Jump to main content
Jump to site search

Issue 5, 2006
Previous Article Next Article

UV-B light induces an adaptive response to UV-C exposure via photoreactivation activity in Euglena gracilis

Author affiliations

Abstract

Phytoplankton such as Euglena are constantly exposed to solar light which is used for photosynthesis. Although the solar ultraviolet (UV) induces DNA damage such as cyclobutane-pyrimidine dimers (CPDs), many kinds of living organisms can repair CPDs by photoreactivation (PR) utilizing the near-UV/blue light component in sunlight. Euglena cells are known to possess such PR activity. In the present paper, the formation of CPDs induced by UV-C exposure and the photoreactivation PR repair of these CPDs by UV-A are demonstrated. To clarify the adaptive responses prior UV-B irradiation on PR activity, cells were cultured in the dark or under UV-B light. When the cells were cultured in the dark for 3 d prior to UV-C exposure, PR activity decreased. When the cells were cultured under UV-B light, however, PR activity increased. These results suggest that exposing the cells to UV-B prior to exposure to UV-C induced an adaptive response towards DNA damage caused by UV-C exposure, and this UV-C induced damage was repaired through PR activity.

Graphical abstract: UV-B light induces an adaptive response to UV-C exposure via photoreactivation activity in Euglena gracilis

Back to tab navigation

Publication details

The article was received on 09 Feb 2006, accepted on 27 Mar 2006 and first published on 24 Apr 2006


Article type: Paper
DOI: 10.1039/B601971D
Citation: Photochem. Photobiol. Sci., 2006,5, 467-471
  •   Request permissions

    UV-B light induces an adaptive response to UV-C exposure via photoreactivation activity in Euglena gracilis

    A. Takahashi, N. Shibata, S. Nishikawa, K. Ohnishi, N. Ishioka and T. Ohnishi, Photochem. Photobiol. Sci., 2006, 5, 467
    DOI: 10.1039/B601971D

Search articles by author

Spotlight

Advertisements