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REACTIVITY SENSITIVITY MW (kDa) Isotype
H Endogenous Rabbit IgG
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Flow Cytometry

Flow cytometric analysis of Daudi cells (blue) and MCF7 cells (green) using ARC (D7Q3G) Rabbit mAb (PE Conjugate) (solid lines) or a concentration-matched Rabbit (DA1E) mAb IgG XP® Isotype Control (PE Conjugate) #5742 (dashed lines).

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Flow Cytometry, Methanol Permeabilization Protocol for Direct Conjugates

A. Solutions and Reagents

NOTE: Prepare solutions with reverse osmosis deionized (RODI) or equivalent grade water.

  1. 20X Phosphate Buffered Saline (PBS): (#9808) To prepare 1 L 1X PBS: add 50 ml 20X PBS to 950 ml dH2O, mix.
  2. 16% Formaldehyde (methanol free).
  3. 100% methanol.
  4. Incubation Buffer: Dissolve 0.5 g Bovine Serum Albumin (BSA) (#9998) in 100 ml 1X PBS. Store at 4°C.

B. Fixation

NOTE: If using whole blood, lyse red blood cells and wash by centrifugation prior to fixation.

  1. Collect cells by centrifugation and aspirate supernatant.
  2. Resuspend cells in 0.5-1 ml 1X PBS. Add formaldehyde to obtain a final concentration of 4%.
  3. Fix for 15 min at room temperature.
  4. Wash by centrifugation with excess 1X PBS. Discard supernatant in appropriate waste container. Resuspend cells in 0.5-1 ml 1X PBS.

C. Permeabilization

  1. Permeabilize cells by adding ice-cold 100% methanol slowly to pre-chilled cells, while gently vortexing, to a final concentration of 90% methanol.
  2. Incubate 30 min on ice.
  3. Proceed with immunostaining (Section D) or store cells at -20°C in 90% methanol.

D. Immunostaining

  1. Aliquot desired number of cells into tubes or wells.
  2. Wash cells by centrifugation in excess 1X PBS to remove methanol. Discard supernatant in appropriate waste container. Repeat if necessary.
  3. Resuspend cells in 100 µl of diluted antibody conjugate (prepared in incubation buffer at the recommended dilution).
  4. Incubate for 1 hr at room temperature. Protect from light.
  5. Wash by centrifugation in incubation buffer. Discard supernatant. Repeat.
  6. Resuspend cells in 1X PBS and analyze on flow cytometer; alternatively, for DNA staining, proceed to optional DNA stain (Section E).

E. Optional DNA Dye

  1. Resuspend cells in 0.5 ml of DNA dye (e.g. Propidium Iodide (PI)/RNase Staining Solution #4087).
  2. Incubate for at least 5 min at room temperature.
  3. Analyze cells in DNA staining solution on flow cytometer.

posted July 2009

revised June 2017

Protocol Id: 407

Product Usage Information

Application Dilutions
Flow Cytometry 1:50

Storage: Supplied in PBS (pH 7.2), less than 0.1% sodium azide and 2 mg/ml BSA. Store at 4°C. Do not aliquot the antibody. Protect from light. Do not freeze.

Specificity / Sensitivity

ARC (D7Q3G) Rabbit mAb (PE Conjugate) recognizes endogenous levels of total ARC protein.


Species Reactivity: Human

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues surrounding Pro125 of human ARC protein, specific to a region encoded by isoform 2 of the NOL3 gene.

Product Description

This Cell Signaling Technology antibody is conjugated to phycoerythrin (PE) and tested in-house for direct flow cytometric analysis in human cells. This antibody is expected to exhibit the same species cross-reactivity as the unconjugated ARC (D7Q3G) Rabbit mAb #38916.


Apoptosis repressor with caspase recruitment domain (ARC), also independently identified as muscle-enriched cytoplasmic protein (MYP), is a CARD domain protein that regulates apoptosis (1). The ARC protein CARD domain is highly homologous to those in other cell death regulators, including caspase-2, caspase-9, RAIDD, and Apaf-1 (2). The NOL3 gene encodes both the cytoplasmic ARC protein and a 30 kDa nucleolar protein (Nop30) that is involved in RNA splicing. ARC is encoded from isoform 2 of NOL3, while isoform 1 produced by alternative splicing encodes Nop30. Both ARC and Nop30 proteins share common amino-terminal sequences (3). Research studies show that ARC can bind to caspase-8 and caspase-2 and inhibit apoptosis through extrinsic pathways that involve the receptor proteins Fas, TNFR1, and DR3 (1). Additional research indicates that the ARC anti-apoptotic mechanism may include both intrinsic (mitochondrial) and extrinsic (death receptor) pathways (4). In addition to binding caspases, ARC can disrupt the interaction with the death domains of Fas and FADD, which inhibits death-inducing signaling complex (DISC) assembly. The CARD domain of ARC can inhibit intrinsic apoptosis through binding to the pro-apoptotic Bax protein (5). Phosphorylation of ARC at Thr149 by CK2 is required for targeting of ARC to the mitochondria (6). ARC is able to suppress necroptosis, a programmed pathway of necrosis triggered by blocking the recruitment of RIP1 to TNFR1 (7). Expression of ARC protein is predominantly seen in terminally differentiated cells under normal conditions and is markedly induced in a variety of cancers including pancreatic, colorectal, breast, lung, glioblastoma, liver, kidney, melanoma, and acute myeloid leukemia (1, 8-12).


1.  Koseki, T. et al. (1998) Proc Natl Acad Sci U S A 95, 5156-60.

2.  Hofmann, K. et al. (1997) Trends Biochem Sci 22, 155-6.

3.  Stoss, O. et al. (1999) J Biol Chem 274, 10951-62.

4.  Nam, Y.J. et al. (2004) Mol Cell 15, 901-12.

5.  Gustafsson, A.B. et al. (2004) J Biol Chem 279, 21233-8.

6.  Li, P.F. et al. (2002) Mol Cell 10, 247-58.

7.  Kung, G. et al. (2014) Cell Death Differ 21, 634-44.

8.  Mercier, I. et al. (2008) Cell Cycle 7, 1640-7.

9.  Wang, M. et al. (2005) FEBS Lett 579, 2411-5.

10.  Mercier, I. et al. (2005) Cell Death Differ 12, 682-6.

11.  Chen, L.H. et al. (2008) Cancer Res 68, 834-42.

12.  Carter, B.Z. et al. (2011) Blood 117, 780-7.


Entrez-Gene Id 8996
Swiss-Prot Acc. O60936


For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
XP is a registered trademark of Cell Signaling Technology, Inc.

89210
ARC (D7Q3G) Rabbit mAb (PE Conjugate)