Shandong Normal University

About: Shandong Normal University is a education organization based out in Jinan, Shandong, China. It is known for research contribution in the topics: Laser & Catalysis. The organization has 12378 authors who have published 12576 publications receiving 174572 citations.

Dihydroartemisinin targets VEGFR2 via the NF-κB pathway in endothelial cells to inhibit angiogenesis.

Abstract: The anti-malarial agent dihydroartemisinin (DHA) has strong anti-angiogenic activity. This study aimed to investigate the molecular mechanism underlying this effect of DHA on angiogenesis. We found that DHA shows a dose-dependent inhibition of proliferation and migration of in HUVECs. DHA specifically down-regulates the mRNA and protein expression of VEGFR2 in endothelial cells. Treatment with DHA increases IκB-α protein and blocks nuclear translocation of NF-κB p65. In addition, DHA directly regulates VEGFR2 promoter activity through p65 binding motif, and decreases the binding activity of p65 and VEGFR2 promoter, suggesting defective NF-κB signaling may underlie the observed effects of DHA on VEGFR2 expression. In the presence of the NF-κB inhibitor PDTC, DHA could not further repress VEGFR2. Co-treatment with PDTC and DHA produced minimal changes compared to the effects of either drug alone in in vitro angiogenesis assays. Similar findings were found in vivo through a mouse retinal neovascularization model examining the effects of PDTC and DHA. Our data suggested that DHA inhibits angiogenesis largely through repression of the NF-κB pathway. DHA is well tolerated, and therefore may be an ideal candidate to use clinically as an angiogenesis inhibitor for cancer treatment.

Single-Molecule Detection of Polynucleotide Kinase Based on Phosphorylation-Directed Recovery of Fluorescence Quenched by Au Nanoparticles.

Abstract: 5′-Polynucleotide kinase such as T4 polynucleotide kinase (T4 PNK) may catalyze the phosphorylation of 5′-hydroxyl termini in nucleic acids, playing a crucial role in DNA replication, DNA recombination, and DNA damage repair. Here, we demonstrate for the first time single-molecule detection of PNK based on phosphorylation-directed recovery of fluorescence quenched by Au nanoparticle (AuNP) in combination with lambda exonuclease-mediated cleavage reaction. In the presence of PNK, the γ-phosphate group from adenosine triphosphate (ATP) is transferred to 5′-hydroxyl terminus, resulting in 5′-phosphorylation of the hairpin probe. The phosphorylated hairpin probes may function as the substrates of lambda exonuclease and enable the removal of 5′ mononucleotides from the stem, leading to the unfolding of hairpin structure and the formation of binding probes. The resultant binding probes may specifically hybridize with the AuNP-modified capture probes, forming double-strand DNA (dsDNA) duplexes with 5′-phosphate ...

Existence of Solution for a Boundary Value Problem of Fractional Order

Abstract: The existence of one solution for a boundary value problem of fractional order is considered,involving α∈(3,4],Dα0+u(t)+f(t,u(t),u′(t))=0u(0)=0,u′(0)=0u″(1)=0,u'''(1)=g(u(1)) by using the Schauder fixed point theorem