Cell Signaling Technology

Product Pathways - Apoptosis

FLIP (D16A8) Rabbit mAb #8510

Applications Reactivity Sensitivity MW (kDa) Isotype
W IP H M R Endogenous 55 Rabbit IgG

Applications Key:  W=Western Blotting  IP=Immunoprecipitation
Reactivity Key:  H=Human  M=Mouse  R=Rat
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.

Protocols

Specificity / Sensitivity

FLIP (D16A8) Rabbit mAb recognizes endogenous levels of total FLIP protein. This antibody also detects the short isoform of FLIP, FLIPS. The antibody detects a band of unknown originat around 70 kDa.

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues surrounding His160 of human FLIP protein.

Western Blotting

Western Blotting

Western blot analysis of extracts from various cell lines using FLIP (D16A8) Rabbit mAb.

Western Blotting

Western Blotting

Western blot analysis of extracts from 293T cells, mock transfected (-) or transfected with human FLIP (hFLIP, +), using FLIP (D16A8) Rabbit mAb.

Background

Cellular FLIP (FLICE inhibitory protein) is a regulator of apoptosis that has various names, such as c-FLIP (1), Casper (2), CLARP (3), FLAME (4), I-FLICE (5), MRIT (6), CASH (7), and Usurpin (8). FLIP is expressed as two alternative splice isoforms, FLIP short (FLIPS) and FLIP long (FLIPL). FLIPS contains two death effector domains (DEDs) like those found on the death receptor adaptor protein FADD and the pro-domain of caspase-8. FLIPL shares significant homology with caspase-8 (FLICE), and contains an additional death effector domain, but FLIPL lacks the catalytic active site of the caspases and does not have protease activity. Both FLIP isoforms have been reported to interact with FADD and pro-caspase-8. The role of FLIP in apoptosis is controversial as some research studies have reported it to be anti-apoptotic, while others claim that it is pro-apoptotic. Overexpression of FLIPL can lead to caspase-8 heterodimers that produce an active protease, resulting in apoptosis. However, at physiological levels, it is thought that the binding of FLIP to the DED of FADD results in inhibition of caspase-8 processing. Reduction of FLIP by siRNA or gene targeting sensitizes cells to death receptor-mediated apoptosis. FLIP has also been implicated in the resistance of cancer cells to apoptosis and is upregulated in some cancer types including Hodgkin's lymphoma and ovarian and colon carcinomas (9).

  1. Irmler, M. et al. (1997) Nature 388, 190-195.
  2. Shu, H. B. et al. (1997) Immunity 6, 751-763.
  3. Inohara, N. et al. (1997) Proc. Natl. Acad. Sci. USA 94, 10717-10722.
  4. Srinivasula, S. M. et al. (1997) J. Biol. Chem. 272, 18542-18545.
  5. Hu, S. et al. (1997) J. Biol. Chem. 272, 17255-17257.
  6. Han, D. K. et al. (1997) Proc. Natl. Acad. Sci. USA 94, 11333-11338.
  7. Dita, R. M. et al. (1998) Cell Death Differ. 5, 271-288.
  8. Goltsev, Y. V. et al. (1997) J. Biol. Chem. 272, 19641-19644.
  9. Kataoka, T. (2005) Crit. Rev. Immunol. 25, 31-58.

Application References

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Companion Products

For Research Use Only. Not For Use In Diagnostic Procedures.

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