The Protein Man's Blog | A Discussion of Protein Research

The Role of LDH in Cellular Cytotoxicity

Posted by The Protein Man on Jan 7, 2020 2:30:00 PM

Analyzing the effects of necrosis and apoptosis is a vital component of biological research. Although there are numerous assays to detect apoptosis, there are significantly fewer assays available to measure necrosis. The release of LDH is a beneficial method for detecting necrosis, especially when combined with cellular cytotoxicity.

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Topics: Apoptosis Assays, Cytotoxicity Assays

Detection of Apoptosis by TUNEL Assay

Posted by The Protein Man on Mar 5, 2019 2:30:00 PM

At a cellular level, there is always a homeostasis maintained between cell division and cell death. The process of growth and development involves an active balance of both of these mechanisms. Cell death occurs through three distinct mechanisms depending upon the molecular signal: Apoptosis, Necrosis, and Autophagy. All these processes have specific morphological and biochemical hallmarks that help them to get identified through different techniques.  Also, these processes are crucial in a normal cellular state, while a heightened or reduced rate of these processes lead to diseased conditions. Autophagy involves intracellular protein degradation and is an important aspect of cell starvation, aging, and differentiation. Apoptosis is also known as programmed cell death, where a strict tightly controlled event making apoptotic bodies to promote cell death. Necrosis results into the release of cellular components in the extracellular space after cell destruction. 

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Topics: Apoptosis Assays

A Derivatizing Agent for Glutathione Assays

Posted by The Protein Man on Nov 11, 2016 11:00:00 AM

4-Vinylpyridine as a derivatizing agent for free thiols and its application in Glutathione assay

Glutathione assay involves quantification of reduced Glutathione (GSH) and Oxidized Glutathione (GSSG) in various organisms or in various tissues, blood samples, plasma, serum or cultured cells. Free thiols such as GSH can be detected by their property of relatively high reactivity compared to other biological molecules. On contrary disulfides such as GSSG does not have any unique property that could be exploited for its quantification. Hence Glutathione disulfide (GSSG) quantification can be done after reducing it to its corresponding thiol (GSH). Thus the most widely adopted methodology for quantification of GSH and GSSG is determination of total GSH concentration, followed by alkylation to remove GSH and then reduction of GSSG and its quantification. GSH concentration in sample can be determined by subtracting glutathione disulfide concentration from total glutathione concentration.  

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Topics: Apoptosis Assays

How can the Vmax of an enzyme reaction be calculated from the colorimetric SAM assay?

Posted by The Protein Man on Jan 29, 2014 1:56:00 PM

To calculate the Vmax and Km of the reaction you will need to run various concentrations of the methyltransferase to be tested and calculate the activity at each concentration.

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Topics: Apoptosis Assays, Assay Development (ELISA)

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