Renin-angiotensin System Impairs Macrophage Lipid Metabolism to Promote Age-related Macular Degeneration in Mouse Models

Overview

Journal Commun Biol

Specialty Biology

Date 2020 Dec 10

PMID 33299105

Citations 11

Authors

Norihiro Nagai

Hirohiko Kawashima

Eriko Toda

Kohei Homma

Hideto Osada

Naymel A Guzman

Shinsuke Shibata

Yasuo Uchiyama

Hideyuki Okano

Kazuo Tsubota

Yoko Ozawa

Affiliations

Soon will be listed here.

Abstract

Metabolic syndrome, a condition involving obesity and hypertension, increases the risk of aging-associated diseases such as age-related macular degeneration (AMD). Here, we demonstrated that high-fat diet (HFD)-fed mice accumulated oxidized low-density lipoprotein (ox-LDL) in macrophages through the renin-angiotensin system (RAS). The ox-LDL-loaded macrophages were responsible for visual impairment in HFD mice along with a disorder of the retinal pigment epithelium (RPE), which is required for photoreceptor outer segment renewal. RAS repressed ELAVL1, which reduced PPARγ, impeding ABCA1 induction to levels that are sufficient to excrete overloaded cholesterol within the macrophages. The ox-LDL-loaded macrophages expressed inflammatory cytokines and attacked the RPE. An antihypertensive drug, angiotensin II type 1 receptor (AT1R) blocker, resolved the decompensation of lipid metabolism in the macrophages and reversed the RPE condition and visual function in HFD mice. AT1R signaling could be a future therapeutic target for macrophage-associated aging diseases, such as AMD.

Citing Articles

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