Estudo descobre que o melanoma se espalha mais na meia-idade

Uma nova pesquisa do Fox Chase Cancer Center mostra que o melanoma se espalha de forma mais agressiva em camundongos de meia-idade do que naqueles muito jovens ou muito velhos. O padrão parece estar ligado a mudanças em um tipo específico de célula imunológica ao longo do tempo.

Os pesquisadores apresentaram os resultados na reunião anual da American Association for Cancer Research. A propagação do câncer atingiu seu pico em camundongos de meia-idade, enquanto permaneceu menor em camundongos jovens e diminuiu novamente naqueles muito velhos. Mitchell Fane, o investigador principal, observou que a maioria dos estudos laboratoriais utiliza apenas camundongos jovens, o que limita a compreensão de como o câncer se comporta em pacientes mais velhos.

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Study links gut “luminal exosomes” to age-related inflammation and metabolic decline in mice

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Researchers at Marshall University report that microscopic particles found in the gut lumen—known as exosomes—differ between young and old mice and can influence metabolism and gut-barrier function when transferred between animals. The findings, published in the journal Aging Cell, suggest these particles may help drive biological changes associated with aging, though the work is preclinical.

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.

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Researchers reported at Digestive Disease Week (DDW) 2026 that older mice given fecal microbiota transplants made from their own preserved, younger-age stool samples showed less liver inflammation and injury—and none developed liver cancer in the experiment.

Scientists at Johns Hopkins Medicine have pinpointed the gene KLF5 as a key driver of pancreatic cancer metastasis through epigenetic changes rather than DNA mutations. Using CRISPR technology, researchers found that KLF5 promotes tumor growth and invasion by altering DNA packaging and activating other cancer-related genes. The findings, published in Molecular Cancer, suggest potential new treatment targets.

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A 20-year experiment cloning mice has revealed that clones develop significantly more genetic mutations than naturally reproduced mice, accumulating to fatal levels after multiple generations. Researchers led by Teruhiko Wakayama at Yamanashi University in Japan found over 70 mutations per clone generation on average, three times higher than in controls. The findings, published in Nature Communications, raise concerns for applications in farming, conservation and de-extinction efforts.

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