Name: 我们刚刚发现脂肪细胞可以移动！（We Just Found Out Fat Cells Can Move!）
Uploaded: 2021-05-05T12:06:30.000Z
Duration: 6 min 4 s
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Of all the cells in the human body, fat cells might get the most hate.

Their main function is to store fat molecules.

And while that is a very important job, a lot of people kinda maybe wish they didn't

But it turns out that fat cells, or adipocytes, are doing a lot for your body -- maybe even

Because this week, a trio of British biologists reported for the first time that fat cells

Oh, and also it turns out they help heal wounds.

The study, which was published this week in the journal Developmental Cell, was done on

But the team thinks fat cells might do something similar in humans.

The researchers were interested in how fruit flies repair their wounds, and there were

some hints that fat cells could be involved — like weirdly big shadows that showed up

For these experiments, they used lasers to make small wounds on the underside of fly

pupae — I know this seems kind of mean — that's the stage just before the fly is fully grown.

And to keep track of which cells were fat cells and which were other types, they turned

Then they recorded what happened next under a microscope.

Almost immediately, large fat cells started traveling to the injured area to plug the

hole, usually taking about an hour to get there.

Then they basically turned into, like, a fat version of a band-aid, forming a tight seal

on the wound that would keep bacteria out.

The fat cells also worked with the flies' immune system to remove dead cells and any

And if the researchers infected the wound

on purpose, the fat cells released antimicrobial peptides, or small defense proteins, to fight

Seeing fat cells help heal wounds was weird enough.

But really, the strangest part was the fact that these cells were moving at all.

Researchers had always assumed fat cells kind of just sat there.

But here was a cell swooping in to save the day.

It gets even weirder, because the fat cells weren't moving the way most cells in an

organism do, which is by sticking to other cells and tissues and kind of pulling themselves

Instead, the fat cells seemed to be entirely on their own, changing their shape to propel

themselves through the flies' liquidy insides.

Now, the question is whether we also might have a bunch of Michael Phelps-like fat cells

Obviously, there's a lot going on in flies that's different from humans.

We have much more complicated clotting systems, so it's unlikely fat cells would serve the

And hopefully not too many of us are suffering from laser wounds.

But there's some evidence that fat cells in mice also pump out these antimicrobial

defense proteins, which could bode well for us.

And frankly, no one has looked very hard to see whether any fat cells are moving.

So, it could be just a fly thing, but it might not be.

And maybe you should be thanking your fat cells, instead of wishing they were smaller

In another paper published this week — this one in Nature Communications — a group of

French and Brazilian virologists reported discovering two new giant viruses.

You're not going to spot any crawling around in your basement.

But compared to the rest of the viruses on the planet, these things are huge — they're

Since both of the new viruses were found in Brazil, the researchers named them tupanviruses,

in honor of Tupã, the thunder god of a local indigenous group known as the Guaraní.

One came from the mud of a soda lake — a type of lake that's super salty and has

So as tasty as it sounds, you probably don't want to drink it unless you enjoy bleach with

The other virus was found in deep ocean sediments off the coast of Rio de Janeiro, dug up by

Under a microscope, the viruses look a bit like fuzzy light bulbs with extra long screw

They can grow to more than 2 microns, or millionths of a meter, making them one of the longest

Now, usually, viruses have just a handful of their own genes, because they mooch off

Influenza A, for instance, has just 8 genes, and HIV has 9.

Their entire genomes are made up of less than 15,000 nucleotide building blocks.

But these tupanviruses have genomes that are a hundred times bigger, with about 1.5 million

of those building blocks making up a whopping 1300-1400 genes.

Even more impressive is the content of those genes.

Tupanviruses have more genes dedicated to synthesizing and assembling proteins than

any virus we've ever seen, including roughly 200 other giant viruses.

Which is surprising, because part of what makes viruses dependent on other life forms

is the fact that they rely on their hosts for that very job.

Now, tupanviruses still can't string proteins together on their own because they're missing

The question is, where did this strange set of genes come from?

One possibility is that giant viruses started off as some kind of cell, and then lost some

But it could also be that they started off as smaller viruses, and grew bigger as they

Scientists are hoping to figure out how giant viruses evolved by comparing their genomes

The tupanviruses give us a bunch of new data to add to the pile, but they aren't enough

We'll need to find more giant viruses to figure out what really happened.

About a year ago, we launched a new channel with the help and guidance of our SciShow

Well, this coming Tuesday, SciShow Psych turns one-year-old and we would like to celebrate