HIF-PHD-IN-1: HIF Prolyl Hydroxylase Inhibitor FAQs
HIF-PHD-IN-1: HIF Prolyl Hydroxylase Inhibitor FAQs
HIF-PHD-IN-1 is a small-molecule inhibitor targeting HIF prolyl hydroxylase domain (PHD) enzymes, used in research to stabilize hypoxia-inducible factor (HIF) and investigate oxygen-sensing signaling pathways.
- Product Name
- HIF-PHD-IN-1
- SKU / Catalog Number
- H646239
- Target
- HIF Prolyl Hydroxylase Domain (PHD) enzymes (PHD1, PHD2, PHD3)
- Primary Research Application
- Stabilization of HIF-1α/HIF-2α; hypoxia signaling studies
- Cross-reference
- MCE catalog number HY-131346
- Compound Class
- Small-molecule PHD inhibitor
What Is HIF-PHD-IN-1 and How Does It Work?
HIF-PHD-IN-1 (Aladdin SKU: H646239; cross-reference MCE HY-131346) is a small-molecule inhibitor designed to block the activity of prolyl hydroxylase domain (PHD) enzymes, also known as EGL nine homolog (EGLN) proteins. Under normoxic conditions, PHD enzymes hydroxylate specific proline residues on the alpha subunit of hypoxia-inducible factors (HIF-1α and HIF-2α), tagging them for recognition by the von Hippel–Lindau (VHL) E3 ubiquitin ligase complex and subsequent proteasomal degradation.
By inhibiting PHD activity, HIF-PHD-IN-1 prevents this hydroxylation event, allowing HIF-α subunits to accumulate and translocate to the nucleus. There, they dimerize with HIF-1β (ARNT) and activate transcription of hypoxia-responsive genes involved in erythropoiesis, angiogenesis, glycolysis, and cellular adaptation to low-oxygen environments.
This mechanism makes HIF-PHD-IN-1 a valuable pharmacological tool for researchers studying oxygen-sensing pathways, HIF-dependent gene regulation, and related therapeutic targets.
Solubility, Storage, and Handling Guidelines
Proper handling of HIF-PHD-IN-1 is essential to maintain compound integrity and ensure reproducible experimental results. Researchers should consult the Certificate of Analysis (CoA) and Safety Data Sheet (SDS) provided with each lot for authoritative solubility and storage data specific to that batch.
General solubility guidance: PHD inhibitors of this chemical class are commonly soluble in dimethyl sulfoxide (DMSO). It is recommended to prepare concentrated stock solutions in DMSO and dilute further into aqueous assay buffers or cell culture media immediately before use. DMSO concentration in final assay conditions should generally be kept at or below 0.1% (v/v) to minimize cytotoxic effects, unless otherwise validated for your specific experimental system.
Storage: Store the compound in a tightly sealed vial at −20 °C or −80 °C, protected from light and moisture. Avoid repeated freeze–thaw cycles; aliquoting stock solutions before storage is strongly recommended.
Handling: Work under appropriate ventilation. Wear personal protective equipment (gloves, lab coat, eye protection) as indicated in the SDS. Do not consume or inhale.
Recommended Research Applications and Experimental Considerations
HIF-PHD-IN-1 is intended for in vitro and preclinical in vivo research use only. It is not approved for human therapeutic use. Key research applications include:
- HIF-α stabilization assays: Treating cells with HIF-PHD-IN-1 allows researchers to mimic hypoxic HIF accumulation under normoxic conditions, serving as a useful positive control or mechanistic probe.
- Transcriptional reporter assays: Use in combination with hypoxia-response element (HRE)-driven luciferase or fluorescent reporter constructs to measure HIF transcriptional activity.
- Erythropoiesis and angiogenesis models: Investigating EPO induction, VEGF upregulation, and related downstream targets of HIF activation.
- PHD isoform selectivity studies: Assessing relative potency against PHD1, PHD2, and PHD3 in biochemical or cellular systems.
- Combination studies: Pairing with VHL pathway modulators, iron chelators, or other HIF pathway tools to dissect regulatory mechanisms.
Appropriate vehicle controls (DMSO at matched concentration) must be included in all experiments. Dose–response characterization in the specific cell line or model system of interest is advised prior to definitive experiments.
Ordering, Availability, and Quality Information
HIF-PHD-IN-1 is available from Aladdin Scientific under catalog number H646239. This product cross-references MCE catalog number HY-131346.
Purity and quality: Each lot is manufactured and quality-controlled to research-grade standards. A Certificate of Analysis (CoA) documenting purity (typically assessed by HPLC), identity (NMR or MS), and lot-specific data is available upon request or via the Aladdin website product page. Researchers are encouraged to review the CoA before initiating experiments.
How to order: HIF-PHD-IN-1 can be ordered directly through the Aladdin Scientific website, by contacting our sales team, or through authorized regional distributors. For bulk quantities, custom packaging, or institutional procurement inquiries, please contact Aladdin customer service.
Returns and refunds: Please refer to Aladdin's standard returns and refunds policy. Compounds that have been opened or improperly stored may not be eligible for return. Contact customer service promptly if you have concerns about product quality upon receipt.
Frequently asked questions
What is the mechanism of action of HIF-PHD-IN-1?
HIF-PHD-IN-1 inhibits prolyl hydroxylase domain (PHD) enzymes (PHD1/EGLN2, PHD2/EGLN1, PHD3/EGLN3), which are responsible for hydroxylating HIF-α subunits under normoxic conditions. Inhibiting PHD activity prevents HIF-α hydroxylation and subsequent VHL-mediated proteasomal degradation, leading to HIF-α stabilization and activation of hypoxia-responsive transcriptional programs.
In what solvents is HIF-PHD-IN-1 soluble, and how should stock solutions be prepared?
HIF-PHD-IN-1 is generally soluble in DMSO. Prepare concentrated stock solutions in DMSO, then dilute into aqueous buffers or cell culture media immediately before use. Keep the final DMSO concentration at or below 0.1% (v/v) in assays to minimize cytotoxicity. Always consult the lot-specific CoA for confirmed solubility data.
What are the recommended storage conditions for HIF-PHD-IN-1?
Store HIF-PHD-IN-1 as a dry powder or in aliquoted stock solutions at −20 °C or −80 °C in a sealed, light-protected vial. Avoid repeated freeze–thaw cycles by preparing single-use aliquots. Refer to the product CoA and SDS for lot-specific storage recommendations.
Is HIF-PHD-IN-1 suitable for in vivo studies?
HIF-PHD-IN-1 is a research-grade compound intended for in vitro and preclinical research use. While PHD inhibitors have been explored in preclinical in vivo models, researchers should independently validate pharmacokinetic properties, dosing, formulation, and tolerability for their specific animal model before conducting in vivo experiments. This compound is not approved for human use.
How does HIF-PHD-IN-1 differ from iron chelators like deferoxamine as HIF stabilizers?
Both PHD inhibitors such as HIF-PHD-IN-1 and iron chelators like deferoxamine (DFO) can lead to HIF-α stabilization, but through different mechanisms. Iron chelators deplete the ferrous iron (Fe²⁺) co-factor required for PHD catalytic activity, indirectly inhibiting PHDs. HIF-PHD-IN-1, as a direct PHD inhibitor, acts on the enzyme active site more selectively. This mechanistic distinction is important for experimental design and interpretation of results.
Where can I find the Certificate of Analysis (CoA) for my lot of HIF-PHD-IN-1?
The Certificate of Analysis for HIF-PHD-IN-1 (H646239) can be accessed on the Aladdin Scientific product page by entering your lot number, or by contacting Aladdin customer service directly. The CoA provides lot-specific purity, identity, and storage information verified for that batch.
References
- Kaelin WG Jr, Ratcliffe PJ. Oxygen sensing by metazoans: the central role of the HIF hydroxylase pathway. Molecular Cell. 2008;30(4):393-402. doi:10.1016/j.molcel.2008.04.009
- Semenza GL. Oxygen sensing, hypoxia-inducible factors, and disease pathophysiology. Annual Review of Pathology. 2014;9:47-71. doi:10.1146/annurev-pathol-012513-104720
- Epstein AC, Gleadle JM, McNeill LA, et al. C. elegans EGL-9 and mammalian homologs define a family of dioxygenases that regulate HIF by prolyl hydroxylation. Cell. 2001;107(1):43-54. doi:10.1016/S0092-8674(01)00507-4
- MCE (MedChemExpress) product page for HIF-PHD-IN-1, catalog number HY-131346. Accessed via MedChemExpress website.
Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.
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