Human ABCC4 (Multidrug resistance-associated protein 4) ELISA Kit (DEIA-FN19)

Regulatory status: For research use only, not for use in diagnostic procedures.

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Size
96T
Sample
serum, plasma, cell culture supernatants, tissue homogenate
Species Reactivity
Human
Intended Use
For quantitative detection of Human ABCC4 (Multidrug resistance-associated protein 4) in serum, plasma, tissue homogenates and other biological fluids.
Contents of Kit
1. 96-well strip plate (Dismountable), 1 plate
2. Lyophilized Standard, 2 vials
3. Sample/Standard dilution buffer, 20 mL
4. Biotin-detection antibody (Concentrated), 120 uL
5. Antibody dilution buffer, 10 mL
6. HRP-Streptavidin Conjugate(SABC), 120 uL
7. SABC dilution buffer, 10 mL
8. TMB substrate, 10 mL
9. Stop solution, 10 mL
10. Wash buffer (25X), 30 mL
11. Plate Sealer, 5 pieces
12. Product Manual, 1 copy
Storage
Store the unopened product at 2 - 8 °C. Do not use past expiration date.
Precision
Intra-Assay: CV<8%
Inter-Assay: CV<10%
Detection Range
1.56-100 ng/mL
Sensitivity
0.938 ng/mL
Standard Curve

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References


C-MYC correlates with expression of multidrug transporters ABCC1 and ABCC4

BLOOD

Authors: Ho, Lye Lin; Chong, Li; Ling, Silvia; Lau, Diana; Lau, Edwin; Iland, Harry; Joshua, Douglas E.; Allen, John

Human Immunodeficiency Virus Protease Inhibitors Interact with ATP Binding Cassette Transporter 4/Multidrug Resistance Protein 4: A Basis for Unanticipated Enhanced Cytotoxicity

MOLECULAR PHARMACOLOGY

Authors: Fukuda, Yu; Takenaka, Kazumasa; Sparreboom, Alex; Cheepala, Satish B.; Wu, Chung-Pu; Ekins, Sean; Ambudkar, Suresh V.; Schuetz, John D.

Human immunodeficiency virus (HIV) pharmacotherapy, by combining different drug classes such as nucleoside analogs and HIV protease inhibitors (PIs), has increased HIV-patient life expectancy. Consequently, among these patients, an increase in non-HIV-associated cancers has produced a patient cohort requiring both HIV and cancer chemotherapy. We hypothesized that multidrug resistance protein 4/ATP binding cassette transporter 4 (MRP4/ABCC4), a widely expressed transporter of nucleoside-based antiviral medications as well as cancer therapeutics might interact with PIs. Among the PIs evaluated (nelfinavir, ritonavir, amprenavir, saquinavir, and indinavir), only nelfinavir both effectively stimulated MRP4 ATPase activity and inhibited substrate-stimulated ATPase activity. Saos2 and human embryonic kidney 293 cells engineered to overexpress MRP4 were then used to assess transport and cytotoxicity. MRP4 expression reduced intracellular accumulation of nelfinavir and consequently conferred survival advantage to nelfinavir cytotoxicity. Nelfinavir blocked Mrp4-mediated export, which is consistent with its ability to increase the sensitivity of MRP4-expressing cells to methotrexate. In contrast, targeted inactivation of Abcc4/Mrp4 in mouse cells specifically enhanced nelfinavir and 9-(2-phosphonylmethoxyethyl) adenine cytotoxicity. These results suggest that nelfinavir is both an inhibitor and substrate of MRP4. Because nelfinavir is a new MRP4/ABCC4 substrate, we developed a MRP4/ABCC4 pharmacophore model, which showed that the nelfinavir binding site is shared with chemotherapeutic substrates such as adefovir and methotrexate. Our studies reveal, for the first time, that nelfinavir, a potent and cytotoxic PI, is both a substrate and inhibitor of MRP4. These findings suggest that HIV-infected cancer patients receiving nelfinavir might experience both enhanced antitumor efficacy and unexpected adverse toxicity given the role of MRP4/ABCC4 in exporting nucleoside-based antiretroviral medications and cancer chemotherapeutics.

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