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      Inhibition of Regulatory Volume Decrease Enhances the Cytocidal Effect of Hypotonic Shock in Hepatocellular Carcinoma

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          Abstract

          Background : Hypotonic shock induces cytocidal effects through cell rupture, and cancer therapy based on this mechanism has been clinically administered to hepatocellular carcinoma patients. We herein investigated the effectiveness of hypotonic shock combined with the inhibition of regulatory volume decrease as cancer therapy for hepatocellular carcinoma.

          Methods : Morphological changes in human hepatocellular carcinoma cell lines were observed under a differential interference contrast microscope connected to a high-speed digital video camera. Cell volume changes under hypotonic shock with or without chloride, potassium, or water channel blockers were observed using a high-resolution flow cytometer. In order to investigate cytocidal effects, the number of surviving cells was compared after exposure to hypotonic solution with and without each channel blocker (re-incubation experiment).

          Results : Video recordings showed that cells exposed to distilled water rapidly swelled and then ruptured. Cell volume measurements revealed regulatory volume decrease under mild hypotonic shock, whereas severe hypotonic shock increased the number of broken fragments as a result of cell rupture. Moreover, regulatory volume decrease was inhibited in cells treated with each channel blocker. Re-incubation experiments showed the cytocidal effects of hypotonic shock in cells exposed to hypotonic solution, and additional treatments with each channel blocker enhanced these effects.

          Conclusion : The inhibition of regulatory volume decrease with chloride, potassium, or water channel blockers may enhance the cytocidal effects of hypotonic shock in hepatocellular carcinoma. Hypotonic shock combined with the inhibition of regulatory volume decrease was a more effective therapy than hypotonic shock alone.

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          Physiology of cell volume regulation in vertebrates.

          Else K. Hoffmann, Ian H. Lambert, Stine F. Pedersen (2009)
          The ability to control cell volume is pivotal for cell function. Cell volume perturbation elicits a wide array of signaling events, leading to protective (e.g., cytoskeletal rearrangement) and adaptive (e.g., altered expression of osmolyte transporters and heat shock proteins) measures and, in most cases, activation of volume regulatory osmolyte transport. After acute swelling, cell volume is regulated by the process of regulatory volume decrease (RVD), which involves the activation of KCl cotransport and of channels mediating K(+), Cl(-), and taurine efflux. Conversely, after acute shrinkage, cell volume is regulated by the process of regulatory volume increase (RVI), which is mediated primarily by Na(+)/H(+) exchange, Na(+)-K(+)-2Cl(-) cotransport, and Na(+) channels. Here, we review in detail the current knowledge regarding the molecular identity of these transport pathways and their regulation by, e.g., membrane deformation, ionic strength, Ca(2+), protein kinases and phosphatases, cytoskeletal elements, GTP binding proteins, lipid mediators, and reactive oxygen species, upon changes in cell volume. We also discuss the nature of the upstream elements in volume sensing in vertebrate organisms. Importantly, cell volume impacts on a wide array of physiological processes, including transepithelial transport; cell migration, proliferation, and death; and changes in cell volume function as specific signals regulating these processes. A discussion of this issue concludes the review.
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            Hepatocellular carcinoma.

            Josep Llovet, Andrew Burroughs, Jordi Bruix (2003)
            Hepatocellular carcinoma (HCC) is the fifth most common cause of cancer, and its incidence is increasing worldwide because of the dissemination of hepatitis B and C virus infection. Patients with cirrhosis are at the highest risk and should be monitored every 6 months. Surveillance can lead to diagnosis at early stages, when the tumour might be curable by resection, liver transplantation, or percutaneous treatment. In the West and Japan, these treatments can be applied to 30% of patients, and result in 5-year survival rates higher than 50%. Resection is indicated among patients who have one tumour and well-preserved liver function. Liver transplantation benefits patients who have decompensated cirrhosis and one tumour smaller than 5 cm or three nodules smaller than 3 cm, but donor shortage greatly limits its applicability. This difficulty might be overcome by living donation. Most HCC patients are diagnosed at advanced stages and receive palliative treatments, which have been assessed in the setting of 63 randomised controlled trials during the past 25 years. Meta-analysis shows that only chemoembolisation improves survival in well-selected patients with unresectable HCC.
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              Cell surface area regulation and membrane tension.

              U Homann, John C. Morris (2001)
              The beautifully orchestrated regulation of cell shape and volume are central themes in cell biology and physiology. Though it is less well recognized, cell surface area regulation also constitutes a distinct task for cells. Maintaining an appropriate surface area is no automatic side effect of volume regulation or shape change. The issue of surface area regulation (SAR) would be moot if all cells resembled mammalian erythrocytes in being constrained to change shape and volume using existing surface membrane. But these enucleate cells are anomalies, possessing no endomembrane. Most cells use endomembrane to continually rework their plasma membrane, even while maintaining a given size or shape. This membrane traffic is intensively studied, generally with the emphasis on targeting and turnover of proteins and delivery of vesicle contents. But surface area (SA) homeostasis, including the controlled increase or decrease of SA, is another of the outcomes of trafficking. Our principal aims, then, are to highlight SAR as a discrete cellular task and to survey evidence for the idea that membrane tension is central to the task. Cells cannot directly "measure" their volume or SA, yet must regulate both. We posit that a homeostatic relationship exists between plasma membrane tension and plasma membrane area, which implies that cells detect and respond to deviations around a membrane tension set point. Maintenance of membrane strength during membrane turnover, a seldom-addressed aspect of SA dynamics, we examine in the context of SAR. SAR occurs in both animal and plant cells. The review shows the latter to be a continuing source of groundbreaking work on tension-sensitive SAR, but is principally slanted to animal cells.
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Cancer
                Journal ID (iso-abbrev): J Cancer
                Journal ID (publisher-id): jca
                Title: Journal of Cancer
                Publisher: Ivyspring International Publisher (Sydney )
                ISSN (Electronic): 1837-9664
                Publication date Collection: 2016
                Publication date (Electronic): 8 July 2016
                Volume: 7
                Issue: 11
                Pages: 1524-1533
                Affiliations
                1. Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, 602-8566, Japan;
                2. Departments of Molecular Cell Physiology and Bio-Ionomics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, 602-8566, Japan;
                3. Japan Institute for Food Education and Health, Heian Jogakuin (St. Agnes') University, Kyoto, 602-8013, Japan.
                Author notes
                ✉ Corresponding author: Dr. Atsushi Shiozaki, Assistant Professor, Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kamigyo-ku, Kyoto 602-8566, Japan. Tel.: +81 752515527, Fax: +81 752515522, e-mail: shiozaki@ 123456koto.kpu-m.ac.jp .

                * These authors contributed equally to this work.

                Competing Interests: The authors have declared that no competing interest exists.

                Article
                Publisher ID: jcav07p1524
                DOI: 10.7150/jca.15181
                PMC ID: 4964136
                PubMed ID: 27471568
                SO-VID: 4d722cc9-ff2e-4cdf-a6cf-0ad64ab0c500
                Copyright © © Ivyspring International Publisher. Reproduction is permitted for personal, noncommercial use, provided that the article is in whole, unmodified, and properly cited. See http://ivyspring.com/terms for terms and conditions.
                History
                Date received : 3 February 2016
                Date accepted : 4 June 2016
                Categories
                Subject: Research Paper

                ScienceOpen disciplines: Oncology & Radiotherapy
                Keywords: hepatocellular carcinoma,regulatory volume decrease,hypotonic shock,potassium ion transport,chloride ion transport.
                Data availability:
                ScienceOpen disciplines: Oncology & Radiotherapy
                Keywords: hepatocellular carcinoma, regulatory volume decrease, hypotonic shock, potassium ion transport, chloride ion transport.

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