Pharmacology Book

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Cytochrome P-450 3A3/4 Isoenzyme

Aka: Cytochrome P-450 3A3/4 Isoenzyme, Cytochrome P-450 3A3, Cytochrome P-450 3A4, CYP3A3, CYP3A4, CYP3As
  1. Background
    1. Responsible for majority of P-450 drug interactions
    2. Accounts for 40 to 60% of hepatic P-450 isoenzymes
    3. Also present in intestinal epithelium
  2. Interactions: Metabolized by CYP 3A3/4 (Substrates)
    1. Neuropsychiatric drugs
      1. Anticonvulsants
        1. Carbamazepine (Tegretol)
        2. Ethosuximide (Zarontin)
      2. Tertiary amine Tricyclic Antidepressants
        1. Amitriptyline (Elavil)
        2. Clomipramine
        3. Imipramine
      3. Antipsychotics
        1. Clozapine
      4. Benzodiazepines
        1. Alprazolam (Xanax)
        2. Diazepam (Valium)
        3. Midazolam (Versed)
        4. Triazolam (Halcion)
      5. Other
        1. Ergotamine: Inhibitor
    2. Cardiopulmonary Drugs
      1. Antiarrhythmics
        1. Amiodarone (Cordarone)
        2. Disopyramide (Norpace)
        3. Lidocaine (Xylocaine)
        4. Propafenone (Rythmol)
        5. Quinidine
      2. Lipid lowering agents (i.e. Statins)
        1. Lovastatin (Mevacor)
        2. Simvastatin (Zocor)
        3. Atorvastatin (Lipitor)
        4. Cerivastatin
      3. Antihypertensives
        1. Felodipine (Plendil)
        2. Diltiazem (Cardizem)
        3. Nifedipine (Procardia, Adalat)
        4. Verapamil (Calan)
        5. Amlodipine (Norvasc)
        6. Nisoldipine
        7. Nimodipine (Nimotop)
    3. Antibiotics
      1. Macrolide antibiotics
        1. Clarithromycin
        2. Troleandomycin
      2. HIV Protease Inhibitors
        1. Indinavir
        2. Nelfinavir
        3. Ritonavir
        4. Saquinavir
        5. Amprenavir
    4. Miscellaneous
      1. Alfentanil
      2. Cisapride (Propulsid)
      3. Estrogens (Ethinyl Estradiol, 17 B-estradiol)
      4. Opioids
        1. Codeine
        2. Alfentanil
        3. Fentanyl
        4. Sufentanil
      5. Sildenafil (Viagra)
      6. Testosterone
      7. Tamoxifen
      8. Vincristine
      9. Vinblastine
      10. Ifosfamide
      11. Cyclophosphamide
      12. Astemizole (Hismanal)
      13. Terfenadine (Seldane)
      14. Loratadine (Claritin)
      15. Cyclosporine
      16. Tacrolimus
      17. Zolpidem (Ambien)
      18. Corticosteroids (Budesonide, Cortisol)
  3. Interactions: Inhibitor of CYP 3A3/4
    1. Neuropsychiatric drugs
      1. Midazolam (Versed)
      2. Nefazodone (Serzone)
    2. Cardiopulmonary Drugs
      1. Quinidine
      2. Diltiazem (Cardizem)
      3. Nifedipine (Procardia, Adalat)
      4. Verapamil (Calan)
      5. Zafirlukast
    3. Antibiotics
      1. Indinavir
      2. Nelfinavir
      3. Ritonavir
      4. Fluconazole
      5. Itraconazole
      6. Ketoconazole
      7. Clarithromycin
      8. Erythromycin
      9. Telithromycin (Ketek)
    4. Miscellaneous
      1. Bromocriptine
      2. Cimetidine
      3. Estrogens (Ethinyl Estradiol)
      4. Grapefruit juice
      5. Mibefradil
      6. Omeprazole (Prilosec)
  4. Interactions: Inducer of CYP 3A3/4
    1. Neuropsychiatric drugs
      1. Carbamazepine
      2. Phenobarbital and other barbiturates
      3. Phenytoin
      4. Hypericum perforatum (St. John's Wort)
    2. Antibiotics
      1. Rifampin
    3. Miscellaneous
      1. Dexamethasone
      2. Troglitazone

Cytochrome P450 3A4 (C1142644)

Definition (NCI) Induced primarily in liver by glucocorticoids, drugs, pesticides, and carcinogens and encoded by human CYP3A4 Gene (Cytochrome P450 IIIA Subfamily), Cytochrome P450 3A4 is a 502-amino acid 57.3-kD membrane-bound ER heme-thiolate monooxygenase. CYP3A4 is involved in an NADPH-dependent electron transport pathway and phase I oxidative metabolism of carcinogens, steroids, fatty acids, and xenobiotics, as well as bioactivation of aflatoxin B(1) to a genotoxic derivative. Activity seems a key predictor of drug responsiveness and toxicity. (from LocusLink, Swiss-Prot, OMIM, and NCI)
Concepts Amino Acid, Peptide, or Protein (T116) , Enzyme (T126)
MSH C510163
SnomedCT 422741004
English CYP3A4 protein, human, nifedipine oxidase, human, quinine 3-monooxygenase, human, cytochrome P450, subfamily IIIA (niphedipine oxidase), polypeptide 4, human, CYP3A4, Cytochrome p450 CYP3A4 enzyme (substance), Cytochrome p450 CYP3A4 enzyme, albendazole monooxygenase, human, cytochrome P450, family 3, subfamily A, polypeptide 4, human, cytochrome P450 3A4 protein, human, cytochrome p-450 3a4, cyp3a4, cytochrome p450 3a4, p450 3a4, cytochrome P450HLp3, cytochrome P-450 CYP3A3 (human), CYP3A3 protein, human, Cytochrome P450 3A4, P450-3A4, Cytochrome P450 Nifedipine Oxidase, Cytochrome P450, Subfamily IIIA (Niphedipine Oxidase), Polypeptide 3, Cytochrome P450, Subfamily IIIA (Niphedipine Oxidase), Polypeptide 4, Cytochrome P450, Subfamily IIIA, Polypeptide 4, Cytochrome P450PCN1, EC 1.14.14.1, Glucocorticoid-Inducible P450, Nifedipine Oxidase, P450, FAMILY III, P450-III, Steroid Inducible, P450-III, Steroid-Inducible, Quinine 3-Monooxygenase, Steroid-Inducible P450- III
Spanish enzima CYP3A4 del citocromo p450 (sustancia), enzima CYP3A4 del citocromo p450, CYP3A4
Sources
Derived from the NIH UMLS (Unified Medical Language System)


CYP3A4 wt Allele (C1705261)

Definition (NCI) Human CYP3A4 wild-type allele is located in the vicinity of 7q21.1 and is approximately 27 kb in length. This allele, which encodes cytochrome P450 3A4 protein, plays a role in the oxidation of steroids, drugs, carcinogens and other xenobiotics. CYP3A4 gene dysfunction is associated with both lung cancer and epipodophyllotoxin-induced leukemogenesis.
Concepts Gene or Genome (T028)
English CYP3A, CYPIIIA4, HLP, NF-25, P450-PCN1, P450C3, P450PCN1, CP33, CP34, CYP3A3, CYP3, Cytochrome P450, Family 3, Subfamily A, Polypeptide 4 wt Allele, CYP3A4 wt Allele
Sources
Derived from the NIH UMLS (Unified Medical Language System)


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