OBSTET-L Mensagens pela Março, 2001: Re: trabalhos interessantes X

Re: trabalhos interessantes X

From: Jaime

jaimen@zaz.com.br

Thu, 29 Mar 2001 21:59:54 -0300

Não é a luz solar, é a luz visível - captada pela retina, estimulando os centros nervosos e diminuindo os níveis do hormônio Melatonina produzido na glândula pineal.

-- Jaime

>----- Original Message ----- From: Anabel Scaranelo <anabelms@uol.com.br> To: Multiple recipients of list OBSTET-L <obstet-l@mail.medispecialty.com> Sent: Thursday, March 29, 2001 8:04 PM Subject: Re: trabalhos interessantes X

> Seria interessante fazer esta pesquisa com mulheres radiologistas ou que > trabalham nesse segmento (atendentes de enfermagem, técnicas de RX, > Ressonância), pois muitas vezes passamos umas boas 08 a 10 horas por dia > longe da luz do sol... > > At Wed, 28 Mar 2001, Jaime wrote: > > > > Aos colegas da lista > > > > Mulherese cegas ou parcialmente cegas têm menor risco de câncer de > >mama. > > > >Dr. J. Kliukiene e sua equipe, Noruega acompanharam 15.412 mulheres > >deficientes visuais, desde 1961 e descobriram que essas mulheres têm baixo > >risco para ca de mama. > > > >Isso reforça a "Hipótese da Melatonina": A luz visível diminui os niveis de > >Melatonina e os baixos níveis de Melatonina estariam associados a maior > >incidência de ca de mama. > > > >O trabalho foi publicado no British Journal of Cancer em 02 de fevereiro de > >2001. > > > >Mais detalhes: > > > >Risk of Breast Cancer Decreased in Blind Women > >--------------------------------------------------------------------------- - >--------------------------------------------------------------------------- > >---- >--------------------------------------------------------------------------- > >--------------------------------------------------------------------------- - >--------------------------------------------------------------------------- > > >--------------------------------------------------------------------------- > >--------------------------------------------------------------------------- - >--------------------------------------------------------------------------- > >WESTPORT, CT (Reuters Health) Mar 09 - Research conducted in Norway >--------------------------------------------------------------------------- > >indicates that totally blind women are at decreased risk for breast cancer, > >especially those who became blind before age 65 years. "Our findings give > >support to the 'melatonin hypothesis'," the researchers say, which > >postulates that melatonin has a protective effect against breast cancer. > > > >Dr. J. Kliukiene and colleagues, of the Cancer Registry of Norway, in Oslo, > >used data from the Norwegian Registry of Blindness to identify 15,412 > >visually impaired women. Of these, 396 were totally blind. > > > >Based on follow-up beginning in 1961 or at the onset of blindness, the > >standardized incidence ratio for breast cancer was 0.64 in totally blind > >women. For those blinded before age 65, the incidence ratio was 0.51, the > >investigators report in the British Journal of Cancer for February 2. > > > >There appeared to be no association between visual impairment short of total > >blindness and breast cancer, as illustrated by the standardized incidence > >ratio of 0.92 for those with moderate low vision and 1.21 for those with > >near-total blindness. > > > >According to the authors, experimental evidence shows that increased > >nocturnal exposure to visible light reduces melatonin levels and is > >associated with increased growth of breast cancer. Blind women who are not > >ocularly receptive to light may maintain melatonin production at night > >regardless of light exposure. Dr. Kliukiene's team suggests that this is the > >mechanism whereby these women are protected from breast cancer. > > > >Br J Cancer 2001;84:397-399. > > > >-- > > Jaime Nonato http://www.geocities.com/jjndo jaimen@zaz.com.br > > >

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