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Significance of α9β1 and αvβ6 integrin expression in breast carcinoma

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Abstract

Background

Both α9β1 and αvβ6 integrins have been newly identified from the tracheal epithelium of guinea pig. It has been pointed out that α9β1 functions as a receptor for tenascin-C and osteopontin. As for the ligands of αvβ6, fibronectin and tenascin-C have been identified. It has not been ascertained whether α9β1 and αvβ6 are expressed in normal breast tissue, benign breast lesion or breast carcinoma.

Methods

Immunohistochemical staining for α9β1 and αvβ6 was performed in benign breast lesion and breast carcinoma specimens. Western blotting was carried out on 11 breast carcinoma cases.

Results

α9β1 was expressed in the cytoplasm of carcinoma cells in 23 of 90 cases (26%) and αvβ6 in the membrane of carcinoma cells in 16 of 90 cases (18%). However, these findings of α9β1 and αvβ6 did not correlate with any clinicopathological factors including the patients’ age, tumor size, histological type of carcinoma, location of carcinoma cells and hormone receptor status. With regard to the histological grade of carcinoma, αvβ6 and α9β1 expression did not statistically correlate, although no expression of αvβ6 was observed in 14 cases of Grade I. On Western-blott analysis strong and weak bands consistent with αvβ6 were noted in the membrane fraction extracted from breast carcinoma cells. On the other hand weak bands consistent with α9 subunit were noted in the whole cell lysates of breast carcinoma cells and very weak or no bands consistent with α9 subunit were noted in the membrane fraction extracted from the breast carcinoma cells.

Conclusions

Significance of α9β1 and αvβ6 integrins expression in breast carcinoma was still unknown on clinicopathological examination. The findings of Western blot analysis may indicate that the transportation system of glycoproteins such as integrins to the cell membrane of carcinoma cells is disturbed, although these integrins can be produced.

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Abbreviations

kDa:

Kilodalton

ER:

Estrogen receptor

PgR:

Progesterone receptor

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Authors and Affiliations

  1. Second Department of Pathology, Hiroshima University School of Medicine, Japan

    Koji Arihiro, Mayumi Kaneko, Satoshi Fujii & Kouki Inai

  2. Department of Pathology, Kure National Hospital/Chugoku District Cancer Center, Japan

    Koji Arihiro

  3. Department of Internal Medicine, National Hiroshima Hospital, Japan

    Yasuyuki Yokosaki

Authors
  1. Koji Arihiro
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  2. Mayumi Kaneko
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  3. Satoshi Fujii
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  4. Kouki Inai
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  5. Yasuyuki Yokosaki
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Arihiro, K., Kaneko, M., Fujii, S. et al. Significance of α9β1 and αvβ6 integrin expression in breast carcinoma. Breast Cancer 7, 19–26 (2000). https://doi.org/10.1007/BF02967183

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  • DOI: https://doi.org/10.1007/BF02967183

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