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Specific polypeptide differences in normal versus malignant human breast tissues by two-dimensional electrophoresis

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Summary

Postmitochondrial and cytosolic polypeptides were extracted from human breast tumors and non-malignant breast tissue and analyzed using high resolution two-dimensional polyacrylamide gel electrophoresis (2D-PAGE). Approximately 800–1000 postmitochondrial and 600–800 silver stained cytosolic polypeptides were detected over the pH range of 4.8 to 7.5 and molecular weight range of 18–120 kDa. The 2D-PAGE patterns of polypeptides from normal and malignant tissue were very similar, although both qualitative and quantitative polypeptide differences were noted. Six cytosolic polypeptides (pI/molecular weight × 10−3) 5.20/80 kDa, 5.75/43, 6.25/40, 5.43/35, 5.45/34.5, 5.50/34 and 6.15/24 were expressed only in malignant tissues. One constitutive polypeptide, 7.25/52, was not detected in any of the malignant tissue samples. Quantitatively, marked differences in spot density were noted in polypeptides localized mainly in the molecular weight ranges of 22–40 kDa and pI ranges of 5.65–7.00. A general increase in polypeptide expression was noted in malignant tissues as compared to normal. Twenty-two polypeptides were significantly and consistently increased in tumor samples while only one polypeptide was decreased. One polypeptide, p24 (6.15/24) was expressed in greatest concentrations in tumors which also expressed the greatest estrogen receptor content. Expression of p24 was markedly reduced in normal tissue and malignant tissues expressing low levels of estrogen and progesterone receptors.

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Authors and Affiliations

  1. Laboratory of Experimental Carcinogenesis, Division of Cancer Etiology, National Cancer Institute, Bldg. 37, Room 3C28, 20892, Bethesda, MD, USA

    Peter J. Wirth & Snorri S. Thorgeirsson

  2. Laboratory of Cell Biology, Department of Pathology, University Hospital of Iceland, Reykjavik, Iceland

    Valgardur Egilsson, Vilmundur Gudnason & Sigurdur Ingvarsson

Authors
  1. Peter J. Wirth
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  2. Valgardur Egilsson
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  3. Vilmundur Gudnason
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  4. Sigurdur Ingvarsson
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  5. Snorri S. Thorgeirsson
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Wirth, P.J., Egilsson, V., Gudnason, V. et al. Specific polypeptide differences in normal versus malignant human breast tissues by two-dimensional electrophoresis. Breast Cancer Res Tr 10, 177–189 (1987). https://doi.org/10.1007/BF01810581

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