Question

Etoposide and Teniposide are the semi-synthetic derivatives of:

• A. Podophyllotoxin
• B. Digoxin
• C. Vincristine
• D. Taxol

Hint:

Podophyllotoxin is a precursor for the synthesis of key anticancer drugs like Etoposide and Teniposide, which work by inhibiting DNA synthesis in rapidly dividing cells.

Answer 1

The Correct Option is A

Etoposide and Teniposide are semi-synthetic derivatives of Podophyllotoxin, a natural compound derived from the Mayapple plant. These derivatives are used as chemotherapy agents, especially in the treatment of various cancers, such as testicular cancer and small cell lung cancer.

Answer 2

Etoposide and Teniposide are both chemotherapy drugs, and the question asks which natural compound they are semi-synthetically derived from. Tracing each drug back to its natural parent compound points to the answer.

1. Podophyllotoxin: This compound is extracted from the roots and rhizomes of Podophyllum plants (mayapple and Indian podophyllum). While podophyllotoxin itself is too toxic for direct clinical use, chemists modify it into glycoside derivatives, giving etoposide and teniposide, which retain anticancer activity with a better safety profile by inhibiting the enzyme topoisomerase II.
2. Digoxin: Digoxin is a cardiac glycoside obtained from Digitalis (foxglove) plants, used to treat heart failure and arrhythmias, an entirely different pharmacological class from these topoisomerase inhibiting anticancer drugs.
3. Vincristine: Vincristine is itself a vinca alkaloid extracted directly from the Catharanthus roseus plant. It is used as a chemotherapy agent, but it is a separate, direct natural product, not something etoposide and teniposide are derived from.
4. Taxol: Taxol (paclitaxel) comes from the bark of the Pacific yew tree and works by stabilising microtubules, a different mechanism and different plant source from the podophyllotoxin derived drugs.

Both etoposide and teniposide are made by chemically modifying podophyllotoxin extracted from Podophyllum plants, which is why this is their shared natural source.

Therefore, the correct answer is Podophyllotoxin.