Tweet = tell the signs?

It refers to a post on Twitter.

I'm afraid it is NOT so.

Thanks for replying.
But I'm afraid it is NOT so.

Yes, it does, even if there is no link. Tweets -- when not used in the context of bird calls -- refer to posts on Twitter.

The context in the starting post is misleading.

It should go like this:

Mitochondria Tweet about Aging

(PAGE 79 Linking mitochondria to aging has focused on reactive ...)

That is, "Mitochondria Tweet about Aging" is the title of a medical article.

are you able to link the artical oristar?

It would be my assumption from the information provided that the title refers to a short dissertaion (a "tweet") about mitocondrial bacteria and aging even if it doesnt appear on twitter
It may be the authors attempt at making his paper interesting to a younger generation of reader or to link it to modern society.
It could also refer to some method mitocondrial bacteria has of "communicating"

I have heard of mitocondrial bcteria before but was unsure where or what context.
while researching i came across this sentence on wikpedia.

"In addition to supplying cellular energy, mitochondria are involved in a range of other processes, such as SIGNALLING...."

I therefore respectfully suggest that my guess about bacteria communicating is correct.
The artical probably goes on to suggest that the bacteria signalls in short bursts of chemical communication, like a tweet on the social network. Twitter

Here's the screenshot (because no link can be offered):

My apologies, I got it wrong.

No need to apologize. Because you're well-intentioned.

Why, thank you. That's very gracious of you.

From my limited understanding of the screenshot you posted my guess appears to be correct.
The editor (probably not the author) has likened the secret chemical signal (mitokine) to a tweet on social network site Twitter being recieved and responded to by other mitochindrial.
Refering to "tweet" was probably done to draw attention to the artical.

Are you misspelling "article" deliberately?

no it's one of thse "habits". I learned to spell it wrongly in the first place and it will take some work to break the habit.
I do same with sentence/sentance