Array profiling to study PPAR-alpha in progenitor cell

Peroxisome proliferator-activated receptor alpha (PPAR-alpha also known as NR1C1)  regulates a myriad of biological processes. It is a key modulator of lipid metabolism.

Raybiotech C-Series Arrays by tebu-bio (ready-to-use kits and lab services)

Raybiotech C-Series Arrays by tebu-bio (ready-to-use kits and lab services).

Vergori, L. et al. have shown in murine models how PPAR-alpha regulates endothelial progenitor cell maturation and myeloid lineage differentiation via a NADPH oxidase-dependent mechanism. (1) All the data described in this publication suggest that PPAR-alpha, in murine models, is a critical regulator of recruitment, homing and maturation of Bone Marrow-derived progenitor cells.

This conclusion was made (in part) possible with the analysis of secretome markers by using C-Series profiling arrays for the analysis of bone marrow-derived cells in PPAR-alpha wild-type vs. KO mice.

RayBio® Membrane-Based Antibody Arrays (C-Series) are tools for screening and comparing expression levels of many cytokines between samples. C-series Arrays are available as ready-to-use kits or lab services. To ensure top quality in the data obtained, Raybiotech’s service providers successfully complete training and certification programs to receive the “RayBiotech Certified Array Service Providers” yellow award.

In Europe, tebu-bio laboratories (France) were among the first laboratories in the world to be certified by Raybiotech in 2012.

tebu-bio’s services also cover Quansys BioSciences and FullMoon BioSystems technologies for outsourcing protein profiling and quantification.

Interested in studying the secretome biomarkers relevant in your model for Cardiovascular diseases?

Leave your comment or contact us!tebu-bio: European RaybioTech's Certified Laboratory service provider

(1) Vergori L. et al. “PPARa regulates endothelial progenitor cell maturation and myeloid lineage differentiation through a NADPH oxidase-dependent mechanism in mice” (2015) Stem Cells – 33 (4) :1292-303. DOI: 10.1002/stem.1924.

Wnt4 and Rspo1 to promote mammary stem cell self-renewal


WNT4 antibody detects WNT4 protein by western blot analysis. Non-transfected (-) and Wnt4-transfected (+, including V5-tag) 293T whole cell extracts (100 μg) were separated by 10% SDS-PAGE, and the membrane was blotted with WNT4 antibody (Cat. No. 210GTX101085) at a dilution of 1:2500. The V5 was used as internal control (Cat. No. 210GTX117997, 1:2500) shown at the bottom panel.

The behavior of adult mammary stem cells (MaSCs) is precisely controlled by the activities of hormones and local factors, though the underlying mechanisms remain obscure. A recent report by Cai et al in Genes & Development illustrates the dynamic interaction between systemic ovarian hormones, Wnt signaling, and the Wnt agonist R-spondin1 (Rspo1) to promote MaSC self-renewal.

In response to estradiol and progesterone, R-spondin1 and Wnt4, but not Wnt7B, act as niche factors to drive MaSC regeneration, with Wnt4 acting through the canonical Wnt/β-catenin signaling pathway. This work establishes a clear mechanistic link between locally acting Wnt signals and the systemic hormone growth response of MaSCs, unveiling the intriguing concept that hormones induce a collaborative local niche environment for stem cells.

Working on unveiling the mechanisms of stem cell fate and differentiation? We’d like to hear from you!


Reprogramming-qualified B18R Recombinant Protein, Carrier-free

Reprogramming-qualified B18R Recombinant Protein, Carrier-free is of interest for cellular reprogramming and other applications requiring RNA-mediated gene delivery.  B18R protein is a Vaccinia virus-encoded receptor with specificity for mouse, human, rabbit, pig, rat and cow Type 1 interferons and has potent neutralizing capability acting as a decoy receptor for Type 1 interferons.

Biological Activity

  • Stemfactor B18R Recombinant Protein, Carrier-free bioactivity is demonstrated by the neutralization of IFN-alpha or IFN-beta effects in an assay of IL-12 production from CD40L-activated monocytes.
  • The biological function is validated by down-regulation of gene expression by qRT-PCR of TLR3, IFIT1, and OASI in response to B18R treatment on human fibroblasts to levels equivalent to non-transfected cells.
  • The efficiency of mRNA reprogramming is tested by performing mRNA reprogramming with OKSML on neonatal foreskin fibroblasts and demonstrating greater than 0.5% iPSC colony formation.
NuFF feeder cells plated at at 2.5 x 10E5 cells per well on Day -2. Images were captured 24 hours after plating and represent an appropriate NuFF feeder layer density for plating target cells on Day -1.

NuFF feeder cells plated at at 2.5 x 10E5 cells per well on Day -2.
Images were captured 24 hours after plating and represent an appropriate NuFF feeder layer density for plating target cells on Day -1.

Previously only available as part of the mRNA Reprogramming Kit or microRNA Booster KitReprogramming-qualified B18R Recombinant Protein, Carrier-free is now available individually.

Cost-effective serum replacer for stem cell culture!

Traditionally, Fetal Bovine Serum (FBS) has been used as an additive to cell culture media for the in vitro growth of pluripotent stem cells. FBS is an inherently variable component of the cell culture system, so consistent performance demands extensive screening of manufactured lots. To circumvent this problem, companies began offering “stem cell qualified” serum. One issue with this solution is that the qualification is not always performed on a stem cell line relevant to the researcher’s own cell lines. Years later, researchers began using Life Technologies Knockout® Serum Replacement (KOSR) to grow and maintain undifferentiated human embryonic stem (ES) cells in culture. While KOSR has shown to be more stable than FBS and performs better in maintaining undifferentiated ES and induced pluripotent stem (iPS) cells, it is expensive and many researchers are today looking for a more cost effective media solution for their pluripotent stem cell culture. To address this need in the scientific community, GlobalStem now offers a more economical solution with their new PluriQ™ Serum Replacement. [Read more…]

Validated antibodies for Ectodermal Stem Cell Lineage

Self-renewal and differentiation capacities into multiple cell-types are 2 main characteristics of Stem Cells. Contrarily to Embryonic Stem Cells, Adult Stem Cells (ASC) are already committed to a differentiated lineage. Nevertheless, ASC still retain capacities of generating various cell types within their restricted lineage. It’s thus crucial to be able to access high quality and reliable research tools when tracking cell differentiation. Here, we’ll review the most popular reagents used to characterize the ectodermal lineage.

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The best antibodies to detect FOX transcription factors

FOX transcription factor family members regulate the expression of genes known to play a critical role in embryonic development and organ morphogenesis. These “helix-turn-helix” class of proteins display a common “forkhead” motif and are encoded by Forkhead genes. Recent lines of evidences suggest that FOX proteins are promising therapeutical targets and biomarkers in various areas. A good opportunity to review of the most reliable FOX primary antibodies for research applications!

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Get 1.8 fold more cardiomyocytes with MesoFate medium

The analysis of mouse and human embryonic stem cell differentiation cultures has indicated the existence of a cardiovascular progenitor, one of the earliest stages of mesoderm specification to the cardiovascular lineage. In this post, we’ll look, step-by-step, at a new cardiovascular differentiation experimental procedure starting from human pluripotent Stem Cells.

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FAQs on feeder cells for optimal human iPSC culture

Human Newborn Foreskin Fibroblasts (NuFF cells) are genuine feeder cells for Stem cell research. Mitotically inactive NuFF cells (by irradiation or Mitomycin C chemical treatment) can efficiently maintain healthy undifferentiated human pluripotent cell status and support cell reprogramming. In this post, you’ll find the answers to Frequently Asked Questions collected by tebu-bio’s cell biology experts regarding these feeder layers.

I hope these FAQs will help you in your Stem cell research! Have a good read.

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4 International Standards for pluripotency tests

Stem cell reference standards are Embryonic Reference Standard Cells of the International Stem Cell Initiative (ISCI).  These products are the reference standards to validate the pluripotency status of cells of interest by flow cytometry or gene expression analysis .

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Cell reprogramming strategies for Stem cell research & cell sourcing

Cellular reprogramming is a process by which a fully differentiated cell type with specialized functions, is brought to be transformed into another cell type. This reprogrammed cell type exhibits different characteristics and functions it would not display initially under normal physiological conditions.

[Read more…]