, Volume 51, Issue 8, pp 1449-1456
Date: 19 Jun 2008

A new immunodeficient hyperglycaemic mouse model based on the Ins2 Akita mutation for analyses of human islet and beta stem and progenitor cell function

Abstract

Aims/hypothesis

To develop and validate a new immunodeficient mouse strain that spontaneously develops a non-autoimmune hyperglycaemia to serve as a diabetic host for human islets and human beta stem and progenitor cells without the need for induction of hyperglycaemia by toxic chemicals with their associated side effects.

Methods

We generated and characterised a new strain of immunodeficient spontaneously hyperglycaemic mice, the NOD-Rag1 null Prf1 null Ins2 Akita strain and compared this strain with the NOD-scid Il2rγ null (also known as Il2rg) immunodeficient strain rendered hyperglycaemic by administration of a single dose of streptozotocin. Hyperglycaemic mice were transplanted with human islets ranging from 1,000 to 4,000 islet equivalents (IEQ) and were monitored for normalisation of blood glucose levels.

Results

NOD-Rag1 null Prf1 null Ins2 Akita mice developed spontaneous hyperglycaemia, similar to Ins2 Akita -harbouring strains of immunocompetent mice. Histological examination of islets in the host pancreas validated the spontaneous loss of beta cell mass in the absence of mononuclear cell infiltration. Human islets transplanted into spontaneously diabetic NOD-Rag1 null Prf1 null Ins2 Akita and chemically diabetic NOD-scid Il2rγ null mice resulted in a return to euglycaemia that occurred with transplantation of similar beta cell masses.

Conclusions/interpretation

The NOD-Rag1 null Prf1 null Ins2 Akita mouse is the first immunodeficient, spontaneously hyperglycaemic mouse strain described that is based on the Ins2 Akita mutation. This strain is suitable as hosts for human islet and human beta stem and progenitor cell transplantation in the absence of the need for pharmacological induction of diabetes. This strain of mice also has low levels of innate immunity and can be engrafted with a human immune system for the study of human islet allograft rejection.