In September 2016, Paola Scaffidi's research group at the Crick
reported in the journal Science that a key regulatory protein
histone H1.0 is often turned off in cancer cells. It appeared that
silencing H1.0 may be key to cancer cells' immortal properties.
Finding a way to reactivate production of this protein could
potentially lead to a new way to arrest tumor growth.
Paola and her group have a detailed knowledge of these
biological processes in cancer cells. Using the small molecule
library and high-throughput screening (HTS) facility available
in-house at the Crick, she has screened several thousand small
molecules to try and unlock the mechanisms that control H1.0
production. Working with chemists at AstraZeneca, Paola has
analysed data from the screen.
This microscopic image of a breast cancer cell
shows H1.0 in red, cancer cells have variable levels of the
histone.She says her team and the AstraZeneca chemists take
complementary approaches to handling the results.
"I think about physiological effect, and the question 'will the
molecule affect the behavior of cancer cells?'" says Paola. "The
Discovery Sciences team at AstraZeneca focuses on the biological
target and the question 'which specific protein are you targeting
with the molecules - or hits - identified in the screen?'"
It has been useful for me to work together and merge the two
approaches to handle the results."
In the future, the AstraZeneca team may also support the project
by supplying new compounds that are structurally similar to hits
identified in the screen in order to validate them.
The collaboration is still in the early stages. But if screening
does reveal a molecule of interest, the team will test it in vivo
in animal models of cancer. Paola's ultimate goal is to determine
whether pharmacological modulation of H1.0 can restore normal
levels of the protein and so halt tumour growth.