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Purified Rat IgG2a κ Isotype Control
Product Details
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BD Pharmingen™
Rat LOU, also known as Louvain, LOU/C, LOU/M IgG2a, κ
Mouse Pooled Immunoglobulin
Isotype control (Routinely Tested), Immunohistochemistry-formalin (antigen retrieval required), Immunohistochemistry-frozen, Immunohistochemistry-zinc-fixed (Tested During Development)
0.5 mg/ml
Aqueous buffered solution containing ≤0.09% sodium azide.

Preparation And Storage

The monoclonal antibody was purified from tissue culture supernatant or ascites by affinity chromatography. Store undiluted at 4°C.

Recommended Assay Procedures

Immunocytochemistry: The ICC format of the purified R35-95 antibody (Cat. No. 559073) is an immunoglobulin isoytpe control for Rat IgG2a and can be used to help determine the level of non-specific background staining in an indirect cytokine immunocytochemical assay. Purified R35-95 antibody should be utilized at the same concentration as the primary specific antibody and visualized under the same conditions via a three step staining procedure in combination with Biotin Goat Anti-Rat IgG (Cat. No. 559286) and Streptavidin-Horseradish peroxidase. A detailed protocol for the cytokine immunocytochemical procedure is found below.



1. Fixation Buffer: 5% formalin (10% formalin, CMS, Cat. #245-684) is dissolved in phosphate buffered-saline (PBS) (Bacto  FA Buffer, Difco Laboratories, Cat. # 2314-15-0) or BD Pharmingen™ ICC Fixation Buffer (Cat. No. 550010).

2. Endogenous Peroxidase Blocking Buffer: DAKO Peroxidase Blocking Reagent (DAKO, Cat. #S2001).

3. Endogenous Biotin Blocking Buffer: Biotin/Avidin Blocking Kit (Vector Laboratories, Cat. #SP-2001).

4. Antibody dilution buffer: BD Pharmingen's Antibody Diluent for IHC, Cat. No. 559148, supplemented with saponin

5. Microscopic slides: Adhesion Slides (Erie Scientific Company, Cat. #ER-202B-AD) or for cytospins, Colorfrost /Plus slides (Fisher, Cat. #12-550-17).

6. Second-step antibody: Biotin Goat anti-Rat IgG (Cat. No. 559286)

7. Detection system: BD™ Pharmingen Streptavidin Horseradish peroxidase (HRP) Cat No. 550946.

8. BD Pharmingen™ DAB Substrate Kit (contains Diaminobenzidine tetra hydrochloride),  Cat. No. 550880

9. Mounting medium for short-term storage: Aqua-mount  (Lerner Laboratories, Cat. #13800).


This procedure describes the immunoenzymatic technique of staining cytokines within individual cells that are immobilized on microscopic slides via adherence (adherent slides) or centrifugation (cytospins).  


1. Harvest cells and wash them twice in PBS using centrifugation (400 x g for 5 min) to remove residual protein.

2. Adjust the cell concentration at 4-5x10^6 cells/ml in PBS.

3. Place 20 µl of the cell suspension in each well of the adhesion slides and let them adhere at room temperature (RT) for 20 min. Please note that the slides should be washed in PBS at RT for 5 min before transferring the cells.

4. Fix cells on slides using fixation buffer for 15 min at RT.

5. Wash slides 2X in PBS with 5 min incubations.

6. Block slides with PBS supplemented with 1% (w/v) BSA (Sigma, Cat. #A43-78) for 30 min at RT or 10 min at 37°C.

7. Wash slides 2X in PBS and proceed with staining or air dry them and store them at -80°C for future use.

8. Incubate slides with 20 µl of 1% goat serum and PBS with 0.1% (w/v) saponin for 30 min at RT.

9. Wash slides 2X with PBS with 5 min incubations.

10. Block endogenous peroxidase activity with Endogenous Peroxidase Blocking Buffer (20 µl/well) for 10 min at RT.

11. Wash 2X in PBS with 5 min incubations.

12. Incubate each well with Avidin (20 µl/well) for 15 min.

13. Wash 2X in PBS with 5 min incubations.

14. Incubate each well with Biotin (20 µl/well) for 15 min.

15. Wash 2X in PBS with 5 min incubations.

16. Incubate each well for 1 hr at RT with 20 µl of purified cytokine-specific antibody or appropriate immunoglobulin isotype control diluted in Pharmingen's IHC Diluent Buffer supplemented with saponin.

17. Wash slides 2X in PBS with 5 min incubations.

18. Incubate each well with 20 µl of a biotinylated secondary antibody diluted in IHC Diluent Buffer for 30 min at RT.

19. Wash 2X in PBS with 5 min incubations.

20. Apply 20 µl of Streptavidin-HRP (BD Cat. No. 550946) to each well on slides and incubate for 30 min at RT.

21. Wash slides 2X with PBS with 5 minutes incubations.

22. Incubate with DAB Substrate as per the product insert for less than 5 min at RT.

23. Stop the development of the color reaction by washing with PBS.

24. The slides are subsequently mounted in short-term storage mounding medium.


1. Assemble the Cytospin's sample chamber (e.g. Cytospin 3, Shandon, UK or comparable centrifuge), filter card, slide and cytospin racks according to manufacturer's specifications.

2. Load 40 µl of approximately 1 x 10^6 cells to each sample chamber.

3. Spin slides at 600 rpm for 2 min.

4. Take slides out of the cytospin rack and place them on a staining rack.

5. For fixation and staining please follow the steps 4 through 24 specified above for staining cells on adhesion slides.

Product Notices

  1. Since applications vary, each investigator should titrate the reagent to obtain optimal results.
  2. Please refer to for technical protocols.
  3. Caution: Sodium azide yields highly toxic hydrazoic acid under acidic conditions. Dilute azide compounds in running water before discarding to avoid accumulation of potentially explosive deposits in plumbing.
559073 Rev. 3
Antibody Details
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The R35-95 hybridoma was generated by hybridization of Y3 myeloma cells with spleen cells from LOU rats immunized with mouse immunoglobulins. The R35-95 hybridoma produces rat IgG2a, κ immunoglobulin that has no measurable reactivity with mouse immunoglobulins. The R35-95 immunoglobulin was selected as an isotype control following screening for low background binding on a variety of mouse and human tissues.

559073 Rev. 3
Format Details
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Tissue culture supernatant is purified by either protein A/G or affinity purification methods. Both methods yield antibody in solution that is free of most other soluble proteins, lipids, etc. This format provides pure antibody that is suitable for a number of downstream applications including: secondary labeling for flow cytometry or microscopy, ELISA, Western blot, etc.
559073 Rev.3
Citations & References
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View product citations for antibody "559073" on CiteAb

Development References (2)

  1. Hsu SM, Raine L, Fanger H. A comparative study of the peroxidase-antiperoxidase method and an avidin-biotin complex method for studying polypeptide hormones with radioimmunoassay antibodies. Am J Clin Pathol. 1981; 75(5):734-738. (Methodology). View Reference
  2. Hsu SM, Raine L, Fanger H. Use of avidin-biotin-peroxidase complex (ABC) in immunoperoxidase techniques: a comparison between ABC and unlabeled antibody (PAP) procedures. J Histochem Cytochem. 1981; 29(4):577-580. (Methodology). View Reference
559073 Rev. 3

Please refer to Support Documents for Quality Certificates

Global - Refer to manufacturer's instructions for use and related User Manuals and Technical data sheets before using this products as described

Comparisons, where applicable, are made against older BD Technology, manual methods or are general performance claims.  Comparisons are not made against non-BD technologies, unless otherwise noted.

For Research Use Only. Not for use in diagnostic or therapeutic procedures.

Refer to manufacturer's instructions for use and related User Manuals and Technical Data Sheets before using this product as described.

Comparisons, where applicable, are made against older BD technology, manual methods or are general performance claims. Comparisons are not made against non-BD technologies, unless otherwise noted.