Cited by 30Phagocytosis and Immune RegulationAutophagy in Disease and TherapyCell death mechanisms and regulation

Context-dependent compensation among phosphatidylserine-recognition receptors

Open access
Penberthy, Kristen K., Rival, Claudia, Shankman, Laura S., Raymond, Michael H., Zhang, Jianye, Perry, Justin S. A., Lee, Chang Sup, Han, Claudia Z. +4 more·2017·Scientific Reports

Abstract

Abstract Phagocytes express multiple phosphatidylserine (PtdSer) receptors that recognize apoptotic cells. It is unknown whether these receptors are interchangeable or if they play unique roles during cell clearance. Loss of the PtdSer receptorMertkis associated with apoptotic corpse accumulation in the testes and degeneration of photoreceptors in the eye. Both phenotypes are linked to impaired phagocytosis by specialized phagocytes: Sertoli cells and the retinal pigmented epithelium (RPE). Here, we overexpressed the PtdSer receptor BAI1 in mice lacking MerTK (Mertk−/−Bai1Tg) to evaluate PtdSer receptor compensationin vivo. WhileBai1overexpression rescues clearance of apoptotic germ cells in the testes ofMertk−/−mice it fails to enhance RPE phagocytosis or prevent photoreceptor degeneration. To determine why MerTK is critical to RPE function, we examined visual cycle intermediates and performed unbiased RNAseq analysis of RPE fromMertk+/+andMertk−/−mice. Prior to the onset of photoreceptor degeneration,Mertk−/−mice had less accumulation of retinyl esters and dysregulation of a striking array of genes, including genes related to phagocytosis, metabolism, and retinal disease in humans. Collectively, these experiments establish that not all phagocytic receptors are functionally equal, and that compensation among specific engulfment receptors is context and tissue dependent.

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  • Although the extent of MERTK's requirement may differ among tissues, it plays a central role, directly or indirectly affecting the regulation of a wide variety of genes including those involved in cytoskeletal rearrangement and phagosome maturation.

    “Although the extent of its requirement may differ among different tissues, it nevertheless plays a central role, directly or indirectly affecting the regulation of a wide variety of genes including those involved in cytoskeletal rearrangement and phagosome maturation (Shelby et al., 2013; Penberthy et al., 2017).”

    From The cell biology of the retinal pigment epithelium (2020) · cites this paper as Penberthy et al., 2017

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  1. [30]Sethna, S. & Finnemann, S. C. In Methods in Molecular Biology935, 245–254 (Humana Press, 2012).
  2. [64]Gibbs, D. & Williams, D. S. In Retinal Degenerations (eds. LaVail, M. M., Hollyfield, J. G. & Anderson, R. E.) 533, 347–352 (Springer US, 2003).

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Authors
Penberthy, K. K., Rival, C., Shankman, L. S., Raymond, M. H., Zhang, J., Perry, J. S. A., Lee, C. S., Han, C. Z., Onengut-Gumuscu, S., Palczewski, K., Lysiak, J. J., & Ravichandran, K. S.
Affiliations
  • University of Virginia (US)
  • Case Western Reserve University (US)
  • Gyeongsang National University (KR)
  • Ghent University (BE)
Corresponding author
Ravichandran, Kodi S.
Venue
Scientific Reports
Published
2017-11-07
Volume
7
Issue
1
Pages
14623-14623
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2767021156
Cited by
30
References
83
Citations by year
2026: 4 · 2025: 3 · 2024: 4 · 2023: 5 · 2022: 3 · 2021: 4 · 2020: 2 · 2019: 2 · 2018: 3
FWCI
0.87
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Ghent University Academic Bibliography (Ghent University) (submittedVersion, cc-by)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
  • University of Virginia
  • National Institutes of Health (NIH T32, GM064709)
  • National Heart, Lung, and Blood Institute (P01HL120840, F30HL126385)
  • National Cancer Institute (T32CA009109)
  • National Institute of General Medical Sciences (GM-064709, R35GM122542, R01GM064709, T32GM008136)
  • National Institute of Allergy and Infectious Diseases (T32AI007496)
  • National Center for Research Resources (S10RR026799)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01HD074981)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
phosphatidylserine receptor, efferocytosis, MERTK, BAI1, phagocytosis, Sertoli cells, retinal pigment epithelium, photoreceptor degeneration, retinyl esters, visual cycle, retinal gene expression
MeSH terms
c-Mer Tyrosine Kinase, Animals, Germ Cells, Humans, Male, Phagocytosis, Sertoli Cells, Apoptosis, Mice, Knockout, Angiogenic Proteins, Mice, Retinal Pigment Epithelium

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