Cited by 50Cellular transport and secretionAutophagy in Disease and TherapyRetinal Development and Disorders

Melanoregulin (MREG) modulates lysosome function in pigment epithelial cells

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Damek-Poprawa, Monika, Diemer, Tanja, Lopes, Vanda S., Lillo, Concepción, Harper, Dawn C., Marks, Michael S., Wu, Yalin, Sparrow, Janet R. +3 more·2009·Journal of Biological Chemistry

Abstract

Melanoregulin (MREG), the product of the Mreg(dsu) gene, is a small highly charged protein, hypothesized to play a role in organelle biogenesis due to its effect on pigmentation in dilute, ashen, and leaden mutant mice. Here we provide evidence that MREG is required in lysosome-dependent phagosome degradation. In the Mreg(-/-) mouse, we show that loss of MREG function results in phagosome accumulation due to delayed degradation of engulfed material. Over time, the Mreg(-/-) mouse retinal pigment epithelial cells accumulate the lipofuscin component, A2E. MREG-deficient human and mouse retinal pigment epithelial cells exhibit diminished activity of the lysosomal hydrolase, cathepsin D, due to defective processing. Moreover, MREG localizes to small intracellular vesicles and associates with the endosomal phosphoinositide, phosphatidylinositol 3,5-biphosphate. Collectively, these studies suggest that MREG is required for lysosome maturation and support a role for MREG in intracellular trafficking.

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Crossref · 10.1074/jbc.m808857200

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  • ARPE-19 and primary RPE cells ingest OSs in less than 1 h.

    “ARPE-19 and primary RPE cells have been shown to ingest OSs in less than 1 h (Gibbs et al., 2003; Damek-Poprawa et al., 2009; Olchawa et al., 2013; Wavre-Shapton et al., 2014)”

    From The cell biology of the retinal pigment epithelium (2020) · cites this paper as Damek-Poprawa et al., 2009

  • RPE from Mreg−/− mice have decreased levels of the mature cathepsin D enzyme.

    “RPE from Mreg−/− mice have decreased levels of the mature enzyme (Damek-Poprawa et al., 2009), and increased secretion of pro-cathepsin D into the extracellular medium (Frost et al., 2013).”

    From The cell biology of the retinal pigment epithelium (2020) · cites this paper as Damek-Poprawa et al., 2009

  • Loss of MREG, an LC3B binding partner, contributes to a delay in phagosome maturation and lysosomal exocytosis, as well as basal laminar thickening in older mice.

    “Loss of MREG, an LC3B binding partner contributes to a delay in phagosome maturation (Damek-Poprawa et al., 2009) and lysosomal exocytosis, as well as basal laminar thickening in older mice (Frost et al., 2013).”

    From The cell biology of the retinal pigment epithelium (2020) · cites this paper as Damek-Poprawa et al., 2009

  • Phagosome accumulation is observed in the absence of MREG.

    “Phagosome accumulation is observed in the absence of MREG (Damek-Poprawa et al., 2009)”

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Authors
Damek-Poprawa, M., Diemer, T., Lopes, V. S., Lillo, C., Harper, D. C., Marks, M. S., Wu, Y., Sparrow, J. R., Rachel, R. A., Williams, D. S., & Boesze-Battaglia, K.
Affiliations
  • University of Pennsylvania (US)
  • University of California, Los Angeles (US)
  • University of California San Diego (US)
  • Columbia University (US)
  • National Institutes of Health (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2009-04
Volume
284
Issue
16
Pages
10877-10889
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2093780646
Cited by
50
References
89
Citations by year
2026: 2 · 2025: 2 · 2024: 4 · 2023: 4 · 2022: 4 · 2021: 1 · 2020: 6 · 2019: 2 · 2018: 4 · 2017: 2 · 2016: 3 · 2015: 2 · 2014: 6 · 2013: 1 · 2012: 5
FWCI
1.04
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • ScholarlyCommons (University of Pennsylvania) (submittedVersion)
Funders
  • National Institutes of Health (5p30ey012598-05)
  • National Eye Institute (R01EY012951, EY 12951, R01EY010420, R21EY018705, EY-15625, P30-EY12598, EY-00331, R01EY007042, EY07042, R29EY010420, R01EY015625, P30EY001583, EY-10420)
  • National Center for Research Resources (S10RR026365)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
Keywords
lysosome maturation, retinal pigment epithelial cells, lipofuscin, A2E, cathepsin D, phosphatidylinositol 3,5-bisphosphate, endosomal trafficking, organelle biogenesis
MeSH terms
Animals, Carrier Proteins, Cathepsin D, Cell Line, Epithelial Cells, Humans, Lipofuscin, Lysosomes, Mice, Inbred C57BL, Phagocytosis, Phosphatidylethanolamines, Pigment Epithelium of Eye, Pyridinium Compounds, Retinaldehyde, Retinoids, Phosphatidylinositol Phosphates, Mice, Knockout, Adaptor Proteins, Vesicular Transport, RNA, Small Interfering, Intracellular Signaling Peptides and Proteins, Mice

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