According to the Law of Bergonie and Tribondeau, the most radiosensitive cells demonstrate which three of the following characteristics?

• A. Immature, Undifferentiated, High Reproductive Activity
• B. Mature, Differentiated, Low Reproductive Activity
• C. Immature, Differentiated, High Reproductive Activity
• D. Mature, Undifferentiated, High Reproductive Activity

Answer: (A)

Radiosensitivity rises with how much a cell is still dividing and how little it has differentiated. The Law of Bergonie and Tribondeau states that cells that are immature and undifferentiated, with a high rate of mitotic activity and a long future of divisions ahead, are the most radiosensitive. That’s because radiation mainly damages DNA, and cells that are actively dividing and not yet specialized have more opportunities for radiation to interfere with essential replication and repair processes. They also have less time and fewer mature defenses to recover from damage.

So the best description is immature, undifferentiated, with high reproductive activity. In contrast, mature, differentiated cells with low proliferative activity are more resistant because they divide less often and have more developed mechanisms to handle and repair DNA damage.