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Correlation between vascular endothelial growth factor and leptin in normal human breast tissue in vivo
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för kliniska vetenskaper. Linköpings universitet, Hälsouniversitetet.
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för kliniska vetenskaper. Linköpings universitet, Hälsouniversitetet.
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för kliniska vetenskaper. Linköpings universitet, Hälsouniversitetet. Region Östergötland, Barn- och kvinnocentrum, Kvinnokliniken i Linköping.ORCID-id: 0000-0001-5702-4116
Linköpings universitet, Institutionen för klinisk och experimentell medicin, Avdelningen för kliniska vetenskaper. Linköpings universitet, Hälsouniversitetet. Östergötlands Läns Landsting, Centrum för kirurgi, ortopedi och cancervård, Onkologiska kliniken US.
2015 (engelsk)Manuskript (preprint) (Annet vitenskapelig)
Abstract [en]

Introduction: Events in the microenvironment are important for carcinogenesis of the breast. Adipocytes, which produce adipokines with paracrine effects, are the most abundant cell type in breast tissue. Exposure to sex steroids affects the risk of breast cancer. It has previously been shown that estrogen regulates the extracellular levels of leptin, adiponectin, IL-1β, and VEGF in normal human breast tissue in vivo.

Objective: We aimed to determine if there were any relationships between leptin, adiponectin, IL-1β, and/or VEGF in normal human breast tissue in vivo and to elucidate the role of adipocytes in the regulation of these factors.

Design and methods: Microdialysis was used to sample proteins of normal human breast tissue and abdominal subcutaneous (s.c.) fat in situ in pre-and postmenopausal women. An in vitro co-culture model of breast cancer cells and primary mature human adipocytes was used.

Results: In vivo, in normal breast tissue, significant positive correlations between VEGF and leptin, and VEGF and leptin/adiponectin ratio were detected. No correlations were found in s.c. abdominal fat tissue. Co-culture of adipocytes and breast cancer cells per se increased the secretion of VEGF and leptin and enhanced the effects of estradiol compared to culture of either cell type alone. In vitro, inhibition of VEGF diminished the release of leptin while inhibition of leptin had no influence on VEGF secretion. In breast tissue, significant correlations between IL-1β and leptin and VEGF were revealed.

Conclusions: Our results suggest that VEGF regulates leptin in normal human breast tissue. Moreover, physical contact between adipocytes and breast cancer cells, induces phenotypic changes and enhances the effects of estradiol. These mechanisms may be involved in breast cancer progression.

sted, utgiver, år, opplag, sider
2015.
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-117982OAI: oai:DiVA.org:liu-117982DiVA, id: diva2:812639
Tilgjengelig fra: 2015-05-19 Laget: 2015-05-19 Sist oppdatert: 2019-06-28bibliografisk kontrollert
Inngår i avhandling
1. Hormonal regulation of immune modulators in human breast tissue
Åpne denne publikasjonen i ny fane eller vindu >>Hormonal regulation of immune modulators in human breast tissue
2015 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Breast cancer is the most common form of cancer and the second leading cause of malignancy-associated death in women worldwide. Estrogens are the main sex hormones in women. They are essential for the development and function of normal breast mammary glands; however, prolonged exposure to estrogens increases the risk of breast cancer development and progression. Approximately two-thirds of all breast cancer patients are positive for estrogen receptor (ER), but only 50% of those cases can benefit from antiestrogen therapy.

In this thesis we investigated the effects of estrogen, diet modification, and anti-estrogen drugs on several immune modulators in normal human breast tissue. We used the microdialysis technique to sample the immune modulators in situ in normal human breast tissue, in malignant breast tissue, and in tumor tissue from both the immune competent mice with murine breast cancer and immune deficient mice bearing human breast tumors. Furthermore, we also used ex vivo culture of normal breast tissue and in vitro cell culture of breast cancer cell lines. A combined cell culture (co-culture) of breast cancer cell lines, together with the primary mature adipocytes, was also used in this thesis.

In Paper I and Paper II, our results suggested that estrogen exerted both proinflammatory and pro-tumorigenic effects in normal human breast tissue. Estradiol increased extracellular interleukin-1β (IL-1β) and leptin levels and decreased IL-1Ra and adiponectin levels in normal human breast tissue. In contrast, tamoxifen decreased IL-1β and leptin levels and increased IL-1Ra and adiponectin levels, shifting the environment towards an antiinflammatory and antitumorigenic state. Diet modification with flaxseed for 30 days also increased IL-1Ra levels, creating an anti-inflammatory environment in normal breast tissue. In the breast cancer tissue, we found that extracellular IL-1β levels and leptin levels were significantly higher, whereas adiponectin levels were significantly lower, compared with normal adjacent breast tissue, which suggested a more proinflammatory state.

In the third paper, our in vivo investigation of normal breast tissue revealed significant correlations between vascular endothelial growth factor (VEGF) and leptin, IL-1β and leptin, and between VEGF and IL-1β. No correlations were found in the abdominal subcutaneous (s.c.) fat tissue. Our in vitro inhibition experiments suggested that VEGF was a potent regulator of leptin, but that leptin was not a potent regulator of VEGF. Co-culture per se altered the release of VEGF and leptin and enhanced the effects of estradiol, compared with monocultures of the included cell types.

In conclusion, the results presented in this thesis will increase the overall understanding of the role of estrogens in breast cancer, which may be useful in future treatment studies.

sted, utgiver, år, opplag, sider
Linköping: Linköping University Electronic Press, 2015. s. 70
Serie
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1461
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-117983 (URN)10.3384/diss.diva-117983 (DOI)978-91-7519-055-6 (ISBN)
Disputas
2015-06-05, Linden, Campus US, Linköping, 09:00 (svensk)
Opponent
Veileder
Forskningsfinansiär
Swedish Cancer SocietySwedish Research CouncilLinköpings universitet
Tilgjengelig fra: 2015-05-19 Laget: 2015-05-19 Sist oppdatert: 2019-11-15bibliografisk kontrollert

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