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Patel A, Patel P, Mandlik D, Patel K, Malaviya P, Johar K, Swamy KBS, Patel S, Tanavde V. Correction: A novel 3-miRNA network regulates tumour progression in oral squamous cell carcinoma. Biomark Res 2024; 12:28. [PMID: 38409134 PMCID: PMC10898148 DOI: 10.1186/s40364-024-00575-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024] Open
Affiliation(s)
- Aditi Patel
- Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, 380009, Ahmedabad, Gujarat, India
| | - Parina Patel
- Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, 380009, Ahmedabad, Gujarat, India
| | - Dushyant Mandlik
- Department of Head and Neck Oncology, HCG Cancer Centre, Ahmedabad, Gujarat, India
| | - Kaustubh Patel
- Department of Head and Neck Oncology, HCG Cancer Centre, Ahmedabad, Gujarat, India
| | - Pooja Malaviya
- Department of Cell and Molecular Biology, Iladevi Cataract and IOL Research Centre, Ahmedabad, Gujarat, India
| | - Kaid Johar
- Department of Zoology, BMTC and Human Genetics, School of Sciences, Gujarat University, Ahmedabad, India
| | - Krishna B S Swamy
- Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, 380009, Ahmedabad, Gujarat, India
| | - Shanaya Patel
- Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, 380009, Ahmedabad, Gujarat, India.
| | - Vivek Tanavde
- Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, 380009, Ahmedabad, Gujarat, India
- Bioinformatics Institute, Agency for Science Technology and Research (A*STAR), Singapore, Singapore
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Patel A, Patel P, Mandlik D, Patel K, Malaviya P, Johar K, Swamy KBS, Patel S, Tanavde V. A novel 3-miRNA network regulates tumour progression in oral squamous cell carcinoma. Biomark Res 2023; 11:64. [PMID: 37316916 PMCID: PMC10268489 DOI: 10.1186/s40364-023-00505-5] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 05/19/2023] [Indexed: 06/16/2023] Open
Abstract
BACKGROUND Late diagnosis is one of the major confounders in oral squamous cell carcinoma (OSCC). Despite recent advances in molecular diagnostics, no disease-specific biomarkers are clinically available for early risk prediction of OSCC. Therefore, it is important to identify robust biomarkers that are detectable using non-invasive liquid biopsy techniques to facilitate the early diagnosis of oral cancer. This study identified potential salivary exosome-derived miRNA biomarkers and crucial miRNA-mRNA networks/underlying mechanisms responsible for OSCC progression. METHODS Small RNASeq (n = 23) was performed in order to identify potential miRNA biomarkers in both tissue and salivary exosomes derived from OSCC patients. Further, integrated analysis of The Cancer Genome Atlas (TCGA) datasets (n = 114), qPCR validation on larger patient cohorts (n = 70) and statistical analysis with various clinicopathological parameters was conducted to assess the effectiveness of the identified miRNA signature. miRNA-mRNA networks and pathway analysis was conducted by integrating the transcriptome sequencing and TCGA data. The OECM-1 cell line was transfected with the identified miRNA signature in order to observe its effect on various functional mechanisms such as cell proliferation, cell cycle, apoptosis, invasive as well as migratory potential and the downstream signaling pathways regulated by these miRNA-mRNA networks. RESULTS Small RNASeq and TCGA data identified 12 differentially expressed miRNAs in OSCC patients compared to controls. On validating these findings in a larger cohort of patients, miR-140-5p, miR-143-5p, and miR-145-5p were found to be significantly downregulated. This 3-miRNA signature demonstrated higher efficacy in predicting disease progression and clinically correlated with poor prognosis (p < 0.05). Transcriptome, TCGA, and miRNA-mRNA network analysis identified HIF1a, CDH1, CD44, EGFR, and CCND1 as hub genes regulated by the miRNA signature. Further, transfection-mediated upregulation of the 3-miRNA signature significantly decreased cell proliferation, induced apoptosis, resulted in G2/M phase cell cycle arrest and reduced the invasive and migratory potential by reversing the EMT process in the OECM-1 cell line. CONCLUSIONS Thus, this study identifies a 3-miRNA signature that can be utilized as a potential biomarker for predicting disease progression of OSCC and uncovers the underlying mechanisms responsible for converting a normal epithelial cell into a malignant phenotype.
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Affiliation(s)
- Aditi Patel
- Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, Ahmedabad, 380009, Gujarat, India
| | - Parina Patel
- Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, Ahmedabad, 380009, Gujarat, India
| | - Dushyant Mandlik
- Department of Head and Neck Oncology, HCG Cancer Centre, Ahmedabad, Gujarat, India
| | - Kaustubh Patel
- Department of Head and Neck Oncology, HCG Cancer Centre, Ahmedabad, Gujarat, India
| | - Pooja Malaviya
- Department of Cell and Molecular Biology, Iladevi Cataract and IOL Research Centre, Ahmedabad, Gujarat, India
| | - Kaid Johar
- Department of Zoology, BMTC and Human Genetics, School of Sciences, Gujarat University, Ahmedabad, India
| | - Krishna B S Swamy
- Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, Ahmedabad, 380009, Gujarat, India
| | - Shanaya Patel
- Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, Ahmedabad, 380009, Gujarat, India.
| | - Vivek Tanavde
- Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, Ahmedabad, 380009, Gujarat, India.
- Bioinformatics Institute, Agency for Science Technology and Research (A*STAR), Singapore, Singapore.
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Patel D, Rathaur P, Parwani K, Patel F, Sharma D, Johar K, Mandal P. In vitro, in vivo, and in silico analysis of synbiotics as preventive interventions for lipid metabolism in ethanol-induced adipose tissue injury. Lipids Health Dis 2023; 22:49. [PMID: 37055787 PMCID: PMC10103406 DOI: 10.1186/s12944-023-01809-z] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 03/23/2023] [Indexed: 04/15/2023] Open
Abstract
The risk of alcoholic liver disease (ALD) is increased by excessive ethanol drinking. For the prevention of ALD, the effects of ethanol on the liver, adipose tissue, and gut are crucial. Interestingly, garlic and a few probiotic strains can protect against ethanol-induced hepatotoxicity. However, the relationship between adipose tissue inflammation, Kyolic aged garlic extract (AGE), and Lactobacillus rhamnosus MTCC1423 in developing ALD is unknown. Therefore, the present study explored the effect of synbiotics (a combination of prebiotics and probiotics) on adipose tissue to prevent ALD. To investigate the efficacy of synbiotics administration on adipose tissue in preventing ALD, in vitro (3T3-L1 cells, N = 3) groups: control, control + LPS (lipopolysaccharide), ethanol, ethanol + LPS, ethanol + synbiotics, ethanol + synbiotics + LPS; in vivo (Wistar male rats, N = 6) groups: control, ethanol, pairfed, ethanol + synbiotics and in silico experiments were conducted. Lactobacillus multiplies in accordance with the growth curve when exposed to AGE. Additionally, Oil red O staining and scanning electron microscopy (SEM) demonstrated that synbiotics therapy maintained the morphology of adipocytes in the alcoholic model. In support of the morphological changes, quantitative real-time PCR demonstrated overexpression of adiponectin and downregulation of leptin, resistin, PPARγ, CYP2E1, iNOS, IL-6, and TNF-α after administration of synbiotics compared to the ethanol group. In addition, MDA estimation by high-performance liquid chromatography (HPLC) indicated that the synbiotics treatment reduced oxidative stress in rat adipose tissue. Consequently, the in-silico analysis revealed that AGE inhibited the C-D-T networks as PPARγ acting as the main target protein. The current study demonstrates that using synbiotics improves adipose tissue metabolism in ALD.
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Affiliation(s)
- Dhara Patel
- P D Patel Institute of Applied Sciences, Charotar University of Science and Technology, Changa-388421, Gujarat, India
| | - Pooja Rathaur
- Department of Life Science, School of Sciences, Gujarat University, Ahmedabad, 380009, Gujarat, India
| | - Kirti Parwani
- P D Patel Institute of Applied Sciences, Charotar University of Science and Technology, Changa-388421, Gujarat, India
| | - Farhin Patel
- P D Patel Institute of Applied Sciences, Charotar University of Science and Technology, Changa-388421, Gujarat, India
| | - Dixa Sharma
- P D Patel Institute of Applied Sciences, Charotar University of Science and Technology, Changa-388421, Gujarat, India
| | - Kaid Johar
- Department of Zoology, Biomedical Technology, and Human Genetics, School of Sciences, Gujarat University, Ahmedabad, 380009, Gujarat, India
| | - Palash Mandal
- P D Patel Institute of Applied Sciences, Charotar University of Science and Technology, Changa-388421, Gujarat, India.
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Gelat B, Rathaur P, Malaviya P, Patel B, Trivedi K, Johar K, Gelat R. The intervention of epithelial-mesenchymal transition in homeostasis of human retinal pigment epithelial cells: a review. J Histotechnol 2022; 45:148-160. [DOI: 10.1080/01478885.2022.2137665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Brijesh Gelat
- Department of Zoology, BMTC and Human Genetics, School of Sciences, Gujarat University, Ahmedabad, India
| | - Pooja Rathaur
- Department of Cell and Molecular Biology, Iladevi Cataract and IOL Research Centre, Ahmedabad, Gujarat, India
| | - Pooja Malaviya
- Department of Cell and Molecular Biology, Iladevi Cataract and IOL Research Centre, Ahmedabad, Gujarat, India
| | - Binita Patel
- Department of Life Science, School of Sciences, Gujarat University, Ahmedabad, India
| | - Krupali Trivedi
- Department of Zoology, BMTC and Human Genetics, School of Sciences, Gujarat University, Ahmedabad, India
| | - Kaid Johar
- Department of Zoology, BMTC and Human Genetics, School of Sciences, Gujarat University, Ahmedabad, India
| | - Rahul Gelat
- Institute of Teaching and Research in Ayurveda (ITRA), Gujarat Ayurved University, Jamnagar, India
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Bora V, Patel D, Johar K, Goyal RK, Patel BM. Systemic study of selected histone deacetylase inhibitors in cardiac complications associated with cancer cachexia. Can J Physiol Pharmacol 2022; 100:240-251. [PMID: 34614370 DOI: 10.1139/cjpp-2021-0012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cancer cachexia is mainly characterized by wasting of skeletal muscles and fat and body weight loss, along with severe complications of major organs like liver, heart, brain and bone. There can be diminishing performance of these major organs as cancer cachexia progresses, one such drastic effect on the cardiac system. In the present study, differential effect of histone deacetylase inhibitors (HDACi) on cardiac complications associated with cancer cachexia is studied. Two models were used to induce cancer cachexia: B16F1 induced metastatic cancer cachexia and Lewis lung carcinoma cell - induced cancer cachexia. Potential of Class I HDACi entinostat, Class II HDACi MC1568, and nonspecific HDACi sodium butyrate on cardiac complications were evaluated using the cardiac hypertrophy markers, hemodynamic markers, and cardiac markers along with histopathological evaluation of heart sections by Periodic acid-Schiff staining, Masson's trichrome staining, Picro-sirius red staining, and haematoxylin and eosin staining. Immunohistochemistry evaluation by vimentin and caspase 3 protein expression was evaluated. Entinostat showed promising results by attenuating the cardiac complications, and MC1568 treatment further exacerbated the cardiac complications, while non-conclusive effect were recorded after treatment with sodium butyrate. This study will be helpful in evaluating other HDACi for potential in cardiac complications associated with cancer cachexia.
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Affiliation(s)
- Vivek Bora
- Department of Pharmacology, Institute of Pharmacy, Nirma University, Sarkhej-Gandhinagar Highway, Ahmedabad, Gujarat 382481, India
| | - Dhwani Patel
- Department of Pharmacology, Institute of Pharmacy, Nirma University, Sarkhej-Gandhinagar Highway, Ahmedabad, Gujarat 382481, India
| | - Kaid Johar
- Department of Zoology, BMTC, Human Genetics, USSC, Gujarat University, Ahmedabad, Gujarat, 380009, India
| | - Ramesh K Goyal
- Delhi Pharmaceutical Sciences Research University, Delhi, 110017, India
| | - Bhoomika M Patel
- Department of Pharmacology, Institute of Pharmacy, Nirma University, Sarkhej-Gandhinagar Highway, Ahmedabad, Gujarat 382481, India
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Shukal D, Bhadresha K, Shastri B, Mehta D, Vasavada A, Johar K. Dichloroacetate prevents TGFβ-induced epithelial-mesenchymal transition of retinal pigment epithelial cells. Exp Eye Res 2020; 197:108072. [PMID: 32473169 DOI: 10.1016/j.exer.2020.108072] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Revised: 04/30/2020] [Accepted: 05/04/2020] [Indexed: 12/13/2022]
Abstract
Proliferative retinopathies are associated with formation of fibrous epiretinal membranes. At present, there is no pharmacological intervention for the treatment of retinopathies. Cytokines such as TGFβ are elevated in the vitreous humor of the patients with proliferative vitro-retinopathy, diabetic retinopathy and age-related macular degeneration. TGFβ isoforms lead to epithelial-mesenchymal transition (EMT) or trans-differentiation of the retinal pigment epithelial (RPE) cells. PI3K/Akt and MAPK/Erk pathways play important roles in the EMT of RPE cells. Therefore, inhibition of EMT by pharmacological agents is an important therapeutic strategy in retinopathy. Dichloroacetate (DCA) is shown to prevent proliferation and EMT of cancer cell lines but its effects are not explored on the prevention of EMT of RPE cells. In the present study, we have investigated the role of DCA in preventing TGFβ2 induced EMT of RPE cell line, ARPE-19. A wound-healing assay was utilized to detect the anti-EMT effect of DCA. The expressions of EMT and cell adhesion markers were carried out by immunofluorescence, western blotting, and quantitative real-time PCR. The expression of MAPK/Erk and PI3K/Akt pathway members was carried out using western blotting. We found that TGFβ2 exposure leads to an increase in the wound healing response, expression of EMT markers (Fibronectin, Collagen I, N-cadherin, MMP9, S100A4, α-SMA, Snai1, Slug) and a decrease in the expression of cell adhesion/epithelial markers (ZO-1, Connexin 43, E-cadherin). These changes were accompanied by the activation of PI3K/Akt and MAPK/Erk pathways. Simultaneous exposure of DCA along with TGFβ2 significantly inhibited wound healing response, expression of EMT markers and cell adhesion/epithelial markers. Furthermore, DCA and TGFβ2 effectively attenuated the activation of MAPK/Erk/JNK and PI3K/Akt/GSK3β pathways. Our results demonstrate that DCA has a strong anti-EMT effect on the ARPE-19 cells and hence can be utilized as a therapeutic agent in the prevention of proliferative retinopathies.
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Affiliation(s)
- Dhaval Shukal
- Department of Cell and Molecular Biology, Iladevi Cataract and IOL Research Centre, Ahmedabad, Gujarat, India; Manipal Academy of Higher Education, Manipal, Karnataka, India.
| | - Kinjal Bhadresha
- Department of Cell and Molecular Biology, Iladevi Cataract and IOL Research Centre, Ahmedabad, Gujarat, India.
| | - Bhoomi Shastri
- Department of Cell and Molecular Biology, Iladevi Cataract and IOL Research Centre, Ahmedabad, Gujarat, India.
| | - Deval Mehta
- Department of Cell and Molecular Biology, Iladevi Cataract and IOL Research Centre, Ahmedabad, Gujarat, India.
| | - Abhay Vasavada
- Department of Cell and Molecular Biology, Iladevi Cataract and IOL Research Centre, Ahmedabad, Gujarat, India.
| | - Kaid Johar
- Department of Zoology, BMTC, Human Genetics, USSC, Gujarat University, Ahmedabad, Gujarat, India.
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Vasavada AR, Praveen MR, Shah GD, Johar K, Sankaranarayanan R. A Prospective Evaluation of Posterior Capsule Opacification in Eyes With Posterior Capsule Plaque-A Case-Control Study. Asia Pac J Ophthalmol (Phila) 2017; 6:13-20. [PMID: 28161922 DOI: 10.1097/apo.0000000000000199] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 01/18/2016] [Indexed: 11/26/2022] Open
Abstract
PURPOSE To compare the development of posterior capsule opacification (PCO) between eyes with and without posterior capsule plaque after single-piece hydrophobic acrylic intraocular lens (IOL) implantation 5 years postoperatively. DESIGN A prospective observational case-control study. METHODS One hundred one consecutive eyes with posterior capsule plaque (cases) were compared with the same number of cataractous eyes without posterior capsule plaque (controls). A detailed preoperative evaluation was done to detect the presence of posterior capsule plaque. Histomorphology of posterior capsule plaque was evaluated. Postoperatively, digital retroillumination photographic documentation was performed at 1 month and 1, 2, 3, and 5 years and analyzed for PCO using the Evaluation of Posterior Capsule Opacification (EPCO) software; EPCO scores and areas were calculated. The development of PCO and the influence of the anterior capsule cover (total and partial) on the IOL optic were compared. RESULTS Posterior capsule plaque on histomorphology showed a large amount of collagenous, fibrous extracellular matrix, and immunofluorescence staining was positive for alpha smooth muscle actin. In the development of PCO, there was no difference between cases and controls at 1 month and 1, 2, 3, and 5 years. Between the 2 groups, there was no difference in the development of PCO within total cover and within partial cover of the anterior capsule on the IOL up to 5 years. CONCLUSIONS The presence of posterior capsule plaque did not increase the incidence of PCO at 5 years.
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Affiliation(s)
- Abhay R Vasavada
- Iladevi Cataract & IOL Research Center, Raghudeep Eye Clinic, Memnagar, Ahmedabad, Gujarat, India
| | - Mamidipudi R Praveen
- Iladevi Cataract & IOL Research Center, Raghudeep Eye Clinic, Memnagar, Ahmedabad, Gujarat, India
| | - Gauri D Shah
- Iladevi Cataract & IOL Research Center, Raghudeep Eye Clinic, Memnagar, Ahmedabad, Gujarat, India
| | - Kaid Johar
- Iladevi Cataract & IOL Research Center, Raghudeep Eye Clinic, Memnagar, Ahmedabad, Gujarat, India
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Kayastha F, Johar K, Gajjar D, Arora A, Madhu H, Ganatra D, Vasavada A. Andrographolide suppresses epithelial mesenchymal transition by inhibition of MAPK signalling pathway in lens epithelial cells. J Biosci 2016; 40:313-24. [PMID: 25963259 DOI: 10.1007/s12038-015-9513-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Epithelial mesenchymal transition (EMT) of lens epithelial cells (LECs) may contribute to the development of posterior capsular opacification (PCO), which leads to visual impairment. Andrographolide has been shown to have therapeutic potential against various cancers. However, its effect on human LECs is still unknown. The purpose of this study is to evaluate the effect of andrographolide on EMT induced by growth factors in the fetal human lens epithelial cell line (FHL 124). Initially the LECs were treated with growth factors (TGF-beta 2 and bFGF) to induce EMT. Subsequently these EMT-induced cells were treated with andrographolide at 100 and 500 nM concentrations for 24 h. Our results showed that FHL 124 cells treated with growth factors had a significant decrease in protein and m-RNA levels of epithelial markers pax6 and E-Cadherin. After administering andrographolide, these levels significantly increased. It was noticed that EMT markers alpha-SMA, fibronectin and collagen IV significantly decreased after treatment with andrographolide when compared to the other group. Treatment with andrographolide significantly inhibited phosphorylation of ERK and JNK. Cell cycle analysis showed that andrographolide did not arrest cells at G0/G1 or G2/M at tested concentrations. Our findings suggest that andrographolide helps sustain epithelial characteristics by modulating EMT markers and inhibiting the mitogen-activated protein kinase (MAPK) signalling pathway in LECs. Hence it can prove to be useful in curbing EMT-mediated PCO.
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Affiliation(s)
- Forum Kayastha
- Iladevi Cataract and IOL Research Centre, Gurukul road, Memnagar, Ahmedabad 380 052, India
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Nair B, Johar K, Priya A, Wong-Riley MTT. Specificity protein 4 (Sp4) transcriptionally regulates inhibitory GABAergic receptors in neurons. Biochim Biophys Acta 2015; 1863:1-9. [PMID: 26469128 DOI: 10.1016/j.bbamcr.2015.10.005] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 10/05/2015] [Accepted: 10/10/2015] [Indexed: 10/22/2022]
Abstract
Previous studies in our laboratory have shown that the neuron-specific specificity protein 4 (Sp4) transcriptionally regulates many excitatory neurotransmitter receptor subunit genes, such as those for GluN1, GluN2A, and GluN2B of N-methyl-d-aspartate (NMDA) receptors and Gria2 of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors. It also regulates Atp1a1 and Atp1b1 subunit genes of Na(+)/K(+)-ATPase, a major energy-consuming enzyme, as well as all 13 subunits of cytochrome c oxidase (COX), an important energy-generating enzyme. Thus, there is a tight coupling between energy consumption, energy production, and excitatory neuronal activity at the transcriptional level in neurons. The question is whether inhibitory neurotransmitter receptors are also regulated by Sp4. In the present study, we tested our hypothesis that Sp4 regulates receptor subunit genes of a major inhibitory neurotransmitter, GABA, specifically GABAA receptors. By means of multiple approaches, including in silico analysis, electrophoretic mobility shift and supershift assays, real-time quantitative PCR, chromatin immunoprecipitation, promoter mutational analysis, over-expression and shRNA of Sp4, functional assays, and western blots, we found that Sp4 functionally regulates the transcription of Gabra1 (GABAA α1) and Gabra2 (GABAA α2), but not Gabra3 (GABAA α3) subunit genes. The binding sites of Sp4 are conserved among rats, humans, and mice. Thus, our results substantiate our hypothesis that Sp4 plays a key role in regulating the transcription of GABAA receptor subunit genes. They also indicate that Sp4 is in a position to transcriptionally regulate the balance between excitatory and inhibitory neurochemical expressions in neurons.
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Affiliation(s)
- Bindu Nair
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Kaid Johar
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Anusha Priya
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Margaret T T Wong-Riley
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA.
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Smuda M, Henning C, Raghavan CT, Johar K, Vasavada AR, Nagaraj RH, Glomb MA. Comprehensive analysis of maillard protein modifications in human lenses: effect of age and cataract. Biochemistry 2015; 54:2500-7. [PMID: 25849437 DOI: 10.1021/bi5013194] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In human lens proteins, advanced glycation endproducts (AGEs) originate from the reaction of glycating agents, e.g., vitamin C and glucose. AGEs have been considered to play a significant role in lens aging and cataract formation. Although several AGEs have been detected in the human lens, the contribution of individual glycating agents to their formation remains unclear. A highly sensitive liquid chromatography-tandem mass spectrometry multimethod was developed that allowed us to quantitate 21 protein modifications in normal and cataractous lenses, respectively. N(6)-Carboxymethyl lysine, N(6)-carboxyethyl lysine, N(7)-carboxyethyl arginine, methylglyoxal hydroimidazolone 1, and N(6)-lactoyl lysine were found to be the major Maillard protein modifications among these AGEs. The novel vitamin C specific amide AGEs, N(6)-xylonyl and N(6)-lyxonyl lysine, but also AGEs from glyoxal were detected, albeit in minor quantities. Among the 21 modifications, AGEs from the Amadori product (derived from the reaction of glucose and lysine) and methylglyoxal were dominant.
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Affiliation(s)
- Mareen Smuda
- †Institute of Chemistry-Food Chemistry, Martin-Luther-University Halle-Wittenberg, 06120 Halle/Saale, Germany
| | - Christian Henning
- †Institute of Chemistry-Food Chemistry, Martin-Luther-University Halle-Wittenberg, 06120 Halle/Saale, Germany
| | - Cibin T Raghavan
- ‡Department of Ophthalmology and Visual Sciences, Case Western Reserve University School of Medicine, 2085 Adelbert Road, Cleveland, Ohio 44106, United States
| | - Kaid Johar
- §Iladevi Cataract and IOL Research Center, Gurukul Road, Memnagar, Ahmedabad, Gujarat 380052, India
| | - Abhay R Vasavada
- §Iladevi Cataract and IOL Research Center, Gurukul Road, Memnagar, Ahmedabad, Gujarat 380052, India
| | - Ram H Nagaraj
- ‡Department of Ophthalmology and Visual Sciences, Case Western Reserve University School of Medicine, 2085 Adelbert Road, Cleveland, Ohio 44106, United States
| | - Marcus A Glomb
- †Institute of Chemistry-Food Chemistry, Martin-Luther-University Halle-Wittenberg, 06120 Halle/Saale, Germany
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Kayastha F, Madhu H, Vasavada A, Johar K. Andrographolide reduces proliferation and migration of lens epithelial cells by modulating PI3K/Akt pathway. Exp Eye Res 2014; 128:23-6. [DOI: 10.1016/j.exer.2014.09.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 09/08/2014] [Accepted: 09/10/2014] [Indexed: 01/10/2023]
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Linetsky M, Raghavan CT, Johar K, Fan X, Monnier VM, Vasavada AR, Nagaraj RH. UVA light-excited kynurenines oxidize ascorbate and modify lens proteins through the formation of advanced glycation end products: implications for human lens aging and cataract formation. J Biol Chem 2014; 289:17111-23. [PMID: 24798334 DOI: 10.1074/jbc.m114.554410] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [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: 12/25/2022] Open
Abstract
Advanced glycation end products (AGEs) contribute to lens protein pigmentation and cross-linking during aging and cataract formation. In vitro experiments have shown that ascorbate (ASC) oxidation products can form AGEs in proteins. However, the mechanisms of ASC oxidation and AGE formation in the human lens are poorly understood. Kynurenines are tryptophan oxidation products produced from the indoleamine 2,3-dioxygenase (IDO)-mediated kynurenine pathway and are present in the human lens. This study investigated the ability of UVA light-excited kynurenines to photooxidize ASC and to form AGEs in lens proteins. UVA light-excited kynurenines in both free and protein-bound forms rapidly oxidized ASC, and such oxidation occurred even in the absence of oxygen. High levels of GSH inhibited but did not completely block ASC oxidation. Upon UVA irradiation, pigmented proteins from human cataractous lenses also oxidized ASC. When exposed to UVA light (320-400 nm, 100 milliwatts/cm(2), 45 min to 2 h), young human lenses (20-36 years), which contain high levels of free kynurenines, lost a significant portion of their ASC content and accumulated AGEs. A similar formation of AGEs was observed in UVA-irradiated lenses from human IDO/human sodium-dependent vitamin C transporter-2 mice, which contain high levels of kynurenines and ASC. Our data suggest that kynurenine-mediated ASC oxidation followed by AGE formation may be an important mechanism for lens aging and the development of senile cataracts in humans.
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Affiliation(s)
- Mikhail Linetsky
- From the Departments of Chemistry, Ophthalmology and Visual Sciences,
| | | | - Kaid Johar
- the Iladevi Cataract and IOL Research Center, Gurukul Road, Memnagar, Ahmedabad, Gujarat-380052, India
| | | | - Vincent M Monnier
- Pathology, and Biochemistry, Case Western Reserve University, Cleveland, Ohio 44106 and
| | - Abhay R Vasavada
- the Iladevi Cataract and IOL Research Center, Gurukul Road, Memnagar, Ahmedabad, Gujarat-380052, India
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Priya A, Johar K, Nair B, Wong-Riley MTT. Specificity protein 4 (Sp4) regulates the transcription of AMPA receptor subunit GluA2 (Gria2). Biochim Biophys Acta 2014; 1843:1196-206. [PMID: 24576410 DOI: 10.1016/j.bbamcr.2014.02.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Revised: 02/14/2014] [Accepted: 02/17/2014] [Indexed: 11/24/2022]
Abstract
The alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors are important glutamatergic receptors mediating fast excitatory synaptic transmission in the brain. The regulation of the four subunits of AMPA receptors, GluA1-4, is poorly understood. Excitatory synaptic transmission is highly energy-demanding, and this energy is derived mainly from the oxidative pathway. Recently, we found that specificity factor regulates all subunits of cytochrome c oxidase (COX), a critical energy-generating enzyme. COX is also regulated by nuclear respiratory factor 1 (NRF-1), which transcriptionally controls the Gria2 (GluA2) gene of AMPA receptors. The goal of the present study was to test our hypothesis that Sp-factors (Sp1, Sp3, and/or Sp4) also regulate AMPA subunit genes. If so, we wish to determine if Sp-factors and NRF-1 function via a complementary, concurrent and parallel, or a combination of complementary and concurrent/parallel mechanism. By means of multiple approaches, including electrophoretic mobility shift and supershift assays, chromatin immunoprecipitation, promoter mutations, real-time quantitative PCR, and western blot analysis, we found that Sp4, but not Sp1 or Sp3, regulates the Gria2, but not Gria1, 3, or 4, subunit gene of the AMPA receptor in a concurrent and parallel manner with NRF-1. Thus, Sp4 and NRF-1 both mediate the tight coupling between neuronal activity and energy metabolism at the transcriptional level.
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Affiliation(s)
- Anusha Priya
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Kaid Johar
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Bindu Nair
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Margaret T T Wong-Riley
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA.
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Johar K, Priya A, Wong-Riley MTT. Regulation of Na(+)/K(+)-ATPase by neuron-specific transcription factor Sp4: implication in the tight coupling of energy production, neuronal activity and energy consumption in neurons. Eur J Neurosci 2013; 39:566-78. [PMID: 24219545 DOI: 10.1111/ejn.12415] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 10/03/2013] [Accepted: 10/07/2013] [Indexed: 12/24/2022]
Abstract
A major source of energy demand in neurons is the Na(+)/K(+)-ATPase pump that restores the ionic gradient across the plasma membrane subsequent to depolarizing neuronal activity. The energy comes primarily from mitochondrial oxidative metabolism, of which cytochrome c oxidase (COX) is a key enzyme. Recently, we found that all 13 subunits of COX are regulated by specificity (Sp) factors, and that the neuron-specific Sp4, but not Sp1 or Sp3, regulates the expression of key glutamatergic receptor subunits as well. The present study sought to test our hypothesis that Sp4 also regulates Na(+)/K(+)-ATPase subunit genes in neurons. By means of multiple approaches, including in silico analysis, electrophoretic mobility shift and supershift assays, chromatin immunoprecipitation, promoter mutational analysis, over-expression, and RNA interference studies, we found that Sp4, with minor contributions from Sp1 and Sp3, functionally regulate the Atp1a1, Atp1a3, and Atp1b1 subunit genes of Na(+)/K(+)-ATPase in neurons. Transcripts of all three genes were up-regulated by depolarizing KCl stimulation and down-regulated by the impulse blocker tetrodotoxin (TTX), indicating that their expression was activity-dependent. Silencing of Sp4 blocked the up-regulation of these genes induced by KCl, whereas over-expression of Sp4 rescued them from TTX-induced suppression. The effect of silencing or over-expressing Sp4 on primary neurons was much greater than those of Sp1 or Sp3. The binding sites of Sp factors on these genes are conserved among mice, rats and humans. Thus, Sp4 plays an important role in the transcriptional coupling of energy generation and energy consumption in neurons.
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Affiliation(s)
- Kaid Johar
- Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI, 53226, USA
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Johar K, Priya A, Dhar S, Liu Q, Wong-Riley MTT. Neuron-specific specificity protein 4 bigenomically regulates the transcription of all mitochondria- and nucleus-encoded cytochrome c oxidase subunit genes in neurons. J Neurochem 2013; 127:496-508. [PMID: 24032355 DOI: 10.1111/jnc.12433] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [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: 08/08/2013] [Revised: 08/20/2013] [Accepted: 08/21/2013] [Indexed: 12/20/2022]
Abstract
Neurons are highly dependent on oxidative metabolism for their energy supply, and cytochrome c oxidase (COX) is a key energy-generating enzyme in the mitochondria. A unique feature of COX is that it is one of only four proteins in mammalian cells that are bigenomically regulated. Of its thirteen subunits, three are encoded in the mitochondrial genome and ten are nuclear-encoded on nine different chromosomes. The mechanism of regulating this multisubunit, bigenomic enzyme poses a distinct challenge. In recent years, we found that nuclear respiratory factors 1 and 2 (NRF-1 and NRF-2) mediate such bigenomic coordination. The latest candidate is the specificity factor (Sp) family of proteins. In N2a cells, we found that Sp1 regulates all 13 COX subunits. However, we discovered recently that in primary neurons, it is Sp4 and not Sp1 that regulates some of the key glutamatergic receptor subunit genes. The question naturally arises as to the role of Sp4 in regulating COX in primary neurons. The present study utilized multiple approaches, including chromatin immunoprecipitation, promoter mutational analysis, knockdown and over-expression of Sp4, as well as functional assays to document that Sp4 indeed functionally regulate all 13 subunits of COX as well as mitochondrial transcription factors A and B. The present study discovered that among the specificity family of transcription factors, it is the less known neuron-specific Sp4 that regulates the expression of all 13 subunits of mitochondrial cytochrome c oxidase (COX) enzyme in primary neurons. Sp4 also regulates the three mitochondrial transcription factors (TFAM, TFB1M, and TFB2M) and a COX assembly protein SURF-1 in primary neurons.
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Affiliation(s)
- Kaid Johar
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
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Priya A, Johar K, Wong-Riley MTT. Specificity protein 4 functionally regulates the transcription of NMDA receptor subunits GluN1, GluN2A, and GluN2B. Biochim Biophys Acta 2013; 1833:2745-2756. [PMID: 23871830 DOI: 10.1016/j.bbamcr.2013.07.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Revised: 07/03/2013] [Accepted: 07/08/2013] [Indexed: 10/26/2022]
Abstract
N-Methyl-d-aspartate (NMDA) receptors are major glutamatergic receptors involved in most excitatory neurotransmission in the brain. The transcriptional regulation of NMDA receptors is not fully understood. Previously, we found that the GluN1 and GluN2B subunits of the NMDA receptor are regulated by nuclear respiratory factors 1 and 2 (NRF-1 and NRF-2). NRF-1 and NRF-2 also regulate all 13 subunits of cytochrome c oxidase (COX), a critical energy-generating enzyme, thereby coupling neuronal activity and energy metabolism at the transcriptional level. Specificity protein (Sp) is a family of transcription factors that bind to GC-rich regions, with Sp1, Sp3, and Sp4 all binding to the same cis- motifs. Sp1 and Sp3 are ubiquitously expressed, whereas Sp4 expression is restricted to neurons and testicular cells. Recently, we found that the Sp1 factor regulates all subunits of COX. The goal of the present study was to test our hypothesis that the Sp factors also regulate specific subunits of NMDA receptors, and that they function with NRF-1 and NRF-2 via one of three mechanisms: complementary, concurrent and parallel, or a combination of complementary and concurrent/parallel. By means of multiple approaches we found that Sp4 functionally regulated GluN1, GluN2A, and GluN2B, but not GluN2C. On the other hand, Sp1 and Sp3 did not regulate these subunits as previously thought. Our data suggest that Sp4 operates in a complementary and concurrent/parallel manner with NRF-1 and NRF-2 to mediate the tight coupling between energy metabolism and neuronal activity at the molecular level.
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Affiliation(s)
- Anusha Priya
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Kaid Johar
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA
| | - Margaret T T Wong-Riley
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA.
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Vasavada AR, Johar K, Praveen MR, Vasavada VA, Arora AI. Histomorphological and immunofluorescence evaluation of clear corneal incisions after microcoaxial phacoemulsification with 2.2 mm and 1.8 mm systems. J Cataract Refract Surg 2013; 39:617-23. [DOI: 10.1016/j.jcrs.2012.12.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Revised: 12/12/2012] [Accepted: 12/12/2012] [Indexed: 11/16/2022]
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Dhar SS, Johar K, Wong-Riley MTT. Bigenomic transcriptional regulation of all thirteen cytochrome c oxidase subunit genes by specificity protein 1. Open Biol 2013; 3:120176. [PMID: 23516108 PMCID: PMC3718336 DOI: 10.1098/rsob.120176] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [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] [Indexed: 11/12/2022] Open
Abstract
Cytochrome c oxidase (COX) is one of only four known bigenomic proteins, with three mitochondria-encoded subunits and 10 nucleus-encoded ones derived from nine different chromosomes. The mechanism of regulating this multi-subunit, bigenomic enzyme is not fully understood. We hypothesize that specificity protein 1 (Sp1) functionally regulates the 10 nucleus-encoded COX subunit genes directly and the three mitochondrial COX subunit genes indirectly by regulating mitochondrial transcription factors A and B (TFAM, TFB1M and TFB2M) in neurons. By means of in silico analysis, electrophoretic mobility shift and supershift assays, chromatin immunoprecipitation, RNA interference and over-expression experiments, the present study documents that Sp1 is a critical regulator of all 13 COX subunit genes in neurons. This regulation is intimately associated with neuronal activity. Silencing of Sp1 prevented the upregulation of all COX subunits by KCl, and over-expressing Sp1 rescued all COX subunits from being downregulated by tetrodotoxin. Thus, Sp1 and our previously described nuclear respiratory factors 1 and 2 are the three key regulators of all 13 COX subunit genes in neurons. The binding sites for Sp1 on all 10 nucleus-encoded COX subunits, TFAM, TFB1M and TFB2M are highly conserved among mice, rats and humans.
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Affiliation(s)
- Shilpa S Dhar
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, Milwaukee, WI 53226, USA
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Wilkins S, Zhang KW, Mahfuz I, Quantin R, D'Cruz N, Hutson J, Ee M, Bagli D, Aitken K, Fong FNY, Ng PKS, Tsui SKW, Fung WYW, Banu T, Thakre A, Johar K, Jaureguizar E, Li L, Cheng W. Insertion/deletion polymorphisms in the ΔNp63 promoter are a risk factor for bladder exstrophy epispadias complex. PLoS Genet 2012; 8:e1003070. [PMID: 23284286 PMCID: PMC3527294 DOI: 10.1371/journal.pgen.1003070] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2011] [Accepted: 09/21/2012] [Indexed: 11/23/2022] Open
Abstract
Bladder exstrophy epispadias complex (BEEC) is a severe congenital anomaly; however, the genetic and molecular mechanisms underlying the formation of BEEC remain unclear. TP63, a member of TP53 tumor suppressor gene family, is expressed in bladder urothelium and skin over the external genitalia during mammalian development. It plays a role in bladder development. We have previously shown that p63−/− mouse embryos developed a bladder exstrophy phenotype identical to human BEEC. We hypothesised that TP63 is involved in human BEEC pathogenesis. RNA was extracted from BEEC foreskin specimens and, as in mice, ΔNp63 was the predominant p63 isoform. ΔNp63 expression in the foreskin and bladder epithelium of BEEC patients was reduced. DNA was sequenced from 163 BEEC patients and 285 ethnicity-matched controls. No exon mutations were detected. Sequencing of the ΔNp63 promoter showed 7 single nucleotide polymorphisms and 4 insertion/deletion (indel) polymorphisms. Indel polymorphisms were associated with an increased risk of BEEC. Significantly the sites of indel polymorphisms differed between Caucasian and non-Caucasian populations. A 12-base-pair deletion was associated with an increased risk with only Caucasian patients (p = 0.0052 Odds Ratio (OR) = 18.33), whereas a 4-base-pair insertion was only associated with non-Caucasian patients (p = 0.0259 OR = 4.583). We found a consistent and statistically significant reduction in transcriptional efficiencies of the promoter sequences containing indel polymorphisms in luciferase assays. These findings suggest that indel polymorphisms of the ΔNp63 promoter lead to a reduction in p63 expression, which could lead to BEEC. Bladder exstrophy epispadias complex is a severe congenital abnormality. The affected babies' bladders are born open, leaking urine constantly. Treatment involves multiple major reconstructive surgeries and the need for lifelong care for the complications of the disease. Although a number of studies have suggested a genetic cause of the disease, the genetic and molecular mechanism underlying the formation of BEEC remains unknown. One gene, TP63, plays a crucial role in the early bladder development. Two different genetic promoters of TP63 produce different forms of the protein with opposing properties. We have shown mice lacking p63 displayed a deformity complex identical to human BEEC. There are no genetic mutations in the p63 protein in BEEC, so genetic variants in the promoter could alter protein expression. Our hypothesis was that loss of p63 expression due to sequence polymorphisms in a promoter is a risk factor for BEEC. We found promoter sequence variants that were statistically associated with the disease and the sequence variant location varied between Caucasian and non-Caucasian patients. This is particularly important as Caucasian populations have a higher risk of BEEC. These findings provide an explanation of BECC and a base for further study of TP63 related genes in this disease.
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Affiliation(s)
- Simon Wilkins
- Monash Institute of Medical Research, Faculty of Medicine, Nursing, and Health Sciences, Monash University, Melbourne, Australia
- * E-mail: (SW); (WC)
| | - Ke Wei Zhang
- Monash Institute of Medical Research, Faculty of Medicine, Nursing, and Health Sciences, Monash University, Melbourne, Australia
| | - Istiak Mahfuz
- Monash Institute of Medical Research, Faculty of Medicine, Nursing, and Health Sciences, Monash University, Melbourne, Australia
| | - Renaud Quantin
- Monash Institute of Medical Research, Faculty of Medicine, Nursing, and Health Sciences, Monash University, Melbourne, Australia
| | - Nancy D'Cruz
- Monash Institute of Medical Research, Faculty of Medicine, Nursing, and Health Sciences, Monash University, Melbourne, Australia
| | - John Hutson
- Department of Paediatric Urology, University of Melbourne, Melbourne, Australia
| | - Michael Ee
- Women's and Children's Clinical Services, Royal Hobart Hospital, Hobart, Australia
| | - Darius Bagli
- Division of Urology, Hospital for Sick Children and University of Toronto, Toronto, Canada
| | - Karen Aitken
- Division of Urology, Hospital for Sick Children and University of Toronto, Toronto, Canada
| | - Fion Nga-Yin Fong
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, China
| | - Patrick Kwok-Shing Ng
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, China
| | | | - Wendy Yin-Wan Fung
- School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong, China
| | - Tahmina Banu
- Department of Pediatric Surgery, Chittagong Medical College and Hospital, Chittagong, Bangladesh
| | - Atul Thakre
- Iladevi Cataract and Intraocular Lens Research Centre, Civil Hospital, Ahmedabad, India
| | - Kaid Johar
- Iladevi Cataract and Intraocular Lens Research Centre, Civil Hospital, Ahmedabad, India
| | | | - Long Li
- Department of Surgery, Capital Institute of Pediatrics, Beijing, China
| | - Wei Cheng
- Monash Institute of Medical Research, Faculty of Medicine, Nursing, and Health Sciences, Monash University, Melbourne, Australia
- Department of Paediatrics, Department of Surgery, Southern Medical School, Faculty of Medicine, Nursing, and Health Sciences, Monash University, Melbourne, Australia
- Department of Paediatric Surgery, Monash Children's, Southern Health, Melbourne, Australia
- * E-mail: (SW); (WC)
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Priya A, Johar K, Wong-Riley MTT. Nuclear respiratory factor 2 regulates the expression of the same NMDA receptor subunit genes as NRF-1: both factors act by a concurrent and parallel mechanism to couple energy metabolism and synaptic transmission. Biochim Biophys Acta 2012; 1833:48-58. [PMID: 23085505 DOI: 10.1016/j.bbamcr.2012.10.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Revised: 10/13/2012] [Accepted: 10/14/2012] [Indexed: 11/19/2022]
Abstract
Neuronal activity and energy metabolism are tightly coupled processes. Previously, we found that nuclear respiratory factor 1 (NRF-1) transcriptionally co-regulates energy metabolism and neuronal activity by regulating all 13 subunits of the critical energy generating enzyme, cytochrome c oxidase (COX), as well as N-methyl-d-aspartate (NMDA) receptor subunits 1 and 2B, GluN1 (Grin1) and GluN2B (Grin2b). We also found that another transcription factor, nuclear respiratory factor 2 (NRF-2 or GA-binding protein) regulates all subunits of COX as well. The goal of the present study was to test our hypothesis that NRF-2 also regulates specific subunits of NMDA receptors, and that it functions with NRF-1 via one of three mechanisms: complementary, concurrent and parallel, or a combination of complementary and concurrent/parallel. By means of multiple approaches, including in silico analysis, electrophoretic mobility shift and supershift assays, in vivo chromatin immunoprecipitation of mouse neuroblastoma cells and rat visual cortical tissue, promoter mutations, real-time quantitative PCR, and western blot analysis, NRF-2 was found to functionally regulate Grin1 and Grin2b genes, but not any other NMDA subunit genes. Grin1 and Grin2b transcripts were up-regulated by depolarizing KCl, but silencing of NRF-2 prevented this up-regulation. On the other hand, over-expression of NRF-2 rescued the down-regulation of these subunits by the impulse blocker TTX. NRF-2 binding sites on Grin1 and Grin2b are conserved among species. Our data indicate that NRF-2 and NRF-1 operate in a concurrent and parallel manner in mediating the tight coupling between energy metabolism and neuronal activity at the molecular level.
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Affiliation(s)
- Anusha Priya
- Department of Cell Biology, Medical College of Wisconsin, Milwaukee, WI 53226, USA
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Johar K, Priya A, Wong-Riley MTT. Regulation of Na(+)/K(+)-ATPase by nuclear respiratory factor 1: implication in the tight coupling of neuronal activity, energy generation, and energy consumption. J Biol Chem 2012; 287:40381-90. [PMID: 23048038 DOI: 10.1074/jbc.m112.414573] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND NRF-1 regulates mediators of neuronal activity and energy generation. RESULTS NRF-1 transcriptionally regulates Na(+)/K(+)-ATPase subunits α1 and β1. CONCLUSION NRF-1 functionally regulates mediators of energy consumption in neurons. SIGNIFICANCE NRF-1 mediates the tight coupling of neuronal activity, energy generation, and energy consumption at the molecular level. Energy generation and energy consumption are tightly coupled to neuronal activity at the cellular level. Na(+)/K(+)-ATPase, a major energy-consuming enzyme, is well expressed in neurons rich in cytochrome c oxidase, an important enzyme of the energy-generating machinery, and glutamatergic receptors that are mediators of neuronal activity. The present study sought to test our hypothesis that the coupling extends to the molecular level, whereby Na(+)/K(+)-ATPase subunits are regulated by the same transcription factor, nuclear respiratory factor 1 (NRF-1), found recently by our laboratory to regulate all cytochrome c oxidase subunit genes and some NMDA and AMPA receptor subunit genes. By means of multiple approaches, including in silico analysis, electrophoretic mobility shift and supershift assays, in vivo chromatin immunoprecipitation, promoter mutational analysis, and real-time quantitative PCR, NRF-1 was found to functionally bind to the promoters of Atp1a1 and Atp1b1 genes but not of the Atp1a3 gene in neurons. The transcripts of Atp1a1 and Atp1b1 subunit genes were up-regulated by KCl and down-regulated by tetrodotoxin. Atp1b1 is positively regulated by NRF-1, and silencing of NRF-1 with small interference RNA blocked the up-regulation of Atp1b1 induced by KCl, whereas overexpression of NRF-1 rescued these transcripts from being suppressed by tetrodotoxin. On the other hand, Atp1a1 is negatively regulated by NRF-1. The binding sites of NRF-1 on Atp1a1 and Atp1b1 are conserved among mice, rats, and humans. Thus, NRF-1 regulates key Na(+)/K(+)-ATPase subunits and plays an important role in mediating the tight coupling between energy consumption, energy generation, and neuronal activity at the molecular level.
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Affiliation(s)
- Kaid Johar
- Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, WI 53226, USA
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Praveen MR, Shah GD, Vasavada AR, Shah AR, Johar K, Gami Y, Diwan RP, Shah SM. Posterior capsule opacification in eyes with steroid-induced cataracts: Comparison of early results. J Cataract Refract Surg 2011; 37:88-96. [PMID: 21183104 DOI: 10.1016/j.jcrs.2010.08.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2010] [Revised: 07/30/2010] [Accepted: 08/05/2010] [Indexed: 11/15/2022]
Abstract
PURPOSE To evaluate posterior capsule opacification (PCO) development after cataract surgery in eyes with or without a history of steroid use. SETTING Iladevi Cataract & IOL Research Centre, Ahmedabad, India. DESIGN Comparative case series. METHODS This study comprised consecutive patients with a history of steroid intake (oral, inhaled, injectable, or topical) for at least 4 months who developed posterior subcapsular cataract (PSC) (study group) and patients without a history of steroid intake with uncomplicated PSC (control group). Standardized surgery was performed in both groups. Digital retroillumination photographic documentation was performed 1 month and 1 year postoperatively. The digital images were analyzed for PCO using Evaluation of Posterior Capsule Opacification (EPCO) software; the entire intraocular lens (IOL) optic and the central 3.0 mm optic area were evaluated. The EPCO score and EPCO area were determined. RESULTS One year postoperatively, the mean EPCO score was statistically significantly higher in the study group (n = 30) than in the control group (n = 60) (0.33 ± 0.37 [SD] versus 0.15 ± 0.26), as was the mean EPCO area (0.323 ± 0.36 versus 0.15 ± 0.26) (both P<.04). Within the central 3.0 mm optic area, the mean EPCO scores (0.149 ± 0.309 versus 0.003 ± 0.016 P<.04) and mean EPCO area values (0.149 ± 0.309 versus 0.003 ± 0.016) were statistically significantly higher in the study group (P<.04). CONCLUSION Steroid-induced PSC was associated with a higher risk for PCO after cataract surgery at the 1-year follow-up. FINANCIAL DISCLOSURE No author has a financial or proprietary interest in any material or method mentioned.
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Affiliation(s)
- Mamidipudi R Praveen
- Iladevi Cataract & IOL Research Center, Raghudeep Eye Clinic, Gurukul Road, Memnagar, Ahmedabad, India
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Gajjar D, Jozwiak A, Swiezewska E, Alapure B, Parmar T, Johar K, Vasavada AR. Quantification of dolichol in the human lens with different types of cataracts. Mol Vis 2009; 15:1573-9. [PMID: 19693292 PMCID: PMC2728568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2009] [Accepted: 08/07/2009] [Indexed: 10/26/2022] Open
Abstract
PURPOSE To quantify and characterize dolichol species in cataractous and clear human lenses. METHODS Whole lenses were collected from cadaver eyeballs from the C.H. Nagri Eye Bank and Red Cross Society Eye Bank (Ahmedabad, India). Cataractous nuclei were collected after extracapsular cataract extraction (ECCE). Wet weight for all the lenses was taken and were stored at -50 degrees C until used. Dolichol was extracted using a standard protocol and then analyzed using High Performance Liquid Chromatography (HPLC) on a 4.6 mmx60 mm Hypersil-Octadecylsilane (ODS; 3 microm) reversed phase column using a Waters dual pump apparatus, a Waters gradient programmer, and an ultraviolet (UV) detector set at 210 nm. Dolichol 13 was used as an internal standard, and dolichol mixture from the liver was used as an external qualitative standard. RESULTS The highest dolichol concentration was found in nuclear cataract (2.54+/-0.6 microg) followed by posterior subcapsular cataract (1.4+/-0.35 microg), and the lowest levels were observed in cortical cataract (0.37+/-0.06 microg). The level of dolichol concentration in cataractous lenses was statistically significantly higher than the levels in clear lenses (1.0+/-04.3 microg; p<0.01). CONCLUSIONS The dolichol concentration was significantly higher in lenses with nuclear cataract. A significant difference in dolichol concentration was observed between the different types of cataract. It suggests that dolichol and other isoprenoids may be associated with cataractogenesis.
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Affiliation(s)
| | - Adam Jozwiak
- Department of Lipid Biochemistry, Polish Academy of Sciences, Warsaw, Poland
| | - Ewa Swiezewska
- Department of Lipid Biochemistry, Polish Academy of Sciences, Warsaw, Poland
| | | | - Trilok Parmar
- Iladevi Cataract and IOL Research Centre, Ahmedabad, India
| | - Kaid Johar
- Iladevi Cataract and IOL Research Centre, Ahmedabad, India
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Alapure BV, Praveen MR, Gajjar D, Vasavada AR, Rajkumar S, Johar K. Matrix metalloproteinase-9 activity in human lens epithelial cells of cortical, posterior subcapsular, and nuclear cataracts. J Cataract Refract Surg 2008; 34:2063-7. [DOI: 10.1016/j.jcrs.2008.08.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2008] [Accepted: 08/11/2008] [Indexed: 10/21/2022]
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Gajjar D, Patel D, Alapure B, Praveen MR, Patel A, Johar K, Vasavada AR. Rapid action of oestradiol against hydrogen peroxide-induced oxidative stress in cataractous lens epithelium: an in vitro study. Eye (Lond) 2008; 23:1456-63. [DOI: 10.1038/eye.2008.284] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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Gajjar D, Praveen MR, Vasavada AR, Pandita D, Vasavada VA, Patel DB, Johar K, Raj S. Ingress of bacterial inoculum into the anterior chamber after bimanual and microcoaxial phacoemulsification in rabbits. J Cataract Refract Surg 2007; 33:2129-34. [DOI: 10.1016/j.jcrs.2007.07.043] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2007] [Accepted: 07/16/2007] [Indexed: 10/22/2022]
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Vasavada AR, Praveeni MR, Pandita D, Gajjar DU, Vasavada VA, Vasavada VA, Raj SM, Johar K. Reply : Effect of stromal hydration on clear corneal incisions. J Cataract Refract Surg 2007. [DOI: 10.1016/j.jcrs.2007.05.049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Johar K, Vasavada AR, Tatsumi K, Dholakia S, Nihalani B, Rao SSL. Anterior Capsular Plaque in Congenital Cataract: Occurrence, Morphology, Immunofluorescence, and Ultrastructure. ACTA ACUST UNITED AC 2007; 48:4209-14. [PMID: 17724208 DOI: 10.1167/iovs.07-0312] [Citation(s) in RCA: 13] [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: 11/24/2022]
Abstract
PURPOSE To study occurrence, morphology, immunofluorescence, and ultrastructural features of congenital anterior capsular plaque (ACP) obtained from pediatric eyes undergoing cataract surgery. METHODS Two hundred sixty consecutive pediatric eyes undergoing congenital cataract surgery were enrolled in the present study. Anterior lens epithelium from cataract without ACP and with ACP was collected. Wholemounts of lens epithelium were stained with hematoxylin-eosin. Five-micrometer-thick sections of large ACPs were subjected to immunofluorescence localization of collagen type I, collagen type IV, alpha-smooth muscle actin (alpha SMA), and alpha A-crystallin. Ultrathin sections were studied by transmission electron microscope. RESULTS The overall occurrence of ACP in pediatric eyes undergoing congenital cataract surgery was 11.5%. The occurrence of ACP was highest in mature cataract followed by nuclear, lamellar, and mixed cataract. The wholemount of anterior lens epithelium revealed nonplaque and plaque region or ACP. Depending on the area, ACPs can be classified as small, medium, and large. The extracellular matrix of ACP was fibrous and amorphous. It was rich in collagen type I. The cells of the ACP were surrounded by a network of collagen type IV and were positive for alpha SMA and alpha A-crystallin. The cells of the ACP were rich in rough endoplasmic reticulum and mitochondria. CONCLUSIONS The occurrence of ACP in pediatric eyes undergoing cataract surgery for congenital cataract was 11.5%. ACP was more associated with mature cataract. Epithelial mesenchymal transdifferentiation of lens epithelial cells may be involved in the development of congenital ACP.
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Affiliation(s)
- Kaid Johar
- Iladevi Cataract and IOL Research Centre, Gujarat, India.
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Vasavada AR, Praveen MR, Pandita D, Gajjar DU, Vasavada VA, Vasavada VA, Raj SM, Johar K. Effect of stromal hydration of clear corneal incisions: Quantifying ingress of trypan blue into the anterior chamber after phacoemulsification. J Cataract Refract Surg 2007; 33:623-7. [PMID: 17397734 DOI: 10.1016/j.jcrs.2007.01.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2006] [Accepted: 01/02/2007] [Indexed: 10/23/2022]
Abstract
PURPOSE To use trypan blue as a quantifiable ingress tracer to determine whether stromal hydration reduces ocular surface fluid ingress at the end of phacoemulsification. SETTING Iladevi Cataract and IOL Research Centre, Memnagar, Ahmedabad, India. METHODS A prospective randomized study included 80 eyes having phacoemulsification through 2.2 mm incisions. These eyes were divided into 2 equal groups: 1 had stromal hydration (surgery completed by injecting fortified balanced salt solution [BSS Plus] to hydrate the lateral walls and internal entry of incision) and the other had no stromal hydration. One half milliliter of 0.0125% sterile trypan blue was instilled on the ocular surface and allowed to remain for 2 minutes. One-tenth milliliter of aqueous fluid was aspirated from the anterior chamber, and its optical density was measured using ultraviolet spectrophotometry. Logs of dilution of trypan blue were used for statistical analysis using the nonparametric Mann-Whitney U test. RESULTS There was a statistically significant decrease and difference between groups in mean dilution of trypan blue in the aqueous aspirate (P<.001). The mean was 1:11,337 in the stromal hydration group and 1:220 in the no stromal hydration group. Logs of mean dilution of trypan blue had statistically significant lower values in the stromal hydration group than in the no stromal hydration group (3.21 and 2.14, respectively) (P<.001). CONCLUSIONS Stromal hydration of clear corneal incisions reduced ingress into the anterior chamber of the trypan blue instilled on the ocular surface. Clinically, these findings may have a beneficial effect in reducing the risk for postoperative endophthalmitis.
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Affiliation(s)
- Abhay R Vasavada
- Iladevi Cataract and Intraocular Lens Research Centre, Raghudeep Eye Clinic, Memnagar, Ahmedabad, India.
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Nanavaty MA, Johar K, Sivasankaran MA, Vasavada AR, Praveen MR, Zetterström C. Effect of trypan blue staining on the density and viability of lens epithelial cells in white cataract. J Cataract Refract Surg 2006; 32:1483-8. [PMID: 16931259 DOI: 10.1016/j.jcrs.2006.04.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2005] [Accepted: 04/03/2006] [Indexed: 11/18/2022]
Abstract
PURPOSE To assess the effect of anterior capsule staining with trypan blue 0.0125% on the density and viability of the lens epithelial cells (LECs). SETTING Iladevi Cataract and IOL Research Center, Ahmedabad, India. METHODS This randomized prospective study comprised 40 eyes having phacoemulsification for white mature cataract. Patients were randomized to have the anterior capsule stained with 0.1 mL trypan blue 0.0125% solution before the anterior capsulorhexis (Group 1, n = 20) or to have no anterior capsule staining before the anterior capsulorhexis (Group 2, n = 20). The density and viability of LECs were analyzed. The first 20 samples (10 from Group 1, 10 from Group 2) were stained with hematoxylin-eosin for cell density analysis using image-analysis software. The remaining 20 samples (10 from each group) were stained with a solution containing 0.5 microM calcein AM and 5 microM propidium iodide for 10 minutes at 37 degrees C for viability assay. RESULTS The mean cell density in Group 1 (with staining) was 3533.15 cells/mm(2) +/- 664.01 (SD). This was significantly lower than the mean of 4235.59 +/- 414.93 cells/mm(2) in Group 2 (no staining) (P = .01). The mean capsule area covered with LECs (80.75% +/- 8.04% versus 94.63% +/- 3.78%) and the mean live LECs in the covered area (51.69% +/- 11.54% versus 68.67% +/- 9.15%) were also significantly lower in Group 1 (P = .002). CONCLUSION Staining the anterior capsule with trypan blue affected the density and viability of LECs.
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Affiliation(s)
- Mayank A Nanavaty
- Iladevi Cataract & IOL Research Centre, Raghudeep Eye Clinic, Ahmedabad, India
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Vasavada AR, Raj SM, Johar K, Nanavaty MA. Effect of hydrodissection alone and hydrodissection combined with rotation on lens epithelial cells. J Cataract Refract Surg 2006; 32:145-50. [PMID: 16516794 DOI: 10.1016/j.jcrs.2005.11.027] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2005] [Accepted: 06/04/2005] [Indexed: 11/29/2022]
Abstract
PURPOSE To evaluate the impact of corticocleaving hydrodissection alone and hydrodissection combined with rotation on lens epithelial cells (LECs) and residual cortical fibers (RCFs). SETTING Iladevi Cataract and IOL Research Center, Ahmedabad, India. METHODS An experimental laboratory study of 20 fresh human cadaver eyes (10 pairs) was conducted. A single eye from each pair was assigned to the control group, in which no hydrodissection and no rotation were performed (control). The other eye was randomized to corticocleaving hydrodissection alone (Group 1) or corticocleaving hydrodissection with rotation (Group 2). Cataract extraction was standardized. Capsule polishing was omitted. Area of LEC loss (%) in the preequatorial zone (PZ) and equatorial zone (EZ) was calculated as: [Area of capsule without cells/Total area of capsule] x 100. Area of presence of RCFs (%) was calculated as: [Circumference of EZ of capsule with RCF/Total circumference of EZ of the capsule] x 100. The Mann-Whitney U and the Wilcoxon signed rank tests were applied. RESULTS In the control group, area of cell loss (%) was 3.9 +/- 3.2 in the PZ and 2.7 +/- 0.8 in the EZ; presence of RCFs (%) was 83.8 +/- 1.7. Area of LEC loss (%) in Groups 1 and 2 was 24.8 +/- 4.5 and 42.6 +/- 5.4 (P = .008) in the PZ and 22.4 +/- 2.1 and 54 +/- 2.5 (P = .008) in the EZ, respectively. Area of presence of RCFs (%) in Groups 1 and 2 was 34.2 +/- 3.7 and 23.7 +/- 3.7 (P = .008), respectively. CONCLUSION Corticocleaving hydrodissection combined with rotation removed significant quantities of LECs and RCFs.
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Affiliation(s)
- Abhay R Vasavada
- Iladevi Cataract & IOL Research Centre, Raghudeep Eye Clinic, Memnagar, Ahmedabad, India.
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Abstract
Dissimilarities in ocular physiopathology exist between human males and females. These differences can be observed in the lacrimal and other eye-associated glands, the ocular surface, the crystalline lens, and the retinochoroid complexes. Literature on the subject revealed that because of sex steroid hormone (estrogen, progesterone, and androgen) actions, various physiological conditions, such as age, menstrual cycles, pregnancy, and menopause or andropause, where the hormone milieu changes, affect vision. Well-designed scientific studies are lacking on the subject, although such studies hold much potential value. This review analyzes the relatively new area of hormones and vision.
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Affiliation(s)
- P D Gupta
- Iladevi Cataract and IOL Research Centre, Gurukul Road, Memnagar, Ahmedabad, India
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Gupta PD, Johar K, Vasavada A. Causative and preventive action of calcium in cataracto-genesis. Acta Pharmacol Sin 2004; 25:1250-6. [PMID: 15456524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023] Open
Abstract
Calcium and Ca-dependent enzymes play specific role in the development of human cataracts. Entry of Ca2+ into the lens epithelial cells (LEC) is highly regulated by quantum of receptors. The Ca2+ level controls homeostasis and growth of entire lens. Intracellular overload of Ca2+ in the LEC trigger a series of events such as activation of Ca-dependent enzymes, irreversible breakdown of important structural proteins and cell death. Proper maintenance of Ca2+ levels by regulating activity of Ca-pumps and Ca-channels and inhibition of Ca-dependent enzymes can help in prevention of cataract. Induction of cell death in the LEC by increase in the intracellular Ca2+ may be utilized for the prevention of posterior capsular opacification.
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Affiliation(s)
- Purshottam Das Gupta
- Iladevi Cataract and IOL Research Centre, Gurukul Road, Memnagar, Ahmedabad 380052, India.
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