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PhosphoSitePlus® Resource

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Product Includes Quantity Applications Reactivity MW(kDa) Isotype
Phospho-RIP (Ser166) (D1L3S) Rabbit mAb 65746 20 µl
Western Blotting
H 78-82 Rabbit IgG
RIP (D94C12) XP® Rabbit mAb 3493 20 µl
Western Blotting Immunoprecipitation Immunofluorescence Flow Cytometry
H M R Hm Mk 78 Rabbit IgG
Phospho-MLKL (Ser358) (D6H3V) Rabbit mAb 91689 20 µl
Western Blotting
H 54 Rabbit IgG
MLKL (D2I6N) Rabbit mAb 14993 20 µl
Western Blotting
H 54 Rabbit IgG
Cleaved Caspase-3 (Asp175) (5A1E) Rabbit mAb 9664 20 µl
Western Blotting Immunoprecipitation Immunohistochemistry Immunofluorescence Flow Cytometry
H M R Mk 17, 19 Rabbit IgG
Caspase-3 (D3R6Y) Rabbit mAb 14220 20 µl
Western Blotting
H M R Mk 35, 19, 17 Rabbit IgG
Cleaved Caspase-8 (Asp391) (18C8) Rabbit mAb 9496 20 µl
Western Blotting Immunohistochemistry Immunofluorescence Flow Cytometry
H 18, 41, 43 Rabbit IgG
Caspase-8 (D35G2) Rabbit mAb 4790 20 µl
Western Blotting
H M R 10, 57 Rabbit IgG
Anti-rabbit IgG, HRP-linked Antibody 7074 100 µl
Western Blotting

Product Description

The Apoptosis/Necroptosis Antibody Sampler Kit provides an economical means of detecting markers for apoptosis and necroptosis. The kit contains enough primary antibody to perform at least two western blot experiments.

Specificity / Sensitivity

Each antibody in the Apoptosis/Necroptosis Antibody Sampler Kit detects endogenous levels of its target protein. MLKL (D2I6N) Rabbit mAb cross-reacts with a band at 130 kDa in some cell lines. Phospho-MLKL (Ser358) (D6H3V) Rabbit mAb may also react with MLKL when dually phoshorylated at Thr357 and Ser358. Caspase-3 (D3R6Y) Rabbit mAb detects full-length caspase-3 as well as the large subunit (p20) of caspase-3 resulting from cleavage during apoptosis. Cleaved Caspase-3 (Asp175) (5A1) Rabbit mAb detects endogenous levels of the large subunit of caspase-3 but does not detect full-length caspase-3 or other cleaved caspases. Cleaved Caspase-8 (Asp391) (18C8) Rabbit mAb detects human Caspase-8 when cleaved at Asp391 (Isoform A, Asp374 on isoform B). This antibody will detect cleavage products containing the pro-domain with the p18 subunit as well as the p18 subunit alone. Caspase-8 (D35G2) Rabbit mAb detects endogenous levels of total caspase-8, including the p10 subunit of the activated protein. It may also cross-react with overexpressed levels of caspase-10.

Source / Purification

Monoclonal antibodies are produced by immunizing rabbits with synthetic peptides surrounding Leu190 of human RIP1, the carboxy terminus of human MLKL and human caspase-8, amino terminal residues adjacent to Asp175 of human caspase-3 and Asp391 of human caspase-8, a recombinant protein corresponding to the p20 subunit of caspase-3, and phosphopeptides surrounding human Ser166 of human RIP and Ser358 of human MLKL.

Apoptosis is a regulated physiological process leading to cell death (1,2). Caspases, a family of cysteine acid proteases, are central regulators of apoptosis. Caspases are synthesized as inactive zymogens containing a pro-domain followed by large (p20) and small subunits (p10) that are proteolytically processed in a cascade of caspase activity. Initiator caspases (including 8, 9, 10, and 12) are closely coupled to proapoptotic signals. Once activated, these caspases cleave and activate downstream effector caspases (including 3, 6, and 7), which in turn cleave cytoskeletal and nuclear proteins like PARP, α-fodrin, DFF, and lamin A, and induce apoptosis. Cytochrome c released from mitochondria is coupled to the activation of caspase-9, a key initiator caspase. Apoptosis induced through the extrinsic mechanisms involving death receptors in the tumor necrosis factor receptor superfamily activates caspase-8. Activated caspase-8 cleaves and activates downstream effector caspases, such as caspase-1, -3, -6, and -7. Caspase-3 is a critical executioner of apoptosis, as it is either partially or totally responsible for the proteolytic cleavage of many key proteins, such as the nuclear enzyme poly (ADP-ribose) polymerase (PARP).

Necroptosis, a regulated pathway for necrotic cell death, is triggered by a number of inflammatory signals, including cytokines in the tumor necrosis factor (TNF) family, pathogen sensors such as toll-like receptors (TLRs), and ischemic injury (3,4). Necroptosis is negatively regulated by caspase-8 mediated apoptosis in which the kinase RIP/RIPK1 is cleaved (5). Furthermore, necroptosis is inhibited by a small molecule inhibitor of RIP, necrostatin-1 (Nec-1) (6). Research studies show that necroptosis contributes to a number of pathological conditions, and Nec-1 has been shown to provide neuroprotection in models such as ischemic brain injury (7). RIP is phosphorylated at several sites within the kinase domain that are sensitive to Nec-1, including Ser14, Ser15, Ser161, and Ser166 (8). Phosphorylation drives association with RIP3, which is required for necroptosis (9-11). Mixed lineage kinase domain-like protein (MLKL) is a pseudokinase that was identified as downstream target of RIP3 in the necroptosis pathway (12). During necroptosis RIP3 is phosphorylated at Ser227, which recruits MLKL and leads to its phosphorylation at Thr357 and Ser358 (12). Knockdown of MLKL through multiple mechanisms results in inhibition of necroptosis (13). While the precise mechanism for MLKL-induced necroptosis is unclear, some studies have shown that necroptosis leads to oligomerization of MLKL and translocation to the plasma membrane, where it effects membrane integrity (14-17).

1.  Degterev, A. et al. (2003) Oncogene 22, 8543-67.

2.  Green, D.R. (1998) Cell 94, 695-8.

3.  Christofferson, D.E. and Yuan, J. (2010) Curr Opin Cell Biol 22, 263-8.

4.  Kaczmarek, A. et al. (2013) Immunity 38, 209-23.

5.  Lin, Y. et al. (1999) Genes Dev 13, 2514-26.

6.  Degterev, A. et al. (2008) Nat Chem Biol 4, 313-21.

7.  Degterev, A. et al. (2005) Nat Chem Biol 1, 112-9.

8.  Ofengeim, D. and Yuan, J. (2013) Nat Rev Mol Cell Biol 14, 727-36.

9.  Cho, Y.S. et al. (2009) Cell 137, 1112-23.

10.  He, S. et al. (2009) Cell 137, 1100-11.

11.  Zhang, D.W. et al. (2009) Science 325, 332-6.

12.  Sun, L. et al. (2012) Cell 148, 213-27.

13.  Wu, J. et al. (2013) Cell Res 23, 994-1006.

14.  Cai, Z. et al. (2014) Nat Cell Biol 16, 55-65.

15.  Chen, X. et al. (2014) Cell Res 24, 105-21.

16.  Wang, H. et al. (2014) Mol Cell 54, 133-46.

17.  Dondelinger, Y. et al. (2014) Cell Rep 7, 971-81.

Entrez-Gene Id 836 , 841 , 197259 , 8737
Swiss-Prot Acc. P42574 , Q14790 , Q8NB16 , Q13546

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.

Apoptosis/Necroptosis Antibody Sampler Kit