RosetteSep™ Human Mesenchymal Stem Cell Enrichment Cocktail

Immunodensity negative selection cocktail

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Immunodensity negative selection cocktail
From: 174 USD

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The RosetteSep™ Human Mesenchymal Stem Cell Enrichment Cocktail is designed to isolate mesenchymal stem cells from fresh bone marrow by negative selection. Unwanted cells are targeted for removal with Tetrameric Antibody Complexes recognizing CD3, CD14, CD19, CD38, CD66b and glycophorin A on red blood cells (RBCs). When centrifuged over a buoyant density medium such as Lymphoprep™ (Catalog #07801), the unwanted cells pellet along with the RBCs. The purified mesenchymal stem cells are present as a highly enriched population at the interface between the plasma and the buoyant density medium.
• Fast and easy-to-use
• Requires no special equipment or training
• Untouched, viable cells
  • RosetteSep™ Human Mesenchymal Stem Cell Enrichment Cocktail (Catalog #15128)
    • RosetteSep™ Human Mesenchymal Stem Cell Enrichment Cocktail, 2 mL
  • RosetteSep™ Human Mesenchymal Stem Cell Enrichment Cocktail (Catalog #15168)
    • RosetteSep™ Human Mesenchymal Stem Cell Enrichment Cocktail, 5 x 2 mL
Cell Isolation Kits
Cell Type:
Mesenchymal Stem and Progenitor Cells
Sample Source:
Bone Marrow
Selection Method:
Cell Isolation
Area of Interest:
Stem Cell Biology

Scientific Resources

Educational Materials


Frequently Asked Questions

What is RosetteSep™?

RosetteSep™ is a rapid cell separation procedure for the isolation of purified cells directly from whole blood, without columns or magnets.

How does RosetteSep™ work?

The antibody cocktail crosslinks unwanted cells to red blood cells (RBCs), forming rosettes. The unwanted cells then pellet with the free RBCs when centrifuged over a density centrifugation medium (e.g. Ficoll-Paque™ PLUS, Lymphoprep™).

What factors affect cell recovery?

The temperature of the reagents can affect cell recovery. All reagents should be at room temperature (sample, density centrifugation medium, PBS, centrifuge) before performing the isolations. Layering can also affect recovery so be sure to carefully layer the sample to avoid mixing with the density centrifugation medium as much as possible. Be sure to collect the entire enriched culture without disturbing the RBC pellet. A small amount of density centrifugation medium can be collected without worry.

Which cell samples can RosetteSep™ be used with?

RosetteSep™ can be used with leukapheresis samples, bone marrow or buffy coat, as long as: the concentration of cells does not exceed 5 x 107 per mL (can dilute if necessary); and there are at least 100 RBCs for every nucleated cell (RBCs can be added if necessary).

Can RosetteSep™ be used with previously frozen or cultured cells?

Yes. Cells should be re-suspended at 2 - 5 x 107 cells / mL in PBS + 2% FBS. Fresh whole blood should be added at 250 µL per mL of sample, as a source of red cells.

Can RosetteSep™ be used to enrich progenitors from cord blood?

Yes. Sometimes cord blood contains immature nucleated red cells that have a lower density than mature RBCs. These immature red cells do not pellet over Ficoll™, which can lead to a higher RBC contamination than peripheral blood separations.

Does RosetteSep™ work with mouse cells?

No, but we have developed EasySep™, a magnetic-based cell isolation system which works with mouse and other non-human species.

Which anticoagulant should be used with RosetteSep™?

Peripheral blood should be collected in heparinized Vacutainers. Cord blood should be collected in ACD.

Should the anticoagulant be washed off before using RosetteSep™?

No, the antibody cocktail can be added directly to the sample.
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Product Applications

This product is designed for use in the following research area(s) as part of the highlighted workflow stage(s). Explore these workflows to learn more about the other products we offer to support each research area.

Data and Publications


Cell biology international 2012 JUL

New approach to isolate mesenchymal stem cell (MSC) from human umbilical cord blood.

Hussain I et al.


HUCB (human umbilical cord blood) has been frequently used in clinical allogeneic HSC (haemopoietic stem cell) transplant. However, HUCB is poorly recognized as a rich source of MSC (mesenchymal stem cell). The aim of this study has been to establish a new method for isolating large number of MSC from HUCB to recognize it as a good source of MSC. HUCB samples were collected from women following their elective caesarean section. The new method (Clot Spot method) was carried out by explanting HUCB samples in mesencult complete medium and maintained in 37°C, in a 5% CO2 and air incubator. MSC presence was established by quantitative and qualitative immunophenotyping of cells and using FITC attached to MSC phenotypic markers (CD29, CD73, CD44 and CD105). Haematopoietic antibodies (CD34 and CD45) were used as negative control. MSC differentiation was examined in neurogenic and adipogenic media. Immunocytochemistry was carried out for the embryonic markers: SOX2 (sex determining region Y-box 2), OLIG-4 (oligodendrocyte-4) and FABP-4 (fatty acid binding protein-4). The new method was compared with the conventional Rosset Sep method. MSC cultures using the Clot Spot method showed 3-fold increase in proliferation rate compared with conventional method. Also, the cells showed high expression of MSC markers CD29, CD73, CD44 and CD105, but lacked the expression of specific HSC markers (CD34 and CD45). The isolated MSC showed some differentiation by expressing the neurogenic (SOX2 and Olig4) and adipogenic (FABP-4) markers respectively. In conclusion, HUCB is a good source of MSC using this new technique.
Bone 2008 DEC

Gene expression analysis in osteoblastic differentiation from peripheral blood mesenchymal stem cells.

Valenti MT et al.


MSCs are known to have an extensive proliferative potential and ability to differentiate in various cell types. Osteoblastic differentiation from mesenchymal progenitor cells is an important step of bone formation, though the pattern of gene expression during differentiation is not yet well understood. Here, to investigate the possibility to obtain a model for in vitro bone differentiation using mesenchymal stem cells (hMSCs) from human subjects non-invasively, we developed a method to obtain hMSCs-like cells from peripheral blood by a two step method that included an enrichment of mononuclear cells followed by depletion of unwanted cells. Using these cells, we analyzed the expression of transcription factor genes (runt-related transcription factor 2 (RUNX2) and osterix (SP7)) and bone related genes (osteopontin (SPP1), osteonectin (SPARC) and collagen, type I, alpha 1 (COLIA1)) during osteoblastic differentiation. Our results demonstrated that hMSCs can be obtained from peripheral blood and that they are able to generate CFU-F and to differentiate in osteoblast and adipocyte; in this study, we also identified a possible gene expression timing during osteoblastic differentiation that provided a powerful tool to study bone physiology.
Blood 2007 JUL

Identification of functional endothelial progenitor cells suitable for the treatment of ischemic tissue using human umbilical cord blood.

Nagano M et al.


Umbilical cord blood (UCB) has been used as a potential source of various kinds of stem cells, including hematopoietic stem cells, mesenchymal stem cells, and endothelial progenitor cells (EPCs), for a variety of cell therapies. Recently, EPCs were introduced for restoring vascularization in ischemic tissues. An appropriate procedure for isolating EPCs from UCB is a key issue for improving therapeutic efficacy and eliminating the unexpected expansion of nonessential cells. Here we report a novel method for isolating EPCs from UCB by a combination of negative immunoselection and cell culture techniques. In addition, we divided EPCs into 2 subpopulations according to the aldehyde dehydrogenase (ALDH) activity. We found that EPCs with low ALDH activity (Alde-Low) possess a greater ability to proliferate and migrate compared to those with high ALDH activity (Alde-High). Moreover, hypoxia-inducible factor proteins are up-regulated and VEGF, CXCR4, and GLUT-1 mRNAs are increased in Alde-Low EPCs under hypoxic conditions, while the response was not significant in Alde-High EPCs. In fact, the introduction of Alde-Low EPCs significantly reduced tissue damage in ischemia in a mouse flap model. Thus, the introduction of Alde-Low EPCs may be a potential strategy for inducing rapid neovascularization and subsequent regeneration of ischemic tissues.
Journal of lipid research 2007 AUG

Direct evidence of lipid translocation between adipocytes and prostate cancer cells with imaging FTIR microspectroscopy.

Gazi E et al.


Various epidemiological studies show a positive correlation between high intake of dietary FAs and metastatic prostate cancer (CaP). Moreover, CaP metastasizes to the bone marrow, which harbors a rich source of lipids stored within adipocytes. Here, we use Fourier transform infrared (FTIR) microspectroscopy to study adipocyte biochemistry and to demonstrate that PC-3 cells uptake isotopically labeled FA [deuterated palmitic acid (D(31)-PA)] from an adipocyte. Using this vibrational spectroscopic technique, we detected subcellular locations in a single adipocyte enriched with D(31)-PA using the upsilon(as+s)(C-D)(2+3) (D(31)-PA): upsilon(as+s)(C-H)(2+3) (lipid hydrocarbon) signal. In addition, larger adipocytes were found to consist of a higher percentage of D(31)-PA of the total lipid found within the adipocyte. Following background subtraction, the upsilon(as)(C-D)(2+3) signal illuminated starved PC-3 cells cocultured with D(31)-PA-loaded adipocytes, indicating translocation of the labeled FA. This study demonstrates lipid-specific translocation between adipocytes and tumor cells and the use of FTIR microspectroscopy to characterize various biomolecular features of a single adipocyte without the requirement for cell isolation and lipid extraction.
Experimental cell research 2005 JUL

Contribution of human bone marrow stem cells to individual skeletal myotubes followed by myogenic gene activation.

Lee J-H et al.


Much attention is focused on characterizing the contribution of bone marrow (BM)-derived cells to regenerating skeletal muscle, fuelled by hopes for stem cell-mediated therapy of muscle degenerative diseases. Though physical integration of BM stem cells has been well documented, little evidence of functional commitment to myotube phenotype has been reported. This is due to the innate difficulty in distinguishing gene products derived from donor versus host nuclei. Here, we demonstrate that BM-derived stem cells contribute via gene expression following incorporation to skeletal myotubes. By co-culturing human BM-derived mesenchymal stem cells (MSC) with mouse skeletal myoblasts, physical incorporation was observed by genetic lineage tracing and species-specific immunofluorescence. We used a human-specific antibody against the intermediate filament protein nestin, a marker of regenerating skeletal muscle, to identify functional contribution of MSC to myotube formation. Although nestin expression was never detected in MSC, human-specific expression was detected in myotubes that also contained MSC-derived nuclei. This induction of gene expression following myotube integration suggests that bone marrow-derived stem cells can reprogram and functionally contribute to the muscle cell phenotype. We propose that this model of myogenic commitment may provide the means to further characterize functional reprogramming of MSC to skeletal muscle.