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Sakata N, Yamaguchi Y, Chen Y, Shimoda M, Yoshimatsu G, Unno M, Sumi S, Ohki R. Pleckstrin homology-like domain family A, member 3 (PHLDA3) deficiency improves islets engraftment through the suppression of hypoxic damage. PLoS One 2017; 12:e0187927. [PMID: 29121094 PMCID: PMC5679611 DOI: 10.1371/journal.pone.0187927] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Accepted: 10/27/2017] [Indexed: 11/19/2022] Open
Abstract
Islet transplantation is a useful cell replacement therapy that can restore the glycometabolic function of severe diabetic patients. It is known that many transplanted islets failed to engraft, and thus, new approaches for overcoming graft loss that may improve the outcome of future clinical islet transplantations are necessary. Pleckstrin homology-like domain family A, member 3 (PHLDA3) is a known suppressor of neuroendocrine tumorigenicity, yet deficiency of this gene increases islet proliferation, prevents islet apoptosis, and improves their insulin-releasing function without causing tumors. In this study, we examined the potential use of PHLDA3-deficient islets in transplantation. We observed that: 1) transplanting PHLDA3-deficient islets into diabetic mice significantly improved their glycometabolic condition, 2) the improved engraftment of PHLDA3-deficient islets resulted from increased cell survival during early transplantation, and 3) Akt activity was elevated in PHLDA3-deficient islets, especially under hypoxic conditions. Thus, we determined that PHLDA3-deficient islets are more resistant against stresses induced by islet isolation and transplantation. We conclude that use of islets with suppressed PHLDA3 expression could be a novel and promising treatment for improving engraftment and consequent glycemic control in islet transplantation.
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Affiliation(s)
- Naoaki Sakata
- Department of Surgery, Tohoku University, Aoba-ku, Sendai, Miyagi, Japan
- * E-mail:
| | - Yohko Yamaguchi
- Divisions of Rare Cancer Research, National Cancer Center Research Institute, Tsukiji, Chuo-ku, Tokyo, Japan
| | - Yu Chen
- Divisions of Rare Cancer Research, National Cancer Center Research Institute, Tsukiji, Chuo-ku, Tokyo, Japan
| | - Masayuki Shimoda
- Department of Pancreatic Islet Cell Transplantation, Research Institute, National Center for Global Health and Medicine, Toyama, Shinjuku-ku, Tokyo, Japan
| | - Gumpei Yoshimatsu
- Department of Surgery, Tohoku University, Aoba-ku, Sendai, Miyagi, Japan
| | - Michiaki Unno
- Department of Surgery, Tohoku University, Aoba-ku, Sendai, Miyagi, Japan
| | - Shoichiro Sumi
- Department of Organ and Tissue Reconstruction, Institute for Frontier Life and Medical Sciences, Kyoto University, Shogoin, Sakyo-ku, Kyoto, Japan
| | - Rieko Ohki
- Divisions of Rare Cancer Research, National Cancer Center Research Institute, Tsukiji, Chuo-ku, Tokyo, Japan
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