Name: Interleukin-4 (Human, Recombinant)
Brand: Molecular Depot
SKU: B2010311
Price: 495.00 USD
Availability: InStock

<h2 data-section-id="f727ot" data-start="0" data-end="41">What are interferons and interleukins?</h2>
&nbsp;
Interferons (IFN-alpha, IFN-beta, IFN-gamma) and interleukins (IL-1 through IL-18) are signaling cytokines that direct immune cell communication, antiviral response, and inflammation. Related entities include tumor necrosis factor (TNF-alpha), colony-stimulating factors (G-CSF, GM-CSF), Janus kinase (JAK) signaling, and T-cell, NK-cell, and macrophage activation assays.
&nbsp;
<h2 dir="ltr">What you'll find in this category: </h2>
<ul>
<li dir="ltr" aria-level="1">
Antiviral Defense Modulators: Premium interferons prepared to study cellular resistance mechanisms and viral replication paths.
</li>
<li dir="ltr" aria-level="1">
Leukocyte Communication Links: Pure interleukins designed to direct immune cell activation, differentiation, and crosstalk.
</li>
<li dir="ltr" aria-level="1">
Immune Response Standards: Batch-validated signaling tools built to maintain steady, predictable baselines in co-culture models.
</li>
</ul>
&nbsp;
<h2 data-section-id="1p9v7w8" data-start="587" data-end="632">How to choose interferons and interleukins</h2>
&nbsp;
Species and isoform match
Confirm the protocol calls for human, mouse, or rat recombinant protein and the correct isoform (e.g., IFN-gamma vs. IFN-alpha2a, IL-2 vs. IL-15). A mismatched species cytokine will not activate the intended receptor in most cell lines.
&nbsp;
Carrier protein presence
Carrier-free formats (no BSA) are preferred for applications where trace bovine protein could confound downstream assays, such as ELISA development or animal-component-free (ACF) stem cell culture. Carrier-added formats improve stability for general cell culture supplementation.
&nbsp;
Endotoxin level
Endotoxin-free or low-endotoxin (typically &lt;0.1 ng per microgram of protein) preparations matter for immune cell assays, since lipopolysaccharide contamination can independently activate macrophages and skew interleukin readouts.
&nbsp;
Activity verification (bioassay vs. SDS-PAGE)
Look for lot-specific bioactivity data (e.g., ED50 in a proliferation or reporter assay), not only purity by SDS-PAGE, when reproducibility across lots is critical for a multi-month study.
&nbsp;
<h2 data-section-id="1fljvas" data-start="2347" data-end="2372">Specifications context</h2>
&nbsp;
Concentrations for cytokine stimulation assays are typically expressed in ng/mL, with working ranges from 0.1 ng/mL to 100 ng/mL depending on the receptor's sensitivity and the readout (proliferation vs. reporter gene). Specific activity is reported in units/mg or IU/mg for interferons, following international reference standards used to calibrate antiviral potency. As of 2026, labs increasingly request carrier-free, endotoxin-tested lots when cytokines feed into single-cell or multi-omics workflows where background activation must be minimized.
For related signaling reagents, see Epidermal Growth Factors (EGF), Transforming Growth Factors, Tumor Necrosis Factors (TNF-alpha), Fibroblast Growth Factors (FGF), and the broader Growth Factors &amp; Hormones category.
<a href="https://mbpinc.net/contact-us">Connect with the MBP sales desk</a> today to lock in your core immune modulator reserves.

Interferons & Interleukins

Molecular Depot

Key Specifications

Interleukin-4 (Human, Recombinant)

Interleukin-4 (Human, Recombinant) by Molecular Depot is highly pure recombinant human interleukin-4 (IL-4) expressed in CHO cells. IL-4 is a potent lymphoid cell growth factor that stimulates the growth and survival of B and T cells. It is used with GM-CSF to differentiate monocytes into dendritic cells, to polarize Th2 cells and alternatively activated macrophages, and as a standard in IL-4 immunoassays. Each unit contains 10 µg. MBP supplies Molecular Depot research reagents to research labs in the United States, Canada and worldwide.