What this means
Researchers compared normal mice with mice that had one copy of Foxn1 turned off. The mice differed in skin thickness, collagen, and aging markers. This suggests Foxn1 may play a role in skin aging, but it does not show how it works in people.
Plain-English summary written by an AI model from the abstract. The original is below.
- Who it was tested in
- Mice at three ages: young, middle-age, and old
- Kind of research
- Research in animals or cells
The science
- Original title
- Foxn1 regulates epidermal structure, redox balance, and age related changes.
- Authors
- Machcinska-Zielinska S, Kopcewicz M, Wisniewska J et al.
- Journal
- BMC biology
- Published
- Oct 13, 2026
- Study type
- Lab or animal study · indexed as animal research
- PMID
- 42864634 ↗
Abstract
Background
Skin aging is a complex process, marked by structural decline, functional impairment, and diminished regenerative capacity. In this study, we shine a spotlight on the transcription factor Foxn1 and its pivotal role in modulating age-related changes in skin architecture and redox homeostasis. Using a murine model across three life stages (young - 20-days-old, middle-age - 1-year-old, old - 2-year-old), we compared wild-type (Foxn1+/+) and Foxn1 heterozygotic knock out (Foxn1+/-) mice to unravel the interplay between genetic regulation and skin aging.
What they found
Our findings reveal a striking impact of Foxn1 on skin morphology: Foxn1+/- mice displayed thinner epidermis, thicker dermis, and disrupted keratinocyte differentiation, favoring large spinous layer of epidermal cells. Notably, the skin of Foxn1+/+ mice was associated with increased collagen I and a shift toward repair-oriented fibers, whereas Foxn1+/- skin maintained elevated collagen III, hinting at a preserved regenerative profile. Additionally, while p21 expression rose with age in Foxn1+/+ mice, it remained low in Foxn1+/- mice, suggesting an altered senescence pathway. Intriguingly, Foxn1 also emerged as a modulator of the hypoxia response, oxidative stress levels, and cellular protection, particularly in young and middle-age mice. These effects diminished with advanced age, underscoring Foxn1's age-dependent regulatory dynamics. Together, these results position Foxn1 as one of key regulators of skin homeostasis and reveal its potential role in skin aging processes.
The authors' abstract, grouped under plain headings from its own section labels.
Machcinska-Zielinska S, Kopcewicz M, Wisniewska J et al. Foxn1 regulates epidermal structure, redox balance, and age related changes. BMC biology. 2026. doi:10.1186/s12915-026-02737-x. PMID: 42864634. https://pubmed.ncbi.nlm.nih.gov/42864634/