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Thoduvayil S, Weerakkody JS, Sundaram RVK, Topper M, Bera M, Coleman J, Li X, Mariappan M, Ramakrishnan S. Rapid Quantification of First and Second Phase Insulin Secretion Dynamics using an In vitro Platform for Improving Insulin Therapy. Cell Calcium 2023; 113:102766. [PMID: 37295201 PMCID: PMC10450995 DOI: 10.1016/j.ceca.2023.102766] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 06/01/2023] [Accepted: 06/02/2023] [Indexed: 06/12/2023]
Abstract
High-throughput quantification of the first- and second-phase insulin secretion dynamics is intractable with current methods. The fact that independent secretion phases play distinct roles in metabolism necessitates partitioning them separately and performing high-throughput compound screening to target them individually. We developed an insulin-nanoluc luciferase reporter system to dissect the molecular and cellular pathways involved in the separate phases of insulin secretion. We validated this method through genetic studies, including knockdown and overexpression, as well as small-molecule screening and their effects on insulin secretion. Furthermore, we demonstrated that the results of this method are well correlated with those of single-vesicle exocytosis experiments conducted on live cells, providing a quantitative reference for the approach. Thus, we have developed a robust methodology for screening small molecules and cellular pathways that target specific phases of insulin secretion, resulting in a better understanding of insulin secretion, which in turn will result in a more effective insulin therapy through the stimulation of endogenous glucose-stimulated insulin secretion.
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Affiliation(s)
- Sikha Thoduvayil
- Nanobiology Institute, Yale University School of Medicine, West Haven, CT, 06516 USA; Department of Pathology, Yale University School of Medicine, New Haven, CT, 06520 USA
| | - Jonathan S Weerakkody
- Nanobiology Institute, Yale University School of Medicine, West Haven, CT, 06516 USA; Department of Pathology, Yale University School of Medicine, New Haven, CT, 06520 USA
| | - Ramalingam Venkat Kalyana Sundaram
- Nanobiology Institute, Yale University School of Medicine, West Haven, CT, 06516 USA; Department of Cell Biology, Yale University School of Medicine, New Haven, CT, 06520 USA
| | - Mackenzie Topper
- Nanobiology Institute, Yale University School of Medicine, West Haven, CT, 06516 USA
| | - Manindra Bera
- Nanobiology Institute, Yale University School of Medicine, West Haven, CT, 06516 USA; Department of Cell Biology, Yale University School of Medicine, New Haven, CT, 06520 USA
| | - Jeff Coleman
- Nanobiology Institute, Yale University School of Medicine, West Haven, CT, 06516 USA; Department of Cell Biology, Yale University School of Medicine, New Haven, CT, 06520 USA
| | - Xia Li
- Nanobiology Institute, Yale University School of Medicine, West Haven, CT, 06516 USA; Department of Cell Biology, Yale University School of Medicine, New Haven, CT, 06520 USA
| | - Malaiyalam Mariappan
- Nanobiology Institute, Yale University School of Medicine, West Haven, CT, 06516 USA; Department of Cell Biology, Yale University School of Medicine, New Haven, CT, 06520 USA
| | - Sathish Ramakrishnan
- Nanobiology Institute, Yale University School of Medicine, West Haven, CT, 06516 USA; Department of Pathology, Yale University School of Medicine, New Haven, CT, 06520 USA.
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Thoduvayil S, Dhandapani G, Brahma R, Devasahayam Arokia Balaya R, Mangalaparthi KK, Patel K, Kumar M, Tennyson J, Satheeshkumar PK, Kulkarni MJ, Pinto SM, Prasad TSK, Madanan MG. Triton X-114 Fractionated Subcellular Proteome of Leptospira interrogans Shows Selective Enrichment of Pathogenic and Outer Membrane Proteins in the Detergent Fraction. Proteomics 2020; 20:e2000170. [PMID: 32846045 DOI: 10.1002/pmic.202000170] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [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: 06/26/2020] [Revised: 07/30/2020] [Indexed: 12/28/2022]
Abstract
The Triton X-114-based solubilization and temperature-dependent phase separation of proteins is used for subcellular fractionation where, aqueous, detergent, and pellet fractions represents cytoplasmic, outer membrane (OM), and inner membrane proteins, respectively. Mass spectrometry-based proteomic analysis of Triton X-114 fractions of proteomic analysis of Leptospira interrogans identified 2957 unique proteins distributed across the fractions. The results are compared with bioinformatics predictions on their subcellular localization and pathogenic nature. Analysis of the distribution of proteins across the Triton X-114 fractions with the predicted characteristics is performed based on "number" of unique type of proteins, and "quantity" which represents the amount of unique protein. The highest number of predicted outer membrane proteins (OMPs) and pathogenic proteins are found in aqueous and pellet fractions, whereas detergent fraction representing the OM has the highest quantity of OMPs and pathogenic proteins though lower in number than the aqueous and pellet fractions. This leaves the possibility of an upsurge in pathogenic proteins and OMPs on the OM under pathogenic conditions suggesting their potential use to combat leptospirosis. Further, the Triton X-114 subcellular fractions are more correlated to enrichment of pathogenic proteins predicted by MP3 software than predicted localization.
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Affiliation(s)
- Sikha Thoduvayil
- Indian Council of Medical Research, Regional Medical Research Centre Port Blair, Dollygunj, Port Blair, 744103, India.,Department of Pathology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, 605006, India
| | - Gunasekaran Dhandapani
- Indian Council of Medical Research, Regional Medical Research Centre Port Blair, Dollygunj, Port Blair, 744103, India.,Department of Chemical Sciences, Ariel University, Ariel, 70400, Israel
| | - Rahul Brahma
- Indian Council of Medical Research, Regional Medical Research Centre Port Blair, Dollygunj, Port Blair, 744103, India
| | - Rex Devasahayam Arokia Balaya
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangaluru, 575018, India
| | - Kiran K Mangalaparthi
- Institute of Bioinformatics, International Technology Park, Bengaluru, 560066, India.,NIMHANS-IOB Proteomics and Bioinformatics Laboratory, Neurobiology Research Centre, National Institute of Mental Health and Neurosciences, Bengaluru, 560029, India
| | - Krishna Patel
- Institute of Bioinformatics, International Technology Park, Bengaluru, 560066, India.,Amrita School of Biotechnology, Amrita Vishwa Vidyapeetham, Kollam, 690525, India
| | - Manish Kumar
- Institute of Bioinformatics, International Technology Park, Bengaluru, 560066, India.,Manipal Academy of Higher Education, Manipal, 576104, India
| | - Jebasingh Tennyson
- School of Biological Sciences, Madurai Kamaraj University, Madurai, 625021, India
| | - P K Satheeshkumar
- Department of Botany, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Mahesh J Kulkarni
- Biochemical Sciences Division, CSIR-National Chemical Laboratory, Pune, 411008, India
| | - Sneha M Pinto
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangaluru, 575018, India.,Institute of Bioinformatics, International Technology Park, Bengaluru, 560066, India
| | - T S Keshava Prasad
- Center for Systems Biology and Molecular Medicine, Yenepoya Research Centre, Yenepoya (Deemed to be University), Mangaluru, 575018, India.,Institute of Bioinformatics, International Technology Park, Bengaluru, 560066, India.,NIMHANS-IOB Proteomics and Bioinformatics Laboratory, Neurobiology Research Centre, National Institute of Mental Health and Neurosciences, Bengaluru, 560029, India
| | - Madathiparambil G Madanan
- Indian Council of Medical Research, Regional Medical Research Centre Port Blair, Dollygunj, Port Blair, 744103, India
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