Month: June 2017

New Publication in Cell! The Phosphoregulation of Mitosis

Posted on Updated on

We are incredibly excited to announce that our SnapShot is out today in Cell!
This snapshot of mitosis collates hundreds of phosphorylation events and directly links them with their regulatory kinases and counterbalancing phosphatases, in both time and space, in a highly innovative ‘circtanglar’ cell layout. More importantly, the static PDF version is accompanied by an interactive website that enables users to access direct links to PubMed, UniProt, and Aquaria 3D protein structures for each and every phosphorylation event shown. The pop-up boxes also contain over 100 additional phosphorylation sites on dozens of proteins essential for mitosis. You can access the interactive web version here:  http://www.cell.com/cell/enhanced/odonoghue2
Even better news is that until August 04, 2017 the PDF version of the SnapShot is freely accessible for everyone at the following link https://authors.elsevier.com/a/1VDWh_278yyILK
A big thank-you to Jenny, Sam, Marcos and Sean for helping me put together what I hope will be an amazing resource for anyone interested in how cells divide and phosphorylation in general.

New Publication: Hedgehog signaling in small cell lung cancer

Posted on

Great news we have a new co-author publication in Oncogene!

This work was in collaboration with Prof. Neil Wakins here at the Garvan Institute and focuses on the role of Hedgehog (Hh)  signaling in small cell lung cancer (SCLC). Small cell lung cancer is a common, aggressive malignancy with universally poor prognosis.

Full details can be found here [link]

TITLE: “The role of canonical and non-canonical Hedgehog signaling in tumor progression in a mouse model of small cell lung cancer”

ABSTRACT:

Hedgehog (Hh) signaling regulates cell fate and self-renewal in development and cancer. Canonical Hh signaling is mediated by Hh ligand binding to the receptor Patched (Ptch), which in turn activates Gli-mediated transcription through Smoothened (Smo), the molecular target of the Hh pathway inhibitors used as cancer therapeutics. Small cell lung cancer (SCLC) is a common, aggressive malignancy with universally poor prognosis. Although preclinical studies have shown that Hh inhibitors block the self-renewal capacity of SCLC cells, the lack of activating pathway mutations have cast doubt over the significance of these observations. In particular, the existence of autocrine, ligand-dependent Hh signaling in SCLC has been disputed. In a conditional Tp53;Rb1 mutant mouse model of SCLC, we now demonstrate a requirement for the Hh ligand Sonic Hedgehog (Shh) for the progression of SCLC. Conversely, we show that conditional Shh overexpression activates canonical Hh signaling in SCLC cells, and markedly accelerates tumor progression. When compared to mouse SCLC tumors expressing an activating, ligand-independent Smo mutant, tumors overexpressing Shh exhibited marked chromosomal instability and Smoothened-independent upregulation of Cyclin B1, a putative non-canonical arm of the Hh pathway. In turn, we show that overexpression of Cyclin B1 induces chromosomal instability in mouse embryonic fibroblasts lacking both Tp53 and Rb1. These results provide strong support for an autocrine, ligand-dependent model of Hh signaling in SCLC pathogenesis, and reveal a novel role for non-canonical Hh signaling through the induction of chromosomal instability.