Effect of complement activation in human serum on isolated porcine islets.

Abstract:

:We investigated the effect of the activation of complement in human serum on isolated adult porcine islets using an in vitro model of pig-to-human islet transplantation. Pancreata were obtained from slaughterhouse pigs (6-8 mo old). Islets were prepared by intraductal collagenase digestion followed by purification on Ficoll gradients. The purified islets were incubated with xenogeneic human serum with or without heat inactivation for 45 min. As control, islets were incubated with autologous porcine serum. After the incubation, the islets' responsiveness to an acute glucose stimulus (5.5 mM, static incubation) was evaluated by measurement of the insulin content of the medium. Islets exposed to human serum showed significantly lower insulin secretory response than the control (1.76 +/- 1.17 microU/islet/120 min, without heat inactivation; 1.74 +/- 1.36 microU/islet/120 min, with heat inactivation; 3.39 +/- 0.92 microU/islet/120 min, control). No difference in insulin secretory response, however, was observed between islets exposed to human serum with heat inactivation and without. Furthermore, we evaluated the cytotoxic activity of human serum on porcine islets by a complement-dependent cytotoxicity using the MTT colorimetric assay, and found that the human serum had no complement-dependent cytotoxic activity against the islets. We concluded that the insulin secretion dysfunction of porcine islets exposed to human serum was not due to the activation of complement and there was no evidence of hyperacute rejection mediated by complement activation in the in vitro model of pig-to-human islet transplantation.

journal_name

Cell Transplant

journal_title

Cell transplantation

authors

Kin T,Nakajima Y,Kanehiro H,Aomatsu Y,Yoshimura A,Taki J,Ko S,Yagura K,Oyama T,Ohashi K,Nakano H

doi

10.1016/0963-6897(96)00038-3

subject

Has Abstract

pub_date

1996-09-01 00:00:00

pages

S45-7

issue

5 Suppl 1

eissn

0963-6897

issn

1555-3892

pii

0963689796000383

journal_volume

5

pub_type

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