The small GTPase RhoA has greater expression in small cell lung carcinoma than in non-small cell lung carcinoma and contributes to their unique morphologies

  • Authors:
    • Kimberly A. Varker
    • Scott H. Phelps
    • Marina M. King
    • Carol L. Williams
  • View Affiliations

  • Published online on: March 1, 2003     https://doi.org/10.3892/ijo.22.3.671
  • Pages: 671-681
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Abstract

The two major forms of lung carcinoma, small cell lung carcinoma (SCLC) and non-small cell lung carcinoma (NSCLC), are clinically distinct, and are also differentiated by morphology and behavior in culture. SCLC cells have a greater metastatic potential than NSCLC cells in vivo, and exhibit a unique spherical morphology in culture due to their inability to adhere and spread on the substratum. Because the small GTPase RhoA affects metastatic properties and regulates cell morphology, we examined whether differences in RhoA expression and activity contribute to the distinct SCLC and NSCLC phenotypes. We found that the expression and GTPγS-dependent activation of RhoA are generally greater in SCLC cell lines (SCC-9, NCI-H69, NCI-H146, and NCI-H345) than in NSCLC cell lines (NCI-H23, NCI-H157, NCI-H520, and NCI-H522). The effects of inhibiting Rho-mediated signaling in these cells were investigated by transfecting the cells with cDNA coding for C3 exoenzyme, which ADP-ribosylates and inactivates Rho. Expression of C3 exoenzyme in SCLC cells induces cell-cell compaction, and causes NCI-H345 cells to adhere and spread on collagen IV. In contrast, expression of C3 exoenzyme in NSCLC cells does not induce detectable compaction, but induces cell spreading of NCI-H23 and NCI-H157 cells. Cell proliferation is diminished by Rho inactivation in the majority of the NSCLC cell lines, but not the SCLC cell lines. Expression of p21Cip1/WAF1 is also diminished by Rho inactivation in two of the SCLC cell lines, but is not significantly altered in the NSCLC lines. These results indicate that Rho-mediated signaling may regulate different events in SCLC and NSCLC cells, including adhesion of SCLC cells and proliferation of NSCLC cells.

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March 2003
Volume 22 Issue 3

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

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Spandidos Publications style
Varker KA, Phelps SH, King MM and Williams CL: The small GTPase RhoA has greater expression in small cell lung carcinoma than in non-small cell lung carcinoma and contributes to their unique morphologies. Int J Oncol 22: 671-681, 2003.
APA
Varker, K.A., Phelps, S.H., King, M.M., & Williams, C.L. (2003). The small GTPase RhoA has greater expression in small cell lung carcinoma than in non-small cell lung carcinoma and contributes to their unique morphologies. International Journal of Oncology, 22, 671-681. https://doi.org/10.3892/ijo.22.3.671
MLA
Varker, K. A., Phelps, S. H., King, M. M., Williams, C. L."The small GTPase RhoA has greater expression in small cell lung carcinoma than in non-small cell lung carcinoma and contributes to their unique morphologies". International Journal of Oncology 22.3 (2003): 671-681.
Chicago
Varker, K. A., Phelps, S. H., King, M. M., Williams, C. L."The small GTPase RhoA has greater expression in small cell lung carcinoma than in non-small cell lung carcinoma and contributes to their unique morphologies". International Journal of Oncology 22, no. 3 (2003): 671-681. https://doi.org/10.3892/ijo.22.3.671