The 10q26 Risk Haplotype of Age-Related Macular Degeneration Aggravates Subretinal Inflammation by Impairing Monocyte Elimination
A minor haplotype of the 10q26 locus conveys the strongest genetic risk for age-related macular degeneration (AMD). Here, we examined the mechanisms underlying this susceptibility. We found that monocytes from homozygous carriers of the 10q26 AMD-risk haplotype expressed high amounts of the serine p...
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Veröffentlicht in: | Immunity (Cambridge, Mass.) Mass.), 2020-08, Vol.53 (2), p.429-441.e8 |
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Zusammenfassung: | A minor haplotype of the 10q26 locus conveys the strongest genetic risk for age-related macular degeneration (AMD). Here, we examined the mechanisms underlying this susceptibility. We found that monocytes from homozygous carriers of the 10q26 AMD-risk haplotype expressed high amounts of the serine peptidase HTRA1, and HTRA1 located to mononuclear phagocytes (MPs) in eyes of non-carriers with AMD. HTRA1 induced the persistence of monocytes in the subretinal space and exacerbated pathogenic inflammation by hydrolyzing thrombospondin 1 (TSP1), which separated the two CD47-binding sites within TSP1 that are necessary for efficient CD47 activation. This HTRA1-induced inhibition of CD47 signaling induced the expression of pro-inflammatory osteopontin (OPN). OPN expression increased in early monocyte-derived macrophages in 10q26 risk carriers. In models of subretinal inflammation and AMD, OPN deletion or pharmacological inhibition reversed HTRA1-induced pathogenic MP persistence. Our findings argue for the therapeutic potential of CD47 agonists and OPN inhibitors for the treatment of AMD.
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•10q26 AMD-risk haplotype carrying monocytes overexpress HTRA1 and OPN•HTRA1 locates to mononuclear phagocytes in eyes of patients with AMD•HTRA1 proteolysis of TSP-1 curbs CD47-dependent OPN repression•HTRA1 induced OPN promotes pathogenic subretinal MP accumulation
A minor haplotype of the 10q26 locus conveys the strongest genetic risk for age-related macular degeneration (AMD). Beguier et al. provide a mechanistic understanding of this susceptibility by linking this risk haplotype to overexpression of the peptidase HTRA1 and thereby to the accumulation of macrophages in the subretinal space and pathogenic inflammation. |
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ISSN: | 1074-7613 1097-4180 |
DOI: | 10.1016/j.immuni.2020.07.021 |