26. Cancer 2

TL;DR

Breakdown of growth and survival signaling, epithelial-to-mesenchymal transition, and actin cytoskeleton dynamics play a role in cancer development and tumor migration.

Transcript

ADAM MARTIN: So I guess I will start by, first of all, congratulating you all. Since the last time I've seen you, you've all regenerated your intestine. So it's like you're a brand new person. So there's that. I want to start the lecture by talking about something I've been putting off telling you about, which is the Nobel Prize in physiology or me... Read More

Key Insights

• 💨 James Allison and Tasuku Honjo received the Nobel Prize for discovering a way to enhance the immune system's ability to fight cancer.
• 🥺 Cancer is caused by a breakdown in growth and survival signaling, leading to uncontrolled cell division.
• 👻 Epithelial-to-mesenchymal transition (EMT) allows cancer cells to become more mobile and invade neighboring tissues.

Questions & Answers

Q: How did James Allison and Tasuku Honjo discover a way to harness the immune system to fight cancer?

Allison and Honjo discovered a technique that releases the brake on the immune system, allowing it to better fight cancer. This technique has been used in clinical trials for various cancer types.

Q: What are the barriers to tumor development and invasion?

The body has barriers such as apoptosis (programmed cell death) and a highly regulated system for determining cell division and survival. The immune system also presents a barrier by suppressing cancer cell activity.

Q: What is epithelial-to-mesenchymal transition (EMT) and how does it contribute to cancer?

EMT is a process where cancer cells become less adhesive and more migratory, resembling mesenchymal cells. This transition allows cancer cells to invade neighboring tissues and metastasize.

Q: How does the actin cytoskeleton play a role in cell migration?

The actin cytoskeleton generates force for cell migration by assembling and disassembling actin filaments, allowing the cell to extend protrusions and anchor to the substrate for movement.

Summary & Key Takeaways

• The Nobel Prize in Physiology or Medicine was awarded to James Allison and Tasuku Honjo for their discovery of a way to use the immune system to fight cancer.

• Cancer is caused by a breakdown in growth and survival signaling, allowing cells to divide uncontrollably.

• Epithelial-to-mesenchymal transition (EMT) occurs when cancer cells become more mobile by decreasing cell-to-cell adhesion and promoting migration.

• The actin cytoskeleton, a network of protein filaments, generates force for cell migration through the growth and stabilization of actin filaments.