American Association for Cancer Research
00085472can133176-sup-fig3.pdf (263.43 kB)

Supplementary Figure 3 from CLPTM1L Promotes Growth and Enhances Aneuploidy in Pancreatic Cancer Cells

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journal contribution
posted on 2023-03-30, 22:09 authored by Jinping Jia, Allen D. Bosley, Abbey Thompson, Jason W. Hoskins, Adam Cheuk, Irene Collins, Hemang Parikh, Zhen Xiao, Kris Ylaya, Marta Dzyadyk, Wendy Cozen, Brenda Y. Hernandez, Charles F. Lynch, Jadranka Loncarek, Sean F. Altekruse, Lizhi Zhang, Christopher J. Westlake, Valentina M. Factor, Snorri Thorgeirsson, William R. Bamlet, Stephen M. Hewitt, Gloria M. Petersen, Thorkell Andresson, Laufey T. Amundadottir

PDF file - 279KB, Co-localization of CLPTM1L mutants (CLPTM1L-delta-Cterm and CLPTM1L-delta-Loop) with an ER marker, indicating a similar localization for WT and mutant CLPTM1L proteins to the endoplasmic reticulum.



Genome-wide association studies (GWAS) of 10 different cancers have identified pleiotropic cancer predisposition loci across a region of chromosome 5p15.33 that includes the TERT and CLPTM1L genes. Of these, susceptibility alleles for pancreatic cancer have mapped to the CLPTM1L gene, thus prompting an investigation of the function of CLPTM1L in the pancreas. Immunofluorescence analysis indicated that CLPTM1L localized to the endoplasmic reticulum where it is likely embedded in the membrane, in accord with multiple predicted transmembrane domains. Overexpression of CLPTM1L enhanced growth of pancreatic cancer cells in vitro (1.3–1.5–fold; PDAY7 < 0.003) and in vivo (3.46-fold; PDAY68 = 0.039), suggesting a role in tumor growth; this effect was abrogated by deletion of two hydrophilic domains. Affinity purification followed by mass spectrometry identified an interaction between CLPTM1L and non-muscle myosin II (NMM-II), a protein involved in maintaining cell shape, migration, and cytokinesis. The two proteins colocalized in the cytoplasm and, after treatment with a DNA-damaging agent, at the centrosomes. Overexpression of CLPTM1L and depletion of NMM-II induced aneuploidy, indicating that CLPTM1L may interfere with normal NMM-II function in regulating cytokinesis. Immunohistochemical analysis revealed enhanced staining of CLPTM1L in human pancreatic ductal adenocarcinoma (n = 378) as compared with normal pancreatic tissue samples (n = 17; P = 1.7 × 10−4). Our results suggest that CLPTM1L functions as a growth-promoting gene in the pancreas and that overexpression may lead to an abrogation of normal cytokinesis, indicating that it should be considered as a plausible candidate gene that could explain the effect of pancreatic cancer susceptibility alleles on chr5p15.33. Cancer Res; 74(10); 2785–95. ©2014 AACR.

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