Heat pulses reset dampened circadian rhythms in mouse cartilage explants
In cartilage explants from PER2::LUC reporter mice, a 60-minute 43 °C heat pulse resynchronised circadian rhythms in young and aged animals and countered IL-1α disruption; this is ex vivo mouse work, not a human treatment. [1]
Automatic summary · not editorially reviewed
The key findings
Femoral head cartilage explants from PER2::LUC circadian reporter mice were exposed to heat shock at various temperatures and durations, with bioluminescence recorded in real time over several days. [1]
A 60-minute pulse at 43 °C resynchronised PER2::LUC rhythms in cartilage explants from young and aged mice and counteracted circadian disruption caused by IL-1α treatment. [1]
Inhibiting HSP90 with 17-DMAG or perturbing F-actin polymerisation markedly attenuated the heat-induced resynchronisation, implicating these pathways. [1]
The source at a glance
- Study type / format
- Ex vivo mouse cartilage explant study (abstract).
- Population / context
- Femoral head cartilage explants from young and aged PER2::LUC circadian reporter mice.
- Summary based on
- Study abstract
- Original publication
- October 8, 2026
Mouse cartilage explants and circadian reporter
The study asked whether heat pulses can resynchronise dampened circadian rhythms in articular cartilage. Femoral head cartilage explants came from PER2::LUC circadian reporter mice, so the clock signal could be measured as bioluminescence. Explants were exposed to heat shock at various temperatures and durations, and bioluminescence was recorded in real time over several days. The abstract links circadian clock disruption, such as during ageing, to cartilage degeneration in mice and higher osteoarthritis risk in humans.
Supporting source [1]
43 °C pulse resynchronised rhythms in young and aged mice
A 60-minute pulse at 43 °C resynchronised PER2::LUC rhythms in cartilage explants from both young and aged mice. The heat shock also counteracted circadian disruption caused by IL-1α treatment. The conclusion states that the acute 43 °C pulse enhanced circadian amplitude and reset the phase of damped rhythms in ex vivo murine cartilage. Inhibiting HSP90 with 17-DMAG or disturbing actin polymerisation markedly weakened the heat-induced resynchronisation, implicating HSP90 and actin/Rho-ROCK signalling in the response.
Supporting source [1]
Experimental cue only; human heating regimens untested
The authors describe heat as an experimental synchronising cue for cartilage clocks and call for further investigation of heating regimens in osteoarthritis-relevant models. This was ex vivo mouse cartilage, not a human study, and no clinical outcome was measured. The abstract does not report sample sizes, the number of replicates or how long the resynchronisation lasted. It also does not establish that heating affects osteoarthritis in people or that it is safe.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. This is ex vivo mouse cartilage, not a human study, and no clinical outcome is reported. Sample sizes, replicate numbers and duration of resynchronisation are not given.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Gonçalves CF, Pathiranage DR, Paszek A, El-Houni Z, Li S, Tawy G, Biant L, Hoyland JA, Dudek M, Meng QJ. · europepmc.org · October 8, 2026