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2012 Fiscal Year Final Research Report

Effects of increased tissue oxygen tension on dermal aging

Research Project

  • PDF
Project/Area Number 23700827
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Applied health science
Research InstitutionThe University of Tokyo

Principal Investigator

KAWADA Shigeo  東京大学, 大学院・総合文化研究科, 特任研究員 (20376601)

Project Period (FY) 2011 – 2012
Keywords生理学 / 老化 / ストレス / シグナル伝達 / 生体機能利用
Research Abstract

The aim of this study was to investigate whether increased dermal oxygen tension attenuates ultraviolet (UV)-B-induced dermal angiogenesis and wrinkle formation.In experiment 1, the backs of the mice were exposed to UVB three times per week for a5-wk. To increase dermal oxygen tension, the mice were exposed to hyperoxia (90% oxygen) for 2 h immediately after each UVB irradiation. This experiment cleared that such acute UVB exposure results in wrinkle formation associated with increased cutaneousangiogenesis. However, hyperoxic exposure immediately after UVB exposure attenuates these phenomena.In experiment 2, we investigated the effects of hyperoxia on dermal aging induced by higher doses and longer periods of UVB irradiation. The backs of the mice were exposed to UVB three times per week for a 10-wk. Hyperoxic conditions could suppress increases in hypoxia-inducible factor (HIF)-1α levels, a key molecule for angiogenesis. However, UVB-induced wrinkle formation and angiogenesis were not attenuated. Activities of matrix metalloproteinases (MMP)-2 and MMP-9, which are key molecules in wrinkle formation, increased with higher-dose and longer-term UVB irradiation regardless of exposure to hyperoxic conditions. In experiment 1, MMP-2 and MMP-9 activities did not increase. These results suggest that suppression of increases in HIF-1α levels alone is insufficient to suppress wrinkle formation caused by higher doses and longer periods of UVB irradiation. Moreover, MMP-2 and MMP-9 might not play a critical role in either wrinkle formation or angiogenesis during the early stage of acute UVB-induced wrinkle formation.

  • Research Products

    (2 results)

All 2013 2011

All Journal Article (2 results) (of which Peer Reviewed: 2 results)

  • [Journal Article] Mechanisms underlying ultraviolet radiation-induced dermal aging.2013

    • Author(s)
      Shigeo KAWADA, Satoshi NAKADA, YuheiMAKANAE.
    • Journal Title

      The Journal of PhysicalFitness and Sports Medicine

      Volume: 2(2) Pages: 225-228

    • URL

      http://www.jspfsm.umin.ne.jp/journal/index.htm

    • Peer Reviewed
  • [Journal Article] Suppression of UVB-induced HIF-1 α up-regulation by hyperoxia dose not prevent wrinkle formation associated with increased MMPs activity in mouse skin.2011

    • Author(s)
      Shigeo KAWADA and Naokata ISHII.
    • Journal Title

      Biomedical Research

      Volume: 32(6) Pages: 363-372

    • URL

      https://www.jstage.jst.go.jp/article/biomedres/32/6/32_6_363/_articl e

    • Peer Reviewed

URL: 

Published: 2014-09-25  

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