alexa Differential role and tissue specificity of interleukin-1alpha gene expression in atherogenesis and lipid metabolism.


Angiology: Open Access

Author(s): Kamari Y

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We examined the role of IL-1alpha and IL-1beta expressed by bone marrow-derived cells in atherogenesis and lipid metabolism.


We first studied the effect of atherogenic diet on wild-type C57BL/6 IL-1alpha or IL-1beta deficient mice. IL-1alpha KO resulted in a comparatively higher total cholesterol levels, compared to WT and IL-1beta KO mice (398+/-10; 266+/-19; 223+/-13 mg/dl, respectively, p<0.001), due to higher non-HDL cholesterol. Nevertheless, aortic sinus lesion area was 56% lower in IL-1alpha KO (p<0.05) and 50% lower in IL-1beta KO (p=0.08), compared to WT mice. Likewise, SAA levels in IL-1alpha KO mice were markedly lower compared to WT and IL-1beta KO mice (31+/-14; 220+/-33 and 106+/-39 microg/ml, respectively, p<0.001). To study the specific role of bone marrow-derived IL-1, irradiated C57BL/6 mice were transplanted with either IL-1+/+, IL-1alpha-/- or IL-1beta-/- bone marrow cells. Despite similar lipoprotein levels, aortic sinus lesion area was 59% lower in IL-1alpha-/- transplanted (p<0.05) compared to IL-1+/+ transplanted mice. Lesion area in IL-1beta-/- was 33% lower than in IL-1+/+ recipient mice, but it was not statistically significant.


We demonstrated that early lesion formation is accelerated specifically by bone marrow-derived IL-1alpha. Furthermore, we showed that the expression of IL-1alpha in cells other than the bone marrow plays a significant role in non-HDL cholesterol metabolism.

This article was published in Atherosclerosis and referenced in Angiology: Open Access

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