English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Objectives   Treatment of HIV-infected patients is associated with early onset of aging-related comorbidities. Some of the adverse effects of antiretroviral therapy have been attributed to the mitochondrial toxicity of nucleoside reverse transcriptase inhibitors (NRTI), and it is of note that mitochondrial dysfunction and oxidative stress are involved in the aging processes. In this regard, we examined whether NRTIs could accelerate the senescence of cultured cells.Methods   Human fibroblasts were exposed to NRTIs from culture passage 1 to 14. Cytochrome c-oxidase (COX) subunits 2 and 4, mitochondrial potential and mass, and reactive oxygen species (ROS) were quantified at each passage. Proliferation, cell-cycle arrest, senescence-associated β-galactosidase activity, and morphology were assessed in parallel. Mitochondrial and senescence markers were assessed in cultured murine preadipocytes and in fat samples from lipodystrophic HIV-infected patients.Results   Stavudine and zidovudine induced mitochondrial dysfunction and increased ROS levels in fibroblasts at early culture passages, while cell division gradually slowed. At passages 8–12, fibroblasts exposed to stavudine or zidovudine but not abacavir, didanosine, lamivudine and tenofovir were senescent, on the basis of p16 INK4  and p21 WAF-1  protein expression, cell morphology and senescence-associated-β-galactosidase activity. Senescence markers and COX2 underexpression were also found in 3T3-F442A preadipocytes exposed for 7 weeks to stavudine or zidovudine, but not lamivudine, and in adipose tissue samples from lipodystrophic HIV-infected patients on antiretroviral regimens containing stavudine or zidovudine.Conclusions   Mitochondrial changes and oxidative damage could partly explain the premature senescence of fibroblasts and adipose cells induced by stavudine and zidovudine. This suggests that thymidine analogues might be involved in the early aging-related diseases observed in some HIV-infected patients taking antiretroviral drugs.

Contribution of Mitochondrial Dysfunction and Oxidative Stress to Cellular Premature Senescence Induced by Antiretroviral Thymidine Analogues