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Updated: Oct 22, 2025
Characterization of Molecular Mechanisms of In vivo UVR Induced Cataract
Published on: November 28, 2012
SerpinB10, a Serine Protease Inhibitor, Is Implicated in UV-Induced Cellular Response
Hajnalka Majoros1, Barbara N Borsos1, Zsuzsanna Ujfaludi1
1Institute of Pathology, Faculty of Medicine, University of Szeged, 1 Állomás utca, H-6725 Szeged, Hungary.
Abstract:
UV-induced DNA damage response and repair are extensively studied processes, as any malfunction in these pathways contributes to the activation of tumorigenesis. Although several proteins involved in these cellular mechanisms have been described, the entire repair cascade has remained unexplored. To identify new players in UV-induced repair, we performed a microarray screen, in which we found SerpinB10 (SPB10, Bomapin) as one of the most dramatically upregulated genes following UV irradiation. Here, we demonstrated that an increased mRNA level of SPB10 is a general cellular response following UV irradiation regardless of the cell type. We showed that although SPB10 is implicated in the UV-induced cellular response, it has no indispensable function in cell survival upon UV irradiation. Nonetheless, we revealed that SPB10 might be involved in delaying the duration of DNA repair in interphase and also in S-phase cells. Additionally, we also highlighted the interaction between SPB10 and H3. Based on our results, it seems that SPB10 protein is implicated in UV-induced stress as a "quality control protein", presumably by slowing down the repair process.
Insights
SerpinB10 (SPB10) is upregulated after UV DNA damage. While not essential for survival, SPB10 may act as a quality control protein, potentially delaying DNA repair processes.
Area of Science:
- Molecular Biology
- Cellular Biology
- Genetics
Background:
- DNA damage response and repair are crucial for preventing tumorigenesis.
- UV irradiation is a significant source of DNA damage.
- The complete cascade of UV-induced DNA repair remains incompletely understood.
Purpose of the Study:
- To identify novel proteins involved in the UV-induced DNA repair pathway.
- To investigate the role of SerpinB10 (SPB10) in cellular response to UV irradiation.
Main Methods:
- Microarray screening to identify upregulated genes post-UV irradiation.
- Analysis of SPB10 mRNA levels across different cell types.
- Assessment of SPB10's role in cell survival and DNA repair kinetics.
- Investigation of SPB10 protein interactions, including with H3.
Main Results:
- SerpinB10 (SPB10) was identified as a significantly upregulated gene following UV irradiation.
- Increased SPB10 mRNA levels are a general cellular response to UV damage, irrespective of cell type.
- SPB10 is not essential for cell survival after UV exposure.
- SPB10 may delay DNA repair in interphase and S-phase cells.
- An interaction between SPB10 and H3 was observed.
Conclusions:
- SPB10 is a component of the cellular response to UV-induced stress.
- SPB10 functions as a potential "quality control protein" by modulating DNA repair duration.
- Further research is needed to fully elucidate SPB10's precise role in DNA repair mechanisms.
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