Role of Selenoproteins in Redox Regulation of Signaling and the Antioxidant System: A Review.
Level 5 - mechanism / opinion, no new human data
Narrative review of biological mechanisms without systematic review methodology or primary empirical data
PubMed 32380763 · doi:10.3390/antiox9050383
What was done
The authors reviewed published literature on the biological roles of the 25 human selenoproteins, specifically evaluating their selenocysteine-dependent oxidoreductase activity, cellular antioxidant functions, redox signaling pathways, endoplasmic reticulum (ER) stress regulation, and involvement in disease states.
What was found
The abstract provides a descriptive mechanistic overview and does not report numerical data or effect sizes. It outlines the specific functions of key human selenoproteins: glutathione peroxidases scavenge hydrogen and lipid peroxides; thioredoxin reductases reduce oxidized thioredoxins and lipid hydroperoxides; selenoprotein R reduces methionine-R-sulfoxide to methionine; selenoprotein O mediates protein AMPylation in redox homeostasis; ER membrane selenoproteins (SelI, K, N, S, and Sel15) manage ER stress; and CXXU-motif selenoproteins (SelH, M, T, V, and W) act as putative oxidoreductases in redox-dependent cellular processes.
Why it matters
The paper provides a comprehensive structural and functional taxonomy of human selenoproteins, summarizing how selenocysteine-driven enzymatic pathways maintain intracellular redox balance and protein homeostasis.
Limits
As a narrative review, it lacks a systematic search protocol, risk of bias assessment, or statistical aggregation of evidence. No primary clinical, in vivo, or quantitative outcome data are presented in the abstract.
Cited by
- supports Several cellular antioxidant enzymes that remove free radicals incorporate selenium into their structure.