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Heparin sulfate

Manufactured by R&D Systems

Heparin sulfate is a highly sulfated glycosaminoglycan that is found on the surface of many cell types. It plays a key role in various biological processes, including cell signaling, growth factor regulation, and extracellular matrix organization.

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2 protocols using heparin sulfate

1

Glioblastoma Tumor Cell Culture Protocol

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Surgical samples from patients with newly diagnosed or recurrent glioblastoma were obtained from the Tumor Tissue Bank within the Arnie Charbonneau Cancer Institute, transported to the BTIC Core Facility (Calgary, Alberta) and established as described previously44 (link), 45 (link). This study has Institutional review board approval under the “Brain Tumor and Related Tissue Bank protocol-V2” and approved by Foothills Hospital and the Conjoint Health Research Ethics Board and all methods were performed in accordance with the relevant guidelines and regulations. All established cell lines used were validated for identity by short tandem repeat analysis performed by Calgary Laboratory Services. All BTIC lines were grown in serum free-media supplemented with EGF (20 ng/ml; Peprotech, FGF2 (20 ng/ml; R&D Systems Inc, and heparin sulfate (2 mg/ml: R&D Systems). For the collection of conditioned media (CM) individual BTIC lines were plated at one million cells/ml, after 48 hrs media was collected and centrifuged to remove debris.
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2

Modulating FGF/ERK Pathway in ESCs & Embryos

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For activation of the FGF/ERK pathway in ESCs, 10–100 ng/ml of recombinant human FGF2 (rhFGF2, CellGS) or FGF4 (rhFGF4, Peprotech) was added to the specified culture medium with 1 μg/ml of Heparin Sulfate (Sigma). To inhibit FGF/ERK activity in ESC cultures, cell culture medium was supplemented with the MEK inhibitor (MEKi) PD0325901 (Stemgent) at 15–1000 nM, as specified in the figures and figure legends.
For activation of the FGF/ERK pathway in pre-implantation embryos, 1 μg/ml of recombinant human FGF4 (rhFGF4, R&D Systems) and 1 μg/ml of Heparin Sulfate were diluted in culture medium (KSOM-AA) and embryos cultured as described above. Control embryos were cultured in KSOM-AA supplemented with 1 μg/ml of Heparin Sulfate. Similarly, for inhibition of FGF/ERK activity, either a MEK inhibitor (MEKi) PD0325901, or FGF receptor inhibitor (FGFRi) AZD4547 (Santa Cruz) were diluted to 1 μM in culture medium, and embryos grown as described for the periods indicated in the corresponding figures.
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