Cathepsin K Activity Fluorometric Assay Kit

Catalog #: K141 | abID: ab126780

Product Details

abID ab126780
Cat # +Size K141-100
Size 100 assays
Detection Method Fluorescence (Ex/Em 400/505)
Species Reactivity Mammalian
Applications Detects alternative proteolytic enzymes such as the lysosomal cathepsin proteases that can initiate or propagate proapoptotic signals.
Features & Benefits • Simple one-step procedure; takes only 1-2 hours
• Fast and convenient
• Cathepsin-K assay is straightforward, and can be adapted to 96-well plate assays.
Kit Components • CK Cell Lysis Buffer
• CK Reaction Buffer
• CK Substrate Ac-LR-AFC (10 mM)
• CK Inhibitor (1 mM)
Storage Conditions -20°C
Shipping Conditions Gel Pack
USAGE For Research Use Only! Not For Use in Humans.


Apoptosis can be mediated by mechanisms other than the traditional caspase-mediated cleavage cascade. There is growing recognition that alternative proteolytic enzymes such as the lysosomal cathepsin proteases may initiate or propagate proapoptotic signals. Cathepsins are lysosomal enzymes that are also used as sensitive markers in various toxicological investigations. The Cathepsin-K Activity Assay kit is a fluorescence-based assay that utilizes the preferred cathepsin-K substrate sequence LR labeled with AFC (amino-4-trifluoromethyl coumarin). Cell lysates or other samples that contain cathepsin-K will cleave the synthetic substrate LR-AFC to release free AFC. The released AFC can easily be quantified using a fluorometer or fluorescence plate reader.

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How should tissue lysates be prepared?
We have never tested this kit on tissue samples. However, if you want to test, you could homogenize the tissue in Cell Lysis buffer, preferably using a Dounce homogenizer. Centrifuge the lysate and use the supernatant for the assay.
Will this kit work with mouse or rat samples?
This kit is compatible with all mammalian samples including mouse and rat.
Can we interchange the buffer from this kit with K143?
Each buffer is of different composition and they cannot be used 
Can the kit work on bacteria or yeast cells?
The kit has been standardized for mammalian cells only
What is the exact volume of sample required for this assay?
There is no specific volume we can recommend for the amount any sample to be used since it is completely sample concentration and quality based. You have to do a pilot expt with multiple sample volumes to determine the optimal volume which gives a reading within the linear range of the standard curve. Please refer to the citations for this product to see what other clients have used with similar sample types.
Do you have trial sizes of this kit?
Unfortunately, we do not have trial sizes of this kit available. However, if you are based in the US or Canada, we will give you a 10% off list price introductory discount on its purchase price. If you are based out of this area please contact yopur regional BioVision distributor.
What is the shelf life of this kit?
The expiry date is typically 1 year from the date of shipment
Can we purchase individual components of this kit?
Yes, you can purchase any of the kit's components without the whole kit. Please refer to the component Cat #s mentioned on the datasheet for ordering.
Can we use an alternate buffer for sample preparation (cell lysis, sample dilutions etc)?
Our assay buffers are optimized for the reactions they are designed for. They not only contain some detergents for efficient lysis of your cells/tissue, but also contain some proprietary components required for the further reactions. Therefore, we highly recommend using the buffers provided in the kit for the best results.
Kang et al., Osteoprotegerin Expressed by Osteoclasts: An Autoregulator of Osteoclastogenesis. Journal of Dental Research, Nov 2014; 93: 1116 - 1123.
Toshitake Hirai et al., Cathepsin K Is Involved in Development of Psoriasis-like Skin Lesions through TLR-Dependent Th17 Activation. J. Immunol., May 2013; 190: 4805 - 4811.
Christian Sina et. al., Extracellular cathepsin K exerts antimicrobial activity and is protective against chronic intestinal inflammation in mice. Gut, Apr 2013; 62: 520 - 530.
Schmidt S, Kindlin-3-mediated signaling from multiple integrin classes is required for osteoclast-mediated bone resorption. J Cell Biol. 2011 Mar 7;192(5):883-97. Epub 2011 Feb 28.
Chang C-J et al (2009) Am. J. Pathol.; 174: 1837 - 1846.
For more citations of this product click here