Intermittent hypoxia and hypercapnia induces inhibitor of nuclear factor-κB kinase subunit ß-dependent atherosclerosis in pulmonary arteries.
Am J Physiol Regul Integr Comp Physiol
; 317(6): R763-R769, 2019 12 01.
Article
em En
| MEDLINE
| ID: mdl-31618063
ABSTRACT
Clinical studies have shown that obstructive sleep apnea (OSA) increases atherosclerosis risk. The inflammation, especially mediated by the macrophages via nuclear factor-κB (NF-κB), has been speculated to contribute to atherogenicity in OSA patients. Inhibitor of NF-κB kinase-ß (IKKß) is an essential element of the NF-κB pathway and is linked to atherosclerosis. We previously reported that atherosclerosis was accelerated in pulmonary artery (PA) but not in aorta when low-density lipoprotein receptor knockout (Ldlr-/-) mice were exposed to intermittent hypoxia/hypercapnia (IHH), a surrogate for recurrent upper-airway obstruction. Therefore, we hypothesized that IKKß-dependent NF-κB activation in monocytes and macrophages plays a role in IHH-induced PA atherosclerosis. To test this hypothesis, myeloid restricted IKKß deletion (IkkßΔMye) or control (IkkßF/F) mice were crossed with Ldlr-/- mice to generate double-knockout mice. Then, the mice were exposed to IHH or room air (Air) on high-fat diet for 8 or 16 wk. Lesions of PA and aorta were examined in IkkßΔMye;Ldlr-/- and IkkßF/F;Ldlr-/- male mice under IHH vs. Air. The results revealed that IKKß deletion abolished IHH-induced PA atherosclerosis after 8-wk exposure but not after 16-wk exposure (8 wk IkkßF/F;Ldlr-/-, IHH 13.5 ± 1.4 vs. Air 5.7 ± 0.7%, P < 0.01; IkkßΔMye;Ldlr-/-, IHH 7.4 ± 1.9% vs. Air 4.6 ± 1.3%, P = 0.24). Both IKKß deletion and IHH had no effects on atherosclerosis in the aorta. Our findings demonstrate that IKKß-dependent NF-κB activity in myeloid-lineage cells plays a critical role in IHH-induced PA atherosclerosis at the early stage.
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Base de dados:
MEDLINE
Assunto principal:
Oxigênio
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Dióxido de Carbono
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Aterosclerose
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Quinase I-kappa B
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Hipercapnia
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Hipóxia
Limite:
Animals
Idioma:
En
Revista:
Am J Physiol Regul Integr Comp Physiol
Assunto da revista:
FISIOLOGIA
Ano de publicação:
2019
Tipo de documento:
Article