Nonobese diabetic (NOD) mice congenic for a targeted deletion of 12/15-lipoxygenase are protected from autoimmune diabetes.
Diabetes
; 57(1): 199-208, 2008 Jan.
Article
en En
| MEDLINE
| ID: mdl-17940120
ABSTRACT
OBJECTIVE:
12/15-lipoxygenase (12/15-LO), one of a family of fatty acid oxidoreductase enzymes, reacts with polyenoic fatty acids to produce proinflammatory lipids. 12/15-LO is expressed in macrophages and pancreatic beta-cells. It enhances interleukin 12 production by macrophages, and several of its products induce apoptosis of beta-cells at nanomolar concentrations in vitro. We had previously demonstrated a role for 12/15-LO in beta-cell damage in the streptozotocin model of diabetes. Since the gene encoding 12/15-LO (gene designation Alox15) lies within the Idd4 diabetes susceptibility interval in NOD mice, we hypothesized that 12/15-LO is also a key regulator of diabetes susceptibility in the NOD mouse. RESEARCH DESIGN ANDMETHODS:
We developed NOD mice carrying an inactivated 12/15-LO locus (NOD-Alox15(null)) using a "speed congenic" protocol, and the mice were monitored for development of insulitis and diabetes.RESULTS:
NOD mice deficient in 12/15-LO develop diabetes at a markedly reduced rate compared with NOD mice (2.5 vs. >60% in females by 30 weeks). Nondiabetic female NOD-Alox15(null) mice demonstrate improved glucose tolerance, as well as significantly reduced severity of insulitis and improved beta-cell mass, when compared with age-matched nondiabetic NOD females. Disease resistance is associated with decreased numbers of islet-infiltrating activated macrophages at 4 weeks of age in NOD-Alox15(null) mice, preceding the development of insulitis. Subsequently, islet-associated infiltrates are characterized by decreased numbers of CD4(+) T cells and increased Foxp3(+) cells.CONCLUSIONS:
These results suggest an important role for 12/15-LO in conferring susceptibility to autoimmune diabetes in NOD mice through its effects on macrophage recruitment or activation.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Araquidonato 12-Lipooxigenasa
/
Araquidonato 15-Lipooxigenasa
/
Diabetes Mellitus Tipo 1
Límite:
Animals
Idioma:
En
Año:
2008
Tipo del documento:
Article