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Lymphoma

Hedgehog signaling pathway is activated in diffuse large B-cell lymphoma and contributes to tumor cell survival and proliferation

Leukemia volume 24, pages 1025–1036 (2010)Cite this article

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Abstract

Hedgehog (HH) signaling is important in the pathogenesis of several malignancies. Recently, we described that HH signaling proteins are commonly expressed in diffuse large B-cell lymphoma (DLBCL); however, the functional role of HH pathway in DLBCL has not been explored. Here, we assessed the possibility that HH pathway activation contributes to the survival of DLBCL. We found that HH signaling inhibition induces predominantly cell-cycle arrest in DLBCL cells of germinal center (GC) B-cell type, and apoptosis in DLBCL cells of activated B-cell (ABC) type. Apoptosis after HH signaling inhibition in DLBCL cells of ABC type was associated with downregulation of BCL2; however HH inhibition was not associated with BCL2 downregulation in DLBCL of GC type. Functional inhibition of BCL2 significantly increased apoptosis induced by HH inhibition in DLBCL cells of both types. We also showed that DLBCL cells synthesize, secrete and respond to endogenous HH ligands, providing support for the existence of an autocrine HH signaling loop. Our findings provide novel evidence that dysregulation of HH pathway is involved in the biology of DLBCL and have significant therapeutic implications as they identify HH signaling as a potential therapeutic target in DLBCL, in particular for those lymphomas expressing the HH receptor smoothened.

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Acknowledgements

We thank Professor Michael G Rosenblum Department of Experimental Therapeutics and Dr Felipe Samaniego, Department of Lymphoma and Myeloma, MD Anderson Cancer Center for providing cell lines. This research was supported by funds from the University Cancer Foundation (Institutional Research Grant) at The University of Texas MD Anderson Cancer Center (to FV), from the CLL Global Research Foundation (to FV) and from the Wendy Will Case Cancer Foundation (to RRS).

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Authors and Affiliations

  1. Department of Hematopathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA

    R R Singh, J E Kim, Y Davuluri, E Drakos, J H Cho-Vega, H M Amin & F Vega

  2. St. Joseph Dermatopathology, Houston, TX, USA.,

    J H Cho-Vega

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  1. R R Singh
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Correspondence to F Vega.

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Singh, R., Kim, J., Davuluri, Y. et al. Hedgehog signaling pathway is activated in diffuse large B-cell lymphoma and contributes to tumor cell survival and proliferation. Leukemia 24, 1025–1036 (2010). https://doi.org/10.1038/leu.2010.35

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