Health scientists have understood the role T cells play in the body for more than 60 years.
Cytotoxic T lymphocytes [Sigh-toe-toxic T lymph-oh-sites] are part of the immune system. You can think of them as the body’s most specialized fighters, like the Army’s Delta Force.
Now, Swiss researchers have found a way to see the mechanisms in three dimensions and much better detail.
T cells are key to health. They kill cells infected with viruses and bacteria, and they can flat-out destroy a tumor cell. They also serve as the immune’s system memory, recalling pathogens long after exposure so the body can rapidly fight them off.
Pretty handy, right?
Swiss researchers knew that scientists often face trouble trying to examine T cells because traditional imaging methods can distort delicate cell components. They often had to choose between high resolution, a large field of view or keeping cell structures intact.
The Swiss team chose an advanced method called cryo-expansion microscopy: In short, they froze the samples so fast that no crystals formed. Then they used a hydrogel to expand the samples, making it possible to see cells’ internal structure.
Putting frozen T cells and tumor cells together, they discovered that a membrane quickly forms between the two, creating a dome where the hero cells take action. The team also examined cytotoxic granules — T cells’ ammo, if you will — with better clarity than ever before.
While it may mean little to a layman, for immunologists, understanding what makes immune attacks on cancer successful or not is big. And that could mean everything to future patients.