Details of the Drug Combination

General Information of Drug Combination (ID: DC6Q4R7)

• Drug Combination Name: Dihydroergotamine + Diltiazem
• Indication: Hepatoblastoma; Status: Investigative [1]
• Component Drugs:
  Dihydroergotamine (DM5IKUF): Small molecular drug
  Diltiazem (DMAI7ZV): Small molecular drug
• High-throughput Screening Result:
  Testing Cell Line: HB3
  Zero Interaction Potency (ZIP) Score: 5.172
  Bliss Independence Score: 8.106
  Loewe Additivity Score: 3.624
  LHighest Single Agent (HSA) Score: 7.268

Molecular Interaction Atlas of This Drug Combination

Indication(s) of Dihydroergotamine

Disease Entry	ICD 11	Status	REF
Cluster headache	8A81.0	Approved	[2]
Migraine	8A80	Approved	[3]
Migraine disorder	N.A.	Approved	[2]

Dihydroergotamine Interacts with 1 DTT Molecule(s)

DTT Name	DTT ID	UniProt ID	Mode of Action	REF
Dopamine D2 receptor (D2R)	TTEX248	DRD2_HUMAN	Agonist	[6]

Dihydroergotamine Interacts with 1 DME Molecule(s)

DME Name	DME ID	UniProt ID	Mode of Action	REF
Cytochrome P450 3A4 (CYP3A4)	DE4LYSA	CP3A4_HUMAN	Metabolism	[7]

Indication(s) of Diltiazem

Disease Entry	ICD 11	Status	REF
Angina pectoris	BA40	Approved	[4]
Atrial fibrillation	BC81.3	Approved	[4]
Hypertension	BA00-BA04	Approved	[5]
Malignant essential hypertension	BA00	Approved	[4]

Diltiazem Interacts with 1 DTT Molecule(s)

DTT Name	DTT ID	UniProt ID	Mode of Action	REF
Voltage-gated calcium channel alpha-2/delta-1 (CACNA2D1)	TTFK1JQ	CA2D1_HUMAN	Blocker	[8]

Diltiazem Interacts with 1 DTP Molecule(s)

DTP Name	DTP ID	UniProt ID	Mode of Action	REF
P-glycoprotein 1 (ABCB1)	DTUGYRD	MDR1_HUMAN	Substrate	[9]

Diltiazem Interacts with 7 DME Molecule(s)

DME Name	DME ID	UniProt ID	Mode of Action	REF
Cytochrome P450 3A4 (CYP3A4)	DE4LYSA	CP3A4_HUMAN	Metabolism	[10]
Cytochrome P450 2D6 (CYP2D6)	DECB0K3	CP2D6_HUMAN	Metabolism	[11]
Cytochrome P450 3A5 (CYP3A5)	DEIBDNY	CP3A5_HUMAN	Metabolism	[12]
Cytochrome P450 3A7 (CYP3A7)	DERD86B	CP3A7_HUMAN	Metabolism	[13]
Cytochrome P450 2C8 (CYP2C8)	DES5XRU	CP2C8_HUMAN	Metabolism	[14]
Cytochrome P450 2C9 (CYP2C9)	DE5IED8	CP2C9_HUMAN	Metabolism	[11]
Mephenytoin 4-hydroxylase (CYP2C19)	DEGTFWK	CP2CJ_HUMAN	Metabolism	[15]

Diltiazem Interacts with 6 DOT Molecule(s)

DOT Name	DOT ID	UniProt ID	Mode of Action	REF
Cytochrome P450 2D6 (CYP2D6)	OTZJC802	CP2D6_HUMAN	Increases ADR	[16]
Potassium voltage-gated channel subfamily KQT member 1 (KCNQ1)	OT8SPJNX	KCNQ1_HUMAN	Increases ADR	[16]
Sodium channel protein type 5 subunit alpha (SCN5A)	OTGYZWR6	SCN5A_HUMAN	Increases ADR	[16]
Beta-1 adrenergic receptor (ADRB1)	OTQBWN4U	ADRB1_HUMAN	Increases Response	[17]
Potassium voltage-gated channel subfamily E member 1 (KCNE1)	OTZNQUW9	KCNE1_HUMAN	Increases ADR	[16]
Potassium voltage-gated channel subfamily H member 2 (KCNH2)	OTZX881H	KCNH2_HUMAN	Increases ADR	[16]

Test Results of This Drug Combination in Other Disease Systems

Indication	DrugCom ID	Cell Line	Status	REF
DD2	DC4DFEP	DD2	Investigative	[1]

References

• [1] Recurrent recessive mutation in deoxyguanosine kinase causes idiopathic noncirrhotic portal hypertension.Hepatology. 2016 Jun;63(6):1977-86. doi: 10.1002/hep.28499. Epub 2016 Mar 31.
• [2] Dihydroergotamine FDA Label
• [3] Sustained pain relief with dihydroergotamine in migraine is potentially due to persistent binding to 5-HT1B and 5-HT1D receptors. . The Journal of Headache and Pain 201314(Suppl 1):P75.
• [4] Diltiazem FDA Label
• [5] URL: http://www.guidetopharmacology.org Nucleic Acids Res. 2015 Oct 12. pii: gkv1037. The IUPHAR/BPS Guide to PHARMACOLOGY in 2016: towards curated quantitative interactions between 1300 protein targets and 6000 ligands. (Ligand id: 2298).
• [6] Current and prospective pharmacological targets in relation to antimigraine action. Naunyn Schmiedebergs Arch Pharmacol. 2008 Oct;378(4):371-94.
• [7] CYP2D6 and CYP3A4 involvement in the primary oxidative metabolism of hydrocodone by human liver microsomes. Br J Clin Pharmacol. 2004 Mar;57(3):287-97.
• [8] Egr-1, the potential target of calcium channel blockers in cardioprotection with ischemia/reperfusion injury in rats. Cell Physiol Biochem. 2009;24(1-2):17-24.
• [9] Mammalian drug efflux transporters of the ATP binding cassette (ABC) family in multidrug resistance: A review of the past decade. Cancer Lett. 2016 Jan 1;370(1):153-64.
• [10] Comparative metabolic capabilities of CYP3A4, CYP3A5, and CYP3A7. Drug Metab Dispos. 2002 Aug;30(8):883-91.
• [11] Drug interactions with calcium channel blockers: possible involvement of metabolite-intermediate complexation with CYP3A. Drug Metab Dispos. 2000 Feb;28(2):125-30.
• [12] Significant impacts of CYP3A4*1G and CYP3A5*3 genetic polymorphisms on the pharmacokinetics of diltiazem and its main metabolites in Chinese adult kidney transplant patients. J Clin Pharm Ther. 2016 Jun;41(3):341-7.
• [13] FDA Drug Development and Drug Interactions
• [14] Role of CYP3A4 in human hepatic diltiazem N-demethylation: inhibition of CYP3A4 activity by oxidized diltiazem metabolites. J Pharmacol Exp Ther. 1997 Jul;282(1):294-300.
• [15] Effects of CYP3A4 inhibition by diltiazem on pharmacokinetics and dynamics of diazepam in relation to CYP2C19 genotype status. Drug Metab Dispos. 2001 Oct;29(10):1284-9.
• [16] ADReCS-Target: target profiles for aiding drug safety research and application. Nucleic Acids Res. 2018 Jan 4;46(D1):D911-D917. doi: 10.1093/nar/gkx899.
• [17] A common 1-adrenergic receptor polymorphism predicts favorable response to rate-control therapy in atrial fibrillation. J Am Coll Cardiol. 2012 Jan 3;59(1):49-56. doi: 10.1016/j.jacc.2011.08.061.