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Epsin 3 is a novel extracellular matrix-induced transcript specific to wounded epithelia
K D Spradling1, A E McDaniel, J Lohi
1Department of Cell Biology, The University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390, USA.
The Journal of Biological Chemistry
|May 22, 2001
Summary
Researchers discovered a new protein, epsin 3, in skin cells activated by collagen after injury. Epsin 3 is specifically found in migrating keratinocytes during wound healing, suggesting a role in tissue repair.
Area of Science:
- Cell Biology
- Biochemistry
- Dermatology
Background:
- Epsins are proteins involved in cellular processes like endocytosis.
- Keratinocyte activation by the extracellular matrix is crucial for wound healing.
- Understanding novel protein regulation in epithelial cells is key to tissue repair research.
Purpose of the Study:
- To identify and characterize novel proteins involved in keratinocyte activation.
- To investigate the role of epsin 3 in response to extracellular matrix components.
- To determine the expression pattern and regulation of epsin 3 in epithelial wound healing.
Main Methods:
- In vitro model of keratinocyte activation.
- Analysis of protein expression using Northern hybridization and reverse transcriptase-polymerase chain reaction.
- Immunofluorescence microscopy to determine protein localization and co-localization with clathrin.
- Inhibition of nuclear export to study protein localization.
Main Results:
- A novel protein, epsin 3, was identified and found to be distinct from previously described epsins.
- Epsin 3 expression was induced in keratinocytes upon contact with fibrillar type I collagen, but not gelatin.
- Epsin 3 localized to punctate vesicles and partially co-localized with clathrin, and showed nuclear accumulation upon inhibition of nuclear export.
- Epsin 3 expression was restricted to migrating keratinocytes in wounds and down-regulated upon differentiation, indicating spatial and temporal regulation.
- Northern hybridization and RT-PCR confirmed epsin 3 expression was limited to epithelial wounds or pathologies with altered cell-extracellular matrix interactions.
Conclusions:
- Epsin 3 is a novel type I collagen-induced epsin with unique regulatory and expression patterns.
- Its restricted expression in migrating keratinocytes during wound healing suggests a specific role in activated epithelial cells.
- Epsin 3 may be important for tissue morphogenesis and repair processes involving altered cell-extracellular matrix interactions.