Duvor använder järnceller i levern för navigering

31 maj 2026

Rapporterad av AI

En ny studie visar att brevduvor förlitar sig på järnrika immunceller i levern för att känna av jordens magnetfält. Upptäckten erbjuder en ny förklaring till hur fåglar navigerar över långa avstånd, särskilt i dåligt väder.

Forskare vid bland annat University of Bonn och Max Planck Institute of Animal Behavior fann att makrofager i levern ackumulerar järn och uppvisar starka magnetiska egenskaper. Dessa celler sitter nära nervfibrer, vilket tyder på en väg för magnetiska signaler att nå hjärnan.

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Scientific illustration showing intestinal tuft cells signaling the brain via acetylcholine, serotonin, and the vagus nerve to suppress appetite during parasitic infections.

Intestinal cells signal brain to curb hunger during parasitic infections

25 mars 2026 Rapporterad av AI Bild genererad av AI

A team led by David Julius, the 2021 Nobel Prize winner in Medicine, has described the molecular mechanism by which intestinal tuft cells signal the brain to suppress appetite during parasitic infections. Published today in Nature, the study identifies communication via acetylcholine and serotonin that activates the vagus nerve. The finding could aid treatments for conditions like irritable bowel syndrome.

UCLA scientists reverse liver damage in mice by removing zombie cells

Researchers at UCLA have identified senescent immune cells, dubbed 'zombie' cells, that accumulate in aging livers and contribute to fatty liver disease. By eliminating these cells in mice, the team reversed liver damage and reduced body weight, even on an unhealthy diet. The findings, published in Nature Aging, suggest similar mechanisms may drive human liver conditions.

Study links loss of MHC class I on tumors to CD4+ T cell-driven ferroptosis

4 juni 2026 Rapporterad av AI Faktagranskad

Cancer cells that reduce MHC class I—a common way to evade CD8+ “killer” T cells—may become more vulnerable to destruction by CD4+ “helper” T cells through ferroptosis, according to research led by Baylor College of Medicine and collaborators at the University of Michigan and published in Nature Immunology.

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Scientists map organized smell receptors in mouse noses

Researchers at Harvard Medical School have uncovered a hidden map of smell receptors in mice noses, revealing neat stripes instead of random distribution. This structure aligns with brain mapping, challenging prior assumptions about olfaction. The findings, published April 28 in Cell, could aid treatments for smell loss.

South Korean researchers claim magnetic gene switch breakthrough amid skepticism

30 april 2026 Rapporterad av AI

Researchers at Dongguk University in Seoul have developed a magnetically controlled switch for turning on genes inside cells, as detailed in a recent Cell paper. The technique uses a specific electromagnetic signal to activate genes in mice and human cells. Critics, however, question the plausibility of the results and point to potential flaws in the study.

28 maj 2026 13:50

Duvor använder järnceller i levern för navigering

Relaterade artiklar

Intestinal cells signal brain to curb hunger during parasitic infections

UCLA scientists reverse liver damage in mice by removing zombie cells

Study links loss of MHC class I on tumors to CD4+ T cell-driven ferroptosis

Mouse study suggests restoring a youthful gut microbiome may curb age-related liver damage and cancer risk

UCSF study links iron-associated protein FTL1 to age-related memory decline in mice

New study shows moonlight controls red-necked nightjar's behavior

Scientists map organized smell receptors in mouse noses

South Korean researchers claim magnetic gene switch breakthrough amid skepticism

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