Mitomycin

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Mitomycin
Stereo wireframe model of (4S,6S,7R,8S)-mitomycin
Mitomycin ball-and-stick.png
Identifiers
CAS number50-07-7 YesY
PubChem5746 YesY, 44286993 (7RYesY, 16757880 (7SYesY
ChemSpider5544 YesY, 23136133 (7RYesY
UNII50SG953SK6 YesY
DrugBankDB00305
KEGGC06681 YesY
ChEBICHEBI:27504 YesY
ChEMBLCHEMBL105 YesY
ATC codeL01DC03
Beilstein Reference3570056
3DMetB02086
Jmol-3D imagesImage 1
Image 2
Properties
Molecular formulaC15H18N4O5
Molar mass334.33 g mol−1
AppearanceWhite or colourless solid
Melting point360 °C (680 °F; 633 K) low of range
Solubility in water8.43 g L-1
log P-1.6
Isoelectric point10.9
Pharmacology
Routes of
administration
Eye drops Intravenous
MetabolismHepatic
Elimination
half-life
8–48 min
Legal status

POM(UK) -only(US)

Pregnancy
category
D(AU)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references
 
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Mitomycin
Stereo wireframe model of (4S,6S,7R,8S)-mitomycin
Mitomycin ball-and-stick.png
Identifiers
CAS number50-07-7 YesY
PubChem5746 YesY, 44286993 (7RYesY, 16757880 (7SYesY
ChemSpider5544 YesY, 23136133 (7RYesY
UNII50SG953SK6 YesY
DrugBankDB00305
KEGGC06681 YesY
ChEBICHEBI:27504 YesY
ChEMBLCHEMBL105 YesY
ATC codeL01DC03
Beilstein Reference3570056
3DMetB02086
Jmol-3D imagesImage 1
Image 2
Properties
Molecular formulaC15H18N4O5
Molar mass334.33 g mol−1
AppearanceWhite or colourless solid
Melting point360 °C (680 °F; 633 K) low of range
Solubility in water8.43 g L-1
log P-1.6
Isoelectric point10.9
Pharmacology
Routes of
administration
Eye drops Intravenous
MetabolismHepatic
Elimination
half-life
8–48 min
Legal status

POM(UK) -only(US)

Pregnancy
category
D(AU)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

The mitomycins are a family of aziridine-containing natural products isolated from Streptomyces caespitosus or Streptomyces lavendulae.[1] One of these compounds, mitomycin C, finds use as a chemotherapeutic agent by virtue of its antitumour antibiotic activity. It is given intravenously to treat upper gastro-intestinal (e.g. esophageal carcinoma), anal cancers, and breast cancers, as well as by bladder instillation for superficial bladder tumours. It causes delayed bone marrow toxicity and therefore it is usually administered at 6-weekly intervals. Prolonged use may result in permanent bone-marrow damage. It may also cause lung fibrosis and renal damage.

Mitomycin C has also been used topically rather than intravenously in several areas. The first is cancers, particularly bladder cancers and intraperitoneal tumours. It is now well known that a single instillation of this agent within 6 hours of bladder tumor resection can prevent recurrence. The second is in eye surgery where mitomycin C 0.02% is applied topically to prevent scarring during glaucoma filtering surgery and to prevent haze after PRK or superlasik; mitomycin C has also been shown to reduce fibrosis in strabismus surgery.[2] The third is in esophageal and tracheal stenosis where application of mitomycin C onto the mucosa immediately following dilatation will decrease re-stenosis by decreasing the production of fibroblasts and scar tissue.

Mechanism of Action[edit]

Mitomycin C is a potent DNA crosslinker. A single crosslink per genome has shown to be effective in killing bacteria. This is accomplished by reductive activation followed by two N-alkylations. Both alkylations are sequence specific for a guanine nucleoside in the sequence 5'-CpG-3'.[3] Potential bis-alkylating heterocylic quinones were synthetised in order to explore their antitumoral activities by bioreductive alkylation.[4] Mitomycin is also used as a chemotherapeutic agent in glaucoma surgery.

Biosynthesis[edit]

In general, the biosynthesis of all mitomycins[5] proceeds via combination of 3-amino-5-hydroxybenzoic acid (AHBA), D-glucosamine, and carbamoyl phosphate, to form the mitosane core, followed by specific tailoring steps. The key intermediate, AHBA, is a common precursor to other anticancer drugs, such as rifamycin and ansamycin.

Specifically, the biosynthesis begins with the addition of phosphoenolpyruvate (PEP) to erythrose-4-phosphate (E4P) with a yet undiscovered enzyme, which is then ammoniated to give 4-amino-3-deoxy-D-arabino heptulosonic acid-7-phosphate (aminoDHAP). Next, DHQ synthase catalyzes a ring closure to give 4-amino3-dehydroquinate (aminoDHQ), which is then undergoes a double oxidation via aminoDHQ dehydratase to give 4-amino-dehydroshikimate (aminoDHS). The key intermediate, 3-amino-5-hydroxybenzoic acid (AHBA), is made via aromatization by AHBA synthase.

Mitomycin c AHBA.svg

Synthesis of the key intermediate, 3-amino-5-hydroxy-benzoic acid.

The mitosane core is synthesized as shown below via condensation of AHBA and D-glucosamine, although no specific enzyme has been characterized that mediates this transformation. Once this condensation has occurred, the mitosane core is tailored by a variety of enzymes. Unfortunately, both the sequence and the identity of these steps are yet to be determined.

Mitomycin c tailoring.svg

Biological effects[edit]

In the bacterium Bacillus subtilis, mitomycin C induces competence for transformation.[6] Transformation is a process of DNA transfer between cells, and is regarded as a form of bacterial sexual interaction. In the fruit fly Drosophila melanogaster, exposure to mitomycin C increases recombination during meiosis, a key stage of the sexual cycle.[7] In the plant Arabidopsis thaliana, mutant strains defective in genes necessary for recombination during meiosis and mitosis are hypersensitive to killing by mitomycin C.[8] It has been suggested that these, and other related findings, can be explained by the idea that during sexual processes in prokaryotes (transformation) and eukaryotes (meiosis) DNA crosslinks and other damages introduced by mitomycin C are removed by recombinational repair.[9]

References[edit]

  1. ^ Danshiitsoodol N, de Pinho CA, Matoba Y, Kumagai T, Sugiyama M (2006). "The mitomycin C (MMC)-binding protein from MMC-producing microorganisms protects from the lethal effect of bleomycin: crystallographic analysis to elucidate the binding mode of the antibiotic to the protein". J Molec Biol 360 (2): 398–408. doi:10.1016/j.jmb.2006.05.017. PMID 16756991. 
  2. ^ Kersey JP, Vivian AJ (Jul–Sep 2008). "Mitomycin and amniotic membrane: a new method of reducing adhesions and fibrosis in strabismus surgery". Strabismus 16 (3). pp. 116–118. doi:10.1080/09273970802405493. PMID 18788060. 
  3. ^ Tomasz, Maria (September 1995). "Mitomycin C: small, fast and deadly (but very selective).". Chemistry and Biology 2 (9): 575–579. doi:10.1016/1074-5521(95)90120-5. PMID 9383461. 
  4. ^ Renault, J.; Baron, M; Mailliet P. et al. Heterocyclic quinones 2. Quinoxaline-5,6-(and 5-8)-diones - Potential antitumoral agents. Eur. J. Med. Chem. 16, 6, 545–550, 1981.
  5. ^ Mao Y.; Varoglu M.; Sherman D.H. (April 1999). "Molecular characterization and analysis of the biosynthetic gene cluster for the antitumor antibiotic mitomycin C from Streptomyces Iavendulae NRRL 2564.". Chemistry and Biology 6 (4): 251–263. doi:10.1016/S1074-5521(99)80040-4. PMID 10099135. 
  6. ^ Charpentier X, Kay E, Schneider D, Shuman HA (March 2011). "Antibiotics and UV radiation induce competence for natural transformation in Legionella pneumophila". J. Bacteriol. 193 (5): 1114–21. doi:10.1128/JB.01146-10. PMC 3067580. PMID 21169481. 
  7. ^ Schewe MJ, Suzuki DT, Erasmus U (July 1971). "The genetic effects of mitomycin C in Drosophila melanogaster. II. Induced meiotic recombination". Mutat. Res. 12 (3): 269–79. PMID 5563942. 
  8. ^ Bleuyard JY, Gallego ME, Savigny F, White CI (February 2005). "Differing requirements for the Arabidopsis Rad51 paralogs in meiosis and DNA repair". Plant J. 41 (4): 533–45. doi:10.1111/j.1365-313X.2004.02318.x. PMID 15686518. 
  9. ^ Bernstein H, Bernstein C, Michod RE (2012). DNA repair as the primary adaptive function of sex in bacteria and eukaryotes. Chapter 1: pp.1-49 in: DNA Repair: New Research, Sakura Kimura and Sora Shimizu editors. Nova Sci. Publ., Hauppauge, N.Y. ISBN 978-1-62100-808-8 https://www.novapublishers.com/catalog/product_info.php?products_id=31918