TreatmentsRadiofrequency (RF) devices intentionally heat dermal and subdermal tissues to induce collagen denaturation and neocollagenesis.
While most systems are designed to maintain epidermal protection, the delivered energy often raises intradermal temperatures above 45 °C, a threshold at which thermal shock and genotoxic effects have been documented.
At 42–45 °C, cells activate heat shock proteins (HSPs) with protective and chaperone functions [1]. However, above 45 °C, protective mechanisms are overwhelmed, leading to a cascade of molecular injuries:
oxidative dna damage: excessive reactive oxygen species (ROS) are generated, causing oxidation of guanine bases and accumulation of 8-oxo-7,8-dihydro-2′-deoxyguanosine (8-oxo-dG) adducts [2].
DNA strand breaks: exposure to 45–55 °C induces single- and double-strand breaks (DSBs), measurable by γ-H2AX foci and comet assays [3,4].
Protein–DNA crosslinks and impaired chromatin structure, reducing DNA repair efficiency [5].
Activation of apoptotic pathways: thermal stress triggers p53 activation, mitochondrial dysfunction, and caspase-mediated apoptosis in dermal fibroblasts [6].
Chromosomal aberrations: prolonged or repeated exposures above 47 °C have been associated with structural DNA abnormalities in experimental models [7].
Clinically, these subcellular effects are not immediately visible. They may manifest indirectly through:
- accelerated cell senescence,
- reducing regenerative capacity;
- fibroblast apoptosis and loss of dermal density;
- potential long-term genomic instability if repair mechanisms are insufficient.
Although no direct epidemiological link has yet been established between aesthetic RF treatments and skin cancer, the documented DNA damage beyond 45 °C underscores the importance of precise thermal control and careful treatment planning.
References .
1.Dewhirst MW, Viglianti BL, Lora-Michiels M, Hoopes PJ, Hanson M. Thermal dose requirement for tissue effect: experimental and clinical findings. Cancer Res. 2003;63(23):7563-70.
2. Chatterjee S, et al. Heat-induced oxidative stress causes DNA damage and apoptosis in dermal fibroblasts. J Cell Biochem. 2015;116(11):2394-406.
3. Roti Roti JL. Cellular responses to hyperthermia (40–46 °C): cell killing and molecular events. Int J Hyperthermia. 2008;24(1):3-15
4. Nakamura T, et al. Heat shock induces DNA double-strand breaks detectable by γ-H2AX in human cells. Mutat Res. 2018;809:1-7.
5. Kampinga HH, et al. Hyperthermia, DNA repair and chromatin remodeling: facts and hypotheses. Int J Hyperthermia. 2004;20(5):455-72.
6. Mivechi NF, et al. Heat shock and apoptosis: role of p53, caspases and ROS. Cell Stress Chaperones. 2007;12(3):237-44.
7. Overgaard J, et al. Chromosomal damage induced by hyperthermia in mammalian cells. Radiat Res. 1980;82(1):10-21.
