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REACTIVITY SENSITIVITY MW (kDa) Isotype
H M R Endogenous Rabbit IgG
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Confocal immunofluorescent analysis of rat cerebellum using CNPase (D83E10) XP® Rabbit mAb (Alexa Fluor® 647 Conjugate) (blue pseudocolor) and β3-Tubulin (TU-20) Mouse mAb #4466 (green). Red = Propiduim iodide (fluorescent DNA dye).

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Immunofluorescence (Frozen)

A. Solutions and Reagents

NOTE: Prepare solutions with reverse osmosis deionized (RODI) or equivalently purified water.

  1. 20X Phosphate Buffered Saline (PBS): (9808) To prepare 1L 1X PBS: add 50 ml 20X PBS to 950 ml dH2O, mix. Adjust pH to 8.0.
  2. Formaldehyde: 16%, methanol free, Polysciences, Inc. (cat# 18814), use fresh and store opened vials at 4°C in dark, dilute in 1X PBS for use.
  3. Methanol, 100%
  4. Blocking Buffer (1X PBS / 5% normal goat serum (#5425) / 0.3% Triton™ X-100): To prepare 10 ml: add 0.5 ml normal goat serum and 0.5 ml 20X PBS to 9.0 ml dH2O, mix. While stirring, add 30 µl Triton™ X-100.
  5. Antibody Dilution Buffer (1X PBS / 1% BSA / 0.3% Triton X-100): To prepare 10 ml, add 30 µl Triton™ X-100 to 10 ml 1X PBS. Mix well then add 0.1 g BSA (9998), mix.
  6. Prolong® Gold AntiFade Reagent (#9071), Prolong® Gold AntiFade Reagent with DAPI (#8961).

B. Specimen Preparation - Frozen/Cryostat Sections (IF-F)

  1. For fixed frozen tissue proceed with Immunostaining (Section C).
  2. For fresh, unfixed frozen tissue, please fix immediately, as follows:
    1. Cover sections with 4% formaldehyde dilute in 1X PBS.

      NOTE: Formaldehyde is toxic, use only in fume hood.

    2. Allow sections to fix for 15 minutes at room temperature.
    3. Aspirate liquid, rinse three times in 1X PBS for 5 minutes each.
    4. Proceed with Immunostaining (Section C).

C. Immunostaining

NOTE: All subsequent incubations should be carried out at room temperature unless otherwise noted in a humid light-tight box or covered dish/plate to prevent drying and fluorochrome fading.

  1. Methanol Permeabilization Step: Cover tissue sections with ice-cold 100% methanol (use enough to cover completely to a depth of 3–5 mm, DO NOT LET DRY), incubate in methanol for 10 minutes at –20°C, rinse in 1X PBS for 5 minutes.
  2. Block specimen in Blocking Buffer for 60 minutes.
  3. While blocking, prepare primary antibody by diluting as indicated on datasheet in Antibody Dilution Buffer.
  4. Aspirate blocking solution, apply diluted primary antibody.
  5. Incubate overnight at 4°C.
  6. Rinse three times in 1X PBS for 5 minutes each.
  7. Coverslip slides with Prolong® Gold Antifade Reagent (#9071), Prolong® Gold AntiFade Reagent with DAPI (#8961).
  8. For best results examine specimens immediately using appropriate excitation wavelength. For long term storage, store slides flat at 4°C protected from light.

posted November 2006

revised December 2010

protocol id: 464

Product Usage Information

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

CNPase (D83E10) XP® Rabbit mAb (Alexa Fluor® 647 Conjugate) detects endogenous levels of total CNPase protein.


Species Reactivity: Human, Mouse, Rat

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues surrounding Val81 of human CNPase protein.

Product Description

This Cell Signaling Technology antibody is conjugated to Alexa Fluor® 647 fluorescent dye and tested in-house for direct immunofluorescent analysis in rat tissue. The antibody is expected to exhibit the same species cross-reactivity as the unconjugated CNPase (D83E10) XP® Rabbit mAb #5664.


CNPase (2', 3’-cyclic nucleotide 3'-phosphodiesterase) catalyzes the in vitro hydrolysis of 2’, 3’-cyclic nucleotides to produce 2’-nucleotides. The in vivo molecular function and native substrate of this nucleotide phosphodiesterase remains under investigation (1). High CNPase expression is seen in oligodendrocytes and Schwann cells as CNPase accounts for roughly 4% of the total myelin protein in the central nervous system (2). CNPase binds to tubulin heterodimers and plays a role in tubulin polymerization, and oligodendrocyte process outgrowth (3). Typical myelination is seen in CNPase knock-out mice, but they suffer severe neurodegeneration from axonal loss and oligodendrocytes display abnormal paranodal loop structure prior to axonal degeneration. Paranodal loops typically contact the axolemma in axon-glial signaling; neurodegeneration in CNPase knock-out mice is a secondary consequence of impaired cell-cell communication (4).


1.  Esposito, C. et al. (2008) Biochemistry 47, 308-19.

2.  Kozlov, G. et al. (2003) J Biol Chem 278, 46021-8.

3.  Lappe-Siefke, C. et al. (2003) Nat Genet 33, 366-74.

4.  Lee, J. et al. (2005) J Cell Biol 170, 661-73.


Entrez-Gene Id 1267
Swiss-Prot Acc. P09543


For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology® is a trademark of Cell Signaling Technology, Inc.
XP® is a trademark of Cell Signaling Technology, Inc.
The Alexa Fluor® dye antibody conjugates in this product are sold under license from Life Technologies Corporation for research use only, except for use in combination with DNA microarrays. The Alexa Fluor® dyes (except for Alexa Fluor® 430 dye) are covered by pending and issued patents. Alexa Fluor® is a registered trademark of Molecular Probes, Inc.