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Thermostable FGF does not require media changes over the weekend.
Basic fibroblast growth factor (FGFbasic), also known as bFGF, FGF2, FGF-β, or HBGF-2, belongs to the FGF family.
FGF plays important roles in diverse biological functions in vivo and in vitro.
FGF is involved in embryonic development, neuron differentiation, and the proliferation of cells of mesodermal origin and many cells of neuroectodermal, ectodermal, and endodermal origin1,2.
|Animal-free Recombinant Human FGFBasic-TS|
FGF is a required component of stem cell culture media for maintaining cells in an undifferentiated state. Because FGF is unstable, daily media changes are needed.
Proteintech has developed a thermostable FGF basic (FGFbasic-TS) that supports a 2-day media change schedule, so no media changes are required over a weekend (Figure 1).
|The activity of FGFbasic-TS was determined by the dose-dependent stimulation of the proliferation of the Balb/c 3T3 cell line using Promega CellTiter96® Aqueous Non-Radioactive Cell Proliferation Assay.||FGFbasic-TS was resolved by SDS-PAGE and stained with Coomassie blue. (R) represents reducing conditions and (NR) represents non-reducing conditions.|
FGFbasic-TS was engineered for enhanced stability in culture media, without modification of its biological function.
The 154 amino acid, 17 kDa, non-glycosylated monomer cytokine is expressed in Proteintech’s proprietary human cell line (HEK293) developed for the production of authentic human recombinant proteins.
FGFbasic-TS has greater stability than E. coli-derived FGFbasic, lasting 3X longer at 37˚C (Figure 2).
|The stability of FGFbasic-TS and FGF basic (E. coli-derived) in xeno-free, chemically defined cell culture media at 37˚C. The protein concentration was determined by ELISA each day for 3 days. After one day of incubation at 37˚C, FGF basic was undetectable, while FGFbasic-TS was present at levels 60%, 35%, and 20% of its starting concentration at days 1, 2, and 3.|
Pluripotency Markers: SSEA-1, Tra 1-60, Tra1-81, Oct3/4
Molecular markers are one method to characterize the status of a pluripotent stem cell by their expression over passaging.
FGFbasic-TS was evaluated for effective maintenance of pluripotency markers using a 2-day feeding schedule in human embryonic stem cells (hESCs) and human-induced pluripotent stem cells (iPSCs).
FGFbasic-TS was added at 10 ng/mL.
Human cell lines were cultured in xeno-free, chemically defined media containing either a xeno-free chemically defined matrix (XFM) or Matrigel (MG).
Cells were passaged using either xeno-free, non-enzymatic passaging solution (XFPS) or a collagen-based reagent (CG).
Pluripotency cell surface markers were analyzed by flow cytometry for hESC and iPSC cultures grown in media containing 7.5 or 10 ng/mL FGFbasic-TS on the starting culture and after the 10th split, for all culture conditions (Figure 3 and 4).
|Figure 3||Figure 4|
|Pluripotency markers in hESC cultures maintained with thermostable FGF basic, in the starter culture and after 10 passages.||Pluripotency markers in iPSC cultures maintained with thermostable FGF basic, in the starter culture and after 10 passages.|
FGF basic and FGFbasic-TS were subjected to a tryptic digest then analyzed on an SDS-PAGE gel, without and with Heparin to stabilize against degradation by trypsin.
FGF basic was significantly degraded after 4.5 hours, while FGFbasic-TS protein levels were only slightly reduced (Figure 5).
FGFbasic-TS was more stable in cell culture media and more resistant to proteolytic degradation compared to FGF basic.
|Figure 5. Trypsin digestion of FGF basic and FGFbasic-TS. HMW protein standard and FGF basic or FGFbasic-TS were loaded onto a 4-12% Nu-PAGE Bis-Tris gel. The gel was electrophoresed under non-reducing conditions.|
Proteintech FGFbasic-TS HZ1285 maintains cell growth, pluripotency, and differentiation potential with a 2-day feeding schedule.
Thermostable - maintains cell cultures more efficiently and homogeneously
Cost-effective - requires less frequent media changes for cell culture
High biological activity - can retain its biological activity for over 2-3 days at 37°C