Recombinant Proteins for Cell Culture, Stem Cell Research, and Immune Cell Expansion

Recombinant proteins for cell culture — growth factors (FGF, EGF, TGF-β) and cytokines (IL-2, IL-7, IL-15, IL-21) — direct cell proliferation, differentiation, and survival in serum-free media, stem cell differentiation, hybridoma and immune cell expansion, and organoid culture. Available in research-use-only (RUO), preclinical, and GMP grades; carrier-free (BSA-free), low-endotoxin, and HEK293-expressed options preserve native conformation and post-translational modifications. MBP ships to labs across the United States, Canada, and internationally with PO and Quick Order at mbpinc.net.

Explore available recombinant proteins or request a quotation by contacting customerservice@mbpinc.net. Our team can help identify the optimal growth factors and cytokines for your cell culture and cell expansion workflow.

Recombinant Proteins

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What are recombinant proteins for cell culture?

Recombinant proteins for cell culture are biologically active growth factors, cytokines, and signaling molecules produced using recombinant DNA technology to control specific cellular functions in vitro. Growth factors such as FGF (fibroblast growth factor), EGF (epidermal growth factor), and TGF-β (transforming growth factor beta) regulate cell growth, proliferation, survival, and differentiation. Cytokines including IL-2, IL-7, IL-15, and IL-21 influence immune cell activation, expansion, and function. These proteins are widely used in serum-free and chemically defined media, stem cell and iPSC culture, immune cell expansion, organoid development, hybridoma production, and cell and gene therapy workflows where precise control over cellular signaling is required.

What you will find:

Includes cytokines, chemokines, growth factors, and signaling proteins to support proliferation, differentiation, and maintenance of mammalian cells
Rat, human, and mouse recombinant proteins compatible with translational research models and diverse mammalian cell culture
Optimizing cell metabolic activity, signalling pathways, and experimental reproducibility in vitro using recombinant proteins
Suitable for organoid development, expansion of cells, activation of immune cells, neuronal studies, and protein expression workflow optimization.

How to choose recombinant proteins, cytokines, and growth factors

Quality grade: RUO vs. preclinical vs. GMP

Research-use-only (RUO) proteins are suitable for most academic and industrial research applications. Preclinical-grade proteins provide enhanced documentation and quality control for studies supporting clinical development. GMP-grade proteins are manufactured under controlled quality systems with complete traceability and lot-to-lot bioactivity verification, making them appropriate for cell therapy, gene therapy, and other regulated applications.

Expression system and post-translational modifications

The production system can significantly affect protein activity. HEK293 and other mammalian expression systems preserve native human post-translational modifications such as glycosylation and phosphorylation, which are often necessary for full biological function. Bacterial expression systems such as E. coli may offer lower cost and higher yields but cannot reproduce many of these modifications.

Carrier-free formulation

Carrier-free recombinant proteins are formulated without stabilizing proteins such as bovine serum albumin (BSA). This eliminates potential experimental interference from carrier proteins and supports serum-free, animal-component-free, and GMP-compatible workflows. Carrier-free formulations are especially important when studying sensitive signaling pathways or developing clinical manufacturing processes.

Endotoxin level and purity

Endotoxins can stimulate inflammatory responses and alter cell behavior, particularly in immune cell cultures. For T-cell expansion, stem cell culture, and other sensitive applications, low-endotoxin or endotoxin-free proteins with documented purity above 95% are preferred to ensure reproducible results.

Stability format: standard vs. thermostable

Standard recombinant proteins gradually lose activity during prolonged incubation at 37°C. Thermostable variants, such as engineered FGF2 formulations, maintain biological activity for longer periods and reduce the need for frequent media supplementation. These products can improve workflow efficiency in stem cell maintenance and differentiation protocols.

Storage and reconstitution

Lyophilized recombinant proteins offer extended shelf life and are typically stored frozen until use. After reconstitution, proteins should be aliquoted into single-use portions whenever possible to minimize repeated freeze-thaw cycles that can reduce activity. Proper storage conditions vary by product and should follow the manufacturer's recommendations.

Specifications context

Modern recombinant cytokines and growth factors are available in a wide range of formats including carrier-free, low-endotoxin, animal-component-free, and GMP-grade formulations. Many GMP-grade cytokines such as IL-2, IL-7, IL-15, and IL-21 undergo lot-specific bioactivity testing using validated reference standards to ensure consistent biological performance. Mammalian-cell-expressed proteins are increasingly preferred for applications requiring native structure and maximum biological activity.

As of 2026, carrier-free, low-endotoxin recombinant proteins produced in mammalian expression systems have become the preferred choice for stem cell culture, immune cell expansion, organoid development, and advanced biomanufacturing workflows.

For basal media used alongside recombinant proteins, see Classic Media. For additional supplementation reagents, see Cell Culture Supplements & Additives. Browse Mammalian Cell Culture for the broader category.

Contact the expert team at MBP today and get optimized recombinant proteins for your lab.

FAQ

Recombinant proteins used in cell culture — primarily growth factors and cytokines — direct cellular behavior by influencing proliferation, differentiation, and survival. Growth factors (such as FGF, EGF, TGF-β) directly influence cellular growth or differentiation, while cytokines (such as IL-2, IL-7, IL-15, IL-21) regulate immune responses and can also influence cell differentiation and activation. They are essential components of serum-free and chemically defined media formulations, stem cell differentiation protocols, hybridoma and CAR-T cell expansion, and organoid culture systems.

The main difference between research-use-only (RUO), preclinical, and GMP quality grades is the level of quality control, documentation, and intended use — not necessarily the underlying protein quality in all cases. RUO proteins are for non-clinical research applications. Preclinical-grade proteins support studies intended to inform clinical development. GMP-grade proteins are manufactured under documented quality systems with full traceability and lot-to-lot bioactivity verification, required for cell and gene therapy manufacturing where a smooth transition from research to clinical application is needed.

Carrier-free (or carrier protein-free) recombinant proteins are formulated without bovine serum albumin (BSA) or other equivalent carrier proteins, which are sometimes added to stabilize lyophilized proteins during storage. Eliminating carrier proteins removes the risk of introducing unrelated or undesired effects on experiments from the carrier protein itself — particularly important in serum-free, animal-component-free, and GMP-grade applications where any non-essential protein in the formulation is a potential variable or contaminant.

Lyophilized recombinant proteins are typically stable at room temperature for approximately 3 days, or frozen for up to 2 years at –20 °C or –80 °C prior to reconstitution. Once reconstituted, proteins can be stored at 4 °C for 1–2 weeks or frozen for up to a year, though freezing single-use aliquots and thawing fresh for each use is recommended to maximize protein stability and activity. Sterile filtering after dilution into media or final working solution is recommended even when supplier sterility is documented.

Recombinant proteins for cell culture are produced in bacterial (E. coli), insect, yeast, and mammalian (typically HEK293) expression systems. Human cell (HEK293)-expressed proteins retain native human conformation and post-translational modifications such as glycosylation and phosphorylation, which many proteins require for full biological activity. Proteins co-expressed in bacterial systems lack these post-translational modifications, which can limit activity for proteins where glycosylation is functionally required.

Endotoxins (such as lipopolysaccharide, LPS) present in commercially available recombinant proteins — even at levels considered 'commercially acceptable' — can activate immune cells in culture and interfere with the biological activity of both the protein and the cultured cells. For immune cell culture, cytokine/T-cell expansion, and any application sensitive to immune activation artifacts, endotoxin-free or extremely low-endotoxin recombinant proteins are an important specification, alongside purity ideally exceeding 95%.

Thermostable growth factors (such as thermostable FGF2/FGF-G3 variants) are engineered to retain bioactivity longer at 37 °C cell culture incubation temperatures than standard recombinant growth factors, which can degrade significantly within 24 hours under normal culture conditions. A thermostable FGF formulation can eliminate the need for media changes over a weekend in stem cell culture protocols, reducing both labor and the risk of culture disruption from missed feeding schedules.

MBP supports purchase order and Quick Order procurement for recombinant proteins, growth factors, and cytokines for labs in the United States, Canada, and internationally. MBP is a registered vendor for Howard Hughes Medical Institute, Vanderbilt University, MD Anderson Cancer Center, and Eurofins. For RUO, preclinical, or GMP grade sourcing, lot-specific CoA and bioactivity documentation, contact MBP at mbpinc.net.

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