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Interlobular and intralobular mammary stroma: genotype may not reflect phenotype

J M Fleming1, E L Long, E Ginsburg

  • 1Mammary Biology and Tumorigenesis Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA. flemingjo@mail.nih.gov

BMC Cell Biology
|August 20, 2008
PubMed

Insights

Mammary gland fibroblasts show similar gene expression but distinct protein patterns. This highlights the importance of studying gene regulation at both transcriptional and post-translational levels for understanding cell communication.

Area of Science:

  • Cell biology
  • Molecular biology
  • Cancer research

Background:

  • Mammary epithelial cell function relies on stromal fibroblast interactions.
  • Two distinct fibroblast subtypes exist in the human mammary gland: intralobular and interlobular.
  • Their differing proximity suggests unique functional roles.

Purpose of the Study:

  • To compare gene expression profiles of intralobular and interlobular fibroblasts.
  • To investigate potential functional differences between these stromal subtypes.

Main Methods:

  • Isolation of fibroblasts from normal breast tissue using laser capture microscopy.
  • Microarray analysis for global gene expression profiling.
  • Validation of findings using RT-PCR and immunohistochemistry.

Main Results:

  • No statistically significant differences were found in gene expression profiles between the two fibroblast subtypes.
  • Significant differences were observed in protein expression patterns for several tested genes.

Conclusions:

  • Gene expression profiles of intralobular and interlobular fibroblasts are similar.
  • Protein expression differences indicate distinct functions at the post-translational level.
  • Emphasizes the necessity of examining both transcriptional and post-translational regulation in gene studies.
Abstract

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