Related Experiment Videos
Human relaxins in normal, benign and neoplastic breast tissue
L S Tashima1, G Mazoujian, G D Bryant-Greenwood
1Pacific Biomedical Research Center, University of Hawaii, Honolulu 96822.
Journal of Molecular Endocrinology
|June 1, 1994
Summary
Human breast tissue synthesizes relaxin, with relaxin gene expression found in both normal and cancerous breast cells. This study demonstrates relaxin
Area of Science:
- Endocrinology
- Molecular Biology
- Oncology
Background:
- Relaxin, a hormone, is found in human breast cyst fluid and milk, suggesting local synthesis.
- Previous studies have not definitively localized relaxin within breast tissue or examined its gene expression.
- Understanding relaxin's role in breast tissue is crucial for both normal physiology and tumorigenesis.
Purpose of the Study:
- To immunolocalize relaxin in normal, benign, and neoplastic human breast tissues.
- To investigate the expression of human relaxin genes (H1 and H2) in these tissues.
- To determine if relaxin plays a role in breast cancer development.
Main Methods:
- Avidin-biotin immunostaining technique using monoclonal and polyclonal antibodies against human relaxin H2.
- RNA isolation, cDNA synthesis, and Polymerase Chain Reaction (PCR) to detect H1 and H2 relaxin gene expression.
- Southern analysis, restriction enzyme digestion, and sequencing for gene expression verification.
Main Results:
- Relaxin was immunolocalized to the cytoplasm of epithelial and myoepithelial cells in normal, benign, and neoplastic breast tissues.
- H1 relaxin gene expression was detected in 1/8 normal and 9/12 neoplastic breast samples.
- H2 relaxin gene expression was found in 3/8 normal and all 12 neoplastic breast samples, indicating higher expression in tumors.
Conclusions:
- The human breast is a site of relaxin synthesis and H1/H2 relaxin gene expression.
- Relaxin gene expression, particularly H2, is elevated in neoplastic breast tissues.
- These findings provide the first demonstration of cellular relaxin localization and gene expression in the breast, opening avenues for further research into relaxin's function in breast physiology and cancer.