Scavenger receptor-AI-targeted ultrasmall gold nanoclusters facilitate in vivo MR and ex vivo fluorescence dual-modality visualization of vulnerable atherosclerotic plaques.

Owing to the high morbidity and mortality of cardiovascular diseases resulting from atherosclerosis, developing specific noninvasive diagnostic methods to distinguish vulnerable atherosclerotic plaques becomes urgent and mandatory. Herein, scavenger receptors AI (SR-AI), a secreted biomarker associated with foam macrophages, was selected as a target for identifying vulnerable plaques. A dual-modality imaging probe (PP1-Au@GSH@Gd NCs) was constructed by covalently attaching a peptidic SR-AI ligand, PP1 to gadolinium-integrated gold nanoclusters, which exhibited remarkably improved fluorescence signal and longitudinal relaxivity with highly loaded Au and Gd species. In vitro cellular binding studies showed preferential affinity of PP1-Au@GSH@Gd NCs to activated macrophages in SR-AI-dependent manner. In vivo MR/fluorescence images presented robust and prolonged plaque contrast enhancement in established ApoE-/- mice models thanks to favorable targeting efficacy of PP1-Au@GSH@Gd NCs. Collectively, the noninvasive MR/fluorescence molecular imaging strategy with PP1-Au@GSH@Gd NCs holds great promise for precise clinical diagnosis of vulnerable plaques.

Antitumor Effect of Lenvatinib Combined with Alisertib in Hepatocellular Carcinoma by Targeting the DNA Damage Pathway.

METHODS: Immunohistochemical staining, sequencing, and genetic analysis of liver cancer tissues were performed. The antitumor efficacy of single-agent or combination treatment was measured by cell counting kit-8 assay and colony formation assays. Their antiproliferative and apoptosis activity is evaluated by cell cycle analyses and wound healing assays. The DNA-related proteins were also measured by Western blotting and immunohistochemical staining. The HepG2 xenograft model was used to detect the effects of lenvatinib-alisertib on the antitumor activity. RESULTS: AURKA was found to be upregulated in HCC tissues (77.3%, 17/22). Combined alisertib and lenvatinib treatment significantly enhanced the inhibition of proliferation and migration in HepG2 and Hep3B cell lines compared to single-agent treatments (all Ps < 0.01). Alisertib alone or in combination with lenvatinib demonstrated a significant increase in the percentage of super-G2 cells (lenvatinib 1 µM vs. lenvatinib 1 µM + alisertib 0.1 µM 8.84 ± 0.84 vs. 34.0 ± 1.54, P < 0.001). Discontinuous spindles and missegregated chromosomes in HCC cells treated with alisertib in combination with lenvatinib were observed. We further revealed that combined treatment inhibited the expression of DNA damage pathway proteins compared to those of single-agent treatments. In nude mice, combined administration of alisertib combined with lenvatinib significantly enhanced the suppression of tumor growth and induced apoptosis (all Ps < 0.01). CONCLUSIONS: Our findings provide evidence for the possible use of alisertib in combination with lenvatinib in the treatment of HCC for better therapeutic outcomes.