NDLI: Isoform 1 of TPD52 (PC-1) promotes neuroendocrine transdifferentiation in prostate cancer cells

Content Provider	Springer Nature Link
Author	Moritz, Tom Venz, Simone Junker, Heike Kreuz, Sarah Walther, Reinhard Zimmermann, Uwe
Copyright Year	2016
Abstract	The tumour protein D52 isoform 1 (PC-1), a member of the tumour protein D52 (TPD52) protein family, is androgen-regulated and prostate-specific expressed. Previous studies confirmed that PC-1 contributes to malignant progression in prostate cancer with an important role in castration-resistant stage. In the present work, we identified its impact in mechanisms leading to neuroendocrine (NE) transdifferentiation. We established for long-term PC-1 overexpression an inducible expression system derived from the prostate carcinoma cell line LNCaP. We observed that PC-1 overexpression itself initiates characteristics of neuroendocrine cells, but the effect was much more pronounced in the presence of the cytokine interleukin-6 (IL-6). Moreover, to our knowledge, this is the first report that treatment with IL-6 leads to a significant upregulation of PC-1 in LNCaP cells. Other TPD52 isoforms were not affected. Proceeding from this result, we conclude that PC-1 overexpression enhances the IL-6-mediated differentiation of LNCaP cells into a NE-like phenotype, noticeable by morphological changes and increased expression of typical NE markers, like chromogranin A, synaptophysin or beta-3 tubulin. Immunofluorescent staining of IL-6-treated PC-1-overexpressing LNCaP cells indicates a considerable PC-1 accumulation at the end of the long-branched neuron-like cell processes, which are typically formed by NE cells. Additionally, the experimentally initiated NE transdifferentiation correlates with the androgen receptor status, which was upregulated additively. In summary, our data provide evidence for an involvement of PC-1 in NE transdifferentiation, frequently associated with castration resistance, which is a major therapeutic challenge in the treatment of advanced prostate cancer.
Starting Page	10435
Ending Page	10446
Page Count	12
File Format	PDF
ISSN	10104283
Journal	Tumor Biology
Volume Number	37
Issue Number	8
e-ISSN	14230380
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-02-05
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	PC-1 PrLZ TPD52 Neuroendocrine transdifferentiation Prostate cancer LNCaP Cancer Research
Content Type	Text
Resource Type	Article
Subject	Medicine Cancer Research

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