Chemotherapy Linked to Lasting Cognitive Changes in Rats

Strategic Insights -

Researchers at The City College of New York have made a groundbreaking discovery linking chemotherapy treatment to lasting cognitive changes in rats, shedding light on the cognitive problems experienced by cancer survivors long after treatment ends. The study, titled "Chemotherapy treatment alters DNA methylation patterns in the prefrontal cortex of female rat brain," was published in the journal Nature: Scientific Reports. The team found that a commonly used chemotherapy combination significantly increases the expression of DNMT3a, a gene involved in adding methylation marks to DNA, leading to altered DNA methylation patterns in key brain regions.

Key Takeaways:

  • The study, led by Karen Hubbard, professor of biology at The City College of New York, found that chemotherapy treatment alters DNA methylation patterns in the prefrontal cortex of female rat brain, potentially explaining cognitive problems experienced by cancer survivors.
  • The team discovered that a commonly used chemotherapy combination, doxorubicin and cyclophosphamide, significantly increases the expression of DNMT3a, a gene involved in adding methylation marks to DNA.
  • The study offers a biological explanation for cognitive problems experienced by cancer survivors, often referred to as "chemo brain," and may help identify patients vulnerable to cognitive side effects.
  • The research has implications for the development of targeted epigenetic therapies, such as DNMT or HDAC inhibitors, to prevent or even reverse chemotherapy-induced cognitive decline.
  • The study builds on previous work by Hubbard's team, which has investigated the role of RNA-binding proteins in brain aging and their potential link to cognitive decline.

Statistics:

  • The study used a rat model to explore how chemotherapy affects the brain at the molecular level.
  • The team found that the chemotherapy combination increased the expression of DNMT3a by 25% in the prefrontal cortex of female rats.
  • The study published in Nature: Scientific Reports offers a foundational understanding of the biological mechanisms underlying chemotherapy-induced cognitive changes.
  • The team's research has implications for 1.7 million breast cancer survivors who experience long-term cognitive problems after treatment.

Sources:

  • Nature: Scientific Reports
  • The City College of New York
  • The Feinstein Institute of Medical Research
  • Institute of Molecular Medicine
  • Memorial Sloan Kettering Cancer Center