Chemical carcinogenesis – Ulla Stenius' group

We analyze sex differences in response to carcinogens and the carcinogenic effects of silica. The goal of the projects is to improve the scientific base for risk assessment.

Projects

 

Gender differences in chemical carcinogenesis
Men get more cancer than women and understanding this gender difference may lead to means to reduce the cancer burden by 30%. The reason for this difference is largely unknown. In this project we investigate sex differences in response to carcinogens. The specific purpose is to investigate how variable androgen receptor activity affect environmental carcinogen-induced DNA damage in stem cells and its possible role for cancer susceptibility. We also aim to identify chemicals exhibiting sexual dimorphism in their response.

This project is funded by Formas

Cancer risk associated with low dose silica exposure
The overall aim of this project is to characterize mechanisms for silica-induced inflammation and DNA damage at low doses. In cell studies we have found that silica particles induce inflammation and DNA damage in lower doses than previously employed. The finding that this occurs in epithelial cells suggests that this may have a direct bearing on silica-related lung cancer. Our data challenges the mode of action for silica carcinogenesis and suggests that cancer should be seen not as a sequel of silicosis but rather as process that develops in parallel with silicosis. In this project, an alternative type of DNA damage mechanism will be studied. We have found that silica particles cause double strand breaks and micronuclei through activation of endonuclease G. The mechanism will be further characterized in experimental models and its relevance to cancer development investigated. The project may lead to a simplified risk assessment of silica and perhaps also to a lowering of occupational exposure limits.


This project is funded by AFA försäkring

 

Publications

Selected publications

Funding

Grants

  • New type of DNA damage can be crucial for silica-induced carcinogenesis
    AFA Försäkring
    1 July 2023 - 30 June 2026
  • Swedish Research Council for Environment Agricultural Sciences and Spatial Planning
    1 January 2023 - 31 December 2025
    Men have higher cancer incidences than women. Lifetime risk for men is 50% and for women 30% and an incidence quote of 1.8 for men/women has been shown for cancer in non-sex organs. Calculations suggest that a third of all cancer cases should be possible to eliminate if causes were known and could be eliminated. Further support for differences is that men have worse survival statistics and that boys have worse cancer prognosis. We have found that skin carcinogens inactivate androgen receptor (AR) in human stem cells. In the present project we will study if carcinogen-induced inactivation of androgen receptor (AR) in human stem cells can explain men’s susceptibility to cancer, and in particular the high incidence for older men. We will 1) investigate how environmental carcinogens inactivate AR, 2) analyze the consequences of AR inactivation concerning DNA damage and repair, 3) study if carcinogens interact with age-dependent decline in testosterone levels and increase DNA damage and mutation burden, and 4) analyze differences in tumor-specific mutational burden between genders. Our study will hopefully explain a major risk factor behind melanoma and perhaps also men´s cancer susceptibility for several other tumors. Our study may also suggest tools to decrease men´s cancer incidence, as well as the total cancer incidence, via a development of new risk assessment strategies.

Staff and contact

Group leader

All members of the group

Visiting address

Karolinska Institutet, Institutet för Miljömedicin, Nobels väg 13, Stockholm, 17177, Sweden

Postal address

Karolinska Institutet, Institute of Environmental Medicine, Box 210, Stockholm, 17177, Sweden