TY - JOUR
T1 - Immunoisolation effect of polyvinyl alcohol (PVA) macroencapsulated islets in type 1 diabetes therapy
AU - Qi, Zhi
AU - Yamamoto, Chizuru
AU - Imori, Naomi
AU - Kinukawa, Ayano
AU - Yang, Kai Chiang
AU - Yanai, Goichi
AU - Ikenoue, Etsuko
AU - Shen, Yanna
AU - Shirouzu, Yasumasa
AU - Hiura, Akihito
AU - Inoue, Kazutomo
AU - Sumi, Shoichiro
PY - 2012
Y1 - 2012
N2 - Islet transplantation has shown great success in the treatment of type 1 diabetes since the Edmonton protocol was established. However, it still has two major problems to overcome: the lack of organ donors and the side effects of immunosuppression. Encapsulated islets have emerged as a potential option for islet transplantation because it can, at least partly, overcome these two problems. Wistar rat islets suspended in 3% polyvinyl alcohol (PVA) hydrogel were frozen-thawed to make macroencapsulated islets (MEIs). The recovery rate, insulin content, and morphological change in culture medium with/without fresh human plasma (FHP) were measured in MEIs and free islets in vitro. In vivo, MEIs of either Wistar or Lewis rats were transplanted into the peritoneal cavity of streptozotocin (STZ)-induced diabetic Lewis rats and nonfasting blood glucose (NFBG), body weight, and histological evaluations were processed. FHP destroyed rat free islets but did not affect the islet morphology, islet recovery rate, or insulin content of rat MEIs. The transplantation of MEIs decreased the NFBG level and prevented body weight loss without a significant difference between the donor strains. Insulin-positive islets were observed in PVA MEIs 24 weeks after allotransplantation. These results suggest that PVA MEIs may be used as a cure for type 1 diabetes.
AB - Islet transplantation has shown great success in the treatment of type 1 diabetes since the Edmonton protocol was established. However, it still has two major problems to overcome: the lack of organ donors and the side effects of immunosuppression. Encapsulated islets have emerged as a potential option for islet transplantation because it can, at least partly, overcome these two problems. Wistar rat islets suspended in 3% polyvinyl alcohol (PVA) hydrogel were frozen-thawed to make macroencapsulated islets (MEIs). The recovery rate, insulin content, and morphological change in culture medium with/without fresh human plasma (FHP) were measured in MEIs and free islets in vitro. In vivo, MEIs of either Wistar or Lewis rats were transplanted into the peritoneal cavity of streptozotocin (STZ)-induced diabetic Lewis rats and nonfasting blood glucose (NFBG), body weight, and histological evaluations were processed. FHP destroyed rat free islets but did not affect the islet morphology, islet recovery rate, or insulin content of rat MEIs. The transplantation of MEIs decreased the NFBG level and prevented body weight loss without a significant difference between the donor strains. Insulin-positive islets were observed in PVA MEIs 24 weeks after allotransplantation. These results suggest that PVA MEIs may be used as a cure for type 1 diabetes.
KW - Islet transplantation
KW - Macroencapsulated islets
KW - Polyvinyl alcohol (PVA)
KW - Type 1 diabetes
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UR - http://www.scopus.com/inward/citedby.url?scp=84859714046&partnerID=8YFLogxK
U2 - 10.3727/096368911X605448
DO - 10.3727/096368911X605448
M3 - Article
C2 - 22793061
AN - SCOPUS:84859714046
SN - 0963-6897
VL - 21
SP - 525
EP - 534
JO - Cell Transplantation
JF - Cell Transplantation
IS - 2-3
ER -
