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Accession NumberDB00038  (BTD00021, BIOD00021)
GroupsApproved, Investigational

Oprelvekin, the active ingredient in Neumega® is recombinant Interleukin eleven, which is produced in Escherichia coli (E. coli) by recombinant DNA technology. The protein has a molecular mass of approximately 19,000 daltons, and is non-glycosylated. The polypeptide is 177 amino acids in length (the natural IL-11 has 178). This alteration has not resulted in measurable differences in bioactivity either in vitro or in vivo.

The primary hematopoietic activity of Neumega® is stimulation of megakaryocytopoiesis and thrombopoiesis. In mice and nonhuman primate studies Neumega® has shown potent thrombopoietic activity in compromised hematopoiesis, including moderately to severely myelosuppressed animals. In these studies, Neumega® improved platelet nadirs and accelerated platelet recoveries compared to controls.

In animal studies Oprelvekin also has non-hematopoetic activities. This includes the regulation of intestinal epithelium growth (enhanced healing of gastrointestinal lesions), the inhibition of adipogenesis, the induction of acute phase protein synthesis (e.g., fibrinogen), and inhibition of macrophageal released pro-inflammatory cytokines.

Protein structureDb00038
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Protein chemical formulaC854H1411N253O235S2
Protein average weight19047.2 Da
>DB00038 sequence
Download FASTA Format
Adipogenesis inhibitory factor
Interleukin-11 precursor
External Identifiers Not Available
Approved Prescription Products
NameDosageStrengthRouteLabellerMarketing StartMarketing End
NeumegakitWyeth Bio Pharma Division Of Wyeth Pharmaceuticals Inc., A Subsidiary Of Pfizer Inc.1997-11-01Not applicableUs
Approved Generic Prescription ProductsNot Available
Approved Over the Counter ProductsNot Available
Unapproved/Other Products Not Available
International BrandsNot Available
Brand mixturesNot Available
SaltsNot Available
CAS number145941-26-0
DescriptionNot Available
KingdomOrganic Compounds
Super ClassOrganic Acids
ClassCarboxylic Acids and Derivatives
Sub ClassAmino Acids, Peptides, and Analogues
Direct ParentPeptides
Alternative ParentsNot Available
SubstituentsNot Available
Molecular FrameworkNot Available
External DescriptorsNot Available
IndicationIncreases reduced platelet levels due to chemotherapy
PharmacodynamicsOprelvekin is indicated for the prevention of severe thrombocytopenia and the reduction of the need for platelet transfusions following myelosuppressive chemotherapy in adult patients with nonmyeloid malignancies who are at high risk of severe thrombocytopenia. The primary hematopoietic activity of Oprelvekin is stimulation of megakaryocytopoiesis and thrombopoiesis. Oprelvekin has shown potent thrombopoietic activity in individuals with compromised hematopoiesis
Mechanism of actionOprelvekin binds to the interleukin 11 receptor which leads to a cascade of signal transduction events. IL-11 is a thrombopoietic growth factor that directly stimulates the proliferation of hematopoietic stem cells and megakaryocyte progenitor cells and induces megakaryocyte maturation resulting in increased platelet production.
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AbsorptionAbsolute bioavailability is over 80%.
Volume of distributionNot Available
Protein bindingNot Available
MetabolismNot Available
Route of eliminationThe kidney is the primary route of elimination. The amount of intact Neumega in urine was low, indicating that the molecule was metabolized before excretion.
Half life6.9 +/- 1.7 hrs
ClearanceNot Available
ToxicityNot Available
Affected organisms
  • Humans and other mammals
PathwaysNot Available
SNP Mediated EffectsNot Available
SNP Mediated Adverse Drug ReactionsNot Available
ManufacturersNot Available
Dosage forms
Unit descriptionCostUnit
Neumega 5 mg vial352.9USD vial
DrugBank does not sell nor buy drugs. Pricing information is supplied for informational purposes only.
PatentsNot Available
Experimental Properties
hydrophobicity-0.070Not Available
isoelectric point11.16Not Available
Synthesis ReferenceNot Available
General ReferencesNot Available
External Links
ATC CodesL03AC02
AHFS CodesNot Available
PDB EntriesNot Available
FDA labelDownload (57.8 KB)
MSDSNot Available
Drug InteractionsNot Available
Food InteractionsNot Available


Pharmacological action
General Function:
Transmembrane signaling receptor activity
Specific Function:
Receptor for interleukin-11. The receptor systems for IL6, LIF, OSM, CNTF, IL11 and CT1 can utilize IL6ST for initiating signal transmission. The IL11/IL11RA/IL6ST complex may be involved in the control of proliferation and/or differentiation of skeletogenic progenitor or other mesenchymal cells. Essential for the normal development of craniofacial bones and teeth. Restricts suture fusion and t...
Gene Name:
Uniprot ID:
Molecular Weight:
45221.925 Da
  1. Nandurkar HH, Robb L, Begley CG: The role of IL-II in hematopoiesis as revealed by a targeted mutation of its receptor. Stem Cells. 1998;16 Suppl 2:53-65. [PubMed:11012177 ]
  2. Li R, Hartley L, Robb L: Cloning of rat interleukin 11 and interleukin 11 receptor alpha chain and analysis of their expression in rat uterus in the peri-implantation period. Reproduction. 2001 Oct;122(4):593-600. [PubMed:11570967 ]
  3. Nandurkar HH, Hilton DJ, Nathan P, Willson T, Nicola N, Begley CG: The human IL-11 receptor requires gp130 for signalling: demonstration by molecular cloning of the receptor. Oncogene. 1996 Feb 1;12(3):585-93. [PubMed:8637716 ]
  4. Romas E, Udagawa N, Zhou H, Tamura T, Saito M, Taga T, Hilton DJ, Suda T, Ng KW, Martin TJ: The role of gp130-mediated signals in osteoclast development: regulation of interleukin 11 production by osteoblasts and distribution of its receptor in bone marrow cultures. J Exp Med. 1996 Jun 1;183(6):2581-91. [PubMed:8676079 ]
  5. Nandurkar HH, Robb L, Tarlinton D, Barnett L, Kontgen F, Begley CG: Adult mice with targeted mutation of the interleukin-11 receptor (IL11Ra) display normal hematopoiesis. Blood. 1997 Sep 15;90(6):2148-59. [PubMed:9310465 ]
  6. Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. [PubMed:11752352 ]
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Drug created on June 13, 2005 07:24 / Updated on March 14, 2016 09:57