Ahmed Eltanahy
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eltanahy.bsky.social
Ahmed Eltanahy
@eltanahy.bsky.social
#Neuroscience #choroid #vascular
Pinned
Happy to share my paper at PNAS!
#Choriocapillaris is intrinsically sensitive to light, endowed with #Opsins, a mechanism that we show is necessary for ocular physiology and the mysterious #choroid. t.co/TcxDuuS30O
Reposted by Ahmed Eltanahy
#Throwback 🧪

REVIEW | Exploring pancreatic beta-cell subgroups and their connectivity

G Rutter, @bennyscience.bsky.social et al
Exploring pancreatic beta-cell subgroups and their connectivity - Nature Metabolism
Rutter and Benninger discuss the role of putative controlling beta-cell populations in the context of intra-islet connectivity, how such a cellular hierarchy might be achieved and its potential role in islet physiology and diabetes.
bit.ly
November 19, 2025 at 7:01 PM
Reposted by Ahmed Eltanahy
When a larval zebrafish twitches its tail, the vascular endothelium lights up with a calcium signal, mediated by Piezo1. We used to think mechanosensing in endothelial cells was about sensing blood flow, but at least in this case it's about sensing body motion.
November 14, 2025 at 8:34 PM
Reposted by Ahmed Eltanahy
This is 🤯

All publicly available. Looks like an amazing new histology-based human probabilistic atlas and parcellation tool.

#neuroskyence #mri #brainmapping

A probabilistic histological atlas of the human brain for MRI segmentation | Nature share.google/5AD0iW7pxgb4...
A probabilistic histological atlas of the human brain for MRI segmentation - Nature
NextBrain is an open source, probabilistic atlas of the entire human brain, assembled using artificial-intelligence-enabled registration and segmentation methods to reconstruct the multimodal serial h...
share.google
November 6, 2025 at 5:35 AM
Reposted by Ahmed Eltanahy
extraordinarily deep investigation of the human fetal heart with spatial and single cell approaches. With a comment by postdoc Lisa Iwamoto-Stohl and I. www.nature.com/articles/s41...
www.nature.com/articles/s41...
Spatiotemporal gene expression and cellular dynamics of the developing human heart - Nature Genetics
The authors use spatial and single-cell transcriptomics to examine spatial dynamics during early human cardiogenesis, yielding insights into the development of the cardiac pacemaker-conduction system,...
www.nature.com
October 29, 2025 at 2:07 PM
Reposted by Ahmed Eltanahy
How is the persistence of compartmentalized inflammation sustained in MS?
Our new study in
@cp-immunity.bsky.social
offers some hints.

cell.com/immunity/ful...

Thanks and congratulations to all contributors
October 29, 2025 at 3:01 PM
Reposted by Ahmed Eltanahy
Reposted by Ahmed Eltanahy
A noninvasive, CSF-specific MRI technique that enables detailed in vivo measurement of CSF mobility in humans, down to the level of perivascular spaces located around penetrating vessels

www.nature.com/articles/s41...
Region-specific drivers of CSF mobility measured with MRI in humans - Nature Neuroscience
Brain clearance mechanisms are challenging to visualize in humans. Using magnetic resonance imaging, the authors noninvasively mapped cerebrospinal fluid motion across the brain, showing region-specif...
www.nature.com
October 24, 2025 at 4:02 PM
Reposted by Ahmed Eltanahy
#Throwback 🧪

COMMENT | A brief guide to statistical analysis of grouped data in preclinical research

@colbyvorland.bsky.social
L Golzarri-Arroyo
DB Allison
A brief guide to statistical analysis of grouped data in preclinical research - Nature Metabolism
Clustering and nesting (C&N) arise in many preclinical studies, such as when animals are group-housed or share litters, or in cell culture. Ignoring C&N undermines the validity of analyses. Here, we explain how C&N arise, as well as valid designs and analyses.
bit.ly
October 23, 2025 at 2:32 PM
Reposted by Ahmed Eltanahy
"Here we show that heartbeat sound promotes structural and functional maturation of human cortical organoids with a physiological astrocyte-to-neuron ratio." 🤯 www.biorxiv.org/content/10.1...
Astrocytic PIEZO activation by heartbeat sound promotes extracellular matrix and maturation in human brain organoids
Heartbeat sound is one of the first rhythmic stimuli encountered by the developing human brain, yet its biological role has remained unexplored. Here we show that heartbeat sound promotes structural a...
www.biorxiv.org
October 22, 2025 at 4:44 PM
Reposted by Ahmed Eltanahy
#Throwback 🧪

COMMENT | Metabolites are not genes — avoiding the misuse of pathway analysis in metabolomics

KS Lee, X Su & T Huan
Metabolites are not genes — avoiding the misuse of pathway analysis in metabolomics - Nature Metabolism
Pathway analysis, originally developed for gene expression data, has been adapted for metabolomics. However, owing to the unique characteristics and constraints of metabolites compared with genes, pathway analysis in metabolomics often yields misleading or nonsensical results.
bit.ly
October 19, 2025 at 7:01 PM
Reposted by Ahmed Eltanahy
It’s not the thought that counts: Allostasis at the core of brain function: Neuron www.cell.com/neuron/fullt...

This looks super cool; by @jtheriault.bsky.social
By the way congrats really!
It’s not the thought that counts: Allostasis at the core of brain function
The authors review evidence that the primary function of the brain, supported by distributed neural systems, is the predictive regulation of physiology (i.e., allostasis). An example from Alzheimer’s ...
www.cell.com
October 19, 2025 at 3:59 PM
Reposted by Ahmed Eltanahy
'This multicellular system with induced pluripotent stem cell-derived neurons, microglia, oligodendroglia, astrocytes, pericytes, and brain microvascular endothelial cells has potential for opening possibilities for disease modeling, drug discovery and development'
#Immunology #Neuroimmunology
Engineered 3D immuno-glial-neurovascular human miBrain model | PNAS
Patient-specific, human-based cellular models integrating a biomimetic blood–brain barrier, immune, and myelinated neuron components are critically...
www.pnas.org
October 18, 2025 at 5:04 PM
Reposted by Ahmed Eltanahy
🧠 A new era for brain #organoids! Researchers have created Multi-Region Brain Organoids that model human brain development more accurately by integrating cerebral, mid-hindbrain & endothelial regions.

advanced.onlinelibrary.wiley.com/doi/10.1002/...

#neuroskyence #devbio 🧪
Multi‐Region Brain Organoids Integrating Cerebral, Mid‐Hindbrain, and Endothelial Systems
Multi-Region Brain Organoids combine cerebral, mid/hindbrain, and endothelial components into an advanced 3D model capturing 80% of fetal brain cellular diversity. This platform reveals essential end....
advanced.onlinelibrary.wiley.com
July 17, 2025 at 12:13 PM
Reposted by Ahmed Eltanahy
Uridine: Trends in Endocrinology & Metabolism www.cell.com/trends/endoc...

a great not-to-miss piece from the @lyssiotislab.bsky.social
Uridine
Uridine is a pyrimidine nucleoside composed of an uracil base and a ribose sugar. In cells, uridine is predominantly present in RNA (as uridine monophosphate, UMP). Uridine can be produced through de ...
www.cell.com
June 15, 2025 at 6:43 AM
Reposted by Ahmed Eltanahy
Excited to share our new paper out in @cp-neuron.bsky.social today! We discovered the neuroanatomical route that myeloid cells use to enter the brain parenchyma. Check it out here: authors.elsevier.com/c/1lCYs3BtfH...
June 3, 2025 at 4:00 PM
Reposted by Ahmed Eltanahy
Identification of the velum interpositum as a meningeal-CNS route for myeloid cell trafficking into the brain: @cp-neuron.bsky.social www.cell.com/neuron/fullt...
June 3, 2025 at 2:49 PM
Reposted by Ahmed Eltanahy
Reposted by Ahmed Eltanahy
Eltanahy et al. (University of Nevada) used Mightex’s #PolygonDMD Illuminator to reveal how violet light (405 nm) regulates ocular fluid balance via calcium signaling and choroid pressure dynamics. Precision light control in action!
👉 Read more here: www.mightexbio.com/light-sensit...
January 13, 2025 at 5:22 PM
Reposted by Ahmed Eltanahy
The subfornical organ is a nucleus for gut-derived T cells that regulate behaviour

www.nature.com/articles/s41...
The subfornical organ is a nucleus for gut-derived T cells that regulate behaviour - Nature
A distinct population of CD4 T cells resides in specific regions of the steady-state brain, and these T cells are programmed in the periphery by the microbiome to coordinate adaptive behaviour.
www.nature.com
May 28, 2025 at 5:12 PM
Reposted by Ahmed Eltanahy
Led by @scienceyael.bsky.social & out today in @natneuro.nature.com: the brain's fluid-secreting organ — the choroid plexus — can reshape neural development through a powerful, little-known process. & it can be hijacked by serotonergic drugs like LSD. 🧠👇 A thread
rdcu.be/eoaSY
Choroid plexus apocrine secretion shapes CSF proteome during mouse brain development
Nature Neuroscience - The choroid plexus (ChP) provides molecular cues for brain development. However, the underlying mechanisms are unclear. This study identifies an apocrine secretion mechanism...
rdcu.be
May 28, 2025 at 12:56 PM
Reposted by Ahmed Eltanahy
1/ Why do patients with late-stage cancer lose motivation & sink into apathy?
🔥 Our new Science paper shows chronic inflammation activates a cytokine-sensing brain circuit that lowers motivation. Huge team effort: Aelita Zhu, Sarah Starosta, Pignatelli & Janowitz labs! 🧵
🔗 doi.org/10.1126/scie...
A neuroimmune circuit mediates cancer cachexia-associated apathy
Cachexia, a severe wasting syndrome associated with inflammatory conditions, often leads to multiorgan failure and death. Patients with cachexia experience extreme fatigue, apathy, and clinical depres...
doi.org
April 11, 2025 at 2:00 PM
Reposted by Ahmed Eltanahy
Interesting finding that neural stem cells exist outside the brain/spinal cord-in tissues like lung & tail-and share key properties with brain NSCs, challenging current dogma.

Wonder if these NSCs exist in humans & can show similar therapeutic potential

www.nature.com/articles/s41...
Multipotent neural stem cells originating from neuroepithelium exist outside the mouse central nervous system - Nature Cell Biology
Han et al. report the existence of neural stem cells (NSCs) outside the central nervous system and show that these peripheral NSCs display features similar to brain NSCs, including the ability to diff...
www.nature.com
April 11, 2025 at 4:47 PM