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Category: biotech/medical

The oscillatory biology of sleep: Linkage to dementia

During wakefulness, neuromodulators operate largely independently to support behavior and cognition. By contrast, sleep reorganizes their activity into a coordinated brain rhythm. During sleep, the major neuromodulators—norepinephrine, acetylcholine, serotonin, and dopamine—exhibit synchronized fluctuations with a periodicity of ~50 seconds. These oscillations appear as recurrent bursts of fast (10 to 30 hertz) electroencephalography activity and are phase-coupled to cerebrospinal fluid flow. Neuromodulators are vasoactive agents and drive slow vasomotion, which provide the mechanical force that supports glymphatic clearance of metabolic waste. Disruption of neuromodulator signaling, as seen in psychiatric disorders, cardiovascular disease, aging, or with commonly prescribed drugs, impairs clearance of neurotoxic proteins, including amyloid-β and tau.

China’s lab-grown heart organoid could offer alternative to pacemakers

A team of scientists in Shanghai has developed a lab-grown biological pacemaker designed to mimic the heart’s natural rhythm control system. By working with human pluripotent stem cells, which can transform into many different types of tissue, the researchers created a three-dimensional sinoatrial node organoid capable of generating electrical impulses, the South China Morning Post reported.

To make the system more lifelike, the team linked the organoid to an artificial cardiac plexus, a network of nerves located near the base of the heart that helps regulate heartbeat activity. The achievement allowed researchers to recreate how the nervous system communicates with the heart, opening potential new paths for studying irregular heart rhythms and developing future treatments that could reduce reliance on electronic pacemakers.

The research, published in the journal Cell Stem Cell involved scientists from the Chinese Academy of Sciences and Fudan University. The team focused on the sinoatrial node, the tiny part of the heart responsible for controlling its rhythm. Although it plays a critical role in keeping the heart beating properly, the structure has been difficult for scientists to study because of its small size and hard-to-reach location inside the heart.

Optimize Brain Health And Longevity: Tommy Wood, MD, PhD

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Scientists create artificial egg to revive extinct giant bird

The South Island giant moa, a flightless bird that stood up to 12ft tall, last roamed New Zealand’s forests some 600 years ago. Yet the species may have taken a small, strange step back from extinction — thanks to an artificial egg made of silicone.

Colossal Biosciences, a Texan biotechnology firm, has developed a shell-less system it says is capable of supporting a bird embryo from early development through to the point of hatching.

So far the device has been used to produce baby chickens. The end goal, the company says, is to deploy a much larger version to resurrect the moa, whose eggs were about 80 times the volume of a farmyard hen’s.

Mitochondrial checkpoint enables dendritic cells to activate T lymphocytes against viruses, tumors

A study led by researchers at the Centro Nacional de Investigaciones Cardiovasculares (CNIC) has identified a mitochondrial “checkpoint” that enables dendritic cells to efficiently activate T lymphocytes against viruses and tumors. Dendritic cells are immune cells that detect threats and activate the body’s defenses, acting as “sentinels” that instruct T lymphocytes on what to attack.

The study, published in Science Immunology, shows that restoring the internal chemical imbalance caused by defective mitochondrial function in dendritic cells restores the capacity of immune cells to defend the body against infection. The findings could open new avenues for improving cancer immunotherapy.

The study reveals that the ability of dendritic cells to activate T lymphocytes depends on an unexpected mechanism: the proper functioning of mitochondrial complex I, a key mitochondrial component. Mitochondrial complex I acts as a “metabolic switch” that is essential for the ability of dendritic cells to convert viral or tumor-derived material into effective immune activation signals and trigger a strong T-cell response.

Renal Oncocytic Neoplasms: Review of Classification Updates, Imaging, and Management

Renal oncocytic neoplasms present diagnostic challenges, both at imaging and pathologic evaluation. The World Health Organization classification of renal neoplasms defines a spectrum of oncocytic neoplasms, including emerging entities that help define previously uncharacterized or mischaracterized tumors. Low-grade oncocytic tumors and eosinophilic vacuolated tumors are distinguishable from other oncocytic neoplasms at pathologic evaluation and typically demonstrate indolent behavior. Nomenclature regarding hybrid neoplasms has been clarified in reference to hereditary cases associated with Birt-Hogg-Dubé syndrome. Preoperative diagnostic difficulties at imaging contribute to high rates of resected benign renal tumors, the majority being renal oncocytomas. The imaging appearances of oncocytic neoplasms are similar, and the inability to confidently diagnose them at imaging has led to increased resection rates. Preoperative renal mass biopsy may be preventative, but its utilization remains low, diagnoses can be equivocal, and establishing tumor aggressiveness may not always be reliable. Malignant renal oncocytic tumors, including chromophobe renal cell carcinoma, are generally considered the less aggressive subtypes of renal cell carcinoma. However, distinguishing them from the more aggressive clear cell subtype remains challenging, despite imaging frameworks designed to aid categorization. Active surveillance is a safe management option among biopsy-confirmed renal oncocytic neoplasms, but it remains uncertain which patients are suitable for this approach. Diagnostic imaging may assist in risk-stratifying oncocytic neoplasms, with mass enhancement, heterogeneity, and calcification potentially differentiating benign from malignant oncocytic neoplasms. Mass attenuation and heterogeneity may differentiate low-grade and high-grade cancers. Molecular imaging and other emerging techniques, such as MR fingerprinting, may play a role in the future.

©RSNA, 2026

Supplemental material is available for this article.

Surprising cellular dynamics of the aging brain

Scheidemantel et al. address the complexity of Alzheimer’s disease by integrating comprehensive multi-omics data from over 1,300 aged individuals, revealing coordinated molecular mechanisms across brain systems. The findings provide crucial insights into age-related traits and disease pathways, paving the way for potential therapeutic strategies.

Capsida’s Trailblazing Moment: What the Field Owes the Next BBB Program

An insightful perspective on what biological factors may have been the cause of a patient’s death after receiving a blood-brain-barrier crossing AAV treatment. It’s crucial for the field to think about this carefully as we move forward.

TheBioMLClinic

Brief disclosure: I am a named inventor on patents and author on publications related to AAV capsid engineering and CNS gene delivery, developed during my time at the Broad Institute. I now operate independently. This post does not represent any prior employer, current advisory client, or collaborator. The mechanistic analysis presented here is my own scientific interpretation of publicly available data. Full disclosures at the bottom.

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