How does camptothecin cause DNA damage?

The camptothecin-derived agents exert their antitumor activities by specifically stabilizing the Top1–DNA covalent complexes (Top1cc) and blocking the DNA religation step. When exposed to these DNA damage agents, tumor cells quickly activate DNA damage response.

What does camptothecin do to DNA?

Camptothecin induces DNA strand breaks and is cytotoxic in stimulated normal lymphocytes.

What does camptothecin do to cells?

Camptothecin analogs exhibit toxic effects against cancer cells by inducing the activation of apoptotic caspases and formation of ROS (Wenzel et al., 2004; Xia et al., 2005). Glioblastoma cells exposed to camptothecin exhibit activation of caspase-3, -8, and -9 (Xia et al., 2005).

How does chemotherapy damage DNA?

Abstract. Chemotherapeutics target rapidly dividing cancer cells by directly or indirectly inducing DNA damage. Upon recognizing DNA damage, cells initiate a variety of signaling pathways collectively referred to as the DNA damage response (DDR).

What does mismatch repair do?

Mismatch repair is a process that corrects mismatched nucleotides in the otherwise complementary paired DNA strands, arising from DNA replication errors and recombination, as well as from some types of base modifications.

How does non homologous end joining work?

Non-homologous end joining (NHEJ) is a pathway that repairs double-strand breaks in DNA. NHEJ is referred to as “non-homologous” because the break ends are directly ligated without the need for a homologous template, in contrast to homology directed repair, which requires a homologous sequence to guide repair.

What class of drug is camptothecin?

Drug type: Irinotecan is an anti-cancer (“antineoplastic” or “cytotoxic”) chemotherapy drug. This medication is classified as a “plant alkaloid” and “topoisomerase I inhibitor.” (For more detail, see “How this drug works” section below).

Is camptothecin toxic?

Abstract. Camptothecin is a specific topoisomerase I poison and is highly cytotoxic to eukaryotic cells.

What is DNA damage?

DNA damage is defined as any modification of DNA that changes its coding properties or normal function in transcription or replication (1, 9).

What are the types of DNA damage?

DNA damage can be subdivided into two types: (1) endogenous damage caused by reactive oxygen species (ROS) that are derived from metabolic byproducts and (2) exogenous damage caused by radiation (UV, X-ray, gamma), hydrolysis, plant toxins, and viruses.

What is the difference between mismatch repair and excision repair?

Mismatch repair (MMR) refers to a DNA repair system whereby one member of a mismatched pair of bases is converted to the normally matched base while nucleotide excision repair (NER) refers to the main pathway used by mammals to remove bulky DNA lesions such as those formed by UV light.

What is mismatch repair and when does it happen?

What does non-homologous mean?

Definition of nonhomologous : being of unlike genetic constitution —used of chromosomes of one set containing nonallelic genes …

What is the difference between homologous and nonhomologous repair?

How is camptothecin produced?

It is commercially produced from plants, mainly Camptotheca acuminata and Nothapodytes nimmoniana2. Camptothecin is the third most in-demand alkaloid after taxol and vinca-alkaloids for anti-cancer applications, and inhibits DNA topoisomerase I in cancer cells leading to cell death3.

Is camptothecin FDA approved?

Four CPT analogues have been approved and are used in cancer chemotherapy today, topotecan, irinotecan, belotecan, and trastuzumab deruxtecan. Camptothecin has also been found in other plants including Chonemorpha fragrans….Camptothecin.

Clinical data
CAS Number	7689-03-4
PubChem CID	2538
DrugBank	DB04690
ChemSpider	22775

What are types of DNA damage?

What are three ways DNA gets damaged?

DNA can be damaged via environmental factors as well. Environmental agents such as UV light, ionizing radiation, and genotoxic chemicals. Replication forks can be stalled due to damaged DNA and double strand breaks are also a form of DNA damage.

What are the three types of DNA damage?