Cited by 64melanin and skin pigmentationMicrotubule and mitosis dynamicsCellular transport and secretion

Role of Cytoplasmic Dynein in Perinuclear Aggregation of Phagocytosed Melanosomes and Supranuclear Melanin Cap Formation in Human Keratinocytes

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Randolph Byers, H., Maheshwary, Soniya, Amodeo, Dana M., Dykstra, Sarah G.·2003·Journal of Investigative Dermatology

Abstract

Cytoplasmic dynein is a microtubule-associated motor molecule involved in the retrograde transport of membrane-bound organelles. To determine whether the supranuclear melanin cap of transferred, phagocytosed melanosomes in keratinocytes is associated with cytoplasmic dynein, we performed immunofluorescent confocal microscopy on human keratinocytes in situ. We identified the intermediate chain of cytoplasmic dynein by immunoblotting and examined its distribution by confocal microscopy in relation to microtubules and melano-phagolysosomes in vitro. We also used antisense and sense oligonucleotides of the cytoplasmic dynein heavy chain 1 (Dyh1) and time-lapse and microscopy. The intermediate chain of cytoplasmic dynein was identified in extracts of human foreskin epidermis and in isolated human keratinocytes. The intermediate chain localized with the perinuclear melano-phagolysosomal aggregates in vitro and the supranuclear melanin cap in situ. Antisense oligonucleotides directed towards Dyh1 resulted in dispersal of the keratinocyte perinuclear melano-phagolysosomal aggregates after 24 to 48 h, whereas cells treated with diluent or sense oligonucleotides maintained tight perinuclear aggregates. Taken together, these findings indicate that in human keratinocytes, the retrograde microtubule motor cytoplasmic dynein mediates the perinuclear aggregation of phagocytosed melanosomes, participates in the formation of the supranuclear melanin cap or "microparasol" and serves as a mechanism to help protect the nucleus from ultraviolet-induced DNA damage.

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Crossref · 10.1046/j.1523-1747.2003.12481.x

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Authors
Randolph Byers, H., Maheshwary, S., Amodeo, D. M., & Dykstra, S. G.
Affiliations
Boston University (US)
Venue
Journal of Investigative Dermatology
Publisher
Elsevier BV
Published
2003-10
Volume
121
Issue
4
Pages
813-820
ISSN
0022-202X (ISSN-L)
OpenAlex
W1996513213
Cited by
63
References
77
Citations by year
2026: 2 · 2025: 5 · 2023: 6 · 2022: 2 · 2021: 4 · 2020: 2 · 2019: 3 · 2018: 5 · 2017: 3 · 2016: 1 · 2015: 1 · 2013: 3 · 2012: 2
FWCI
0.97
Type
journal article
Language
en
Open access
Locations
  • Journal of Investigative Dermatology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › melanin and skin pigmentation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
Keywords
cytoplasmic dynein, dynein intermediate chain, melanosomes, phagocytosis, keratinocytes, retrograde transport, microtubule motor proteins, antisense oligonucleotides, UV-induced DNA damage, nuclear protection
MeSH terms
Cell Nucleus, Cells, Cultured, Cytoplasm, Dyneins, Humans, Melanocytes, Microtubules, Phagocytosis, Keratinocytes, Oligonucleotides, Antisense, Melanosomes

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