ETM Experimental and Therapeutic Medicine 1792-0981 1792-1015 D.A. Spandidos 10.3892/etm.2026.13189 ETM-32-1-13189 Expression of Concern [Expression of Concern] Endogenous Nampt upregulation is associated with diabetic nephropathy inflammatory-fibrosis through the NF-κB p65 and Sirt1 pathway; NMN alleviates diabetic nephropathy inflammatory-fibrosis by inhibiting endogenous Nampt ChenYe LiangYuzhen HuTingting WeiRiming CaiCongjie WangPing WangLingyu QiaoWei FengLeping 072026 20052026 32 1 194 Copyright: © 2026 Chen et al. 2026 This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

Exp Ther Med 14:4181–4193, 2017; DOI: 10.3892/etm.2017.5098

Following the publication of this paper, it was drawn to the Editor’s attention by a concerned reader that the Sirt1 western blotting data shown in Fig. 4A on p. 4187 were strikingly similar to the Sirtl western blotting data shown in Fig. 6A on p. 4188, even though the experimental conditions reported for these figure parts were apparently different.

The authors have been contacted by the Editorial Office to offer an explanation for the apparent re-use of the same data in this paper, and we are awaiting their response. Owing to the fact that the Editorial Office has been made aware of potential issues surrounding the scientific integrity of this paper, we are issuing an Expression of Concern to notify readers of this potential problem while the Editorial Office continues to investigate this matter further.