Medicine

Cancer drug for brain disorder?

Print edition : June 10, 2016

A schematic showing the stages of neurogenesis in the hippocampus and cell lineage-specific markers. Photo: Li et al., Science Translational Medicine (2016)

AN experimental cancer drug can improve learning and memory in mice with fragile X syndrome (FXS), according to a new study published in a recent issue of Science Translational Medicine. The findings offer new hope to patients with FXS, the most common cause of inherited intellectual disability and autism spectrum disorder, which currently lacks an effective treatment.

Mutations in the fragile X mental retardation (FMR1) gene lead to loss of FMRP, a protein that regulates the expression of many genes in neurons. FMRP deficiency is known to impair neural stem cells’ ability to generate new neurons in the adult brain, but how this occurs was not fully understood. Studying a mouse model of FXS, Yue Li and colleagues found that loss of FMRP led to greater activation of neural stem cells, enhancing their differentiation into astrocytes but not neurons. The researchers identified the enzyme MDM2 as a key target of FMRP in neural stem cells. FMRP deficiency led to greater MDM2 activity, resulting in enhanced neural stem cell proliferation but reduced differentiation.

A specific MDM2 inhibitor known as Nutlin, currently in an early clinical trial for retinoblastoma, seemed to correct this imbalance between neural stem cell proliferation and differentiation. Low doses of Nutlin restored spatial memory and learning in FMRP-deficient mice, opening the door to repurposing the drug as a potential treatment for FXS.

A letter from the Editor


Dear reader,

The COVID-19-induced lockdown and the absolute necessity for human beings to maintain a physical distance from one another in order to contain the pandemic has changed our lives in unimaginable ways. The print medium all over the world is no exception.

As the distribution of printed copies is unlikely to resume any time soon, Frontline will come to you only through the digital platform until the return of normality. The resources needed to keep up the good work that Frontline has been doing for the past 35 years and more are immense. It is a long journey indeed. Readers who have been part of this journey are our source of strength.

Subscribing to the online edition, I am confident, will make it mutually beneficial.

Sincerely,

R. Vijaya Sankar

Editor, Frontline

Support Quality Journalism
This article is closed for comments.
Please Email the Editor