ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

Hits per page

hits 1 - 4 | 4 hits

Sorting

Unknown

Blocking PGE2-induced tumour repopulation abrogates bladder cancer chemoresistance (2014)

A. V. Kurtova ; J. Xiao ; Q. Mo ; [et al.]

Nature Publishing Group (NPG)

In: Nature. 517(7533): 209-13. doi: 10.1038/nature14034.

add to mindlist on the mindlist

Details

Publication Date: 2014-12-04

Description: Cytotoxic chemotherapy is effective in debulking tumour masses initially; however, in some patients tumours become progressively unresponsive after multiple treatment cycles. Previous studies have demonstrated that cancer stem cells (CSCs) are selectively enriched after chemotherapy through enhanced survival. Here we reveal a new mechanism by which bladder CSCs actively contribute to therapeutic resistance via an unexpected proliferative response to repopulate residual tumours between chemotherapy cycles, using human bladder cancer xenografts. Further analyses demonstrate the recruitment of a quiescent label-retaining pool of CSCs into cell division in response to chemotherapy-induced damages, similar to mobilization of normal stem cells during wound repair. While chemotherapy effectively induces apoptosis, associated prostaglandin E2 (PGE2) release paradoxically promotes neighbouring CSC repopulation. This repopulation can be abrogated by a PGE2-neutralizing antibody and celecoxib drug-mediated blockade of PGE2 signalling. In vivo administration of the cyclooxygenase-2 (COX2) inhibitor celecoxib effectively abolishes a PGE2- and COX2-mediated wound response gene signature, and attenuates progressive manifestation of chemoresistance in xenograft tumours, including primary xenografts derived from a patient who was resistant to chemotherapy. Collectively, these findings uncover a new underlying mechanism that models the progressive development of clinical chemoresistance, and implicate an adjunctive therapy to enhance chemotherapeutic response of bladder urothelial carcinomas by abrogating early tumour repopulation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4465385/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4465385/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kurtova, Antonina V -- Xiao, Jing -- Mo, Qianxing -- Pazhanisamy, Senthil -- Krasnow, Ross -- Lerner, Seth P -- Chen, Fengju -- Roh, Terrence T -- Lay, Erica -- Ho, Philip Levy -- Chan, Keith Syson -- AI036211/AI/NIAID NIH HHS/ -- CA125123/CA/NCI NIH HHS/ -- CA129640/CA/NCI NIH HHS/ -- CA175397/CA/NCI NIH HHS/ -- R00 CA129640/CA/NCI NIH HHS/ -- R01 CA175397/CA/NCI NIH HHS/ -- RR024574/RR/NCRR NIH HHS/ -- England -- Nature. 2015 Jan 8;517(7533):209-13. doi: 10.1038/nature14034. Epub 2014 Dec 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Department of Molecular &Cellular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA [2] Program in Translational Biology and Molecular Medicine, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA. ; Department of Molecular &Cellular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA. ; Dan L Duncan Cancer Center and Center for Cell Gene &Therapy, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA. ; Scott Department of Urology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA. ; 1] Department of Molecular &Cellular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA [2] Summer Medical and Research Training (SMART) Program, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA. ; 1] Department of Molecular &Cellular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA [2] Program in Translational Biology and Molecular Medicine, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA [3] Dan L Duncan Cancer Center and Center for Cell Gene &Therapy, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA [4] Scott Department of Urology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25470039" target="_blank"〉PubMed〈/a〉

Keywords: Animals ; Antibodies, Neutralizing/immunology/pharmacology ; Apoptosis/drug effects ; Celecoxib ; Cell Proliferation/drug effects ; Cyclooxygenase 2/metabolism ; Cyclooxygenase 2 Inhibitors/pharmacology ; Dinoprostone/*antagonists & inhibitors/immunology/metabolism/secretion ; Drug Resistance, Neoplasm/*drug effects ; Female ; Humans ; Male ; Mice ; Neoplastic Stem Cells/*drug effects/metabolism/*pathology ; Pyrazoles/pharmacology ; Signal Transduction/drug effects ; Sulfonamides/pharmacology ; Urinary Bladder Neoplasms/*drug therapy/*pathology ; Wound Healing/genetics ; Xenograft Model Antitumor Assays

Print ISSN: 0028-0836

Electronic ISSN: 1476-4687

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Published by Nature Publishing Group (NPG)

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

PAPER CURRENT

S·F·X

Fulltext

Unknown

The RNA-binding protein Rbfox1 regulates splicing required for skeletal muscle structure and function (2015)

Pedrotti, S., Giudice, J., Dagnino-Acosta, A., Knoblauch, M., Singh, R. K., Hanna, A., Mo, Q., Hicks, J., Hamilton, S., Cooper, T. A.

Oxford University Press

In: Human Molecular Genetics

add to mindlist on the mindlist

Details

Publication Date: 2015-03-20

Description: The Rbfox family of RNA-binding proteins is highly conserved with established roles in alternative splicing (AS) regulation. High-throughput studies aimed at understanding transcriptome remodeling have revealed skeletal muscle as displaying one of the largest number of AS events. This finding is consistent with requirements for tissue-specific protein isoforms needed to sustain muscle-specific functions. Rbfox1 is abundant in vertebrate brain, heart and skeletal muscle. Genome-wide genetic approaches have linked the Rbfox1 gene to autism, and a brain-specific knockout mouse revealed a critical role for this splicing regulator in neuronal function. Moreover, a Caenorhabditis elegans Rbfox1 homolog regulates muscle-specific splicing. To determine the role of Rbfox1 in muscle function, we developed a conditional knockout mouse model to specifically delete Rbfox1 in adult tissue. We show that Rbfox1 is required for muscle function but a 〉70% loss of Rbfox1 in satellite cells does not disrupt muscle regeneration. Deep sequencing identified aberrant splicing of multiple genes including those encoding myofibrillar and cytoskeletal proteins, and proteins that regulate calcium handling. Ultrastructure analysis of Rbfox1 –/– muscle by electron microscopy revealed abundant tubular aggregates. Immunostaining showed mislocalization of the sarcoplasmic reticulum proteins Serca1 and Ryr1 in a pattern indicative of colocalization with the tubular aggregates. Consistent with mislocalization of Serca1 and Ryr1, calcium handling was drastically altered in Rbfox1 –/– muscle. Moreover, muscle function was significantly impaired in Rbfox1 –/– muscle as indicated by decreased force generation. These results demonstrate that Rbfox1 regulates a network of AS events required to maintain multiple aspects of muscle physiology.

Print ISSN: 0964-6906

Electronic ISSN: 1460-2083

Topics: Biology , Medicine