Cell transplantation after oxidative hepatic preconditioning with radiation and ischemia-reperfusion leads to extensive liver repopulation.
The inability of transplanted cells to proliferate in the normal liver hampers cell therapy. We considered that oxidative hepatic DNA damage would impair the survival of native cells and promote proliferation in transplanted cells. Dipeptidyl peptidase-deficient F344 rats were preconditioned with whole liver radiation and warm ischemia-reperfusion followed by intrasplenic transplantation of syngeneic F344 rat hepatocytes. The preconditioning was well tolerated, although serum aminotransferase levels rose transiently and hepatic injury was observed histologically, along with decreased catalase activity and 8-hydroxy adducts of guanine, indicating oxidative DNA damage. Transplanted cells did not proliferate in the liver over 3 months in control animals and animals preconditioned with ischemia-reperfusion alone. Animals treated with radiation alone showed some transplanted cell proliferation. In contrast, the liver of animals preconditioned with radiation plus ischemia-reperfusion was replaced virtually completely over 3 months. Transplanted cells integrated in the liver parenchyma and liver architecture were preserved normally. These findings offer a paradigm for repopulating the liver with transplanted cells. Progressive loss of cells experiencing oxidative DNA damage after radiation and ischemia-reperfusion injury could be of significance for epithelial renewal in additional organs.
Malhi
Harmeet
H
Marion Bessin Liver Research Center, Departments of Medicine, Radiation Oncology, and Pathology, Comprehensive Cancer Research Center, and General Clinical Research Center, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
Gorla
Giridhar R
GR
Irani
Adil N
AN
Annamaneni
Pallavi
P
Gupta
Sanjeev
S
D000818:Animals; D017209:Apoptosis; D002467:Cell Nucleus / Q000473:pathology; D002478:Cells, Cultured; D004249:DNA Damage; D022781:Hepatocytes / Q000378:metabolism; D007150:Immunohistochemistry; D007511:Ischemia; D019194:Ischemic Preconditioning; D007700:Kinetics; D008099:Liver / Q000166:cytology* / Q000378:metabolism* / Q000473:pathology; D010100:Oxygen / Q000378:metabolism*; D051381:Rats; D011916:Rats, Inbred F344; D015427:Reperfusion Injury; D013997:Time Factors
D010100:Oxygen