RosetteSep™ Human Monocyte Enrichment Cocktail

Immunodensity negative selection cocktail

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Immunodensity negative selection cocktail
From: 170 USD


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The RosetteSep™ Human Monocyte Enrichment Cocktail is designed to isolate monocytes from whole blood by negative selection. Unwanted cells are targeted for removal with Tetrameric Antibody Complexes (TAC) recognizing non-monocyte cells and 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 monocytes 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
• Isolated cells are untouched
• Can be combined with SepMate™ for consistent, high-throughput sample processing
  • RosetteSep™ Human Monocyte Enrichment Cocktail (Catalog #15028)
    • RosetteSep™ Human Monocyte Enrichment Cocktail, 2 mL
  • RosetteSep™ Human Monocyte Enrichment Cocktail (Catalog #15068)
    • RosetteSep™ Human Monocyte Enrichment Cocktail, 5 x 2 mL
Cell Isolation Kits
Cell Type:
Sample Source:
Buffy Coat; Whole Blood
Selection Method:
Cell Isolation
Area of Interest:

Technical 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


FACS Histogram Results Using RosetteSep™ Human Monocyte Enrichment Cocktail

Figure 1. FACS Histogram Results Using RosetteSep™ Human Monocyte Enrichment Cocktail

Starting with fresh peripheral blood, the CD14+ cell content of the enriched fraction is typically 72% - 85%. *Note: Red blood cells were removed by lysis prior to flow cytometry.


The Journal of infectious diseases 2016 AUG

During HCV and HCV-HIV infection elevated plasma Autotaxin is associated with LPA and markers of immune activation that normalize during IFN-free HCV therapy.

Kostadinova L et al.


BACKGROUND Immune activation predicts morbidity during HCV and HIV infection, though mechanisms underlying immune activation are unclear. Plasma autotaxin and its enzymatic product, lysophosphatidic-acid (LPA), are elevated during HCV infection, and LPA activates immunocytes, but whether this contributes to immune activation is unknown. METHODS We evaluated plasma autotaxin, IL-6, sCD14, sCD163, and Mac2-Binding Protein (Mac2BP) during HCV, HIV and HCV-HIV infection, and in uninfected controls, before and after HIV ART and IFN-free HCV therapy. RESULTS We observed greater plasma autotaxin levels in HCV and HCV-HIV-infected compared to uninfected participants, primarily those with higher AST/PLT ratio index. Autotaxin levels correlated with IL-6, sCD14, sCD163, Mac2BP, and LPA in HCV-infected, and with Mac2BP in HCV-HIV-infected participants, while in HIV infection sCD14 correlated with Mac2BP. Autotaxin, LPA and sCD14 levels normalized, while sCD163 and Mac2BP levels partially normalized within 6 months of starting IFN-free HCV therapy. sCD163 and IL-6 levels normalized within 6 months of starting HIV ART. In vitro, LPA activated monocytes. CONCLUSION These data indicate elevated autotaxin levels and soluble markers of immune activation during HCV infection are partially reversible within 6 months of IFN-free HCV treatment, and autotaxin may be causally linked to immune activation during HCV and HCV-HIV infection.
Journal of immunology (Baltimore, Md. : 1950) 2016 AUG

Downregulation of the Syk Signaling Pathway in Intestinal Dendritic Cells Is Sufficient To Induce Dendritic Cells That Inhibit Colitis.

Hang L et al.


Helminthic infections modulate host immunity and may protect people in less-developed countries from developing immunological diseases. In a murine colitis model, the helminth Heligmosomoides polygyrus bakeri prevents colitis via induction of regulatory dendritic cells (DCs). The mechanism driving the development of these regulatory DCs is unexplored. There is decreased expression of the intracellular signaling pathway spleen tyrosine kinase (Syk) in intestinal DCs from H. polygyrus bakeri-infected mice. To explore the importance of this observation, it was shown that intestinal DCs from DC-specific Syk(-/-) mice were powerful inhibitors of murine colitis, suggesting that loss of Syk was sufficient to convert these cells into their regulatory phenotype. DCs sense gut flora and damaged epithelium via expression of C-type lectin receptors, many of which signal through the Syk signaling pathway. It was observed that gut DCs express mRNA encoding for C-type lectin (CLEC) 7A, CLEC9A, CLEC12A, and CLEC4N. H. polygyrus bakeri infection downmodulated CLEC mRNA expression in these cells. Focusing on CLEC7A, which encodes for the dectin-1 receptor, flow analysis showed that H. polygyrus bakeri decreases dectin-1 expression on the intestinal DC subsets that drive Th1/Th17 development. DCs become unresponsive to the dectin-1 agonist curdlan and fail to phosphorylate Syk after agonist stimulation. Soluble worm products can block CLEC7A and Syk mRNA expression in gut DCs from uninfected mice after a brief in vitro exposure. Thus, downmodulation of Syk expression and phosphorylation in intestinal DCs could be important mechanisms through which helminths induce regulatory DCs that limit colitis.
The Virology Journal 2015

HIV infection and antiretroviral therapy lead to unfolded protein response activation

Borsa M et al.


BACKGROUND: The unfolded protein response (UPR) is one of the pathways triggered to ensure quality control of the proteins assembled in the endoplasmic reticulum (ER) when cell homeostasis is compromised. This mechanism is primarily composed of three transmembrane proteins serving as stress sensors: PKR-like ER kinase (PERK), activating transcription factor 6 (ATF6), and inositol-requiring enzyme 1 (IRE1). These three proteins' synergic action elicits translation and transcriptional downstream pathways, leading to less protein production and activating genes that encode important proteins in folding processes, including chaperones. Previous reports showed that viruses have evolved mechanisms to curtail or customize this UPR signaling for their own benefit. However, HIV infection's effect on the UPR has scarcely been investigated. METHODS: This work investigated UPR modulation by HIV infection by assessing UPR-related protein expression under in vitro and in vivo conditions via Western blotting. Antiretroviral (ARV) drugs' influence on this stress response was also considered. RESULTS: In in vitro and in vivo analyses, our results confirm that HIV infection activates stress-response components and that ARV therapy contributes to changes in the UPR's activation profile. CONCLUSIONS: This is the first report showing UPR-related protein expression in HIV target cells derived directly from HIV-infected patients receiving different ARV therapies. Thus, two mechanisms may occur simultaneously: interference by HIV itself and the ARV drugs' pharmacological effects as UPR activators. New evidence of how HIV modulates the UPR to enhance its own replication and secure infection success is also presented.
Toxins 2013 NOV

Effects of vitamin D3, calcipotriol and FTY720 on the expression of surface molecules and cytolytic activities of human natural killer cells and dendritic cells.

Al-Jaderi Z and Maghazachi AA


We describe here the effects of three drugs that are either approved or have the potential for treating multiple sclerosis (MS) patients through the in vitro activities of human natural killer (NK) cells and dendritic cells (DCs). Our results indicate that 1,25(OH)2D3, the biologically active metabolite of vitamin D3, calcipotriol and FTY720 augment IL-2-activated NK cell lysis of K562 and RAJI tumor cell lines as well as immature (i) and mature (m) DCs, with variable efficacies. These results are corroborated with the ability of the drugs to up-regulate the expression of NK cytotoxicity receptors NKp30 and NKp44, as well as NKG2D on the surfaces of NK cells. Also, they down-regulate the expression of the killer inhibitory receptor CD158. The three drugs down-regulate the expression of CCR6 on the surface of iDCs, whereas vitamin D3 and calcipotriol tend to up-regulate the expression of CCR7 on mDCs, suggesting that they may influence the migration of DCs into the lymph nodes. Finally, vitamin D3, calcipotriol and FTY720 enhance NK17/NK1 cell lysis of K562 cells, suggesting that a possible mechanism of action for these drugs is via activating these newly described cells. In conclusion, our results show novel mechanisms of action for vitamin D3, calcipotriol and FTY720 on cells of the innate immune system.

An inflammation loop orchestrated by S100A9 and Calprotectin is critical for development of arthritis

Cesaro A et al.


OBJECTIVE: The S100A9 and S100A8 proteins are highly expressed by neutrophils and monocytes and are part of a group of damage-associated molecular pattern molecules that trigger inflammatory responses. Sera and synovial fluids of patients with rheumatoid arthritis (RA) contain high concentrations of S100A8/A9 that correlate with disease activity.$n$nMETHODS: In this study, we investigated the importance of S100A9 in RA by using neutralizing antibodies in a murine lipopolysaccharide-synchronized collagen-induced arthritis model. We also used an in vitro model of stimulation of human immune cells to decipher the role played by S100A9 in leukocyte migration and pro-inflammatory cytokine secretion.$n$nRESULTS: Treatment with anti-S100A9 antibodies improved the clinical score by 50%, diminished immune cell infiltration, reduced inflammatory cytokines, both in serum and in the joints, and preserved bone/collagen integrity. Stimulation of neutrophils with S100A9 protein led to the enhancement of neutrophil transendothelial migration. S100A9 protein also induced the secretion by monocytes of proinflammatory cytokines like TNF$, IL-1$ and IL-6, and of chemokines like MIP-1$ and MCP-1.$n$nCONCLUSION: The effects of anti-S100A9 treatment are likely direct consequences of inhibiting the S100A9-mediated promotion of neutrophil transmigration and secretion of pro-inflammatory cytokines from monocytes. Collectively, our results show that treatment with anti-S100A9 may inhibit amplification of the immune response and help preserve tissue integrity. Therefore, S100A9 is a promising potential therapeutic target for inflammatory diseases like rheumatoid arthritis for which alternative therapeutic strategies are needed.
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