Rat lung cancer induced by malathion and estrogen

  • Authors:
    • C. Echiburú-Chau
    • G. M. Calaf
  • View Affiliations

  • Published online on: September 1, 2008     https://doi.org/10.3892/ijo_00000046
  • Pages: 603-611
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Abstract

Lung cancer can originate from exposure to exogenous and endogenous environmental carcinogens. The use of organophosphorus insecticides has significantly increased in agricultural environments and in urban settings. There is evidence that estrogen can increase lung cancer risk in women. The aim of the present study was to analyze morphological and molecular alterations induced by malathion (M) and 17β-estradiol (E2) in rat lung tissues. There were four groups: saline solution (control) (100 µg/100 g body weight; BW), M (22 mg/100 g BW), E2 (30 µg/100 gr BW) and combination of both. The animals were injected over a 5-day period and sacrificed 240 days after treatments and lung tissues were excised and analyzed for morphological alterations. Morphometric analysis indicated that M plus E2-treated animals showed a significantly (P<0.05) higher incidence of parenchyma with alveolar proliferative lesions (PAPL), preneoplastic lesions in bronchiolar epithelium (hyperplasia, metaplasia, carcinoma in situ and invasive carcinoma) and atypical lymphatic morphology (lymphatic cell aggregates; LCA) than M or E2 alone-treated and control animals after 240 days. Molecular biology studies indicated that c-ErbB2 and Rho-A had higher protein expression in M plus E2-treated animals in comparison to control and either M- or E-treated animals. In summary, the combination of M and E2 sharply induced pathological lesions in lung alveolar parenchyma, bronchiolar epithelia and lymphatic tissues, in comparison to control animals or in animals treated with either substance alone. These results indicated an increase in risk of rodent lung tumor formation by environmental and endogenous substances.

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September 2008
Volume 33 Issue 3

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Echiburú-Chau C and Echiburú-Chau C: Rat lung cancer induced by malathion and estrogen. Int J Oncol 33: 603-611, 2008
APA
Echiburú-Chau, C., & Echiburú-Chau, C. (2008). Rat lung cancer induced by malathion and estrogen. International Journal of Oncology, 33, 603-611. https://doi.org/10.3892/ijo_00000046
MLA
Echiburú-Chau, C., Calaf, G. M."Rat lung cancer induced by malathion and estrogen". International Journal of Oncology 33.3 (2008): 603-611.
Chicago
Echiburú-Chau, C., Calaf, G. M."Rat lung cancer induced by malathion and estrogen". International Journal of Oncology 33, no. 3 (2008): 603-611. https://doi.org/10.3892/ijo_00000046