在手机上保存，获得更好体验
本字幕由TME AI技术生成
You can have perfect warm m levels flaw less baseline tests be incredibly healthy and uh still sit in the clinic
Just watching your ivf cycles fail
Yeah It's
It's hearbreaking it really is you produce embryo s
But they consistently great out as poor quality
It's a devastating reality for so many couples
And honestly it highlights this massive biological blindpopot
Because we
We can sequence a genome
We can measure hormones down to the picogram
But we still struggle with this one fundamental question
Which is why do some microscopic cells thrive and become you know the foundation of alilife
While others that look perfectly identical on apapapjust falter
And that is really the absolute frontier of reprodutive tive biology
Now i mean we 're dealing with microscopic margins of error here
Yeah
Some mrazer them exactly a slight imbalance at the cellular level doesn't just cause a little hickup
It completely rests the development of life genomes can can tell you what sell is capcapable of doing right and diomics tells you what machinery it is already built
But neither of those tells you what actually roaming ing
That exexacomvesspot on they miss the real time activity
Okay
Let's impact this
我的对的
We are taking a deep dive into a really ground breaking twenty
Twenty six paper from sell death and disease
Our mission today is to uncover the hidden metablic fingerprprabbuosithat
That is egquality and embronic development get a fantontic paper er before we predicting into the selular mechanics
I'm genuinely stuck on the logistics
Here
How are we predicting the viability of a microscopic embryo before it's even fully formed
对对对
Specispeciis
We obviouly ly not you know
Cut it open the look inside
It's fascinating
Here is that we look at the exhaust
We look at the fuel
We look at the metabolism
The metaboolim yeah
Mettablism is the ultimate point
The the biulogical regulation
It is the real time immediate reality of a living cell
So like if you want to know how an engine is running
You don't just read the manufacturing blue preat
Exactly you take a temperature
The fuel consumption
The exhaust
By by enoozthe the metaoc environment surrounding the egg
We get a highly accurate picture of the physical trade
The phunoo pe self without ever disturbing the embryititself and the molecule of the desm of this metabolireality
The one we're going be taltalking about metablily today is a dennassm so keep that name front today
Oh Yeah
A dennesing is the absolute star
The show to understand why a denosy is the key
We had to look at the clinic evidence
Ah the reararchdidn't just start in the metridish right
Ah
Ah started with a distort of thirty six facples undergoing ivf and the data here paints of very little picture
Right let me read some of these deats s they
They are wild
The female partners had a mean age of three three point three years
A super per healy bmi of twenty two point six
Their ovariresererve tests were rock solid based fsh levels were at seven point six
Iu permal
Which is totally normal
Yeah
In their amh
The auommilarian hormone which tells us about exapply was at four point three nograms premal those numbers are critical
Because they rule out the usual suspects
I mean these are not patients in severe preprogradecclright
But the male partners were equally healthy around thirty five point five years old normal sperm density at fifty nine point five million prilizal leader a really soaccount and mllity was nenely ly five perperent ent
When acactually ent through the retritrival process
The clclinies got in average of nine point six uissiz's recycle with a very standard sevenone point two percent fertitizzleader so statistically speaking these thirty six couples are practically perfectly matched across all the clinical factor right
But the outcomes completely direcge the researchers split them based on a rigid threshoright
So the cycle produced less than forty percent high quality great one into mbmbros or did it party forty percent above this is where we have to sort of visualize the mmicroenvironment
The osusict doesn't just exist in a vacuum
No
It's got a whole support system
Exactly it sits at the center of a highly complex network
So directly surrounding the usicide are the cumulus cells
Think of them as the power stations in the supplilines
Our stations
I like that
Yeah
They filter neutrians
They provide energy
And they send critical molecular signals directly to the egg
And then surrounding all of this is the folecular fluid
Which
Which like the the mode around a castle
A moat
Or maybe more like a regional transport highway
It carries hormones and metabablightes too and from the entire structure okay power stations in highways
That works better than the old queen in her castle analogy
Because this is an active dynamic system
是的 对的
So the researchers couldn't touch the u side itself
So they analyze the power stations
Accumulate cells great and to do that they used a technqucalled uh pll c dash rms
Which is quite the mouthle that's all tra high performance liquid chrometography coucouple with high high searchmass patrametry
Basically a massive machine
That weiways and identifies every single microscopic molecule in a sample
And they found one hundred and forty eight different metablights in there
But only fifteen of them were significantly different between the high quality and poor quality embrro group
And here is the kicker out of those fifteen fourteen were ababnormally high and the poor quality group with higher not lower
Higher
They were just accumulating in the mumula cells
When the researchers ra pathway in rrichment analysis
Which is just a way to see what biological system
These molecules actually belong to they found a massive disruption in purin metabolism and the primary culprate in that pathway was a deneassum
Yes in the cycles that produced poor embraos a dnasseine was sevely ly inside the cumulus cells
The predict of value of this measured by a start called the rocauc was zero point seven four
Six Five
Which in the world of biomarkers
That's a pretty robust reliable signal
Right like a solid begrade for predicting outcomes
Exactly it's a localized metablic traffic jam
The eenoine is just stuck in the power station
The ethey cheked the regional empty that fliccular fluid they found it was practically empty the fluid surrounding the poor quality eggs was drastically depleted of denocine
The field just isn't circulating
It is being horted inside the support cells leaving the surrounding environment starved it the the entire metablic network compromise
Let's synthesizes for a second just a recap before move on
And the enpothe cllitical staff like age deneethe pothe the whole story
Which there's hidden metaboloc layer
Number two cumulular cell comisides and fucular fluid form this tde dependent microenvironment and number three poor embrequality features this massive denenosy imbalance too much trapped in inside the cells
Not enough in the fluid
Which raises this immedia biological question
How does a cell actually become starved of its own fuel in the middle of a nutrient rich environment
Right
And acactually want ththrow a question to you of the listener
Right now think about your own daily energy levels
Think about fuel gets trapped inside one room of your house
And can't circulate what happens to the rest of the lesteright
And stands out to about about the secular traffic jam
It's like having fufull fridge
But the kitchen doors lock exactly
And that is a perfect transition in how we grade the evidence here
Clinical observation in humans is great
It gives us correlation
But to prove causing
To prove this trappto denenosine is actually causing the poor embryo quality
We have to move to animal models
We have to manipulate the variables
So the researchers didn't just use one model
They use two independent models to simulate declining uside quality right seven weeweek led female mice
So the icc r ice yeah one group is subjected the whole body extrary erratificilibrifive five one or two grades
And the other group was injected intrepreneurnearly with cyclla
Fohopl
Mde or ctx
Which is a chemo therby drug at seventy five one hundred or one hundred and fifty millograms per kilogram
Now why is both radiation and chemo because they endo cellular stress and diminitial vvariic capacity through abtirely different biological mechanism policy
Yeah radiation causes direct physical damage to selular dna
While ctx chemically disrupt cell division and induces toxicity
So if both of these vastly different stressers result in ah exact same ienoicy index
It proves that this metaoobottlneck isn't just a quk of radiation right exactly it proves it's a universal fundamental biological response to declining are very inhealth
And it absolutely was after one week
Both the erradiated mice and the ctx injected mize show a pleverely decrease of variant size and a lummeted flecular index
And when they ran that targeted metaboomomc analyis again the mice show the exact same traffic jam as the human women a enenoine horded in the cumulus so totally missing from the fuliccular fluid
But you know
Knowing it happens isn't enough
I want to know the why
Why is the adenosine tting trapped hate who belt the road block
Yes
Define the road block
They analyze the cells physical infrastructure using quantitative rtpcr or qrtpcr
Right this take the ee basically acts like a molecular tlecounter
It counts the exact number of messenger rna molecules being produced telling us precisely
Which genes are turned on
And which are shut down
And they discovered a catastrophic collapse in the expression of specific transport genes
The locked doors in broken bridge ges analogy precisely let's start with the doors
The researchers found a massive decrease in ent one and ent two
Which stands for equliberative nuclear side transporters
Right
Good good
Ure to remember this as ent equals entrance or exit really these are the physical doors embedded in the cell membranin
That allow ienosy to flow out of the cell and into the fllicular fluid highway
So the low quality us sites the expression of ent one and ent two was severely down
Regulated the doors were quite literally locked and bolted too
But they also found a breakdown internally
It wasn't just the doors to the outside highway
Right
They looted the the interal al intercomm system too yeah
They found a sharp decrease in a gene called cx thirty seven
Which builds a protein called connects in thirty seven
Remember cx equals connection
Yes
Cx thirty seven formed is what we all gap jjuntions
If ent proteins are the doors to the outside world
Gap junctions are the internal microscopic bridges directly connecting the cumulus cell power stations to the us side queen
They allow molecules to pass back in fourth instananeously
But when cx thirty seven shuts down
Those bridges collapse
Here's where it
It's really interesting
If we go back back a power station
Ananwogy the ent doors opening to the highway are lock shut meaning no fuel gets to the broader region
对的对的
And the cx city seven seven unnels ls connecting power wer stations directly to the central queen are collapsed
The cells completely isolated the cumulus cells just drown in a massive accumulation of unused denenosine
While the u site and the fliccular fluid outside just stff in a biology isolation equal stress
When a new site loses its communicication chanls ls in its sector cellular signalling molecules
Its internal railtorory networks began to just unravel
It is entirely world off so rekeup time for subtopic too um one mouse models using x ray and ctx confirm the human findings of diminished to very aricappic two two identity accumulation is caused by the downregulation of e nt one and ent two transporters
A doors right and three gap junction communication breaks down
Due to reduce cx thirty seven
The broken inner com
It's a devastating structural cascade so listener
Think about this
If the doors are logged
And the intercom is broken
How does a cell signal for help have you were experience a break down in communication
That just cascadted into a bigger catastrophic failure
Like when one server goes down in the whole company networcrashes exactly
And that is what's destroying these early embryo s
Which brings us to the intervention phase of the study
The researchers asked a beautifully elegant question
If the doors are locked from the inside
What happens
If we just by pass the infrastructure entirely and deliver the fuel from the outside
The rescue mission right
They took these aged low quality streressed ooticiand and place them an inviral al llturmedium
But they altered the medium by simply adding exogerous of enosy manually replacing what the fluid was missing
And they only countered them for twelve hours
Which is while in an ererhours of expopoto exexternal identiine and the results were stunning you was nothing short of a total cellular reboot
They had tes of errils reaching the two cell for sell and blessed st stages just skyrocket ity completely restore the developmental potential
Furthermore the quality ality
These blescists improved dramatically
They had way higher total cell counmaand a twvere reduction in aypototic or dying nucleeye okay
Wait
I really have to push back here
Because biologies rarely this simple
You are telling me that these cells had radiation damage kem of therapy toxiccity locked transport doors and collapsed internal tunnels yet
And just floating them in a bath of a single molecular denosy for half a day
Fixed that catastrorophic structural damage
How does cell even know what to do with it
If the doors are long walk me through the algorithm
It's a fantastic question
The key is that the cell doesn't need the doors be open to receive a signal from the outside
So because the receptors exactly the researchers used a technique called smart seat to transcripomics to read the cells real time genetic construction manual during this rescue
And they found that when you add exoginous to dendency into the fluid
It buds to ienocy receptors as which sit on the outside surface of the cell membrane
So think of these ar receptors like satellite dishes on the roof perfect ananogy gy a ienocy docinto the dish
It triggers a massive complex interescellular cascade
It physically rewires the cells behavior from the outside in
And the data showed two distinct pathways firing up to save the cell
Let's break down them
Like you are algorithm pathway one is all about my osis and spindles right
So when the identity receptor is activit it triggeers a second messenger inside the cell called cyclc amp or cmp
That's the runner yes
The cmp acts as a punner carrying the signal deep into the cell to activating the enm called pcl yes cm ppka pathway is the master regulator for cell division
Because eamryous very first job is to divide safely one cell becomes two
Two become for exactly
And to divide safely the cell has to perfectly align its crimmoes and pull them apart using a physical scaffle ling called the maytics spinble
Ok
So how does pka control the scaffle right camp pka pathway directly regulate tes two massive protein complexes
The first is mpf specifically aptein called psypb one
Which drives the division forward the gas pdtle right
And the second is apcc syopyically cdcb seven
Which access the checkpoint to ensure everything is the line broad
Yes by activating this pathto the exoge as denenooine acts like a master conductor fine tuning the gas conductor
So that the chromoomes don't tangle preventing meotic errors
Wow
So pathway one is essentially rebuilding the mysible scaffolling of the cell
So it doesn't terrorzone dna apart
When it divides that is incredible
But what about pathway too
Pathway too
Deals with the chemical fire of oxydtic strestress
The rust exactly when the cells were originally starved of extracellular adenosine
It triggered a massive panic response
The cell are regulated a gene called mapgate
Which produces a highly inflamatory protein pathway on is jane
Caand and leleels of jn k basically mean this cells engine is red lining producing toxic exhaust
We call that exhaust reactive oxygen species or rosros are these highly unstable molecules
That steal electrtions from other ocellular structures
They literally rust the internal machinery of the cell in the researchers proved this using flaous sustaininright yeah
They used cmh two
Dcfda and dhh fluosent stainining these dies physically glow bright red or green in the presence of ros and the low quality stress eggs were glowing incredibly brightly under microscope
But when they introduce the exoggenous idenoy to the satellite dishes on the cell
Memembering the internal algorithm shifted the ienocy signalling actively suppresss the mathic fage and shut down jjank pathway
The floresand gloing faded the ros levels palfmated it extinguished the fire
So let's recap some topic three one exlaugenous to dendency and selementation recuses early embronic development huge finding two
It fixes maotic defex via that ar to camp y and pk pathway
The regulating the sysybeone in cdc
The jancacathway the gas in the brakes and three adtitiates
Ocetitic of stress by suppressing the jane k pathway slashing
The levels of toxic ros
It is a profound demonstration of how a targeted metabolic intervention can just override deep structural cellular stress
It really is so listening think about this
We often think of stress as a mental burden right a tough we could work
But here we see oxiditive stress literally breaking cellular spenals apart
How might optimizing our own cellular metabolism protect us from systemic stress
It really forces you to view your health at a completely molecular level
It definitely does so what does this all mean we started with couple sitting in fertility clinics desperate for answers as to why perfectly good baseline stats lead to failing embrro s if we connect this to the bigger picture
The clinical implication here are going to totally shift the paradigm of ivf
Because it's not just a new attitude for the peridishrwell well obviously ly poised for a highgheffeffetive atdititive for indiviital al maturation mediums clinics could potentially rescue struggling suicides simply by optimizadienosin the culture fluid
But the bigger breakthrough is diagnostic the biomark aspect
Yes
This study established is dentitized dieelibrium as a highly predictable mathematically measurable memediolic fingerprit
It removes all the guess work
I mean historically embrologists have had to rely on subjective visual graeing
They just look at an erryoo under a microcope pe make a jujugement call right
They say oh
This looks like a great eye
This loooptibly fragmented
But visual greeting tells you the damages already happen too late
Exactly this research turns that subjective art into an objective precise metaboliscience ence ananalzing the fluid from the cumulus cells
During retrieval cliniciations can measure the exact inter versus
Extrcellular enenoing ratio
They can read the metaboc diagnostics and predict the viability of embrro before the visual defects
Every even manifest it's the difference between waiting for your cars engine to sease up and smoke versus pluging a computer into the dashboard
And seeing that the fuel pup is about to fail and intervievening before the failure happen exact as we wrap up
I want to leave you with one final lingering concept to really ponder
嗯
Throughout this entire deep dive
We've talk about a dennsseine as the crucial fuel for an embryo
But a dennesine isn't just an obobscure reproductive chemical
No not at all
It is the a in atpa denenosy traphos pate
It is the absolute universal energy currency of all living things
It cannot move a single muscle or fire a single neuron
Without it
It's a backbone one of life
If a mmicrococohic in vidence of a adenoenine
Just a tiny traffiking error across a few locck cellular lar doors condictate the very dawn of human life in a embrro
So if a might it play in a broader ageing of our adult bodies
Wow
If broken bridges and lock transport genes cause this much traotic c stress in a single cell imagine cumulative effect across trillions of cells in a sixty or eight year old biological system
Right could the onset of age related diseases just be a microscohic version of this exacted adenostrastel as we could older ourselves to slowly locking their ent transport doors in shutting down their cx three seven communication towls could mastering a adenosine transport be a key to anti aging itself exactly it makes you wonder
Thank you so much for joining us on this deep dive
Keep questioning the microscohic mechanisms that make life possible
And keep looking for those hidden memetaolic fingerenprts
Ccatch next time
