OptiKine™ LIF – Leukemia Inhibitory Factor

Product Description

OptiKine LIF™ is InVitria's high-purity recombinant human leukemia inhibitory factor (rhLIF) produced using the proprietary ExpressTec™ expression platform. As a chemically defined, animal-origin-free cytokine, OptiKine LIF supports pluripotent stem cell self-renewal and helps maintain stemness in feeder-free culture systems. Unlike conventional rhLIF products produced in bacterial expression systems, OptiKine LIF delivers equivalent stem cell expansion performance with 500-fold lower bacterial endotoxin, making it the superior choice for neural stem cell research, mouse embryonic stem cell culture, and iPSC maintenance where consistent signaling and reduced contamination risk matter.

OptiKine LIF addresses critical challenges in stem cell research where LIF receptor signaling directly impacts self-renewal capacity and differentiation control. Research demonstrates equivalent neural stem cell expansion performance compared to E. coli-derived rhLIF, but with dramatically reduced endotoxin contamination that can interfere with sensitive stem cell workflows. The rice-based ExpressTec platform eliminates bacterial endotoxin at the source while ensuring consistent bioactivity, supporting applications from developmental biology research to regenerative medicine programs.

OptiKine LIF is supplied as a sterile, ready-to-use liquid formulation to eliminate reconstitution variability and streamline laboratory workflows. The product is manufactured under an ISO 9001:2015-certified, cGMP-compliant quality management system with comprehensive documentation to support research applications and process development. Available in 10 mL format with bulk quantities for scaled research programs, OptiKine LIF provides the consistency and purity required for demanding stem cell culture applications. OptiKine LIF has been validated in multiple peer-reviewed studies, including research published in the Journal of Biotechnology (2014) demonstrating its effectiveness for mouse embryonic stem cell maintenance, and recent work in The Ocular Surface (2023) supporting human corneal endothelial graft manufacturing. This published validation demonstrates OptiKine LIF's performance across diverse stem cell applications, from fundamental research to clinical manufacturing workflows, establishing it as a research-grade cytokine with documented performance in peer-reviewed literature.

Advantages

Enhanced Performance Over E. coli-Derived LIF

• 500-Fold Lower Bacterial Endotoxin: Dramatically reduced endotoxin contamination compared to E. coli-derived rhLIF eliminates interference with sensitive stem cell signaling pathways
• Equivalent Stem Cell Expansion: Comparable neural stem cell expansion performance to leading E. coli-derived products with superior purity profile
• Native Protein Folding: ExpressTec platform produces properly folded LIF with optimal bioactivity, eliminating refolding-associated structural heterogeneity
• Consistent Bioactivity: Controlled recombinant production ensures lot-to-lot consistency critical for reproducible stem cell research

Research-Validated Stem Cell Applications

• Peer-Reviewed Performance Data: Validated effectiveness in published research including mouse embryonic stem cell maintenance (Journal of Biotechnology, 2014) and human corneal endothelial graft manufacturing (The Ocular Surface, 2023)
• Mouse Embryonic Stem Cell Validation: Published research confirms OptiKine LIF maintains mESC pluripotency with performance equivalent to conventional LIF sources
• Clinical Manufacturing Applications: Demonstrated suitability for human corneal endothelial graft production, supporting translation from research to clinical applications
• Broad Stem Cell Compatibility: Research validates effectiveness across multiple stem cell types, from embryonic to specialized tissue-specific stem cells

Animal-Origin-Free Manufacturing Excellence

• 100% Chemically Defined: Complete animal-origin-free production eliminates batch variability and regulatory risks associated with animal-derived materials
• ExpressTec Platform: Rice-based expression system ensures consistent, high-quality cytokine production without animal-derived contamination risk
• Sterile Liquid Format: Ready-to-use formulation eliminates reconstitution variability and reduces contamination risk in sterile culture workflows
• Non-Bacterial Expression: Eliminates endotoxin source intrinsic to E. coli-based LIF production, reducing interference with sensitive stem cell signaling

Regulatory-Ready Documentation and Supply

• ISO 9001:2015-Certified Manufacturing: Produced in InVitria's cGMP-compliant facility with full quality documentation and traceability
• Comprehensive Documentation Package: Certificate of Analysis, Safety Data Sheet, Guidelines for Use, and Animal-Free Statement available
• Scalable Production: Independent of bacterial fermentation limitations with reliable supply for research through development applications
• Technical Support: Expert applications team provides protocol guidance and troubleshooting for stem cell culture optimization

Applications

Mouse Embryonic Stem Cell (mESC) Culture OptiKine LIF supports maintenance of mouse embryonic stem cell pluripotency in feeder-free culture systems where consistent LIF signaling is critical for preventing unwanted differentiation. Published research in the Journal of Biotechnology (2014) validates OptiKine LIF's effectiveness for mESC maintenance, demonstrating equivalent performance to conventional LIF sources while providing the enhanced purity profile of the ExpressTec platform. The 500-fold reduction in bacterial endotoxin eliminates inflammatory signaling that can interfere with stem cell self-renewal pathways.

Neural Stem Cell Expansion OptiKine LIF enhances neural stem cell expansion through LIF receptor activation, supporting self-renewal capacity and proliferation rate. Published application data demonstrates equivalent neural stem cell doubling time compared to E. coli-derived rhLIF with dramatically reduced endotoxin contamination. Applications include primary neural stem cell culture, H9-embryonic-derived neural stem cell expansion, and neurosphere formation assays where consistent LIF signaling and reduced contamination risk are essential for reproducible results.

Human Corneal Endothelial Cell Manufacturing OptiKine LIF supports specialized applications in regenerative medicine, including human corneal endothelial graft manufacturing as documented in The Ocular Surface (2023). This clinical manufacturing application demonstrates OptiKine LIF's suitability for therapeutic cell production where consistent cytokine performance and regulatory-grade documentation are essential. The animal-origin-free profile and comprehensive quality documentation support translation from research applications to clinical manufacturing workflows.

iPSC and Pluripotent Stem Cell Research OptiKine LIF supports human induced pluripotent stem cell maintenance and self-renewal in defined culture systems where LIF signaling contributes to pluripotency maintenance. The animal-origin-free profile aligns with good manufacturing practice requirements for iPSC-based research applications, while the reduced endotoxin specification ensures consistent signaling without inflammatory interference. Compatible with feeder-free iPSC culture protocols and serum-free maintenance media formulations.

Developmental Biology Research OptiKine LIF serves as a research tool for studying LIF receptor signaling pathways, stem cell differentiation control, and developmental biology mechanisms. The consistent bioactivity and reduced endotoxin profile enable precise control over LIF signaling in experimental systems, supporting research into stem cell biology, differentiation mechanisms, and regenerative medicine approaches. Applications include signaling pathway studies, differentiation control research, and mechanistic investigations of stem cell self-renewal.

Serum-Free and Chemically Defined Media Formulation OptiKine LIF integrates into chemically defined and serum-free media systems for stem cell culture applications where undefined components must be eliminated. Compatible with common stem cell culture media including DMEM/F12, N-2 supplement formulations, and proprietary serum-free systems. Working concentration typically ranges from 10-1000 ng/mL depending on cell type and culture conditions, optimized empirically during media development to balance self-renewal and differentiation control.

OptiKine LIF Frequently Asked Questions (FAQs)

Product Overview

What Is OptiKine LIF?

OptiKine LIF™ is InVitria's high-purity recombinant human leukemia inhibitory factor (rhLIF) produced using the proprietary ExpressTec™ expression platform. As a chemically defined, animal-origin-free cytokine, OptiKine LIF supports pluripotent stem cell self-renewal and helps maintain stemness in feeder-free culture systems. Unlike E. coli-derived rhLIF, OptiKine LIF delivers equivalent expansion performance with 500-fold lower bacterial endotoxin.

What Is OptiKine LIF Made From?

OptiKine LIF is produced recombinantly using InVitria's ExpressTec expression platform, a rice-based, non-mammalian, non-human expression host with no animal-derived, human-derived, or blood-derived materials. Manufacturing is fully animal-origin-free, from raw materials through production equipment to product-contact packaging.

Performance & Activity

How Does OptiKine LIF Compare to E. coli-Derived rhLIF?

OptiKine LIF demonstrates equivalent neural stem cell expansion performance compared to E. coli-derived rhLIF but with 500-fold lower bacterial endotoxin. This dramatic reduction in endotoxin contamination eliminates interference with sensitive stem cell signaling pathways while maintaining the bioactivity required for self-renewal and differentiation control.

What Makes OptiKine LIF Superior for Stem Cell Research?

OptiKine LIF provides the same LIF receptor signaling as E. coli-derived products but with dramatically reduced endotoxin contamination that can interfere with stem cell biology. The rice-based ExpressTec platform produces properly folded LIF with consistent bioactivity, while eliminating the bacterial contaminants that can affect experimental reproducibility.

Regulatory and Quality

Is OptiKine LIF Manufactured Under Quality Standards?

Yes. OptiKine LIF is manufactured under an ISO 9001:2015-certified, cGMP-compliant quality management system at InVitria's facility in Junction City, Kansas, USA. The product undergoes comprehensive quality testing including bioactivity, purity, endotoxin analysis, and sterility testing.

Is OptiKine LIF cGMP-Manufactured and Animal-Origin-Free?

Yes. InVitria manufactures OptiKine LIF  under a cGMP-compliant Quality Management System (QMS) with respect to 21 CFR Part 210/211 at its ISO 9001:2015-certified facility in Junction City, Kansas, USA. OptiKine LIF is 100% animal-origin-free — raw materials, production host, manufacturing equipment, and product-contact packaging are all free of animal-derived components.

What Quality Documentation Is Available for OptiKine LIF?

OptiKine LIF is supported by a Certificate of Analysis, Safety Data Sheet, Guidelines for Use, Certificate of Origin and Animal-Free / TSE-BSE Statement, ISO 9001 certificate, and cGMP Statement. Additional Quality and Regulatory documentation is available on request — including materials for IND-supporting packages and supplier qualification.

Does InVitria Provide a Drug Master File (DMF) or Equivalent Regulatory Documentation for OptiKine LIF?

InVitria provides a product-specific Technical Summary for OptiKine LIF containing CMC-style documentation — including manufacturing process, raw material controls, characterization data, release specifications, and lot analysis — designed to support customer regulatory submissions globally, including IND, BLA, and comparable filings under FDA, EMA, and other regulatory authorities. Unlike a Drug Master File, the Technical Summary is provided directly to the customer for incorporation into their own regulatory documentation, giving customers full visibility into the CMC information and supporting global filings without being tied to a single regulatory pathway. The OptiKine LIF Technical Summary is supported by per-lot Certificates of Analysis, Animal-Origin-Free / TSE-BSE statements, ISO 9001 certification, cGMP statements, and change notification under defined policies. Contact us to request the Technical Summary.

Research Validation

Is OptiKine LIF Validated in Peer-Reviewed Research?

Yes, OptiKine LIF is validated in multiple peer-reviewed publications, including research in the Journal of Biotechnology (2014) demonstrating effectiveness for mouse embryonic stem cell maintenance and work in The Ocular Surface (2023) supporting human corneal endothelial graft manufacturing. This published research confirms OptiKine LIF's performance across diverse stem cell applications.

What Research Applications Have Been Published with OptiKine LIF?

Published research includes mouse embryonic stem cell culture, neural stem cell expansion, and human corneal endothelial graft manufacturing. The research validates OptiKine LIF's effectiveness across fundamental stem cell biology research and clinical manufacturing applications, demonstrating its versatility for demanding stem cell culture workflows.

How Does OptiKine LIF Support Clinical Manufacturing Applications?

Research published in The Ocular Surface (2023) demonstrates OptiKine LIF's suitability for human corneal endothelial graft manufacturing, supporting translation from research applications to clinical manufacturing workflows. The animal-origin-free profile and comprehensive quality documentation align with regulatory requirements for therapeutic cell production.

Applications and Use

Can OptiKine LIF Be Used for Mouse Embryonic Stem Cell Culture?

Yes. OptiKine LIF supports maintenance of mouse embryonic stem cell pluripotency in feeder-free culture systems, with effectiveness validated in published research (Journal of Biotechnology, 2014). The reduced endotoxin profile provides cleaner culture conditions while maintaining the LIF signaling required to prevent unwanted differentiation and support self-renewal.

Is OptiKine LIF Suitable for Neural Stem Cell Expansion?

Yes. Published research demonstrates equivalent neural stem cell expansion performance compared to E. coli-derived rhLIF, with documented doubling time performance in H9-embryonic-derived neural stem cell culture. The 500-fold reduction in endotoxin provides superior culture conditions for sensitive neural stem cell applications.

What Concentration of OptiKine LIF Should I Use?

Working concentrations typically range from 10-1000 ng/mL depending on cell type and culture conditions. For neural stem cell expansion, concentrations of 10-100 ng/mL are commonly used. For mESC culture, concentrations of 100-1000 ng/mL are typical. Optimal concentration should be empirically determined for each specific cell line and culture system.

How Should I Add OptiKine LIF to My Culture Media?

OptiKine LIF is supplied as a sterile liquid and can be added directly to culture media at the desired working concentration. Mix gently and use immediately, or store prepared media according to your standard cell culture practices. Avoid repeated freeze-thaw cycles of the stock solution to maintain optimal bioactivity.

Can OptiKine LIF Replace E. coli-Derived LIF in Existing Protocols?

Yes, OptiKine LIF can directly replace E. coli-derived LIF in most existing stem cell culture protocols. Due to equivalent bioactivity, concentration adjustments are typically not required. The reduced endotoxin profile often allows for improved culture performance and reduced background inflammatory signaling.

What Is the Shelf Life of OptiKine LIF?

OptiKine LIF has a shelf life as specified on the Certificate of Analysis when stored properly at -20°C. The sterile liquid format ensures bioactivity throughout the shelf life period when handled according to the Guidelines for Use. Contact InVitria technical support for specific stability data.

Selection and Comparison

When Should I Choose OptiKine LIF Over E. coli-Derived LIF?

Choose OptiKine LIF when your application requires reduced endotoxin contamination, animal-origin-free qualification, consistent batch-to-batch performance, or enhanced culture purity. OptiKine LIF is particularly advantageous for sensitive stem cell applications, clinical manufacturing workflows, and research requiring high reproducibility.

What Are the Key Advantages of the ExpressTec Platform?

The ExpressTec platform eliminates bacterial endotoxin at the source, produces properly folded LIF with native bioactivity, ensures consistent lot-to-lot performance, and provides complete animal-origin-free manufacturing. This translates to cleaner culture conditions and more reproducible experimental results compared to bacterial expression systems.

Technical Support

Is Technical Support Available for OptiKine LIF Implementation?

Yes, InVitria's applications team provides comprehensive technical support for OptiKine LIF implementation, including protocol optimization, concentration recommendations, troubleshooting for stem cell culture applications, and guidance on transitioning from E. coli-derived products. Contact our team for application-specific recommendations and best practices.

Can InVitria Provide Custom Concentrations or Formulations?

Yes, InVitria offers custom concentrations and bulk quantities to support specific research requirements and scaled applications. Contact InVitria to discuss custom formulations, concentration requirements, or bulk pricing for large-volume applications.

Packaging and Ordering

What Packaging Options Are Available for OptiKine LIF?

OptiKine LIF  is available as a sterile 10 ml bottle.

How Can I Order OptiKine LIF?

OptiKine LIF is available worldwide through multiple purchasing pathways. Most customers work directly with InVitria for full access to the OptiKine LIF product portfolio, bulk and commercial-scale supply, GMP supply commitments, and regulatory documentation support. OptiKine LIF is also available through Fisher Scientific, VWR, and the Labviva procurement platform (which integrates with Ariba, Coupa, Oracle, and Jaggaer) for customers whose institutional procurement systems require integrated supplier ordering. European customers can order with direct fulfillment from InVitria's Rotterdam, Netherlands facility. All customers receive the same product, Certificate of Analysis, and technical support regardless of channel. Contact InVitria or request bulk pricing to place an order.

Storage and Handling

How Should OptiKine LIF Be Stored?

Store OptiKine LIF at -20°C per the Guidelines for Use and product Certificate of Analysis. The sterile liquid format provides stability during shipping and storage. Avoid repeated freeze-thaw cycles to maintain optimal bioactivity. For frequent use, consider aliquoting into smaller volumes to minimize freeze-thaw cycles.