Objective To analyze the genetic diversity of Psammosilene tunicoides,an endangered and endemic medicinal plant,in southwest China.Methods The genetic diversity of seven representational populations of P.tunicoides including 137 individuals had been investigated by amplified fragment length polymorphisms(AFLP)maker technique.Results The genetic diversity had been revealed as follow:the Nei's genetic diversity index(He),Shannon's information index(I),percentage of polymorphic loci(PPB)were 0.243 4?0.179 1,0.373 5?0.248 5,and 82.30%,respectively at the species level;and 0.091 8?0.161 0,0.140 2?0.236 2,and 30.48%,respectively at population level.The genetic differentiation index(Gst)was 0.624 6 and genetic differentiation coefficient by Shannon's diversity(Ist)was 0.624 6.The result of dendrogram of seven populations indicated that Lijiang and Gejiu of Yunnan populations shared the maximum genetic identity,though they distributed in a relatively great geographical distance;Kunming population of Yunnan had the greater genetic distance from other populations.Nine characteristic fingerprint bands that can distinguish the different populations had been acquired.Conclusion The genetic diversity of P.tunicoides is relatively higher at the species levels,while lower within population levels,and a significant degree of genetic differentiation occurrs among the populations.There is little relativity between the relationship of populations and geographical distance.The combination of characteristic fingerprint bands between intraspecies and populations provide important basis data for germplasm resources diagnostics and plant breeding by AFLP maker technique.

Purpose: Cerebral ischemia is related to insufficient blood supply and is characterized by abnormal reactive oxygen species (ROS) production and cell apoptosis. Previous studies have revealed a key role for basic helix-loop-helix family member e40 (Bhlhe40) in oxidative stress and cell apoptosis. This study aimed to investigate the roles of miR-494-3p in cerebral ischemia/reperfusion (I/R) injury. Materials and Methods: A mouse middle cerebral artery occlusion (MCAO/R) model was established to mimic cerebral ischemia in vivo. Brain infarct area was assessed using triphenyl tetrazolium chloride staining. Oxygen-glucose deprivation/reoxygenation (OGD/R) operation was adopted to mimic neuronal injury in vitro. Cell apoptosis was analyzed by flow cytometry. The relationship between miR-494-3p and Bhlhe40 was validated by luciferase reporter and RNA immunoprecipitation assays. Results: Bhlhe40 expression was downregulated both in MCAO/R animal models and OGD/R-induced SH-SY5Y cells. Bhlhe40 overexpression inhibited cell apoptosis and reduced ROS production in SH-SY5Y cells after OGD/R treatment. MiR-494-3p was verified to bind to Bhlhe40 and negatively regulate Bhlhe40 expression. Additionally, cell apoptosis and ROS production in OGD/ R-treated SH-SY5Y cells were accelerated by miR-494-3p overexpression. Rescue experiments suggested that Bhlhe40 could reverse the effects of miR-494-3p overexpression on ROS production and cell apoptosis. Conclusion MiR-494-3p exacerbates brain injury and neuronal injury by regulating Bhlhe40 after I/R.

Objective: To investigate the clinical significance of tumor associated macrophages (TAM) in multiple myeloma (MM) and the relationship with angiogenesis and immunosuppression. Methods: Seventy cases of MM patients diagnosed from August 2015 to June 2017 were enrolled in the study as experimental group, 20 cases of benign hematological diseases (13 with iron deficiency anemia and 7 with megaloblastic anemia) patients as control group. Immunohistochemical method was used to detect the expression of CD163, CD34 and VEGF in bone marrow samples, and flow cytometry was used to detect the proportion of regulatory T cell (Treg cells), ELISA was used to detect the level of IL-10, and the clinical features were analyzed. Results: ①Among the 70 patients, there were 31 males and 39 females with a median age of 65 (50~78) years old. TAM infiltration density, microvascular density (MVD), VEGF expression level, Treg ratio and IL-10 level in bone marrow samples of 70 MM patients were significantly higher than those of benign hematological diseases (P<0.05). ②In the MM group, the above indexes of the patients with disease stabilized (15 cases) were lower than those of the newly diagnosed group (35 cases) and the relapse refractory group (20 cases) (P<0.05), those of relapse refractory group were higher than those of newly diagnosed group (P>0.05). ③Of the 35 newly diagnosed MM patients, 27 completed 4 courses of treatment. In the effective group (15 cases), the TAM infiltration density after treatment was significantly lower than that before treatment, the difference was statistically significant[(20.20±7.66) vs (28.87±11.97), t=2.362, P=0.025]; while in the ineffective group of 12 cases, the difference of the TAM infiltration density before and after treatment was not statistically significant[(42.00±13.76) vs (48.25±13.59), t=1.119, P=0.275]. ④TAM infiltration density in the effective group after bortezomib treatment (21 cases) were lower than those in the non-bortezomib treatment group (18 cases)[(16.52 ±4.26) vs (19.27 ±5.82), t=1.662, P=0.170]. ⑤The TAM infiltration density in MM patients was positively correlated with MVD, VEGF expression level, Treg cell ratio and IL-10 level (P<0.001). Conclusion The infiltration of TAM in the microenvironment of MM, which may promoting angiogenesis and inhibiting immune response, is related to the occurrence, development, therapeutic effect and drug resistance of MM.