ABSTRACT
BACKGROUND: Variable magnetic field of low frequency (200-300 Hz) is one of physical methods used in reducing pain as well as regeneration of bone and soft tissue. In medical literature there are case reports about successful treatment of chronic wound healing with this method. However, there is a lack of research that could explain the mechanism of action of magnetic field in this area. Literature data show that magnetic fields have an influence on cells cultures in vitro. Cells reaction depends on cells line, field parameters and time of exposition. OBJECTIVE: In our study we checked if the magnetic field of 180-195 Hz frequency influences Balb 3T3 cells viability. MATERIAL AND METHODS: This study was conducted on mouse fibroblast Balb 3T3 cells, and the influence of variable magnetic field on cells was checked. Magnetic field was generated by Viofor JPS System Classic (Med&Life). Cells were seeded on 96-well plates. After 24 hours the cells culture was exposed on magnetic fields. Two controls and six groups was included in the study. Two programs generated by Viofor JPS System Classic were chosen: M1P2 and M2P2, as well as two intensities 6 and 12. Groups 1, 2, 5 and 6 were exposed once within two days, groups 3 and 4 were exposed three times a day every hour within two days. Experiment lasted two days and was repeated 3-5 times. RESULTS: Experiment was evaluated with colorimetric MTT test. The test showed influence of magnetic field generated by Viofor JPS System Classic on viability of Balb 3T3 cells. Three from six chosen programs resulted in the increase of viability, compare to control. The control was taken as 100%. In groups 139%, 128%, 108% and 92% of viability was noted. Results were statisticaly significant in four groups (p < 0.05, Student's t test). CONCLUSIONS: The influence of magnetic fields generated by Viofor JPS System Classic (Med&Life) on mouse fibroblast Balb 3T3 cells was noted. Results suggest potential beneficial effect of this physical method on chronic wound treatment.
Subject(s)
BALB 3T3 Cells/radiation effects , Magnetic Fields , Wound Healing/radiation effects , Animals , BALB 3T3 Cells/cytology , Cell Survival/radiation effects , Cells, Cultured , MiceABSTRACT
When substances are developed in the aim to be a constituent of personal care products, and to be applied on the skin, it is necessary to carry out an assessment of potential phototoxic hazard. Phototoxicity is skin reaction caused by concurrent topical or systemic exposure to specific molecule and ultraviolet radiation. Most phototoxic compounds absorb energy particularly from UVA light leading to the generation of activated derivatives which can induce cellular damage. This type of adverse cutaneous response can be reproduced in vitro using different models of phototoxicity such as the validated 3T3 Neutral Red Uptake (NRU) phototoxicity assay. In the present study we utilised two different cell lines (the murine fibroblastic cell line 3T3 and the rabbit cornea derived cell line SIRC) to compare the photo-irritation potential of a strong phototoxic compound, chlorpromazine, to a weaker composite, such as 8-methoxypsoralen and Bergamot oil. After comparison of the different systems, five other essential oils were tested with both cell lines. Cellular damage was evaluated by the NRU cytotoxicity test or by MTT conversion test.
Subject(s)
BALB 3T3 Cells/drug effects , Methoxsalen/toxicity , Perfume , Photosensitizing Agents/toxicity , Plant Oils/toxicity , Toxicity Tests , Animals , BALB 3T3 Cells/metabolism , BALB 3T3 Cells/radiation effects , Cell Survival/drug effects , Cell Survival/radiation effects , Chlorpromazine/toxicity , Cornea/drug effects , Cornea/metabolism , Cornea/radiation effects , Cosmetics/toxicity , Mice , Neutral Red/metabolism , Oils, Volatile/chemistry , Oils, Volatile/toxicity , Photosensitizing Agents/classification , RabbitsABSTRACT
Sister chromatid exchanges (SCEs) are symmetrical exchanges between newly replicated chromatids and their sisters. While homologous recombination may be one of the principal mechanisms responsible for SCEs, the full details of their molecular basis and biological significance remain to be elucidated. Following exposure to ultraviolet light B (UVB), mitomycin C (MMC) and cisplatin, we analyzed the location of SCEs on metaphase chromosomes in Chinese hamster CHO cells. The frequency of SCEs increased over the spontaneous level in proportion to the agent's dose. UVB-induced SCEs occurred frequently in telomere regions, as cisplatin-induced SCEs did, differing from MMC-induced ones. The remarkable difference of intrachromosomal distribution among the three mutagens may be attributed to the specificity of induced DNA lesions and structures of different chromosome regions. Telomeric DNA at the end of chromosomes is composed of multiple copies of a repeated motif, 5'-TTAGGG-3' in mammalian cells. Telomeric repeats may be potential targets for UVB and cisplatin, which mainly form pyrimidine dimers and intrastrand d(GpG) cross-links, respectively, resulting in SCE formation. UVB irradiation shortened telomeres and augmented the telomerase activity. The possible implications of the frequent occurrence of SCEs in telomere regions are discussed in connection with the maintenance of telomere integrity.
