First report of Lasiodipilodia theobromae Causing leaf spot of Agave sisalana in GuangXi, China.

Agave sisalana, as an excellent fiber producing plant, is mainly planted in Guangxi Province, China. In November 2023, a foliar disease occured on A. sisalana at Liangjiang Town (108.3593 W, 23.4723 N), Wuming District, Nanning in GuangXi, China. Approximately 50 to 60% of the plants (n=200) had obvious leaf spots on more than 70% of the leaves. On the leaves of sisal, circular or irregularly shaped yellow brown spots can be seen, sunken, with no halo on the edges. As time goes on, the lesion gradually expands to the entire blade of the sword (Figure 1A, 1B). To identify the disease etiology, ten agave leaves were collected from GuangXi. Symptomatic midribs were cut into 3×3 mm pieces, surface sterilized with 75 % ethanol for 20 s, rinsed with sterilized distilled water three times, air dried on sterile filter paper, plated on photo dextrose agar (PDA) medium, and incubated at 28 ℃ in the dark. Five isolates (JM01, JM02, JM03, JM05, JM06) with similar morphology were obtained. Colonies on PDA medium were white to grayish-white with atrial mycelia growing initially upward and then forming clusters (Figure 1E). After five days, mycelia turned grayish black. Immature conidia were initially hyaline, aseptate, and ellipsoid. Mature conidia were dark brown, one septate, longitudinal striate, and 22.1 to 26.3×10.2 to 14.9 µm (Figure 1F). Morphologically , the isolates were identified as Lasiodiplodia theobromae (Alves et al. 2008). For molecular identification, genome DNA of five representative isolate was extracted using the Fungi Genomic DNA Purification kit. The internal transcribed spacer (ITS) region of rDNA and translation elongation factor 1-alpha (TEF-1α) and ß-tublin (TUB) gene were amplified with primer pairs ITS1/ITS4 (White et al. 1990), EF1-728F/EF1-986R (Carbone and Kohn 1999), and Bt2a/Bt2b (Glass and Donaldson 1995), respectively, and sequenced. The ITS (PP209594), TEF-1α (PP234629), and TUB (PP234628) sequences of representative isolate JM01 were deposited in GeneBank. BLAST searches showed >99% nucleotide identity to sequences of L. theobromae (ITS, 99.26% to NR111174; TEF-1α, 99.69% to MM840490; TUB, 98.92% to MN172230). Phylogenetic analysis using maximum likelihood based on the combined ITS, TEF-1α, and TUB sequences of the isolates and reference sequences of Lasiodiplodias spp. from GenBank indicated the isolates obtained in this study formed a clade strongly supported based on bootstrap values to the ex-type isolate CBS164.96 sequences of L.theobromae (Figure 2). To test pathogenicity, JM01 was tested by inoculation leaves of one year old agave plants, the epidermis at the inoculation site, 10, 15 and 20 cm below to the crown, was wiped with a 75% alcohol cotton ball, washed three times with sterile water, and punctured (5 mm diameter) with a sterile inoculation needle. A 5 mm block of each isolate cultured on PDA for 3 days was attached to the inoculation site. Controls were inoculated with sterile PDA. The inoculation area was covered with plastic wrap. All plants were kept in a controlled greenhouse at 27℃, 80% relative humidity, and natural daylight, and watered weekly. Each treatment was repeated three times. Remove the block one day later. Three days after inoculation, all inoculated had typical symptoms,but control were healthy (Figure 1C, 1D). Fungal isolates were only recovered from symptomatic stems and were morphologically identical to L. theobromae, completing Koch's postulates. L. Theobromae has been reported as the cause of leaf rot on A. angustifolia in Mexico (Reyes-García et al. 2023). To our knowledge, this is the first report of L. theobromae causing leaf spot on A. sisalana in GuangXi, China. L. theobromae is primarily a plant pathogen that causes rotting and dieback in fruits and plants in tropical and subtropical regions (Puttanna 1967). This study is useful to focus on management strategies for leaf rot disease by L. theobromae of A. sisalana.

From cis-Lobeline to trans-Lobeline: Study on the Pharmacodynamics and Isomerization Factors.

Lobeline is an alkaloid derived from the leaves of an Indian tobacco plant (Lobelia inflata), which has been prepared by chemical synthesis. It is classified as a partial nicotinic agonist and has a long history of therapeutic usage ranging from emetic and respiratory stimulant to tobacco smoking cessation agent. The presence of both cis and trans isomers in lobeline is well known, and many studies on the relationship between the structure and pharmacological activity of lobeline and its analogs have been reported. However, it is a remarkable fact that no studies have reported the differences in pharmacological activities between the two isomers. In this article, we found that different degrees of isomerization of lobeline injection have significant differences in respiratory excitatory effects in pentobarbital sodium anesthetized rats. Compared with cis-lobeline injections, the respiratory excitatory effect was significantly reduced by 50.2% after administration of injections which contained 36.9% trans-lobeline. The study on the influencing factors of isomerization between two isomers shown that this isomerization was a one-way isomerism and only converted from cis to trans, where temperature was the catalytic factor and pH was the key factor. This study reports a new discovery. Despite the widespread use of ventilators, first-aid medicines such as nikethamide and lobeline has retired to second line, but as a nonselective antagonist with high affinity for a4b2 and a3b2 nicotinic acetylcholine receptors (nAChRs). In recent years, lobeline has shown great promise as a therapeutic drug for mental addiction and nervous system disorders, such as depression, Alzheimer disease and Parkinson disease. Therefore, we suggest that the differences between two isomers should be concerned in subsequent research papers and applications.

[Molecular mechanism of Fagopyri Dibotryis Rhizoma in treatment of acute lung injury based on network pharmacology and in vitro experiments].

The present study explored the mechanism of Fagopyri Dibotryis Rhizoma(FDR) and its main active components in the treatment of acute lung injury(ALI) based on the network pharmacology and the in vitro experiments. The main active components of FDR were obtained from the TCMSP database and screened by oral bioavailability and drug-likeness. The related target proteins of FDR were retrieved from the PubChem database, and the target genes related to ALI were screened out from the GeneCards database. A protein-protein interaction(PPI) network of compound target proteins and ALI target genes was constructed using STRING 11.0. Ingenuity Pathway Analysis(IPA) platform was used to analyze the common pathways of the potential compound target proteins of FDR and ALI target genes, thereby predicting the key targets and potential signaling pathways of FDR for the treatment of ALI. Finally, the potential pathways and key targets were verified by the in vitro experiments of lipopolysaccharide-induced RAW264.7 cells intervened by epicatechin(EC), the active component of FDR. The results of network pharmacology showed that 15 potential active components such as EC, procyanidin B1, and luteolin presumedly functioned in the treatment of ALI through nuclear transcription factor-κB(NF-κB) signaling pathway, transforming growth factor-ß(TGF-ß) signaling pathway, and adenosine 5'-monophosphate(AMP)-activated protein kinase(AMPK) signaling pathway through key targets, such as RELA(P65). The results of in vitro experiments showed that 25 µmol·L~(-1) EC had no toxicity to cells and could inhibit the expression of the p65-phosphorylated protein in the NF-κB signaling pathway to down-regulate the expression of downstream inflammatory cytokines, including tumor necrosis factor-α(TNF-α), IL-1ß and nitric oxide(NO), and up-regulate the expression of IL-10. These results suggested that the therapeutic efficacy of FDR on ALI was achieved by inhibiting the phosphorylation of p65 protein in the NF-κB signaling pathway and down-regulating the level of proinflammatory cytokines downstream of the signaling pathways.

[Effect of ginsenoside total saponinon on regulation of P450 of livers of rats after γ-ray irradiation].

Effect of ginsenoside total saponin (GTS) on the regulation of P450 of livers of rats after γ-ray irradiation was studied. Rats were irradiated by the 6°Coγ-ray for one-time dose of 5.5 Gy, dose rate of 117.1-119.2 cGy. The cocktail probe, qPCR and Western blot were used to detect expression of enzymatic activites, mRNA and protein of rats. Contrasted with blank group, expression of CYP1A2, 2B1, 2E1, 3A4 of irradiation group showed a up-regulated (P < 0.05). Contrasted with irradiation group, exprression of CYP1A2, 2B1, 2E1, 3A4 of GTS group showed a downward trend. GTS had negative agonistic action against expression of P450 of rats by irradiatied.

[Effect of paeoniflorin on level of glucocorticoid receptor of peripheral blood monocytes in rats of collagen-induced arthritis].

The study is to explore the effect of paeoniflorin on the level of glucocorticoid receptor, including glucocorticoid receptor-alpha (GCRalpha) and glucocorticoid receptor-beta (GCRbeta), of peripheral blood mononuclear cells (PBMCs) in rats of collagen-induced arthritis (CIA). CIA is induced in Wistar rats by an intradermal injection of bovine type II collagen emulsified with complete adjuvant. From the 14th day after primary immunization, the CIA rats were intragastrically administered paeoniflorin 25, 50 and 100 mg x kg(-1) or triptolde 20 microg x kg(-1) or paeoniflorin 50 mg x kg(-1) + RU486 15 mg x kg(-1), once a day, for 28 consecutive days. After administration, apart from PF + RU486 group all experimental rats were took blood by removalling eyeball, then separated PBMCs. The level of GCRalpha, GCRbeta in PBMCs were examined by ELISA, and the mRNA expression of GCRalpha, GCRbeta was detected by RT-PCR. All rats were sacrificed and took the joint with no immunization. The expression of IL-1beta, NF-kappaB p65, TNF-alpha, PGE2 of synovial tissue was detected by immunohistochemistry. Paeoniflorin was able to inhibit the expression of IL-1beta, NF-kappaB p65, TNF-alpha, PGE2 of synovial tissue in CIA rats. While RU486, glucocorticoid receptor's blocker, could weaken the fuction of paeoniflorin. Meanwhile, paeoniflorin obviously induced the expression of GCRalpha and GCRalpha mRNA, while obviously inhibited the expression of GCRbeta and GCRbeta mRNA. These results indicat paeoniflorine suppresses inflammatory mediator production may be relating with it regulating GCR in PBMCs of CIA rats.

Establishment and Characterization of a New Intrahepatic Cholangiocarcinoma Cell Line, ICC-X2.

Background: Intrahepatic cholangiocarcinoma (ICC) is an aggressive malignant tumor of the biliary tract that is prone to recurrence and metastasis and is characterized by poor sensitivity to chemotherapy and overall prognosis. For these reasons, there is an urgent need to understand its pathological mechanisms and develop effective treatments. To address this challenge, the establishment of suitable preclinical models is critical. Methods: Fresh ICC tissue samples were used for primary culture and subculture. The cell line was evaluated by cell proliferation assays, clonal formation assays, karyotype analysis, and short tandem repeat (STR) analysis. Drug resistances against oxaliplatin, paclitaxel, gemcitabine and 5-fluorouracil (5-FU) were evaluated by CCK-8 assay. Subcutaneous injection of 1 × 106 cells to three BALB/c nude mice was conducted for xenograft studies. The hematoxylin and eosin (H&E) staining was used to detect the pathological status of the cell line. The expression of biomarkers CK7, CK19, Ki-67, E-cadherin and vimentin was determined by immunocytochemistry assay. Results: A new ICC cell line named ICC-X2 was successfully established. Like ICC-X3 established using the same patient's metastatic tumor, the cell line has been continuously cultured in vitro for more than a year and has been passaged more than 100 times. ICC-X2 retained the typical biliary epithelial morphology. The population doubling time of ICC-X2 is 48 h. The cells demonstrated an abnormal nearly tetraploid karyotype. The STR analysis confirmed that ICC-X2 was highly consistent with the primary tumor tissue and not cross-contaminated by existing cell lines. ICC-X2 cells positively expressed CK7, CK19, E-cadherin, and vimentin, and the positive expression of Ki-67 in ICC-X2 cells was 40%. The ICC-X2 cells exhibited a strong clonogenic ability. The drug sensitivity test indicated that ICC-X2 was sensitive to oxaliplatin and paclitaxel, but naturally resistant to gemcitabine and 5-FU. ICC-X2 was rapidly able to form transplanted tumors in vivo after subcutaneous inoculation in nude mice. Conclusions: ICC-X2 is an excellent experimental model that can be used for studying the occurrence, development, and metastasis of ICC and investigating the mechanism of tumor drug resistance.

[Effect of Siwu decoction and its combined administration on hepatic P450 enzymatic activity and mRNA expression in rats].

To study the effect of Siwu decoction (SWD) compound and its combined administration on hepatic P450 enzymatic activity and mRNA expression in rats. Rats were orally administered with SWD and water decoction combined with other medicines for two weeks, and then sacrificed. Their livers were perfused with normal saline to prepare liver micrisomes. Mixed probe and liver microsome in vitro incubation method were adopted to detect the effect of SWD on hepatic cytochrome P450. The real-time quantitative polymerase chain reaction (Q-PCR) was used to detect the effect of SWD on the expression of hepatic cytochrome P450. Compared with the control group, the SWD compound group showed higher CYP1A2 enzymatic activity (P < 0.05); Rehmanniae-paeoniae, angelicae-paeoniae, angelicae-rhizome, paeoniae-rhizome groups had lower CYP1A2 and CYP2C19 enzymatic activities (P < 0.05); And the compound group, the single component group and the combination group showed lower CYP2B6 enzymatic activities (P < 0.05). The compound could up-regulated the mRNA expression of CYP2B1 (P < 0.05); And the four single components could down-regulated the mRNA expression of CYP2B1 (P < 0.05). SWD compound had the effect in inducing CYP1A2 enzymatic activity. The rehmanniae-paeoniae group and the angelicae-paeoniae group had identical enzymatic activity with the control group, but significant down-regulation in CYP1A2 enzymatic activity after being combined with paeoniae. The compound and its combined administration showed the inhibitory effect on CYP2B6 enzymatic activity, particularly being combined with angelicae. The compound showed identical effect with the four single components in terms of CYP1A2 mRNA expression and enzymatic activity.

MicroRNA-219 alleviates glutamate-induced neurotoxicity in cultured hippocampal neurons by targeting calmodulin-dependent protein kinase II gamma.

Septic encephalopathy is a frequent complication of sepsis, but there are few studies examining the role of microRNAs (miRs) in its pathogenesis. In this study, a miR-219 mimic was transfected into rat hippocampal neurons to model miR-219 overexpression. A protective effect of miR-219 was observed for glutamate-induced neurotoxicity of rat hippocampal neurons, and an underlying mechanism involving calmodulin-dependent protein kinase II γ (CaMKIIγ) was demonstrated. miR-219 and CaMKIIγ mRNA expression induced by glutamate in hippocampal neurons was determined by quantitative real-time reverse transcription-polymerase chain reaction (qRT-PCR). After neurons were transfected with miR-219 mimic, effects on cell viability and apoptosis were measured by 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide (MTT) assay and flow cytometry. In addition, a luciferase reporter gene system was used to confirm CaMKIIγ as a target gene of miR-219. Western blot assay and rescue experiments were also utilized to detect CaMKIIγ expression and further verify that miR-219 in hippocampal neurons exerted its effect through regulation of CaMKIIγ. MTT assay and qRT-PCR results revealed obvious decreases in cell viability and miR-219 expression after glutamate stimulation, while CaMKIIγ mRNA expression was increased. MTT, flow cytometry, and caspase-3 activity assays showed that miR-219 overexpression could elevate glutamate-induced cell viability, and reduce cell apoptosis and caspase-3 activity. Moreover, luciferase CaMKIIγ-reporter activity was remarkably decreased by co-transfection with miR-219 mimic, and the results of a rescue experiment showed that CaMKIIγ overexpression could reverse the biological effects of miR-219. Collectively, these findings verify that miR-219 expression was decreased in glutamate-induced neurons, CaMKIIγ was a target gene of miR-219, and miR-219 alleviated glutamate-induced neuronal excitotoxicity by negatively controlling CaMKIIγ expression.

Mn-SOD and CuZn-SOD polymorphisms and interactions with risk factors in gastric cancer.

AIM: To investigate the effects of superoxide dismutase (SOD) polymorphisms (rs4998557, rs4880), Helicobacter pylori (H. pylori) infection and environmental factors in gastric cancer (GC) and malignant potential of gastric precancerous lesions (GPL). METHODS: Copper-zinc superoxide dismutase (SOD1, CuZn-SOD)-G7958A (rs4998557) and manganese superoxide dismutase (SOD2, Mn-SOD)-Val16Ala (rs4880) polymorphisms were genotyped by SNaPshot multiplex polymerase chain reaction (PCR) in 145 patients with GPL (87 cases of gastric ulcer, 33 cases of gastric polyps and 25 cases of atrophic gastritis), 140 patients with GC and 147 healthy controls. H. pylori infection was detected by immunoblotting analysis. RESULTS: The SOD1-7958A allele was associated with a higher risk of gastric cancer [odds ratio (OR) = 3.01, 95% confidence intervals (95% CI): 1.83-4.95]. SOD2-16Ala/Val genotype was a risk factor for malignant potential of GPL (OR = 2.04, 95% CI: 1.19-3.49). SOD2-16Ala/- genotype increased the risk of gastric cancer (OR = 2.85, 95% CI: 1.66-4.89). SOD1-7958A/- genotype, SOD2-16Ala/- genotype, alcohol drinking, positive family history and type I H. pylori infection were associated with risk of gastric cancer, and there were additive interactions between the two genotypes and the other three risk factors. SOD2-16Ala/Val genotype and positive family history were associated with malignant potential of GPL and jointly contributed to a higher risk for malignant potential of GPL (OR = 7.71, 95% CI: 2.10-28.22). SOD1-7958A/- genotype and SOD2-16Ala/- genotype jointly contributed to a higher risk for gastric cancer (OR = 6.43, 95% CI: 3.20-12.91). CONCLUSION: SOD1-7958A/- and SOD2-16Ala/-genotypes increase the risk of gastric cancer in Chinese Han population. SOD2-16Ala/-genotype is associated with malignant potential of GPL.

Antitumor effect of matrine in human hepatoma G2 cells by inducing apoptosis and autophagy.

AIM: To study the antitumor effect of matrine in human hepatoma G2 (HepG2) cells and its molecular mechanism involved in antineoplastic activities. METHODS: 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay was used to detect viability of HepG2 cells. The effect of matrine on cell cycle was detected by fl ow cytometry. Annexin-V-FITC/PI double staining assay was used to detect cellular apoptosis. Cellular morphological changes were observed under an inverted phase contrast microscope. Transmission electron microscopy was performed to further examine ultrastructural structure of the cells treated with matrine. Monodansylcadaverine (MDC) staining was used to detect autophagy. Whether autophagy is blocked by 3-methyladenine (3-MA), an autophagy inhibitor, was evaluated. Expression levels of Bax and Beclin 1 in HepG2 cells were measured by real-time quantitative reverse transcription-polymerase chain reaction (RT-PCR). RESULTS: Matrine significantly inhibited the proliferation of HepG2 cells in a dose- and time-dependent manner, and induced G1-phase cell cycle arrest and apoptosis of HepG2 cells in a dose-dependent manner. The total apoptosis rate was 0.14% for HepG2 cells not treated with matrine. In contrast, the apoptosis rate was 28.91%, 34.36% and 38.80%, respectively, for HepG2 cells treated with matrine at the concentration of 0.5, 1.0 and 2.0 mg/mL. The remarkable morphological changes were observed under an inverted phase contrast microscope. Abundant cytoplasmic vacuoles with varying sizes were observed in HepG2 cells treated with matrine. Furthermore, vacuolization in cytoplasm progressively became larger and denser when the concentration of matrine was increased. Electron microscopy demonstrated formation of abundant autophagic vacuoles in HepG2 cells after matrine treatment. When the specific autophagic inhibitor, 3-MA, was applied, the number of autophagic vacuoles greatly decreased. MDC staining showed that the fluorescent density was higher and the number of MDC-labeled particles in HepG2 cells was greater in matrine treatment group than in control group. Fewer autophagic vacuoles were observed in the combined 3-MA and matrine treatment group when 3-MA was added before matrine treatment, indicating that both autophagy and apoptosis are activated when matrine-induced death of hepatoma G2 cells occurs. Real-time quantitative RT-PCR revealed that the expression levels of Bax gene, an apoptosis-related molecule, and Beclin 1 gene which plays a key role in autophagy were higher in matrine treatment group than in control group, indicating that Beclin 1 is involved in matrine-induced autophagy and the pro-apoptotic mechanism of matrine may be related to its upregulation of Bax expression. CONCLUSION: Matrine has potent antitumor activities in HepG2 cells and may be used as a novel effective reagent in treatment of hepatocellular carcinoma.