£160.00 – £1,200.00
Recombinant human FGF4 protein is a 14 kDa non-glycosylated, high purity, bioactive domain of human fibroblast growth factor 4 expressed in E. coli. For the proliferation and differentiation of embryonic and tissue stem cells and organoid culture.
Fibroblast growth factor 4 (FGF4) is a member of the FGF superfamily with a physiological role in the regulation of proliferation and differentiation in embryonic stem cells and tissue stem cells1-3.
Recombinant human FGF4 protein promotes neural stem cell proliferation and neuronal differentiation in the postnatal brain4, increases the proliferation rate of human adult bone-marrow derived mesenchymal stem cells5 and supports the maintenance, proliferation and self-renewal properties of human embryonic stem cells6.
Synergism between FGF4 and WNT signalling acts to form hindgut organoids from iPSC-derived human posterior gut endoderm cells7 and recombinant human FGF4 protein is used to mimic embryonic intestinal development during directed differentiation in culture of pluripotent stem cells into intestinal organoids.
Summary: Mature domain of human FGF4 protein (residues 79-206, Uniprot: P08620) expressed in E. coli and purified to homogeneity. Mature protein is a non-glycosylated protein.
Molecular mass: ~14 kDa
Form: Protein is provided frozen in PBS (carrier protein-free) at 1 mg/ml.
Fibroblast Growth Factor-4, Kaposi’s sarcoma-associated FGF, k-FGF, Heparin secretory-transforming protein 1 HST-1, Transforming protein KS3, Heparin-binding growth factor 4, HBGF-4
For peace of mind that our recombinant human FGF4 protein will work exactly the same way every day, from batch to batch and at any scale you need, we conduct extensive purity and bioactivity analysis, including SDS-PAGE, mass spectrometry, reversed-phase chromatography, UV spectroscopy and endotoxin level testing.
We also work with our collaborators at Stemnovate, a specialist stem cell biotechnology company, to check the final purified protein induces the correct level of proliferation in iPSC culture .
Find out more about our extensive purity testing in the next tab.
All our proteins are produced in our Cambridge, UK labs. We provide detailed quality data for each batch because we believe reliable, high quality cytokines and growth factors are critical for successful stem cell and organoid culture. Please contact us with questions any time by email at email@example.com or phone +44 (0) 1223 491486 / US toll free 1-866 877 2185.
Order online and upload your PO or pay by credit card, or email your PO to firstname.lastname@example.org.
We provide bulk orders and stock reservation for sensitive applications, please email us.
For final purity and activity tests on our proteins, we choose a vial at random and reconstitute as recommended. Biochemical identity and purity is determined using SDS-PAGE, mass spectrometry and analytical reversed-phase chromatography. Bioactivity is quantified using an appropriate cell-based assay. As stem cells are sensitive to endotoxin levels, we use a high resolution test to ensure endotoxin levels are at industry-leading low levels (<0.01 EU per µg protein). We also check that the correct amount of protein is recovered from the vial - it might sound basic but if you order 100 µg, we believe you should receive 100 µg, so when you use the proteins you can rely on your calculated dilution.
Purified recombinant protein (7 µg) was resolved using 15% w/v SDS-PAGE in reduced (+β-mercaptothanol, R) and non-reduced conditions (NR) and stained with Coomassie Brilliant Blue R250.
Human embryonic kidney cell line 293T (HEK293T) was cultured in serum-free media containing 100ng/ml hFGF2. The number of viable metabolically active cells was detected by ATP measurement using a bioluminescent reaction (n=3; data show mean ± SEM). Data provided by Stemnovate Ltd, Cambridge, UK.
MALDI mass spectrometric analysis is used to confirm the molecular mass of the intact protein and to reveal any heterogeneity that would not be evident in SDS-PAGE analysis. The results are compared with calculated mass of the protein with the assumption that all the cysteines are disulfide-linked. The different peaks represent different charge states of the protein.
Stem cell cultures are sensitive to endotoxins1, which can be present in media, serum and as a contaminant on plasticware. We optimize our protein production processes to ensure the lowest possible levels of endotoxin contamination. Our endotoxin pass criteria are set at the industry-leading <0.1 EU per ug protein and we aim for <0.01 EU per ug protein. Endotoxin levels in our proteins are determined by an external expert microbiological testing services provider.
IPSC (Stemnovate iPSC1) were cultured in serum-free media containing 100ng/ml hFGF4. The number of viable metabolically active cells was detected by ATP measurement using a bioluminescent reaction (n=3; data show mean ± SEM). No media change was performed on day 2 leading to reduced viable cell numbers on day 3. Data provided by Stemnovate Ltd, Cambridge, UK.
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Thaw the sample on ice, spin briefly and dilute with PBS as needed. Our proteins are supplied carrier protein-free. If compatible with your work, add carrier protein of your choice such as BSA, HSA or gelatin to further minimize loss by adsorption. Spin in a microfuge for 5 minutes at maximum speed, and divide the solution into suitable aliquots and store at -80°C. We recommend that single-use aliquots should be prepared to avoid freeze-thaw cycles.
Every effort is made to ensure samples are sterile however we recommend sterile filtering after dilution in media or the final working solution.
We check that the correct amount of recombinant FGF4 protein is recovered from the vial – it might sound basic but if you order 100 µg, we believe you should receive 100 µg, so when you use the proteins you can rely on your calculated dilution.
The sample was diluted 1:10 in 100 mM sodium phosphate pH 7.4 and the UV spectrum 340-220 nm measured in duplicate. Concentration was calculated using extinction coefficient at 280 nm
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USA toll free 1-866 877 2185
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