Lifeboat Foundation: Safeguarding Humanity
Toggle light / dark theme

Blog – Page 2

Get the latest international news and world events from around the world.

Log in for authorized contributors

A Residual N-Terminal Peptide Enhances Signaling of Depalmitoylated Hedgehog to the Patched Receptor

During their biosynthesis, Sonic hedgehog (Shh) morphogens are covalently modified by cholesterol at the C-terminus and palmitate at the N-terminus. Although both lipids initially anchor Shh to the plasma membrane of producing cells, it later translocates to the extracellular compartment to direct developmental fates in cells expressing the Patched (Ptch) receptor. Possible release mechanisms for dually lipidated Hh/Shh into the extracellular compartment are currently under intense debate. In this paper, we describe the serum-dependent conversion of the dually lipidated cellular precursor into a soluble cholesteroylated variant (ShhC) during its release. Although ShhC is formed in a Dispatched- and Scube2-dependent manner, suggesting the physiological relevance of the protein, the depalmitoylation of ShhC during release is inconsistent with the previously postulated function of N-palmitate in Ptch receptor binding and signaling. Therefore, we analyzed the potency of ShhC to induce Ptch-controlled target cell transcription and differentiation in Hh-sensitive reporter cells and in the Drosophila eye. In both experimental systems, we found that ShhC was highly bioactive despite the absence of the N-palmitate. We also found that the artificial removal of N-terminal peptides longer than eight amino acids inactivated the depalmitoylated soluble proteins in vitro and in the developing Drosophila eye. These results demonstrate that N-depalmitoylated ShhC requires an N-peptide of a defined minimum length for its signaling function to Ptch.

Reversing Humanity’s #1 Killer

Heart disease still kills nearly 20 MILLION people every year worldwide — roughly 1 person every 1.5 seconds. — But what if medicine could move beyond simply slowing plaque buildup…and actually REMOVE toxic oxidized cholesterol from arteries? — Dr. Matthew “Oki” O’Connor, CEO and Co-Founder, Cyclarity Therapeutics.

In the time it will take you watch this episode, over 2,000 people around the world will die from diseases driven by arterial plaque. But what if we could actually remove the toxic cholesterol already trapped inside arteries?

Today we’re diving into one of the biggest unsolved problems in medicine and aging: how do you actually remove arterial plaque instead of merely slowing its progression?

Cardiovascular disease remains the world’s leading killer, despite decades of statins, anti-inflammatory drugs, and newer RNA-based therapies. Most existing treatments help manage cholesterol and reduce risk, but very few directly target the toxic debris already embedded inside plaques.

But what if we could literally extract some of the most dangerous oxidized cholesterol molecules from the body?

Continue reading “Reversing Humanity’s #1 Killer” | >

This tiny outer Solar System world has an atmosphere. It shouldn’t

Astronomers have spotted something surprising in the far outer Solar System—a faint, short-lived atmosphere clinging to a tiny icy world that shouldn’t be able to hold one at all. The object, called 2002XV93, is far smaller than Pluto, yet observations during a rare stellar alignment revealed its presence through a subtle dimming of starlight. Even more puzzling, calculations suggest this atmosphere should vanish within about 1,000 years unless it’s constantly being replenished.

A group of professional and amateur astronomers in Japan has uncovered evidence that a small, distant object in the outer Solar System is surrounded by a thin atmosphere. The finding is surprising because the object is far too small to hold onto gas for long, raising new questions about how and when this atmosphere formed. Future observations will be needed to better understand its composition and origin.

Far beyond Neptune’s orbit, thousands of icy bodies known as trans-Neptunian objects (TNOs) circle the Sun. Pluto is the most well-known example and is one of the few with a confirmed thin atmosphere. For most TNOs, however, the combination of extremely low temperatures and weak gravity makes it unlikely for them to retain any gases. As a result, scientists generally expect these distant objects to be airless.

Developmental emergence of sparse and structured synaptic connectivity in the hippocampal CA3 memory circuit

Using multicellular patch-clamp recording, the authors show that the hippocampal CA3 autoassociative network undergoes pruning of CA3–CA3 synapses and downregulation of synaptic efficacy during postnatal development, suggesting a double transformation of coding properties and memory functions.

New kind of dark tourism emerging in online ‘Backrooms,’ study shows

Digital culture is reshaping people’s experiences of fear, curiosity and belonging, according to new findings from Lancaster University. Researchers have explored why online environments like the “Backrooms”—mysterious empty spaces resembling uncharted office blocks, basements and corridors—have become so compelling, and why people are choosing to get lost in spaces that don’t exist.

Unlike traditional “dark tourism,” which focuses on physical sites and historical events, the “Backrooms” represent a new kind of experience that exists entirely online. They emerge from, and circulate through, the darker corners of the internet that are less visible, less regulated, and often more experimental in tone.

The research, co-authored by Dr. Sophie James and Professor James Cronin from Lancaster University Management School (LUMS), explains how, in these online spaces, people are not traveling to real locations, but entering shared digital environments that feel immersive, unsettling, and just out of reach.

Multiplexed MRI provides a comprehensive view of the human brain

New multiplexed imaging technology using standard clinical MRI systems can simultaneously map more than 20 biomarkers in high resolution, providing a comprehensive view of the brain with a single scan.

Researchers demonstrated the multiplexed MRI technology, or MRx, by characterizing brain tumors and multiple sclerosis lesions — revealing different structural, physiological and molecular changes within the diseases. The team reported its findings in the journal Nature.

“MRx can be a powerful tool for noninvasive tissue characterization, helping to advance personalized, precision and predictive medicine,” the author said. “By providing rich, multidimensional biomarkers to capture disease progression and treatment response, this capability could open new opportunities for more precise diagnosis, individualized treatment planning and improved patient outcomes.”

Recurrent Limitations of CAR-T Therapy in Gliomas: Evidence from Preclinical and Phase I Clinical Studies

In recent years, the development of new immunotherapy strategies has been a significant breakthrough in cancer treatment. Among these, engineered T cell therapy with chimeric antigen receptors (CAR-T) has produced notable clinical results, especially in hematological malignancies. This success has sparked growing interest in extending the application of CAR-Ts to solid tumors, including gliomas. Gliomas—in particular, glioblastoma multiforme (GBM)—are among the most aggressive primary brain tumors, associated with a poor prognosis and a median survival of approximately one year after diagnosis. However, the translation of CAR-T therapy to gliomas presents significant challenges, related to factors such as tumor heterogeneity, presence of the blood–brain barrier (BBB), and a strongly immunosuppressive tumor environment.

Neurotransmitter Systems in Alzheimer’s Disease

Alzheimer’s disease (AD), the leading cause of global dementia, is a multifactorial process that goes beyond the accumulation of β-amyloid (Aβ) plaques and tau protein tangles, including glia cell-mediated neuroinflammation, vascular dysfunction, metabolic alterations, and synaptic loss. Its complex etiology also involves oxidative stress and mitochondrial dysfunction. Multiple neurotransmitter systems involved in the pathogenesis and the various cognitive and non-cognitive symptoms of AD are thus altered. The cholinergic system, historically the first to be associated with AD, suffers early degeneration and loss of neurons/receptors, correlating with cognitive impairment. The glutamatergic system, the main excitatory system, exhibits excitotoxicity due to increased extracellular glutamate and alterations in NMDA/AMPA receptor distribution, exacerbating neuronal damage.

/* */