Over a hundred years ago William B Coley, the “Father of Immunotherapy”, discovered that injection of bacteria or bacterial toxins into tumors could cause those tumors to shrink. The introduction of bacteria had the side-effect of stimulating the immune system to attack the tumor. The field of cancer immunotherapy research—which today includes many different approaches for generating anti-tumor immune responses—originated with these early experiments.
Use of bacteria is one way to stimulate the immune system to attack cancer cells, others include use of cytokines, immune checkpoint blockades and vaccines. This Nature animation provides a simple overview of these methods.
Timing is everything! I learned that the hard way just two weeks ago when I took my son to scout camp and thought I would try to capture the traditional American flag ceremony for posterity. I set up my camera for a panoramic shot and scanned the crowd. Feeling very pleased with myself, I got home that evening ready to show my family the great camera skills I had honed over the Summer months. To my horror, I noticed that half of the scout troop was saluting the flag while the other half were standing to attention! I had got the timing horribly wrong (although the picture is still fun to look at in a strange sort of way).
Timing is everything in science as well. As a technical services scientist at Promega I have sung the ‘timing’ tune to many a biologist. No more so than in the study of apoptosis where Caspases activate each other in a choreographed cascade of molecular triggers that all have their place and time in a domino sequence of enzymatic cleavage events. I frequently talk to researchers about that ‘sweet spot’ of activity when any given Caspase is busily cleaving a peptide moiety off of the next Caspase in the sequence. Finding that sweet spot is anything but trivial and often requires a considerable amount of patience during the optimization phase of experimentation.
Promega has developed a comprehensive suite of systems (see here) designed to help get the timing right for the cell and compound combinations you might be working with. The end result is that you have experiments that are timed so as to give you reliable information about what is really happening in your cells.
Progression of morphology changes during apoptosis.
The concept of cell death as a normal cell fate was articulated only three years after Schleiden and Schwann introduced the Cell Theory when, in 1874, Vogt described natural cell death as an integral part of toad development (as cited in Cotter and Curtin, 2003). Since these early observations, natural cell death has been described “anew” several times. In 1885 Flemming provided the first morphological description of a natural cell death process, which we now label “apoptosis”, a term coined by Kerr and colleagues to describe the unique morphology associated with a cell death that differs from necrosis (as cited in Kerr et al. 1972).
In the 1970s and 1980s, studies revealed that apoptosis not only had specific morphological characteristics but that it was also a tightly regulated process with specific biochemical characteristics. Studies of cell lineage in the nematode, Caenorhabditis elegans, showed that apoptosis was a normal feature of the nematode’s invariant developmental program (Hengartner, 1997). At the biochemical level, Wyllie showed that DNA degradation by a specific endonuclease during apoptosis resulted in a DNA ladder composed of mono- and oligonucleosomal-sized fragments (Wyllie, 1980).
These and many other studies have proven that apoptosis is a critical component of development, and when it doesn’t happen appropriately, it can be pathological, leading to cancers or other diseases. Therefore, understanding how and when apoptosis occurs and the many signals that can trigger this process is a focus of many laboratory experiments.
There are many ways to detect apoptosis in cells or tissues. This blog describes some of the most common ones. Continue reading →
A quick search of the PubMed database for “dual luciferase” quickly returns over 1,000 papers. The Dual-Luciferase® Reporter Assay is a powerful tool that allows researchers to ask a multitude of questions about gene control and expression in a system that itself could be normalized and internally controlled. For more than 15 years, firefly and Renilla luciferases have been valuable tools for researchers asking many different kinds of questions in the life sciences. In a recent webinar, Biologically Relevant Assays for Oncology: Harnessing the Power of Bioluminescence, Neal Cosby discussed how bioluminescent chemistries have formed the basis of a range of powerful assays and research tools for scientists who are asking questions about the deep and complex genetic and cellular story associated with cancer. Here we talk a bit of about bioluminescent chemistries, some of the newest bioluminescent tools available, and how some of these tools can be used to probe the deeper questions of cell biology, including cancer biology. Continue reading →