Angiopoietin-like protein 7 (ANGPTL7)-mediated effects on resident immune cells contribute to neurodegeneration in glaucomatous optic nerve head
Vollmer, T. R.; Dolan, K.; Xiang, C.; Banks, A.; Cooney, E. M.; Heyder, J.; King, C. C.; Vrouvlianis, J.; Gujar, A. N.; Kirkpatrick, N. D.; Wu, X.; Jones, C.; Miraglia, L. J.; Orth, A. P.; Qiu, Y.; Prentiss, M.; Hassan, I. S.; Kwan, J.; Garcia Caro, R.; Fan, L.; Wang, Y.; Niu, S.-Y.; Huang, C.-L.; Raghunathan, V.; Chen, A.; Vo, N.; Chui, A.; Esterberg, R.; Prasanna, G.; Wilson, C. W.
Show abstract
Glaucoma is an optic neuropathy characterized by progressive retinal degeneration. Population genetic analyses describe an association of variants in angiopoietin-like protein 7 (ANGPTL7) with lower intraocular pressure (IOP) and decreased glaucoma susceptibility. In addition to its reported role in the trabecular meshwork (TM), we demonstrate that ANGPTL7 is also expressed within disease-relevant cell types of the human posterior eye, specifically prelaminar optic nerve head astrocytes (ONHA). Contrasting with previously published findings, we observe no difference in IOP between Angptl7-/- mice and wild-type littermates. Despite absence of an IOP phenotype, loss of ANGPTL7 protects from IOPinduced retinal ganglion cell (RGC) damage in a rodent glaucoma neurodegeneration model. ANGPTL7 may signal through LAIR1-positive immune cells, potentially contributing to pro-inflammatory signaling and phenotypic modulation of resident immune cells, with evidence suggesting that oligomerization of ANGPTL7 is necessary for its activity. Comprehensively, our data highlight an unappreciated role of ANGPTL7 in modulating neuroinflammation in the posterior eye, contributing to glaucoma progression.
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