NAD+ Treatment Can Prevent Rotenone-Induced Increases in DNA Damage, Bax Levels and Nuclear Translocation of Apoptosis-Inducing Factor in Differentiated PC12 Cells

Several studies have revealed a correlation between chronic inflammation and nicotinamide adenine dinucleotide (NAD+) metabolism, but the precise mechanism involved is unknown. Here, we report that the genetic and pharmacological inhibition of nicotinamide phosphoribosyltransferase (Nampt), the rate-limiting enzyme in the salvage pathway of NAD+ biosynthesis, reduced oxidative stress, inflammation, and keratinocyte DNA damage, hyperproliferation, and cell death in zebrafish models of chronic skin inflammation, while all these effects were reversed by NAD+ supplementation. Similarly, genetic and pharmacological inhibition of poly(ADP-ribose) (PAR) polymerase 1 (Parp1), overexpression of PAR glycohydrolase, inhibition of apoptosis-inducing factor 1, inhibition of NADPH oxidases, and reactive oxygen species (ROS) scavenging all phenocopied the effects of Nampt inhibition. Pharmacological inhibition of NADPH oxidases/NAMPT/PARP/AIFM1 axis decreased the expression of pathology-associated genes in human organotypic 3D skin models of psoriasis. Consistently, an aberrant induction of NAMPT and PARP activity, together with AIFM1 nuclear translocation, was observed in lesional skin from psoriasis patients. In conclusion, hyperactivation of PARP1 in response to ROS-induced DNA damage, fueled by NAMPT-derived NAD+, mediates skin inflammation through parthanatos cell death.

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Mitochondrial-to-nuclear translocation of apoptosis-inducing factor in cardiac myocytes during oxidant stress: potential role of poly(ADP-ribose) polymerase-1

Cardiovascular Research ◽

10.1016/s0008-6363(04)00177-4 ◽

2004 ◽

Author(s):

M CHEN

Keyword(s):

Cardiac Myocytes ◽

Potential Role ◽

Nuclear Translocation ◽

Oxidant Stress ◽

Apoptosis Inducing Factor

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Transcriptome profiling of cells exposed to particular and intense electromagnetic radiation emitted by the "SG-III" prototype laser facility

Scientific Reports ◽

10.1038/s41598-021-81642-5 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Jiangbin Wei ◽

Qiwu Shi ◽

Lidan Xiong ◽

Guang Xin ◽

Tao Yi ◽

...

Keyword(s):

Dna Damage ◽

Pc12 Cells ◽

Inertial Confinement Fusion ◽

Biological Effects ◽

Harmful Effect ◽

Transcriptome Profiling ◽

Target Chamber ◽

Target Range ◽

Inertial Confinement ◽

Laser Facility

AbstractThe experiment of inertial confinement fusion by the “ShengGuang (SG)-III” prototype laser facility is a transient and extreme reaction process within several nanoseconds, which could form a very complicated and intense electromagnetic field around the target chamber of the facility and may lead to harmful effect on people around. In particular, the biological effects arising from such specific environment field could hardly be ignored and have never been investigated yet, and thus, we reported on the investigation of the biological effects of radiation on HaCat cells and PC12 cells to preliminarily assess the biological safety of the target range of the "SG-III" prototype laser facility. The viability revealed that the damage of cells was dose-dependent. Then we compared the transcriptomes of exposed and unexposed PC12 cells by RNA-Seq analysis based on Illumina Novaseq 6000 platform and found that most significantly differentially expressed genes with corresponding Gene Ontology terms and pathways were strongly involved in proliferation, transformation, necrosis, inflammation response, apoptosis and DNA damage. Furthermore, we find increase in the levels of several proteins responsible for cell-cycle regulation and tumor suppression, suggesting that pathways or mechanisms regarding DNA damage repair was are quickly activated. It was found that "SG-III" prototype radiation could induce DNA damage and promote apoptotic necrosis.

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DNase II mediates a parthanatos-like developmental cell death pathway in Drosophila primordial germ cells

Nature Communications ◽

10.1038/s41467-021-22622-1 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Lama Tarayrah-Ibraheim ◽

Elital Chass Maurice ◽

Guy Hadary ◽

Sharon Ben-Hur ◽

Alina Kolpakova ◽

...

Keyword(s):

Dna Damage ◽

Cell Death ◽

Germ Cells ◽

Nuclear Translocation ◽

Primordial Germ Cells ◽

Nuclear Accumulation ◽

Dependent Manner ◽

Dnase Ii ◽

Cell Death Pathway ◽

Parp 1

AbstractDuring Drosophila embryonic development, cell death eliminates 30% of the primordial germ cells (PGCs). Inhibiting apoptosis does not prevent PGC death, suggesting a divergence from the conventional apoptotic program. Here, we demonstrate that PGCs normally activate an intrinsic alternative cell death (ACD) pathway mediated by DNase II release from lysosomes, leading to nuclear translocation and subsequent DNA double-strand breaks (DSBs). DSBs activate the DNA damage-sensing enzyme, Poly(ADP-ribose) (PAR) polymerase-1 (PARP-1) and the ATR/Chk1 branch of the DNA damage response. PARP-1 and DNase II engage in a positive feedback amplification loop mediated by the release of PAR polymers from the nucleus and the nuclear accumulation of DNase II in an AIF- and CypA-dependent manner, ultimately resulting in PGC death. Given the anatomical and molecular similarities with an ACD pathway called parthanatos, these findings reveal a parthanatos-like cell death pathway active during Drosophila development.

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