CD9/CD9 Exosome ELISA Kit (Canine)

Cosmo Bio LTD

Catalog No: HAK-DEL0909-1

Exosomes are small vesicles with a diameter of 30 to 200 nm that are secreted from almost all cells that make up the body, and are present in all body fluids such as blood and urine ^(1)-(5) . They are also secreted in vitro into the culture supernatant of animal cells. Like cells, exosomes are surrounded by a lipid bilayer membrane, with membrane proteins present on their surface and proteins and microRNAs contained inside. It is thought that exosomes are responsible for intercellular communication through the function of these proteins and microRNAs in target cells that have taken up exosomes ⁽⁶⁾ . One of the structural characteristics of exosomes is the tetraspanin family that is present on the surface. In dogs, CD9 and CD63 are members of this family and exist as surface markers for exosomes ^(7),(8) .
 Methods for quantifying exosomes include the amount of protein contained in exosomes and particle analysis using the nanotracking method ⁽⁹⁾ , but these methods require exosomes to be purified first by ultracentrifugation or other methods. There are very limited means to directly quantify exosomes in body fluids or cell culture media, and no general method has been developed to date.
 This kit uses a two-step sandwich ELISA with high-performance antibodies against the exosome markers canine CD9 and CD63, allowing for the relative quantification of exosomes bearing canine CD9 and CD63 molecules on their surface.

• Click here for ELISA kits for CD9, CD63, and CD81 for quantifying human exosomes

Features

• Exosomes contained in blood samples, cell culture supernatants, etc. can be directly quantified.
• No special equipment is required; measurements can be performed with a standard plate reader (wavelength 450 nm).
• We use stabilized exosomes derived from AZ-ACU (canine urothelial carcinoma cells) as a standard reagent.
• Relative quantification of each sample is possible by normalizing with the exosome standard.
• Exosomes are captured using immobilized canine CD9 and CD63 antibodies and detected using HRP-labeled canine CD9 and CD63 antibodies.

Kit components

1. Anti-dog CD9 ^*1 antibody immobilized 96 well plate 8-well x 12 strips 1 sheet
2. Exosome Standard 4 bottles ^*2
3. Assay buffer 25mL x 1
4. Washing buffer (10X) 25mL x 1
5. HRP-labeled anti-dog CD9 ^*1 antibody (500X) 20μL 1 bottle
6. Substrate solution 12mL x 1
7. Stop solution (2N H ₂ SO ₄ ) 6mL 1 bottle
8. Plate seal x 2

*1: Product number: HAK-DEL6363-1 is CD63
*2: n=2, 4 calibration curves

Example data

Fig. 1 Standard curve by CD9/CD9 ELISA

Fig. 2 Standard curve by CD63/CD63 ELISA

 

(The absorbance of each standard protein concentration minus the blank absorbance is plotted.)

References

1. J. Skog, T. Wurdinger, S. van Rijn, DH Meijer, L. Gainche, M. Sena-Esteves, WT Jr. Curry, BS Carter, AM Krichevsky and XO Breakefield: Nat Cell Biol., 10, 1470 (2008 ).
2. T. Pisitkun, RF Shen and MA Knepper: Proc Natl Acad Sci USA., 101, 13368 (2004).
3. S. Runz, S. Keller, C. Rupp, A. Stoeck, Y. Issa, D. Koensgen, A. Mustea, J. Sehouli, G. Kristiansen and P. Altevogt: Gynecol Oncol., 107, 563 (2007) .
4. S. Keller, AK Konig, F. Marme, S. Runz, S. Wolterink, D. Koensgen, A. Mustea, J. Sehouli and P. Altevogt: Cancer Lett., 278, 73 (2009).
5. C. Lasser, V. Seyed AlikhS. Gabrielsson, J. Lotvall and H. Valadi: J Transl Med., 9, 9 (2011).
6. Y. Naito, Y. Yoshioka, Y. Yamamoto and T. Ochiya: Cell Mol Life Sci., 74, 697 (2017).
7. EJ Fish, KJ Irizarry, P. DeInnocentes, et al.: BMC Cancer., 18, 832 (2018).
8. MA Rojas, BB Rentzsch, J. Plendl, et. al.: BMC Vet Res., 14, 179 (2018).
9. V. Filipe, A. Hawe and W. Jiskoot: Pharm Res ., 27 , 796 (2010).