Comparison of Purification Solutions With Different Osmolality for Porcine Islet Purification.
The osmolality of the purification solution is one of the most critical variables in human islet purification during islet isolation. We previously reported the effectiveness of a combined continuous density/osmolality gradient for the supplemental purification of human islets. We herein applied a combined continuous density/osmolality gradient for regular purification. The islets were purified with a continuous density gradient without osmolality preparation [continuous density/normal osmolality (CD/NO)] or continuous density/osmolality solution with osmolality preparation by 10× Hank's balanced salt solution (HBSS) [continuous density/continuous osmolality (CD/CO)]. The osmolality of the low-density solution was 400 mOsm/kg in both groups and that of the high-density solution was 410 mOsm/kg in the CD/NO group and 500 mOsm/kg in the CD/CO group. Unexpectedly, we noted no significant differences between the two solutions in terms of the islet yield, rate of viability and purity, score, stimulation index, or the attainability and suitability of posttransplantation normoglycemia. Despite reports that the endocrine and exocrine tissues of pancreata have distinct osmotic sensitivities and that high-osmolality solutions result in greater purification efficiency, the isolation and transplant outcomes did not markedly differ between the two purification solutions with different osmolalities in this study.
Department of Regenerative Medicine, Graduate School of Medicine, University of the Ryukyus , Okinawa , Japan.
Chika
C
Miyagi-Shiohira
† Okayama Saidaiji Hospital , Okayama , Japan.
Naoya
N
Kobayashi
‡ Division of Pediatric Dentistry, Graduate School of Medical and Dental Science, Niigata University , Niigata , Japan.
Issei
I
Saitoh
§ Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences , Okayama , Japan.
Masami
M
Watanabe
¶ Department of Socio-environmental Design, Hiroshima International University , Hiroshima , Japan.
Yasufumi
Y
Noguchi
# Department of Molecular and Cellular Physiology, Graduate School of Medicine, University of the Ryukyus , Okinawa , Japan.
Masayuki
M
Matsushita
Department of Regenerative Medicine, Graduate School of Medicine, University of the Ryukyus , Okinawa , Japan.
Hirofumi
H
Noguchi
Islet isolation; Islet purification; Islet transplantation; Osmolality