Human umbilical cord mesenchymal stem cells (hUCMSCs) are able to secrete growth factors, such as hepatocyte growth factor, vascular endothelial growth factor and insulin‑like growth factor‑1 (IGF‑1). The secretion of these growth factors by transplanted hUCMSCs have been identified to stimulate the growth of the host cells in the target organs or tissues. The aim of the present study was to investigate the effect of autocrine IGF‑1 on cell viability of hUCMSCs. The expression levels of IGF‑1 and the IGF‑1 receptor (IGF‑1R) in hUCMSCs were identified using immunocytochemistry staining. In order to block autocrine IGF‑1, hUCMSCs were treated with 5 µg/ml αIR‑3, a specific IGF‑1R antibody, for 24 h. The cells cultured in medium without αIR‑3 were used as the control group. Cell viability, apoptosis, cell cycle and the proliferation‑associated proteins were quantified using an MTT assay, flow cytometry and western blotting. The findings of the present study revealed that IGF‑1 and IGF‑1R were positively expressed in hUCMSCs. Treatment with αIR‑3 significantly reduced cell viability and increased apoptosis of hUCMSCs (P<0.01). Cell cycle analysis indicated that the number of cells in the G2/M phase was reduced in the αIR‑3‑treated group compared with the control group. Western blotting revealed that the expression levels of phosphorylated (p)‑protein kinase B (Akt), p‑glycogen synthase kinase 3β (GSK‑3β), p‑p70 S6 kinase and cyclin D1 were markedly reduced and p21 expression was markedly increased in the αIR‑3‑treated group as compared with the control group (P0.05). The findings of the present study suggested that the autocrine IGF‑1 from hUCMSCs may be capable of influencing cell viability of hUCMSCs, which may be associated with activation of Akt/GSK‑3β signaling pathway.

The aim of the present study was to investigate the effects of S‑adenosyl methionine (SAMe) on infectious premature inflammatory factors and uterine contraction, and to further explore its mechanism of action via the transient receptor protein 3 (TRPC3)/protein kinase Cβ (PKCβ)/C‑kinase‑activated protein phosphatase‑1 inhibitor of 17 kDa (CPI‑17) signaling pathway, following intervention by a TRPC3 inhibitor. A rat model of premature delivery induced by lipopolysaccharide (LPS) was established. Following treatment with SAMe and inhibiting TRPC3 expression, rat serum and uterus were isolated. Hematoxylin and eosin staining was used to observe the histopathological changes in the uterus. Uterine muscle strips in vitro were selected to measure the changes in muscle tension. ELISA was utilized to measure the changes in serum inflammatory factor and oxidative stress indexes. Immunohistochemistry, western blot assay and reverse transcription‑quantitative polymerase chain reaction were applied to detect calcium channel protein expression in the uterus. Western blot analysis was employed to measure the expression of TRPC3/PKCβ/CPI‑17 signaling pathway‑related proteins. TRPC3 was highly expressed in the uterus of rat models of premature delivery induced by LPS. Following treatment with SAMe, inflammatory cell infiltration markedly reduced in the uterus and the tension of in vitro uterine muscle strips significantly decreased. SAMe treatment suppressed inflammatory reaction and oxidative stress, and diminished L‑type and T‑type calcium channel protein expression. TRPC3/PKCβ/CPI‑17 signaling pathway‑related protein expression was also reduced. When TRPC3 expression was suppressed, the effects of SAMe against inflammation and oxidative stress were diminished. TRPC3/PKCβ/CPI‑17 signaling pathway‑related protein expression significantly increased. SAMe was able to reduce inflammatory reaction and oxidative stress in the uterus of rat model of infectious premature delivery induced by LPS, prolong delivery time, reduce the mortality rate of offspring rats, and serve a therapeutic role. This effect is likely achieved via the regulation of uterine contractions and childbirth through the TRPC3/PKCβ/CPI‑17 signaling pathway.

The objective of this study was to investigate the effects of serum amyloid 1 (SAA1) on activation of endothelial cells, formation of foam cells, platelet aggregation, and monocyte/platelet adhesion to endothelial cells. The effect of SAA1 on the inflammatory activation of endothelial cells was investigated by detecting the expression of inflammatory factors and adhesion molecules. The role of SAA1 in formation of foam cells was verified by detecting lipid deposition and expression of molecules related to the formation of foam cells. After platelets were stimulated by SAA1, the aggregation rate was evaluated to determine the effect of SAA1 on platelet aggregation. Monocytes/platelets were cocultured with human umbilical vein endothelial cells (HUVECs) pretreated with or without SAA1 to determine whether SAA1 affected monocyte/platelet adhesion to endothelial cells. By inhibiting toll‐like receptor 4 (TLR4) function, we further identified the role of TLR4 signaling in SAA1‐mediated endothelial inflammatory activation, foam‐cell formation, and monocyte/platelet adhesion to HUVECs. SAA1 significantly increased the expression of adhesion molecules and inflammatory factors in HUVECs. Moreover, SAA1 also promoted lipid deposition and the expression of inflammatory factors and low‐density lipoprotein receptor‐1 (LOX‐1) in THP‐1‐derived macrophages. In addition, SAA1 induced platelet aggregation and enhanced monocyte/platelet adhesion to HUVECs. However, the TLR4 antagonist significantly inhibited SAA1‐induced endothelial cell activation, foam‐cell formation, and monocyte/platelet adhesion to HUVECs and downregulated the expression of myeloid differentiation factor 88 (MyD88), phosphor‐inhibitor of nuclear factor κB kinase subunit α/β (P‐IKKα/β), phospho‐inhibitor of nuclear factor κB subunit α (P‐IKBα), and phosphorylation of nuclear transcription factor‐κB p65 (P‐p65) in SAA1‐induced HUVECs and THP‐1 cells. Conclusively, it is speculated that SAA1 promotes atherosclerosis through enhancing endothelial cell activation, platelet aggregation, foam‐cell formation, and monocyte/platelet adhesion to endothelial cells. These biological functions of SAA1 may depend on the activation of TLR4‐related nuclear factor‐kappa B (NF‐κB) signaling pathway.

Anxiety and depression significantly contribute to heroin relapse, and addressing these issues could lower relapse rates. The basolateral amygdala (BLA) and nucleus tractus solitarius (NTS) are involved in regulating these emotions, but the molecular mechanisms during heroin withdrawal are not yet understood. Subcutaneous injection of heroin into C57BL/6J mice to simulate chronic dependence, withdrawal, and Exendin-4 treatment. Assess anxiety and depression-like behaviors using open field test (OFT), elevated plus maze (EPM), forced swimming test (FST), and tail suspension test (TST). Analyze neuronal and protein expression changes in the BLA brain area with Western blotting (WB) and immunofluorescence staining. Heroin dependence reduces glutamatergic neurons in BLA without affecting anxiety and depression-like behaviors, due to the inhibitory effect of heroin reward. During withdrawal, GLP-1 secretion by the NTS rises, increasing c-Fos and GLP-1 receptor expression in glutamatergic neurons of BLA, linked to heightened anxiety but not depression. A 7-day treatment with Exendin-4 (2 µg/kg) alleviates anxiety in withdrawal mice by downregulating GLP-1 signaling in the NTS-BLA circuit, indicating GLP-1’s role in regulating anxiety during heroin withdrawal. GLP-1 receptors within BLA may serve as molecular targets for modulating emotional states, thereby offering empirical support for strategies aimed at preventing heroin relapse.