特定频率振动与血管内皮细胞铁死亡相关指标的关联性OA

[Background]Prolonged vibration exposure can lead to vascular endothelial cell dysfunction and cellular injury.However,research on the association between vibration and ferroptosis in vascular endothelial cells remains insufficient. [Objective]To explore whether occupational vibration exposure is associated with alterations in serum markers related to ferroptosis in patients with hand-arm vibration disease(HAVD),and to further investigate,through in vitro cell experiments,whether vibration exposure may induce ferroptosis in vascular endothelial cells. [Methods]①A judgmental sampling method was employed to select 50 workers with HAVD(the HAVD group),50 vibration-exposed workers without HAVD(the vibration exposure group),and 50 non-hand-transmitted vibration-exposed workers(the control group).Serum iron levels,malondialdehyde(MDA)content,and superoxide dismutase(SOD)levels were measured using serum iron assay kits,MDA detection kits,and SOD detection kits,respectively.One-way analysis of variance and binary logistic regression analysis were per-formed to examine the relationships between these indicators and HAVD.②Human umbilical vein endothelial cells(HUVEC)were divided into a vibration group and a control group.The vibration group was subjected to vibration at 120 Hz with an acceleration of 6.5 m·s-2 and further subdivided into four subgroups:1 d 2 h,1 d 4 h,2 d 2 h,and 2 d 4 h.The control group was treated identically except for vibration exposure.Cellular iron(Fe2+)content and reduced glutathione(GSH)levels in HUVEC were measured using ferrous iron colorimetric assay kits and GSH colorimetric assay kits,respectively,to assess the effects of different vibration exposure schedules.Real-time quantitative polymerase chain reaction(RT-qPCR)was performed to detect the mRNA expression levels of ferroptosis-related genes,including acyl-CoA synthetase long-chain family member 4(ACSL4),tumor suppressor protein P53(P53),ferritin heavy chain 1(FTH1),and glutathione peroxidase 4(GPX4).Western blot analysis was conducted to determine the protein expression levels of ferroptosis-related markers in HUVEC. [Results]①Compared with the control group,the patients in the HAVD group showed increased serum iron and MDA levels,along with decreased SOD levels(P<0.05).The logistic regression analysis indicated that elevated serum iron levels were significantly associated with an increased risk of HAVD(OR=4.034;95%CI:2.063,7.887),and elevated MDA levels were also associated with an increased risk of HAVD(OR=1.523;95%CI:1.026,1.936).②Compared with the control group,increased intracellular Fe2+content and decreased GSH content were observed in HUVECs in the 1 d 4 h and 2 d 4 h vibration subgroups(P<0.05).The RT-qPCR results showed that,compared with the control group,vibration exposures of 1 d 4 h and 2 d 4 h significantly upregulated the expression of ACSL4 and P53(P<0.05),whereas the mRNA expression levels of GPX4 and FTH1 were downregulated in all vibration-exposed endothelial cells(P<0.05).The Western blot results revealed that,compared with the control group,the vibration exposure schedules of 1 d 2 h and 1 d 4 h significantly upregulated the protein expression levels of ACSL4 and P53(P<0.05),while the vibration exposure schedules of 1 d 4 h,2 d 2 h,and 2 d 4 h significantly downregulated the protein expression levels of FTH1 and GPX4(P<0.05). [Conclusion]Occupational vibration exposure is associated with alterations in iron metabolism and oxidative stress status in workers with HAVD.The in vitro experiments further demonstrates that vibration stimulation induces intracellular iron accumulation and reduces antioxidant capacity in vascular endothelial cells,accompanied by dysregulated expression of ferroptosis-related molecules.These findings suggest that ferroptosis may play a role in vibration-induced vascular injury and the pathogenesis of HAVD.