All-trans-retinoic acid antagonizes the Hedgehog pathway by inducing patched.

Abstract:

:Male germ cell tumors (GCTs) are a model for a curable solid tumor. GCTs can differentiate into mature teratomas. Embryonal carcinomas (ECs) represent the stem cell compartment of GCTs and are the malignant counterpart to embryonic stem (ES) cells. GCTs and EC cells are useful to investigate differentiation therapy and chemotherapy response. This study explored mechanistic interactions between all-trans-retinoic acid (RA), which induces differentiation of EC and ES cells, and the Hedgehog (Hh) pathway, a regulator of self-renewal and proliferation. RA was found to induce mRNA and protein expression of Patched 1 (Ptch1), the Hh ligand receptor and negative regulator of this pathway. PTCH1 is also a target gene of Hh signaling through Smoothened (Smo) activation. Yet, this observed RA-mediated Ptch1 induction was independent of Smo. It occurred despite co-treatment with RA and Smo inhibitors. Retinoid induction of Ptch1 also occurred in other RA-responsive cancer cell lines and in normal ES cells. Notably, this enhanced Ptch1 expression was preceded by induction of the homeobox transcription factor Meis1, a direct RA target. Direct interaction between Meis1 and Ptch1 was confirmed using chromatin immunoprecipitation assays. To establish the translational relevance of this work, Ptch1 expression was shown to be deregulated in human ECs relative to mature teratoma and the normal seminiferous tubule. Taken together, these findings reveal a previously unrecognized mechanism through which RA can inhibit the Hh pathway via Ptch1 induction. Engaging this pathway is a new way to repress the Hh pathway that can be translated into the cancer clinic.

journal_name

Cancer Biol Ther

journal_title

Cancer biology & therapy

authors

Busch AM,Galimberti F,Nehls KE,Roengvoraphoj M,Sekula D,Li B,Guo Y,Direnzo J,Fiering SN,Spinella MJ,Robbins DJ,Memoli VA,Freemantle SJ,Dmitrovsky E

doi

10.4161/cbt.27821

subject

Has Abstract

pub_date

2014-04-01 00:00:00

pages

463-72

issue

4

eissn

1538-4047

issn

1555-8576

pii

27821

journal_volume

15

pub_type

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