The Influence of Cellular Senescence on Intracellular Vitamin C Transport, Accumulation, and Function

Overview

Journal Mol Cell Biochem

Publisher Springer

Specialty Biochemistry

Date 2018 Jan 23

PMID 29356987

Citations 3

Authors

Yasukazu Saitoh

Atsushi Nakawa

Tomomi Tanabe

Takeo Akiyama

Affiliations

Soon will be listed here.

Abstract

In humans, vitamin C (VC) accumulates at higher concentrations in cells than in plasma, and this intracellular accumulation appears critical to several important physiological functions. However, although VC accumulation decreases in the elderly, the influence of cellular senescence on the transport, accumulation, and function of VC is poorly understood. In this study, we investigated the effects of supplementation with both ascorbic acid (AsA) and dehydroascorbic acid (DehAsA) on the uptake and accumulation of VC, AsA, and DehAsA into cells and the effect of AsA on the levels of intracellular reactive oxygen species (ROS) in human fibroblast TIG-1 cells. We also assessed how that supplementation affected senescence-associated changes in intracellular VC transport and accumulation. AsA supplementation significantly increased intracellular levels of AsA, DehAsA, and total VC (i.e., reduced AsA plus oxidized DehAsA) in senescent cells compared with young cells. DehAsA supplementation also significantly increased intracellular AsA and total VC levels in senescent cells, but not DehAsA, and the increases were less than after adding AsA. Among the molecules related to VC accumulation, the mRNA and protein expressions of sodium-dependent VC transporter 2 (SLC23A2) were increased in senescent cells. Furthermore, intracellular peroxide and superoxide anion levels were higher in senescent cells, with AsA supplementation markedly attenuating spontaneous intracellular peroxide accumulation. Overall, our results therefore suggest that VC transport and accumulation improved in senescent human fibroblast TIG-1 cells due to the adaptive upregulation of sodium-dependent VC transporter 2 in response to increased ROS levels. We conclude that adequate supplementation with AsA can effectively mitigate senescence-associated intracellular ROS.

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