Looking for reliable standards when searching for follistatine kopen for institutional or academic research? PX1 Research provides high-purity, USA-manufactured Follistatin peptides backed by third-party HPLC and MS analytical certificates for precise in vitro and animal studies.
Looking for reliable standards when searching for follistatine kopen for institutional or academic research? PX1 Research provides high-purity, USA-manufactured Follistatin peptides backed by third-party HPLC and MS analytical certificates for precise in vitro and animal studies.
When evaluating options for follistatine kopen, research institutions must prioritize chemical identity, verified bioactivity, and freedom from bacterial contamination. Follistatin is an autocrine glycoprotein that functions as a potent antagonist to members of the Transforming Growth Factor-beta (TGF-β) superfamily, most notably myostatin (GDF-8) and activin A.
PX1 Research supplies reference-grade Follistatin strictly for in vitro assays, cellular cultures, and animal models. Every lot undergoes strict analytical validation—including High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS)—to ensure a purity threshold exceeding 98%. Order fulfillment is handled directly from our US-based facilities in California and Arizona, providing rapid same-day shipping for verified research accounts.
Follistatin (FST) is an endogenous monomeric glycoprotein originally identified in porcine follicular fluid as an inhibitor of follicle-stimulating hormone (FSH) secretion. Subsequent molecular characterization revealed that Follistatin operates via high-affinity binding to specific ligands within the TGF-β superfamily, preventing these ligands from interacting with their cognate serine/threonine kinase receptors.
In structural biology, Follistatin exists in several distinct isoforms produced via alternative splicing and post-translational proteolysis. The primary precursor transcript yields FST-344, which undergoes carboxyl-terminal cleavage to form the circulating isoform, FST-315, or localized tissue-bound forms like FST-288. FST-288 contains a basic heparin-binding domain that confers high affinity for cell-surface heparan sulfate proteoglycans, localizing its inhibitory activity primarily to the extracellular matrix.
Researchers studying structural biology and signaling kinetics often evaluate specific isoforms to determine tissue retention, systemic half-life, and localized receptor blockade. You can browse our full catalog of high-purity proteins and peptides on our all-peptides hub to locate specific reference materials for your experimental design.
The primary biochemical mechanism of Follistatin involves the stoichometric neutralization of activin A and myostatin (Growth Differentiation Factor 8, or GDF-8). In physiological systems, myostatin binds to the Activin type IIB receptor (ActRIIB), triggering downstream phosphorylation of Smad2 and Smad3 transcription factors. This signaling cascade upregulates genes involved in muscle protein degradation while suppressing protein synthesis pathways driven by Akt/mTOR.
Preclinical in vitro assays demonstrate that Follistatin binds to myostatin with nanomolar affinity, effectively masking the receptor-binding epitopes of the growth factor. By preventing myostatin from engaging ActRIIB, Follistatin attenuates Smad2/3 phosphorylation, thereby shifting cellular protein turn-over dynamics toward synthesis rather than catabolism.
Furthermore, Follistatin exhibits binding affinity for activin B, BMP-6, and BMP-7, albeit with variable dissociation constants. Investigators utilizing tgf-beta pathway tools routinely explore how broad-spectrum TGF-β ligand sequestering alters cellular proliferation, differentiation, and fibrotic tissue remodeling.
Extensive literature exists detailing the effects of Follistatin administration in various animal models and cell lines. Research focused on skeletal muscle biology, metabolic regulation, and fibrotic diseases frequently utilizes research-grade Follistatin to elucidate negative feedback loops governing tissue growth.
In murine models of muscle atrophy (such as denervation, unloading, or dexamethasone-induced cachexia), systemic or localized expression of Follistatin has been shown to preserve muscle cross-sectional area and muscular force production. Preclinical studies suggest that neutralization of endogenous myostatin and activin signaling prevents the transcriptomic activation of muscle-specific ubiquitin ligases, such as MuRF1 and MAFbx/Atrogin-1.
Beyond skeletal muscle, rodent models of liver and kidney fibrosis indicate that Follistatin administration reduces extracellular matrix accumulation. By blunting activin A signaling, Follistatin inhibits the transdifferentiation of quiescent fibroblasts into active myofibroblasts, thereby reducing collagen deposition. To review full study parameters and experimental data, visit our dedicated research library.
When designing experiments to inhibit myostatin signaling, researchers frequently compare Follistatin to alternative molecular agents targeting the same pathway. Understanding the functional differences between these compounds is critical for selecting the appropriate tool for specific assay conditions.
Follistatin functions as a natural endogenous inhibitor with multi-ligand affinity (binding myostatin, activin, and select BMPs). In contrast, engineered soluble receptors such as ACE-031 consist of the extracellular domain of the ActRIIB receptor fused to an IgG Fc region, acting as a decoy receptor for circulating ligands. While both suppress Smad2/3 signaling, their binding profiles and cell-surface retention properties differ substantially. Furthermore, researchers studying broader tissue repair mechanisms often combine TGF-β pathway modulators with regenerative peptide fragments like BPC-157 to evaluate synergistic outcomes in connective tissue healing models. For a comprehensive overview of non-receptor signaling inhibitors, see our guide on myostatin inhibitors.
For investigators seeking follistatine kopen from commercial vendors, establishing rigorous Quality Assurance/Quality Control (QA/QC) benchmarks is mandatory. Peptides and proteins synthesized for biochemical research can exhibit batch-to-batch variability, truncated sequence artifacts, or residual microbial toxins if manufacturing controls are inadequate.
PX1 Research enforces strict quality metrics across every production lot:
1. Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC): Establishes chemical purity, ensuring target protein integrity exceeds 98% with no major deletion sequences or aggregated species.
2. Electrospray Ionization Mass Spectrometry (ESI-MS): Validates exact molecular weight and sequence identity against theoretical mass profiles.
3. Bacterial Endotoxin Testing: Measures lipopolysaccharide (LPS) levels using Chromogenic Reagent LAL Assays to guarantee levels remain well below critical thresholds (<0.01 EU/μg), protecting sensitive cell culture and animal models from inflammatory interference.
4. Lot-Specific Certificates of Analysis (COA): Every shipment is accompanied by transparent, verifiable COA documentation generated by ISO 17025 accredited third-party testing laboratories.
Proper reconstitution technique is essential to preserve the tertiary structure and biological activity of recombinant proteins like Follistatin. Lyophilized proteins must be handled in sterile environments under laminar flow hoods to prevent microbial or particulate contamination.
Recommended solvent compatibility guidelines for laboratory manipulation include:
• Buffer Selection: Reconstitute lyophilized Follistatin in sterile, deionized water or phosphate-buffered saline (PBS, pH 7.4). For long-term storage after reconstitution, adding a carrier protein such as 0.1% Bovine Serum Albumin (BSA) or Human Serum Albumin (HSA) minimizes non-specific binding to plastic vial walls.
• Dissolution Technique: Gently add the solvent down the side of the glass vial. Allow the protein cake to hydrate naturally for 2–3 minutes, then gently swirl the vial. Do not vortex vigorously, as mechanical shear stress can cause protein denaturation and precipitation.
• Filtration: If necessary, pass reconstituted solutions through a 0.22 μm low-protein-binding syringe filter (e.g., PVDF or PES membrane).
Lyophilized protein stability depends heavily on temperature management during storage and transport. Unopened lyophilized vials of Follistatin should be stored at -20°C to -80°C for optimal long-term stability.
Key thermal stability considerations include:
• Desiccation: Keep vials tightly sealed in the presence of desiccant to avoid moisture absorption prior to reconstitution.
• Reconstituted Aliquots: Once reconstituted into liquid phase, store single-use working aliquots at -80°C to prevent degradation.
• Freeze-Thaw Cycle Prevention: Avoid repeated freeze-thaw cycles, which induce mechanical stress, aggregation, and loss of enzymatic or binding potency.
PX1 Research utilizes temperature-controlled packaging and fast logistics (shipping from California and Arizona) to safeguard chemical integrity throughout transit to institutional laboratories.
Sourcing research peptides internationally often introduces risks of variable quality, lack of lot traceability, and unreliable documentation. PX1 Research eliminates these vulnerabilities by maintaining strict US-based manufacturing and distribution workflows.
Our facilities adhere to cGMP-compliant production standards, utilizing automated peptide synthesis and state-of-the-art purification infrastructure. Independent ISO 17025 accredited analytical laboratories evaluate every batch, ensuring unbiased verification of identity, purity, and safety profiles.
Academic laboratories, biotechnology firms, and institutional researchers requiring bulk procurement or customized analytical verification can establish institutional pricing via our wholesale portal.
All products distributed by PX1 Research, including Follistatin, are designated strictly for Laboratory Research Use Only (RUO). These compounds are explicitly not intended for human or animal diagnostic, therapeutic, prophylactic, or clinical applications.
Procurement of research materials requires adherence to standard laboratory safety protocols, appropriate Personal Protective Equipment (PPE), and compliance with institutional biosafety guidelines. PX1 Research does not supply dosing instructions, therapeutic guidance, or clinical protocols under any circumstances.
What is the primary utility of Follistatin in research assays?
Follistatin is primarily studied as a high-affinity antagonist to myostatin (GDF-8) and activin A. Researchers utilize it to investigate Smad2/3 signaling inhibition, skeletal muscle regulation, and fibrotic tissue pathways in vitro and in animal models.
How does PX1 Research verify the purity of Follistatin?
Every lot of Follistatin undergoes rigorous third-party analytical testing using Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) for purity determination (>98%) and Mass Spectrometry (ESI-MS) for sequence and mass confirmation.
What endotoxin standards apply to PX1 Research peptides?
PX1 Research peptides are evaluated via Chromogenic LAL assays to ensure bacterial endotoxin levels remain below 0.01 EU/μg, rendering them suitable for sensitive cell culture and preclinical in vivo studies.
How should lyophilized Follistatin be stored upon delivery?
Lyophilized Follistatin should be stored at -20°C or -80°C upon receipt in a dry environment. Reconstituted liquid aliquots should be frozen at -80°C to maintain stability and prevent degradation from freeze-thaw cycles.
What diluent is recommended for reconstituting research-grade Follistatin?
Sterile deionized water or sterile phosphate-buffered saline (PBS, pH 7.4) is typically used. Adding 0.1% BSA or HSA to the buffer helps prevent surface adsorption to vial walls during storage.
How does Follistatin differ structurally from ACE-031?
Follistatin is a naturally occurring glycoprotein with broad binding affinity for activins, myostatin, and select BMPs. ACE-031 is an engineered fusion protein consisting of the extracellular domain of ActRIIB linked to an IgG Fc fragment.
What is the shipping protocol for orders placed with PX1 Research?
PX1 Research dispatches orders same-day Monday through Friday from facilities located in California and Arizona, utilizing temperature-stable, protective packaging to ensure compound integrity during transit.
Can Follistatin be purchased for human clinical administration?
No. All compounds supplied by PX1 Research are strictly designated for in vitro, cellular, and animal laboratory research use only. They are not cleared or intended for clinical, medical, or diagnostic use in humans.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.