- ICH GCP
- US Clinical Trials Registry
- Klinisk forsøg NCT00864955
Cutaneous DNA Damage Caused by UV-A Irradiation (DIMUVA)
Damage to DNA Caused by UV-A Irradiation: Photochemical Mechanism and Cutaneous Parameters Involved in the Formation of Cyclobutane Pyrimidine Dimers
Studieoversigt
Status
Betingelser
Intervention / Behandling
Detaljeret beskrivelse
Due to their capacity to damage Deoxyribonucleic acid (DNA), Ultra-Violet (UV) radiation is one of the causes of skin cancers.
Until recently, the genotoxic effects of UV-A radiation, were poorly identified, in particular their capacity to lead to the dimerization of pyrimidine bases .
It is well known that the response to UV-A and UV-B radiations is different depending on the cutaneous phototype.
Thus, the aim of this study is to determine the correlation between cutaneous phototype and the quantity and nature (CPD or oxidative lesions) of damage caused to cutaneous DNA after an ex-vivo exposure to UV-A and UV-B radiations.
Undersøgelsestype
Tilmelding (Forventet)
Fase
- Ikke anvendelig
Kontakter og lokationer
Studiesteder
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Grenoble, Frankrig, 38043
- Centre d'investigation Clinique ,University Hospital Grenoble
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Grenoble, Frankrig, 38043
- Department of Dermatology, University Hospital Grenoble
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Deltagelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
Beskrivelse
Inclusion Criteria:
- Male,
- Between 18 and 35 years old,
- Healthy volunteers,
- Cutaneous phototype 2 or 4 according to the Fitzpatrick classification,
- Affiliation to the French Social Security.
Exclusion Criteria:
- History of photosensibility,
- Active smoking or stopped since less than one year,
- Dermatological pathology or treatment contra-indicating cutaneous irradiation and skin biopsies,
- Any chronic pathology susceptible to interfere with the evaluations related to the protocol,
- Allergy to local anaesthetics,
- Volunteers who take drugs and/or food complements acting on oxidative stress in the 8 weeks preceding inclusion,
- Volunteers who have take paracetamol or aspirin within 7 days prior to the inclusion visit,
- Subject in exclusion period for another biomedical research study,
- Subject having exceeded the threshold of annual compensation for biomedical research.
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Sundhedstjenesteforskning
- Tildeling: Ikke-randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Ingen (Åben etiket)
Våben og indgreb
Deltagergruppe / Arm |
Intervention / Behandling |
|---|---|
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Eksperimentel: phototype 2
Volunteers with cutaneous phototype 2
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Eksperimentel: phototype 4
Volunteers with cutaneous phototype 4
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Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Tidsramme |
|---|---|
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Phototype determination according to the Fitzpatrick classification Number of CPD and oxidative lesions determinated by the analysis of DNA from the skin biopsies after their ex-vivo exposure to UV-A - The CPD / Oxidative lesions ratio
Tidsramme: Day 0
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Day 0
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Sekundære resultatmål
Resultatmål |
Tidsramme |
|---|---|
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Number of CPD and oxidative lesions determinated by the analysis of DNA from the skin biopsies after their exposure ex-vivo to UV-B.
Tidsramme: Day 0
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Day 0
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UV-A radiation exposure: Minimal erythemic dose - Number of CPD and oxidative lesions - CPD / oxidative lesions ratio
Tidsramme: Day x
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Day x
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UV-B radiation exposure: Minimal erythemic dose - Number of CPD and oxidative lesions - CPD/oxidative lesions ratio
Tidsramme: Day 0
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Day 0
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antioxidant status and quantity of CPD, oxidative lesions after exposure to UV-A and UV-B radiations
Tidsramme: day 2
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day 2
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Samarbejdspartnere og efterforskere
Sponsor
Samarbejdspartnere
Efterforskere
- Ledende efterforsker: Jean-Claude BEANI, Pr, University Hospital, Grenoble
Publikationer og nyttige links
Generelle publikationer
- Brash DE. Sunlight and the onset of skin cancer. Trends Genet. 1997 Oct;13(10):410-4. doi: 10.1016/s0168-9525(97)01246-8.
- Melnikova VO, Ananthaswamy HN. Cellular and molecular events leading to the development of skin cancer. Mutat Res. 2005 Apr 1;571(1-2):91-106. doi: 10.1016/j.mrfmmm.2004.11.015.
- Cadet J, Sage E, Douki T. Ultraviolet radiation-mediated damage to cellular DNA. Mutat Res. 2005 Apr 1;571(1-2):3-17. doi: 10.1016/j.mrfmmm.2004.09.012. Epub 2005 Jan 26.
- Douki T, Reynaud-Angelin A, Cadet J, Sage E. Bipyrimidine photoproducts rather than oxidative lesions are the main type of DNA damage involved in the genotoxic effect of solar UVA radiation. Biochemistry. 2003 Aug 5;42(30):9221-6. doi: 10.1021/bi034593c.
- Dumaz N, Drougard C, Sarasin A, Daya-Grosjean L. Specific UV-induced mutation spectrum in the p53 gene of skin tumors from DNA-repair-deficient xeroderma pigmentosum patients. Proc Natl Acad Sci U S A. 1993 Nov 15;90(22):10529-33. doi: 10.1073/pnas.90.22.10529.
Datoer for undersøgelser
Studer store datoer
Studiestart
Primær færdiggørelse (Faktiske)
Studieafslutning (Faktiske)
Datoer for studieregistrering
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først opslået (Skøn)
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Nøgleord
Andre undersøgelses-id-numre
- DCIC 08 13
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