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Cotransplantation With Adipose Tissue-derived Stem Cells Improves Engraftment of Transplanted Hepatocytes. Transplantation 2022; 106:1963-1973. [PMID: 35404871 PMCID: PMC9521584 DOI: 10.1097/tp.0000000000004130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Hepatocyte transplantation is expected to be an alternative therapy to liver transplantation; however, poor engraftment is a severe obstacle to be overcome. The adipose tissue-derived stem cells (ADSCs) are known to improve engraftment of transplanted pancreatic islets, which have many similarities to the hepatocytes. Therefore, we examined the effects and underlying mechanisms of ADSC cotransplantation on hepatocyte engraftment. METHODS Hepatocytes and ADSCs were cotransplanted into the renal subcapsular space and livers of syngeneic analbuminemic rats, and the serum albumin level was quantified to evaluate engraftment. Immunohistochemical staining and fluorescent staining to trace transplanted cells in the liver were also performed. To investigate the mechanisms, cocultured supernatants were analyzed by a multiplex assay and inhibition test using neutralizing antibodies for target factors. RESULTS Hepatocyte engraftment at both transplant sites was significantly improved by ADSC cotransplantation ( P < 0.001, P < 0.001). In the renal subcapsular model, close proximity between hepatocytes and ADSCs was necessary to exert this effect. Unexpectedly, ≈50% of transplanted hepatocytes were attached by ADSCs in the liver. In an in vitro study, the hepatocyte function was significantly improved by ADSC coculture supernatant ( P < 0.001). The multiplex assay and inhibition test demonstrated that hepatocyte growth factor, vascular endothelial growth factor, and interleukin-6 may be key factors for the abovementioned effects of ADSCs. CONCLUSIONS The present study revealed that ADSC cotransplantation can improve the engraftment of transplanted hepatocytes. This effect may be based on crucial factors, such as hepatocyte growth factor, vascular endothelial growth factor, and interleukin-6, which are secreted by ADSCs.
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Matsumura M, Imura T, Inagaki A, Ogasawara H, Fukuoka K, Fathi I, Miyagi S, Ohashi K, Unno M, Kamei T, Satomi S, Goto M. A Simple and Useful Predictive Assay for Evaluating the Quality of Isolated Hepatocytes for Hepatocyte Transplantation. Sci Rep 2019; 9:6166. [PMID: 30992529 PMCID: PMC6467914 DOI: 10.1038/s41598-019-42720-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 04/08/2019] [Indexed: 12/13/2022] Open
Abstract
No optimal assay for assessing isolated hepatocytes before hepatocyte transplantation (HTx) has been established, therefore reliable and rapid assays are warranted. Isolated rat hepatocytes were dipped in a water bath (necrosis model), and were also cultured with Okadaic acid (apoptosis model) or vehicle, followed by cellular assessment including trypan blue exclusion (TBE) viability, ADP /ATP ratio, plating efficiency (PE), DNA quantity and ammonia elimination. Hepatocytes were transplanted into the liver of analbuminemic rats, subsequently engraftment was assessed by serum albumin and the histology of transplanted grafts. In the necrosis model, the ADP/ATP ratio was strongly and negatively correlated with the TBE (R2 = 0.559, P < 0.001). In the apoptosis model, the ADP/ATP ratio assay, PE, DNA quantification and an ammonia elimination test clearly distinguished the groups (P < 0.001, respectively). The ADP/ATP ratio, PE and DNA quantity were well-correlated and the ammonia elimination was slightly correlated with the transplant outcome. TBE could not distinguish the groups and was not correlated with the outcome. The ADP/ATP ratio assay predicted the transplant outcome. PE and DNA quantification may improve the accuracy of the retrospective (evaluations require several days) quality assessment of hepatocytes. The ADP/ATP ratio assay, alone or with a short-term metabolic assay could improve the efficiency of HTx.
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Affiliation(s)
- Muneyuki Matsumura
- Department of Surgery, Tohoku University Graduate School of Medicine, 980-0872, Sendai, Japan
| | - Takehiro Imura
- Division of Transplantation and Regenerative Medicine, Tohoku University School of Medicine, 980-0872, Sendai, Japan
| | - Akiko Inagaki
- Division of Transplantation and Regenerative Medicine, Tohoku University School of Medicine, 980-0872, Sendai, Japan
| | - Hiroyuki Ogasawara
- Department of Surgery, Tohoku University Graduate School of Medicine, 980-0872, Sendai, Japan
| | - Kengo Fukuoka
- Department of Surgery, Tohoku University Graduate School of Medicine, 980-0872, Sendai, Japan
| | - Ibrahim Fathi
- Division of Transplantation and Regenerative Medicine, Tohoku University School of Medicine, 980-0872, Sendai, Japan
| | - Shigehito Miyagi
- Department of Surgery, Tohoku University Graduate School of Medicine, 980-0872, Sendai, Japan
| | - Kazuo Ohashi
- Graduate School of Pharmaceutical Sciences, Osaka University, 565-0871, Osaka, Japan
| | - Michiaki Unno
- Department of Surgery, Tohoku University Graduate School of Medicine, 980-0872, Sendai, Japan
| | - Takashi Kamei
- Department of Surgery, Tohoku University Graduate School of Medicine, 980-0872, Sendai, Japan
| | - Susumu Satomi
- Department of Surgery, Tohoku University Graduate School of Medicine, 980-0872, Sendai, Japan
| | - Masafumi Goto
- Department of Surgery, Tohoku University Graduate School of Medicine, 980-0872, Sendai, Japan. .,Division of Transplantation and Regenerative Medicine, Tohoku University School of Medicine, 980-0872, Sendai, Japan.
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