopersmith CM, Moreno MC, Hulsebus H, Meena AS, Souza-Smith FM, Roper P, Foster MT, Raju SV, Marshall SA, Fujita M, Curtis BJ, Wyatt TA, Mandrekar P, Kovacs EJ, Choudhry MA. Summary of the 2018 Alcohol and Immunology Research Interest Group (AIRIG) meeting. Alcohol 2019; 77:11-18. [PMID: 30763905 PMCID: PMC6733262 DOI: 10.1016/j.alcohol.2018.08.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 07/18/2018] [Revised: 08/20/2018] [Accepted: 08/20/2018] [Indexed: 02/08/2023]
Abstract
On January 26, 2018, the 23rd annual Alcohol and Immunology Research Interest Group (AIRIG) meeting was held at the University of Colorado Denver, Anschutz Medical Campus, Aurora, Colorado. The meeting consisted of plenary sessions with oral presentations and a poster presentation session. There were four plenary sessions that covered a wide range of topics relating to alcohol use: Alcohol and Liver Disease; Alcohol, Inflammation and Immune Response; Alcohol and Organ Injury; Heath Consequences and Alcohol Drinking. The meeting provided a forum for the presentation and discussion of novel research findings regarding alcohol use and immunology.
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Affiliation(s)
- Paulius V. Kuprys
- Department of Surgery, Alcohol Research Program, Burn & Shock Trauma Research Institute, Loyola University Chicago Health Sciences Division, Maywood, IL, United States
| | - Hidekazu Tsukamoto
- Southern California Research Center for ALPD, Cirrhosis and Department of Pathology, University of Southern California, Greater Los Angeles Veterans Affairs Health Care System, Los Angeles, CA, United States
| | - Bin Gao
- National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD, United States
| | - Lin Jia
- Department of Internal Medicine, Division of Hypothalamic Research, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, United States
| | - Jacob McGowan
- Department of Environmental, Agricultural and Occupational Health, University of Nebraska Medical Center, Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, NE, United States
| | | | - Maria Camargo Moreno
- Department of Surgery, Alcohol Research Program, Burn & Shock Trauma Research Institute, Loyola University Chicago Health Sciences Division, Maywood, IL, United States
| | - Holly Hulsebus
- Alcohol Research Program, Burn Research Program, Division of GI, Trauma and Endocrine Surgery, Department of Surgery, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, United States
| | - Avtar S. Meena
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Flavia M. Souza-Smith
- Department of Physiology, Louisiana State University Health Sciences Center, New Orleans, LA, United States
| | - Philip Roper
- Department of Surgery, Alcohol Research Program, Burn & Shock Trauma Research Institute, Loyola University Chicago Health Sciences Division, Maywood, IL, United States
| | - Michelle T. Foster
- Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, United States
| | - S. Vamsee Raju
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - S. Alex Marshall
- Department of Basic Pharmaceutical Sciences, High Point University Fred Wilson School of Pharmacy, High Point, NC, United States
| | - Mayumi Fujita
- Department of Dermatology, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, United States
| | - Brenda J. Curtis
- Alcohol Research Program, Burn Research Program, Division of GI, Trauma and Endocrine Surgery, Department of Surgery, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, United States
| | - Todd A. Wyatt
- Department of Environmental, Agricultural and Occupational Health, University of Nebraska Medical Center, Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, NE, United States
| | - Pranoti Mandrekar
- Department of Medicine, University of Massachusetts Medical School, Worcester, MA, United States
| | - Elizabeth J. Kovacs
- Alcohol Research Program, Burn Research Program, Division of GI, Trauma and Endocrine Surgery, Department of Surgery, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, United States
| | - Mashkoor A. Choudhry
- Department of Surgery, Alcohol Research Program, Burn & Shock Trauma Research Institute, Loyola University Chicago Health Sciences Division, Maywood, IL, United States,Corresponding author. Alcohol Research Program, Burn & Shock Trauma, Research Institute, Loyola University Chicago Health Sciences Division, 2160 South, First Ave., Maywood, IL 60153, United States. Fax: +1 708 327 2813. (M.A. Choudhry)
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Shukla PK, Meena AS, Rao R, Rao R. Deletion of TLR-4 attenuates fetal alcohol exposure-induced gene expression and social interaction deficits. Alcohol 2018; 73:73-78. [PMID: 30312858 DOI: 10.1016/j.alcohol.2018.04.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 03/30/2018] [Accepted: 04/12/2018] [Indexed: 12/12/2022]
Abstract
Fetal alcohol spectrum disorders (FASD) are associated with social interaction behavior and gastrointestinal (GI) abnormalities. These abnormal behaviors and GI abnormalities overlap with autism spectrum disorder (ASD). We investigated the effect of fetal alcohol exposure (FAE) on social interaction deficits (hallmark of autism) in mice. Evidence indicates that exogenous lipopolysaccharide (LPS) administration during gestation induces autism-like behavior in the offspring. LPS regulates the expression of genes underlying differentiation, immune function, myelination, and synaptogenesis in fetal brain by the LPS receptor, TLR-4-dependent mechanism. In this study, we evaluated the role of TLR-4 in FAE-induced social behavior deficit. WT and TLR4-/- pregnant mice were fed Lieber-DeCarli liquid diet with or without ethanol. The control group was pair-fed with an isocaloric diet. Social behavior was tested in the adult offspring at postnatal day 60. Frontal cortex mRNA expression of autistic candidate genes (Ube3a, Gabrb3, Mecp2) and inflammatory cytokine genes (IL-1β, IL-6, TNF-α) were measured by RT-qPCR. Adult male offspring of ethanol-fed WT dams showed low birth weight compared to offspring of pair-fed WT dams. However, their body weights at adulthood were greater compared to the body weights of offspring of pair-fed WT dams. There were no body weight differences in offspring of TLR4-/- dams. Social interaction deficit was observed only in male offspring of ethanol-fed WT dams, but it was not observed in both male and female offspring of ethanol-fed TLR4-/- dams. Expressions of autism candidate genes, Gabrb3 and Ube3a, were elevated, while that of the Mecp2 gene was suppressed in the frontal cortex of male, but not female, offspring of ethanol-fed WT mice. The expressions of inflammatory cytokine genes, IL-1β, IL-6, and TNF-α, were also significantly increased in the frontal cortex of male, but not female, offspring of ethanol-fed dams. The changes in the expression of autistic and cytokine genes were unaffected in the offspring of ethanol-fed TLR4-/- dams. These data also indicate that TLR4 mediates FAE-induced changes in social interactions and gene expression in brain, suggesting that ethanol-induced LPS absorption from the maternal gut may be involved in gene expression changes in the fetal brain.
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Affiliation(s)
- Pradeep K Shukla
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN 38163, USA.
| | - Avtar S Meena
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Rupa Rao
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - RadhaKrishna Rao
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN 38163, USA
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10
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Meena AS, Shukla PK, Sheth P, Rao R. EGF receptor plays a role in the mechanism of glutamine-mediated prevention of alcohol-induced gut barrier dysfunction and liver injury. J Nutr Biochem 2018; 64:128-143. [PMID: 30502657 DOI: 10.1016/j.jnutbio.2018.10.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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: 05/17/2018] [Revised: 10/20/2018] [Accepted: 10/30/2018] [Indexed: 12/12/2022]
Abstract
Recent study indicated that glutamine prevents alcoholic tissue injury in mouse gut and liver. Here we investigated the potential role of Epidermal Growth Factor Receptor (EGFR) in glutamine-mediated prevention of ethanol-induced colonic barrier dysfunction, endotoxemia and liver damage. Wild-type and EGFR*Tg transgenic (expressing dominant negative EGFR) mice were fed 1-6% ethanol in Lieber-DeCarli diet. Gut permeability was measured by vascular-to-luminal flux of FITC-inulin, and junctional integrity assessed by confocal microscopy. Liver injury was evaluated by plasma transaminases, histopathology and triglyceride analyses. Glutamine effect on acetaldehyde-induced tight junction disruption was investigated in Caco-2 cell monolayers. Doxycycline-induced expression of EGFR* blocked glutamine-mediated prevention of ethanol-induced disruption of colonic epithelial tight junction, mucosal permeability and endotoxemia. Ethanol activated cofilin and disrupted actin cytoskeleton, which was blocked by glutamine in an EGFR-dependent mechanism. Ethanol down-regulated antioxidant gene expression and up-regulated cytokine and chemokine gene expression, which were blocked by glutamine in wild-type mice in the presence or absence of doxycycline, but not in EGFR*Tg mice in the presence of doxycycline. Histopathology, plasma transaminases, triglyceride and expression of chemokine and antioxidant genes indicated ethanol-induced liver damage, which were blocked by glutamine in an EGFR-dependent mechanism. Src kinase activity and extracellular ligand binding domain of EGFR are required for glutamine-mediated protection of barrier function in Caco-2 cell monolayers. Glutamine released metalloproteinases into the medium, and metalloproteinase inhibitors blocked glutamine-mediated protection of barrier function. Results demonstrate that EGFR plays an important role in glutamine-mediated prevention of alcoholic gut permeability, endotoxemia and liver damage.
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Affiliation(s)
- Avtar S Meena
- Department of Physiology, University of Tennessee Health Science Center, 3 Dunlap Street, Suite S303, Memphis, TN 38103
| | - Pradeep K Shukla
- Department of Physiology, University of Tennessee Health Science Center, 3 Dunlap Street, Suite S303, Memphis, TN 38103
| | - Parimal Sheth
- Department of Physiology, University of Tennessee Health Science Center, 3 Dunlap Street, Suite S303, Memphis, TN 38103
| | - RadhaKrishna Rao
- Department of Physiology, University of Tennessee Health Science Center, 3 Dunlap Street, Suite S303, Memphis, TN 38103.
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11
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Thompson KE, Ray RM, Alli S, Ge W, Boler A, Shannon McCool W, Meena AS, Shukla PK, Rao R, Johnson LR, Miller MA, Tigyi GJ. Prevention and treatment of secretory diarrhea by the lysophosphatidic acid analog Rx100. Exp Biol Med (Maywood) 2018; 243:1056-1065. [PMID: 30253666 DOI: 10.1177/1535370218803349] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
IMPACT STATEMENT A critical barrier in treating diarrheal disease is easy-to-use effective treatments. Rx100 is a first in class, novel small molecule that has shown efficacy after both subcutaneous and oral administration in a mouse cholera-toxin- and Citrobacter rodentium infection-induced diarrhea models. Our findings indicate that Rx100 a metabolically stable analog of the lipid mediator lysophosphatidic acid blocks activation of CFTR-mediated secretion responsible for fluid discharge in secretory diarrhea. Rx100 represents a new treatment modality which does not directly block CFTR but attenuates its activation by bacterial toxins. Our results provide proof-of-principle that Rx100 can be developed for use as an effective oral or injectable easy-to-use drug for secretory diarrhea which could significantly improve care by eliminating the need for severely ill patients to regularly consume large quantities of oral rehydration therapies and offering options for pediatric patients.
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Affiliation(s)
- Karin E Thompson
- 1 RxBio, Inc., Johnson City, TN 37604, USA.,*These authors contributed equally to this paper
| | - Ramesh M Ray
- 1 RxBio, Inc., Johnson City, TN 37604, USA.,*These authors contributed equally to this paper
| | | | - Wenbo Ge
- 1 RxBio, Inc., Johnson City, TN 37604, USA
| | | | | | - Avtar S Meena
- 2 Department of Physiology, The University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Pradeep K Shukla
- 2 Department of Physiology, The University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Radakrishna Rao
- 2 Department of Physiology, The University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Leonard R Johnson
- 1 RxBio, Inc., Johnson City, TN 37604, USA.,2 Department of Physiology, The University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Mark A Miller
- 3 Microbiology Immunology and Biochemistry, The University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Gabor J Tigyi
- 1 RxBio, Inc., Johnson City, TN 37604, USA.,2 Department of Physiology, The University of Tennessee Health Science Center, Memphis, TN 38163, USA
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12
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Shukla PK, Meena AS, Manda B, Gomes-Solecki M, Dietrich P, Dragatsis I, Rao R. Lactobacillus plantarum prevents and mitigates alcohol-induced disruption of colonic epithelial tight junctions, endotoxemia, and liver damage by an EGF receptor-dependent mechanism. FASEB J 2018; 32:fj201800351R. [PMID: 29912589 PMCID: PMC6181630 DOI: 10.1096/fj.201800351r] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 05/14/2018] [Indexed: 12/11/2022]
Abstract
Pathogenesis of alcohol-related diseases such as alcoholic hepatitis involves gut barrier dysfunction, endotoxemia, and toxin-mediated cellular injury. Here we show that Lactobacillus plantarum not only blocks but also mitigates ethanol (EtOH)-induced gut and liver damage in mice. L. plantarum blocks EtOH-induced protein thiol oxidation, and down-regulation of antioxidant gene expression in colon L. plantarum also blocks EtOH-induced expression of TNF-α, IL-1β, IL-6, monocyte chemotactic protein 1 ( MCP1), C-X-C motif chemokine ligand ( CXCL)1, and CXCL2 genes in colon. Epidermal growth factor receptor (EGFR) signaling mediates the L. plantarum-mediated protection of tight junctions (TJs) and barrier function from acetaldehyde, the EtOH metabolite, in Caco-2 cell monolayers. In mice, doxycycline-mediated expression of dominant negative EGFR blocks L. plantarum-mediated prevention of EtOH-induced TJ disruption, mucosal barrier dysfunction, oxidative stress, and inflammatory response in colon. L. plantarum blocks EtOH-induced endotoxemia as well as EtOH-induced pathologic lesions, triglyceride deposition, oxidative stress, and inflammatory responses in the liver by an EGFR-dependent mechanism. L. plantarum treatment after injury accelerated recovery from EtOH-induced TJ, barrier dysfunction, oxidative stress, and inflammatory response in colon, endotoxemia, and liver damage. Results demonstrate that L. plantarum has both preventive and therapeutic values in treatment of alcohol-induced tissue injury, particularly in alcoholic hepatitis.-Shukla, P. K., Meena, A. S., Manda, B., Gomes-Solecki, M., Dietrich, P., Dragatsis, I., Rao, R. Lactobacillus plantarum prevents and mitigates alcohol-induced disruption of colonic epithelial tight junctions, endotoxemia, and liver damage by an EGF receptor-dependent mechanism.
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Affiliation(s)
- Pradeep K. Shukla
- Department of Physiology, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Avtar S. Meena
- Department of Physiology, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Bhargavi Manda
- Department of Physiology, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Maria Gomes-Solecki
- Department of Microbiology, Immunology, and Biochemistry, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Paula Dietrich
- Department of Physiology, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Ioannis Dragatsis
- Department of Physiology, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - RadhaKrishna Rao
- Department of Physiology, University of Tennessee Health Science Center, Memphis, Tennessee, USA
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Manda B, Mir H, Gangwar R, Meena AS, Amin S, Shukla PK, Dalal K, Suzuki T, Rao R. Phosphorylation hotspot in the C-terminal domain of occludin regulates the dynamics of epithelial junctional complexes. J Cell Sci 2018; 131:jcs206789. [PMID: 29507118 PMCID: PMC5963837 DOI: 10.1242/jcs.206789] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 02/21/2018] [Indexed: 12/14/2022] Open
Abstract
The apical junctional complex (AJC), which includes tight junctions (TJs) and adherens junctions (AJs), determines the epithelial polarity, cell-cell adhesion and permeability barrier. An intriguing characteristic of a TJ is the dynamic nature of its multiprotein complex. Occludin is the most mobile TJ protein, but its significance in TJ dynamics is poorly understood. On the basis of phosphorylation sites, we distinguished a sequence in the C-terminal domain of occludin as a regulatory motif (ORM). Deletion of ORM and expression of a deletion mutant of occludin in renal and intestinal epithelia reduced the mobility of occludin at the TJs. ORM deletion attenuated Ca2+ depletion, osmotic stress and hydrogen peroxide-induced disruption of TJs, AJs and the cytoskeleton. The double point mutations T403A/T404A, but not T403D/T404D, in occludin mimicked the effects of ORM deletion on occludin mobility and AJC disruption by Ca2+ depletion. Both Y398A/Y402A and Y398D/Y402D double point mutations partially blocked AJC disruption. Expression of a deletion mutant of occludin attenuated collective cell migration in the renal and intestinal epithelia. Overall, this study reveals the role of ORM and its phosphorylation in occludin mobility, AJC dynamics and epithelial cell migration.
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Affiliation(s)
- Bhargavi Manda
- Departments of Physiology, University of Tennessee Health Science Center, 3 North Dunlap, Memphis, TN, 38103 USA
| | - Hina Mir
- Departments of Physiology, University of Tennessee Health Science Center, 3 North Dunlap, Memphis, TN, 38103 USA
| | - Ruchika Gangwar
- Departments of Physiology, University of Tennessee Health Science Center, 3 North Dunlap, Memphis, TN, 38103 USA
| | - Avtar S Meena
- Departments of Physiology, University of Tennessee Health Science Center, 3 North Dunlap, Memphis, TN, 38103 USA
| | - Shrunali Amin
- Departments of Physiology, University of Tennessee Health Science Center, 3 North Dunlap, Memphis, TN, 38103 USA
| | - Pradeep K Shukla
- Departments of Physiology, University of Tennessee Health Science Center, 3 North Dunlap, Memphis, TN, 38103 USA
| | - Kesha Dalal
- Departments of Physiology, University of Tennessee Health Science Center, 3 North Dunlap, Memphis, TN, 38103 USA
| | - Takuya Suzuki
- Departments of Physiology, University of Tennessee Health Science Center, 3 North Dunlap, Memphis, TN, 38103 USA
| | - RadhaKrishna Rao
- Departments of Physiology, University of Tennessee Health Science Center, 3 North Dunlap, Memphis, TN, 38103 USA
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14
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Samak G, Gangwar R, Meena AS, Rao RG, Shukla PK, Manda B, Narayanan D, Jaggar JH, Rao R. Calcium Channels and Oxidative Stress Mediate a Synergistic Disruption of Tight Junctions by Ethanol and Acetaldehyde in Caco-2 Cell Monolayers. Sci Rep 2016; 6:38899. [PMID: 27958326 PMCID: PMC5153649 DOI: 10.1038/srep38899] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 11/14/2016] [Indexed: 12/13/2022] Open
Abstract
Ethanol is metabolized into acetaldehyde in most tissues. In this study, we investigated the synergistic effect of ethanol and acetaldehyde on the tight junction integrity in Caco-2 cell monolayers. Expression of alcohol dehydrogenase sensitized Caco-2 cells to ethanol-induced tight junction disruption and barrier dysfunction, whereas aldehyde dehydrogenase attenuated acetaldehyde-induced tight junction disruption. Ethanol up to 150 mM did not affect tight junction integrity or barrier function, but it dose-dependently increased acetaldehyde-mediated tight junction disruption and barrier dysfunction. Src kinase and MLCK inhibitors blocked this synergistic effect of ethanol and acetaldehyde on tight junction. Ethanol and acetaldehyde caused a rapid and synergistic elevation of intracellular calcium. Calcium depletion by BAPTA or Ca2+-free medium blocked ethanol and acetaldehyde-induced barrier dysfunction and tight junction disruption. Diltiazem and selective knockdown of TRPV6 or CaV1.3 channels, by shRNA blocked ethanol and acetaldehyde-induced tight junction disruption and barrier dysfunction. Ethanol and acetaldehyde induced a rapid and synergistic increase in reactive oxygen species by a calcium-dependent mechanism. N-acetyl-L-cysteine and cyclosporine A, blocked ethanol and acetaldehyde-induced barrier dysfunction and tight junction disruption. These results demonstrate that ethanol and acetaldehyde synergistically disrupt tight junctions by a mechanism involving calcium, oxidative stress, Src kinase and MLCK.
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Affiliation(s)
- Geetha Samak
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Memphis TN 38163, USA
| | - Ruchika Gangwar
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Memphis TN 38163, USA
| | - Avtar S Meena
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Memphis TN 38163, USA
| | - Roshan G Rao
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Memphis TN 38163, USA
| | - Pradeep K Shukla
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Memphis TN 38163, USA
| | - Bhargavi Manda
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Memphis TN 38163, USA
| | - Damodaran Narayanan
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Memphis TN 38163, USA
| | - Jonathan H Jaggar
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Memphis TN 38163, USA
| | - RadhaKrishna Rao
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Memphis TN 38163, USA
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15
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Shukla PK, Gangwar R, Manda B, Meena AS, Yadav N, Szabo E, Balogh A, Lee SC, Tigyi G, Rao R. Rapid disruption of intestinal epithelial tight junction and barrier dysfunction by ionizing radiation in mouse colon in vivo: protection by N-acetyl-l-cysteine. Am J Physiol Gastrointest Liver Physiol 2016; 310:G705-15. [PMID: 26822914 PMCID: PMC4867328 DOI: 10.1152/ajpgi.00314.2015] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 01/12/2016] [Indexed: 01/31/2023]
Abstract
The goals of this study were to evaluate the effects of ionizing radiation on apical junctions in colonic epithelium and mucosal barrier function in mice in vivo. Adult mice were subjected to total body irradiation (4 Gy) with or without N-acetyl-l-cysteine (NAC) feeding for 5 days before irradiation. At 2-24 h postirradiation, the integrity of colonic epithelial tight junctions (TJ), adherens junctions (AJ), and the actin cytoskeleton was assessed by immunofluorescence microscopy and immunoblot analysis of detergent-insoluble fractions for TJ and AJ proteins. The barrier function was evaluated by measuring vascular-to-luminal flux of fluorescein isothiocyanate (FITC)-inulin in vivo and luminal-to-mucosal flux in vitro. Oxidative stress was evaluated by measuring protein thiol oxidation. Confocal microscopy showed that radiation caused redistribution of occludin, zona occludens-1, claudin-3, E-cadherin, and β-catenin, as well as the actin cytoskeleton as early as 2 h postirradiation, and this effect was sustained for at least 24 h. Feeding NAC before irradiation blocked radiation-induced disruption of TJ, AJ, and the actin cytoskeleton. Radiation increased mucosal permeability to inulin in colon, which was blocked by NAC feeding. The level of reduced-protein thiols in colon was depleted by radiation with a concomitant increase in the level of oxidized-protein thiol. NAC feeding blocked the radiation-induced protein thiol oxidation. These data demonstrate that radiation rapidly disrupts TJ, AJ, and the actin cytoskeleton by an oxidative stress-dependent mechanism that can be prevented by NAC feeding.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - RadhaKrishna Rao
- Department of Physiology, University of Tennessee Health Science Center, Memphis, Tennessee
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16
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Shukla PK, Chaudhry KK, Mir H, Gangwar R, Yadav N, Manda B, Meena AS, Rao R. Chronic ethanol feeding promotes azoxymethane and dextran sulfate sodium-induced colonic tumorigenesis potentially by enhancing mucosal inflammation. BMC Cancer 2016; 16:189. [PMID: 26951793 PMCID: PMC4782373 DOI: 10.1186/s12885-016-2180-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2015] [Accepted: 02/15/2016] [Indexed: 02/01/2023] Open
Abstract
Background Alcohol consumption is one of the major risk factors for colorectal cancer. However, the mechanism involved in this effect of alcohol is unknown. Methods We evaluated the effect of chronic ethanol feeding on azoxymethane and dextran sulfate sodium (AOM/DSS)-induced carcinogenesis in mouse colon. Inflammation in colonic mucosa was assessed at a precancerous stage by evaluating mucosal infiltration of neutrophils and macrophages, and analysis of cytokine and chemokine gene expression. Results Chronic ethanol feeding significantly increased the number and size of polyps in colon of AOM/DSS treated mice. Confocal microscopic and immunoblot analyses showed a significant elevation of phospho-Smad, VEGF and HIF1α in the colonic mucosa. RT-PCR analysis at a precancerous stage indicated that ethanol significantly increases the expression of cytokines IL-1α, IL-6 and TNFα, and the chemokines CCL5/RANTES, CXCL9/MIG and CXCL10/IP-10 in the colonic mucosa of AOM/DSS treated mice. Confocal microscopy showed that ethanol feeding induces a dramatic elevation of myeloperoxidase, Gr1 and CD68-positive cells in the colonic mucosa of AOM/DSS-treated mice. Ethanol feeding enhanced AOM/DSS-induced suppression of tight junction protein expression and elevated cell proliferation marker, Ki-67 in the colonic epithelium. Conclusion This study demonstrates that chronic ethanol feeding promotes colonic tumorigenesis potentially by enhancing inflammation and elevation of proinflammatory cytokines and chemokines.
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Affiliation(s)
- Pradeep K Shukla
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Nash 426, Memphis, TN, 38163, USA.
| | - Kamaljit K Chaudhry
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Nash 426, Memphis, TN, 38163, USA.
| | - Hina Mir
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Nash 426, Memphis, TN, 38163, USA.
| | - Ruchika Gangwar
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Nash 426, Memphis, TN, 38163, USA.
| | - Nikki Yadav
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Nash 426, Memphis, TN, 38163, USA.
| | - Bhargavi Manda
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Nash 426, Memphis, TN, 38163, USA.
| | - Avtar S Meena
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Nash 426, Memphis, TN, 38163, USA.
| | - RadhaKrishna Rao
- Department of Physiology, University of Tennessee Health Science Center, 894 Union Avenue, Nash 426, Memphis, TN, 38163, USA.
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17
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Mir H, Meena AS, Chaudhry KK, Shukla PK, Gangwar R, Manda B, Padala MK, Shen L, Turner JR, Dietrich P, Dragatsis I, Rao R. Occludin deficiency promotes ethanol-induced disruption of colonic epithelial junctions, gut barrier dysfunction and liver damage in mice. Biochim Biophys Acta Gen Subj 2015; 1860:765-74. [PMID: 26721332 DOI: 10.1016/j.bbagen.2015.12.013] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [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: 08/18/2015] [Revised: 12/05/2015] [Accepted: 12/18/2015] [Indexed: 12/12/2022]
Abstract
BACKGROUND Disruption of epithelial tight junctions (TJ), gut barrier dysfunction and endotoxemia play crucial role in the pathogenesis of alcoholic tissue injury. Occludin, a transmembrane protein of TJ, is depleted in colon by alcohol. However, it is unknown whether occludin depletion influences alcoholic gut and liver injury. METHODS Wild type (WT) and occludin deficient (Ocln(-/-)) mice were fed 1-6% ethanol in Lieber-DeCarli diet. Gut permeability was measured by vascular-to-luminal flux of FITC-inulin. Junctional integrity was analyzed by confocal microscopy. Liver injury was assessed by plasma transaminase, histopathology and triglyceride analyses. The effect of occludin depletion on acetaldehyde-induced TJ disruption was confirmed in Caco-2 cell monolayers. RESULTS Ethanol feeding significantly reduced body weight gain in Ocln(-/-) mice. Ethanol increased inulin permeability in colon of both WT and Ocln(-/-) mice, but the effect was 4-fold higher in Ocln(-/-) mice. The gross morphology of colonic mucosa was unaltered, but ethanol disrupted the actin cytoskeleton, induced redistribution of occludin, ZO-1, E-cadherin and β-catenin from the junctions and elevated TLR4, which was more severe in Ocln(-/-) mice. Occludin knockdown significantly enhanced acetaldehyde-induced TJ disruption and barrier dysfunction in Caco-2 cell monolayers. Ethanol significantly increased liver weight and plasma transaminase activity in Ocln(-/-) mice, but not in WT mice. Histological analysis indicated more severe lesions and fat deposition in the liver of ethanol-fed Ocln(-/-) mice. Ethanol-induced elevation of liver triglyceride was also higher in Ocln(-/-) mice. CONCLUSION This study indicates that occludin deficiency increases susceptibility to ethanol-induced colonic mucosal barrier dysfunction and liver damage in mice.
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Affiliation(s)
- Hina Mir
- Department of Physiology, University of Tennessee, Memphis, TN, United States
| | - Avtar S Meena
- Department of Physiology, University of Tennessee, Memphis, TN, United States
| | - Kamaljit K Chaudhry
- Department of Physiology, University of Tennessee, Memphis, TN, United States
| | - Pradeep K Shukla
- Department of Physiology, University of Tennessee, Memphis, TN, United States
| | - Ruchika Gangwar
- Department of Physiology, University of Tennessee, Memphis, TN, United States
| | - Bhargavi Manda
- Department of Physiology, University of Tennessee, Memphis, TN, United States
| | - Mythili K Padala
- Department of Physiology, University of Tennessee, Memphis, TN, United States
| | - Le Shen
- Department of Pathology, University of Chicago, Chicago, IL, United States
| | - Jerrold R Turner
- Department of Pathology, University of Chicago, Chicago, IL, United States
| | - Paula Dietrich
- Department of Physiology, University of Tennessee, Memphis, TN, United States
| | - Ioannis Dragatsis
- Department of Physiology, University of Tennessee, Memphis, TN, United States
| | - RadhaKrishna Rao
- Department of Physiology, University of Tennessee, Memphis, TN, United States.
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18
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Singh SV, Ajay AK, Mohammad N, Malvi P, Chaube B, Meena AS, Bhat MK. Proteasomal inhibition sensitizes cervical cancer cells to mitomycin C-induced bystander effect: the role of tumor microenvironment. Cell Death Dis 2015; 6:e1934. [PMID: 26492368 PMCID: PMC4632313 DOI: 10.1038/cddis.2015.292] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2015] [Revised: 08/28/2015] [Accepted: 09/01/2015] [Indexed: 11/23/2022]
Abstract
Inaccessibility of drugs to poorly vascularized strata of tumor is one of the limiting factors in cancer therapy. With the advent of bystander effect (BE), it is possible to perpetuate the cellular damage from drug-exposed cells to the unexposed ones. However, the role of infiltrating tumor-associated macrophages (TAMs), an integral part of the tumor microenvironment, in further intensifying BE remains obscure. In the present study, we evaluated the effect of mitomycin C (MMC), a chemotherapeutic drug, to induce BE in cervical carcinoma. By using cervical cancer cells and differentiated macrophages, we demonstrate that MMC induces the expression of FasL via upregulation of PPARγ in both cell types (effector cells) in vitro, but it failed to induce bystander killing in cervical cancer cells. This effect was primarily owing to the proteasomal degradation of death receptors in the cervical cancer cells. Pre-treatment of cervical cancer cells with MG132, a proteasomal inhibitor, facilitates MMC-mediated bystander killing in co-culture and condition medium transfer experiments. In NOD/SCID mice bearing xenografted HeLa tumors administered with the combination of MMC and MG132, tumor progression was significantly reduced in comparison with those treated with either agent alone. FasL expression was increased in TAMs, and the enhanced level of Fas was observed in these tumor sections, thereby causing increased apoptosis. These findings suggest that restoration of death receptor-mediated apoptotic pathway in tumor cells with concomitant activation of TAMs could effectively restrict tumor growth.
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Affiliation(s)
- S V Singh
- National Centre for Cell Science, Savitribai Phule Pune University Campus, Ganeshkhind, Pune 411007, India
| | - A K Ajay
- National Centre for Cell Science, Savitribai Phule Pune University Campus, Ganeshkhind, Pune 411007, India
| | - N Mohammad
- National Centre for Cell Science, Savitribai Phule Pune University Campus, Ganeshkhind, Pune 411007, India
| | - P Malvi
- National Centre for Cell Science, Savitribai Phule Pune University Campus, Ganeshkhind, Pune 411007, India
| | - B Chaube
- National Centre for Cell Science, Savitribai Phule Pune University Campus, Ganeshkhind, Pune 411007, India
| | - A S Meena
- National Centre for Cell Science, Savitribai Phule Pune University Campus, Ganeshkhind, Pune 411007, India
| | - M K Bhat
- National Centre for Cell Science, Savitribai Phule Pune University Campus, Ganeshkhind, Pune 411007, India
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Saxena VK, Jha BK, Meena AS, Narula HK, Kumar D, Naqvi SMK. Assessment of Genetic Variability in the Coding Sequence of Melatonin Receptor Gene (MTNR1A) in Tropical Arid Sheep Breeds of India. Reprod Domest Anim 2015; 50:517-21. [DOI: 10.1111/rda.12503] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Accepted: 01/19/2015] [Indexed: 12/15/2022]
Affiliation(s)
- VK Saxena
- Molecular Physiology Laboratory; Division of Physiology and Biochemistry; Central Sheep and Wool Research Institute; Avikanagar Rajasthan India
| | - BK Jha
- Molecular Physiology Laboratory; Division of Physiology and Biochemistry; Central Sheep and Wool Research Institute; Avikanagar Rajasthan India
| | - AS Meena
- Division of Animal Biotechnology; Central Sheep and Wool Research Institute; Avikanagar Tonk Rajasthan India
| | - HK Narula
- Arid Region Campus; Central Sheep and Wool Research Institute; Bikaner Rajasthan India
| | - D Kumar
- Molecular Physiology Laboratory; Division of Physiology and Biochemistry; Central Sheep and Wool Research Institute; Avikanagar Rajasthan India
| | - SMK Naqvi
- Molecular Physiology Laboratory; Division of Physiology and Biochemistry; Central Sheep and Wool Research Institute; Avikanagar Rajasthan India
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Ajay AK, Meena AS, Bhat MK. Human papillomavirus 18 E6 inhibits phosphorylation of p53 expressed in HeLa cells. Cell Biosci 2012; 2:2. [PMID: 22244155 PMCID: PMC3285035 DOI: 10.1186/2045-3701-2-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Accepted: 01/13/2012] [Indexed: 11/22/2022] Open
Abstract
Background In HPV infected cells p53 function is abrogated by E6 and even ectopically expressed p53 is unable to perform tumor suppressor functions. In addition to facilitating its degradation, E6 may also inhibit p53 transactivity, though the mechanisms are still poorly understood. It has been reported that inhibition of p300, an acetyltransferase responsible for p53 acetylation is inactivated by E6. Activation of overexpressed p53 to cause cell growth inhibition is facilitated by its phosphorylation. Previously, we reported that non-genotoxically overexpressed p53 in HeLa cells needs to be phosphorylated to perform its cell growth inhibitory functions. Since over expressed p53 by itself was not activated, we hypothesized an inhibitory role for E6. Results Majority of reports proposes E6 mediated degradation of p53 as a possible reason for its inactivation. However, results presented here for the first time demonstrate that overexpressed p53 is not directly associated with E6 and therefore free, yet it is not functionally active in HPV positive cells. Also, the stability of overexpressed p53 does not seem to be an issue because inhibition of proteasomal degradation did not increase the half-life of overexpressed p53, which is more than endogenous p53. However, inhibition of proteasomal degradation prevents the degradation of endogenous p53. These findings suggest that overexpressed p53 and endogenous p53 are differentially subjected to proteasomal degradation and the reasons for this discrepancy remain unclear. Our studies demonstrate that p53 over expression has no effect on anchorage independent cell-growth and E6 nullifies its cell growth inhibitory effect. E6 overexpression abrogates OA induced p53 occupancy on the p21 promoter and cell death as well. E6 did not decrease p53 protein but phospho-p53 level was significantly reduced. Conclusion We report for the first time that E6 de-activates p53 by inhibiting its phosphorylation. This prevents p53 binding to p21 promoter and thereby restraining its cell-growth inhibitory functions. Our study provides new evidence indicating that viral protein E6 inhibits p53 transactivity by mechanism independent of degradation pathway.
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Affiliation(s)
- Amrendra K Ajay
- National Centre for Cell Science, NCCS Complex, Pune University Campus, Ganeshkhind, Pune - 411007, India.
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Kumar M, Bagchi B, Gupta SK, Meena AS, Gressens P, Mani S. Neurospheres derived from human embryoid bodies treated with retinoic Acid show an increase in nestin and ngn2 expression that correlates with the proportion of tyrosine hydroxylase-positive cells. Stem Cells Dev 2007; 16:667-81. [PMID: 17784840 DOI: 10.1089/scd.2006.0115] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
In the central nervous system (CNS), generation of phenotypic diversity within the neuronal lineage is precisely regulated in a spatial and temporal fashion. Neural basic helix-loop-helix (bHLH) transcription factors are cell intrinsic factors that control commitment to neuronal lineage and play an important role in neuronal cell type specification. The ability to differentiate human embryonic stem (hES) cells into neurons provides a good model system to address human neuronal specification. Previous studies have shown neurogenin-2 (Ngn2) to be involved in the development of mesencephalic dopaminergic neurons. Toward the goal of correlating neuronal phenotype with early gene expression pattern, we have characterized the expression of Ngn2 during hES cell differentiation. Our results show that treatment of embryoid bodies (EBs) with retinoic acid (RA) leads to the greatest proportion of tyrosine hydroxylase (TH)-positive cells followed by vasoactive intestinal peptide (VIP)-treated EBs as compared to untreated EBs. This increase in the proportion of TH-positive neurons was correlated with the unique morphology of RA-treated aggregates and the spatial delocalization of the expression of Ngn2 within the EB. Neurospheres derived from RA-treated EBs contained many nestin-positive cells within regions that expressed Ngn2. We show that the extent of nestin-positive cells that arise from the region of Ngn2 expression is correlated with the appearance of TH-positive neurons. Our results show for the first time the expression of Ngn2 during the differentiation of hES cells.
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Affiliation(s)
- Manoj Kumar
- National Brain Research Centre, Manesar, Gurgaon 122050, India
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