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Increase of free in...
Increase of free insulin-like growth factor-1 in normal human breast in vivo late in the menstrual cycle
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- Dabrosin, Charlotta, 1961- (författare)
- Östergötlands Läns Landsting,Linköpings universitet,Hälsouniversitetet,Onkologi,Onkologiska kliniken US
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(creator_code:org_t)
- 2003
- 2003
- Engelska.
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Ingår i: Breast Cancer Research and Treatment. - 0167-6806 .- 1573-7217. ; 80:2, s. 193-198
- Relaterad länk:
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https://urn.kb.se/re...
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visa fler...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Prolonged exposure to endogenous and exogenous sex steroids increases the risk of breast cancer but the mechanisms are poorly understood. Increased levels of circulating insulin-like growth factor-1 (IGF-1) and low levels of IGF binding protein are associated with increased risk of breast cancer suggesting that IGF-1 has to be in its free form to be biologically active. Little is known about sex steroid regulation of IGF-1 locally in the breast. In this study microdialysis was used to determine the local levels of free IGF-1 in normal human breast tissue in healthy female volunteers during the menstrual cycle. The results showed that the extracellular levels of free IGF-1 locally in the breast were doubled in the luteal phase, when estradiol and progesterone levels were elevated, compared with the follicular phase. In plasma, free IGF-1 levels also exhibited a cyclic variation but to a less extent. The increased local levels of the tree form of IGF-1 may promote proliferation in the breast epithelium. This could be important in sex steroid dependent breast cancer development.
Nyckelord
- MEDICINE
- MEDICIN
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