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1.
World J Mens Health ; 2024 Aug 14.
Artigo em Inglês | MEDLINE | ID: mdl-39344111

RESUMO

PURPOSE: To examine the role and mechanism of thrombospondin-1 (TSP1) in the development of fibrosis in diabetes mellitus-induced erectile dysfunction (DMED). MATERIALS AND METHODS: DMED was induced by intraperitoneal streptozotocin injection. All rats were categorized into three groups: control group (n=8), DMED group (n=8) and DMED+Leu-Ser-Lys-Leu (LSKL) group (n=8). After eight weeks following the induction of diabetes mellitus, the DMED+LSKL group was subjected to intraperitoneal injections of LSKL twice weekly for four weeks. To measure intracavernous pressure (ICP), a 25-gauge needle connected to a PE tube containing heparin was inserted into the corpus cavernosum (CC). Additionally, a needle was inserted into the carotid artery to measure mean arterial pressure (MAP). Sirius red staining and Masson trichrome staining were utilized to assess CC fibrosis. Moreover, high glucose (HG)-induced CC smooth muscle cells (CCSMCs) and CC fibroblasts (CCFs) were treated with or without LSKL. Western blotting and immunofluorescence were utilized to assess the phosphorylation and expression of related proteins. RESULTS: Compared with those in the control group, the ratio of the maximum ICP to the MAP markedly decreased in the DMED group, as did the ratio of smooth muscle to collagen and the ratio of collagen I to collagen III. These ratios were greater in the DMED+LSKL group than in the DMED group. TSP1 was highly expressed in the CC of DMED rats. In vitro experiments indicated that TSP1 expression significantly increased in the medium of CCSMCs and CCFs cultured in HG media and that the TGF-ß pathway was activated in CCSMCs. Collagen IV was overexpressed in CCSMCs, indicating severe fibrosis was severe. Adding LSKL or knocking TSP1 down can prevent the activation of TGF-ß signaling, as well as the overexpression of collagen IV in CCSMCs promoted by TSP1 secreted from CCSMCs itself or CCFs. CONCLUSIONS: TSP1 expression is increased in the CC of DMED rats. HG-induced TSP1 secretion via autocrine signaling from CCSMCs and/or paracrine signaling from CCFs to accelerate penile fibrosis. LSKL, an antagonist of TSP1, could improve erectile dysfunction by inhibiting the TGF-ß/SMAD pathway.

2.
Microbiol Spectr ; 12(10): e0381223, 2024 Oct 03.
Artigo em Inglês | MEDLINE | ID: mdl-39189758

RESUMO

The widespread prevalence of saline environments poses a significant global environmental challenge. Salt stress, induced by saline soils, disrupts soil microecology and affects the plant-microbe-soil cycling process. Utilizing microbial fungicides stands as a primary strategy to mitigate salt stress-induced damage to plants and soils. This study investigated the influence of Bacillus subtilis (Bs) inoculation on the microbial community, assembly processes, and functional changes in bacteria and fungi in Glycyrrhiza uralensis Fisch. (licorice) seedlings under varying salt stress levels, primarily employing microbiomics techniques. Soil enzyme activities displayed a declining trend with increasing salt stress, which was mitigated by Bs inoculation. Microbiome analysis revealed a significant increase in bacterial and fungal operational taxonomic units, particularly in Ascomycetes and Nitrogen-fixing Bacteria, thereby enhancing soil denitrification. The abundance of Proteobacteria, Actinobacteriota, Bacteroidota, and Firmicutes in bacteria, as well as Ascomycota in fungi, increased with higher salt stress levels, a process facilitated by Bs inoculation. However, functional predictions indicated a reduction in the relative abundance of Dung Saprotrophs with Bs inoculation. Salt stress disrupted soil assembly processes, showcasing a continuous decline in diffusion limitation with increased salt concentration, where Bs inoculation reached a peak under moderate stress. In summary, this research elucidates the communication mechanism of Bs in enhancing salt tolerance in licorice from a microbiome perspective, contributing to a comprehensive understanding of abiotic and biotic factors.IMPORTANCELicorice is a herb that grows in deserts or saline soils. Enhancing the salt tolerance of licorice is necessary to maintain the quality of cultivated licorice and to ensure the supply of medicinal herbs. In the past, we have demonstrated the effectiveness of inoculation with Bacillus subtilis (Bs) to enhance the salt tolerance of licorice and revealed the key metabolic pathways for the development of salt tolerance through multi-omics. In this study, we used the microbiomics approach to reveal the plant-microbe-soil interactions at the level of inoculation of Bs affecting the dynamics of soil microbial communities from bacterial and fungal perspectives, thus bridging the interactions between biotic and abiotic factors.


Assuntos
Bacillus subtilis , Bactérias , Glycyrrhiza uralensis , Microbiota , Tolerância ao Sal , Microbiologia do Solo , Bacillus subtilis/fisiologia , Bacillus subtilis/metabolismo , Bacillus subtilis/genética , Glycyrrhiza uralensis/microbiologia , Microbiota/fisiologia , Bactérias/genética , Bactérias/classificação , Bactérias/metabolismo , Bactérias/isolamento & purificação , Fungos/genética , Fungos/metabolismo , Fungos/classificação , Fungos/fisiologia , Solo/química , Rizosfera , Estresse Salino , Plântula/microbiologia
3.
Front Genet ; 15: 1442277, 2024.
Artigo em Inglês | MEDLINE | ID: mdl-39130754

RESUMO

Introduction: Research on Glycyrrhiza uralensis, a nonhalophyte that thrives in saline-alkaline soil and a traditional Chinese medicinal component, is focused on improving its ability to tolerate salt stress to increase its productivity and preserve its "Dao-di" characteristics. Furthermore, the inoculation of bioagents such as Bacillus subtilis to increase plant responses to abiotic stressors is currently a mainstream strategy. Mitogen-activated protein kinase (MAPK), a highly conserved protein kinase, plays a significant role in plant responses to various abiotic stress pathways. Methods: This investigation involved the identification of 21 members of the GuMAPK family from the genome of G. uralensis, with an analysis of their protein conserved domains, gene structures, evolutionary relationships, and phosphorylation sites using bioinformatics tools. Results: Systematic evolutionary analysis of the 21 GuMAPKs classified them into four distinct subgroups, revealing significant differences in gene structure and exon numbers. Collinearity analysis highlighted the crucial role of segmental duplication in expanding the GuMAPK gene family, which is particularly evident in G. uralensis and shows a close phylogenetic relationship with Arabidopsis thaliana, tomato, and cucumber. Additionally, the identification of phosphorylation sites suggests a strong correlation between GuMAPK and various physiological processes, including hormonal responses, stress resistance, and growth and development. Protein interaction analysis further supported the role of GuMAPK proteins in regulating essential downstream genes. Through examination of transcriptome expression patterns, GuMAPK16-2 emerged as a prospective pivotal regulatory factor in the context of salt stress and B. subtilis inoculation, a finding supported by its subcellular localization within the nucleus. Discussion: These discoveries offer compelling evidence for the involvement of GuMAPK in the salt stress response and for the exploration of the mechanisms underlying B. subtilis' enhancement of salt tolerance in G. uralensis.

4.
J Am Chem Soc ; 146(1): 723-732, 2024 Jan 10.
Artigo em Inglês | MEDLINE | ID: mdl-38116993

RESUMO

Despite the current progress achieved in asymmetric hydroacylations, highly enantioselective catalytic addition of unfunctionalized aldehydes to internal alkenes remains an unsolved challenge. Here, using a coordination-assisted strategy, we developed a rhodium-catalyzed regio- and enantioselective addition of unfunctionalized aldehydes to internal alkenes such as enamides and ß,γ-unsaturated amides. Valuable α-amino ketones and 1,4-dicarbonyl compounds were directly obtained with high enantioselectivity from readily available materials.

5.
Zhongguo Zhong Yao Za Zhi ; 48(11): 2919-2924, 2023 Jun.
Artigo em Chinês | MEDLINE | ID: mdl-37381951

RESUMO

Zearalenone(ZEN) is a toxic metabolite produced by Fusarium culmorum, F. graminearum, F. tricinctum, and other fungi, with estrogenic characteristics. Exposure to or ingestion of ZEN during pregnancy can cause reproductive dysfunction, miscarriage, stillbirth, and malformation, and seriously endanger human life and health. The detection methods for ZEN in the Chinese Pharmacopoeia(2020 edition) are liquid chromatography(LC) and liquid chromatography-mass spectrometry(LC-MS), and it is stipulated that ZEN should not exceed 500 µg in 1 000 g of Coicis Semen. Although these detection methods by instruments can achieve the qualitative and quantitative analysis of ZEN in Coicis Semen, their high detection cost and long periods hinder the rapid screening of a large number of samples in the field. In this study, the synthesized ZEN hapten was conjugated with bovine serum albumin(BSA) and ovalbumin(OVA) to obtain the complete ZEN antigen. By virtue of antibody preparation techniques, ZEN monoclonal antibody 4F6 was prepared, which showed 177.5%, 137.1%, and 109.7% cross-reactivity with ZEN structural analogs zearalanol, zearalenone, and α-zearalenol, respectively, and no cross-reactivity with other fungal toxins such as aflatoxin. Direct competitive enzyme-linked immunosorbent assay(dcELISA) based on ZEN monoclonal antibody 4F6 was developed for the determination of ZEN in Coicis Semen with an IC_(50) of 1.3 µg·L~(-1) and a detection range of 0.22-21.92 µg·L~(-1). The recoveries were 83.91%-105.3% and the RSD was 4.4%-8.0%. The established dcELISA method was used to determine the ZEN residuals in nine batches of Coicis Semen samples, and the results were validated by LC-MS. The correlation between the two detection methods was found to be 0.993 9, indicating that the established dcELISA could be used for the rapid qualitative and quantitative detection of ZEN residuals in Coicis Semen.


Assuntos
Coix , Micotoxinas , Zearalenona , Humanos , Feminino , Gravidez , Ensaio de Imunoadsorção Enzimática , Anticorpos Monoclonais
6.
Angew Chem Int Ed Engl ; 61(26): e202200075, 2022 06 27.
Artigo em Inglês | MEDLINE | ID: mdl-35460133

RESUMO

Preparation of skipped dienes with a quaternary carbon center at the C-3 position remains a synthetic challenge. We report here an iridium-catalyzed formal addition of tertiary sp3 C-H bond to alkyne for the facile preparation of skipped dienes. The tertiary allylic C-H bond is cleaved regioselectively, at the site of which a new C-C bond is formed. Enantioselective construction of acyclic quaternary carbon stereocenters is also demonstrated.


Assuntos
Alcinos , Irídio , Carbono/química , Catálise , Irídio/química , Estrutura Molecular , Polienos , Estereoisomerismo
7.
Org Lett ; 23(24): 9500-9504, 2021 12 17.
Artigo em Inglês | MEDLINE | ID: mdl-34860536

RESUMO

We report here an iridium-catalyzed hydroalkynylation of allylic alcohols protected by an oxime group. Catalytic alkynylation occurs exclusively at the distal position of the alkene. This method generates γ-alkynyl alcohol oximes directly from internal alkenes and terminal alkynes. The oxime group can be readily removed to afford a free alcohol, thus providing an indirect route for the catalytic hydroalkynylation of allylic alcohols.

8.
Nat Commun ; 12(1): 3776, 2021 06 18.
Artigo em Inglês | MEDLINE | ID: mdl-34145273

RESUMO

Chiral tertiary boronic esters are important precursors to bioactive compounds and versatile synthetic intermediates to molecules containing quaternary stereocenters. The development of conjugate boryl addition to α,ß-unsaturated amide has been hampered by the intrinsic low electrophilicity of the amide group. Here we show the catalytic asymmetric synthesis of enantioenriched tertiary boronic esters through hydroboration of ß,ß-disubstituted α,ß-unsaturated amides. The Rh-catalyzed hydroboration occurs with previously unattainable selectivity to provide tertiary boronic esters in high enantioselectivity. This strategy opens a door for the hydroboration of inert Michael acceptors with high stereocontrol and may provide future applications in the synthesis of biologically active molecules.

9.
Chem Sci ; 12(10): 3751-3767, 2021 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-34163649

RESUMO

Chiral, cationic NHC-iridium complexes are introduced as catalysts for the intramolecular hydroamination reaction of unactivated aminoalkenes. The catalysts show high activity in the construction of a range of 5- and 6-membered N-heterocycles, which are accessed in excellent optical purity, with various functional groups being tolerated with this system. A major deactivation pathway is presented and eliminated by using alternative reaction conditions. A detailed experimental and computational study on the reaction mechanism is performed providing valuable insights into the mode of action of the catalytic system and pointing to future modifications to be made for this catalytic platform.

10.
J Org Chem ; 83(17): 9741-9755, 2018 Sep 07.
Artigo em Inglês | MEDLINE | ID: mdl-30080044

RESUMO

A novel chiral disulfoxide ligand pair bearing fluorine atoms at the 6 and 6' position of its atropisomeric backbone, ( M, S, S)- and ( P, S, S)- p-Tol-6F-BIPHESO, was synthesized. Complexation to a rhodium(I) precursor gave rise to µ-Cl- and µ-OH-bridged rhodium dimer complexes incorporating the new ( M, S, S)- p-Tol-6F-BIPHESO ligand, while its sibling ( P, S, S)- p-Tol-6F-BIPHESO was not complexed efficiently to the rhodium precursor. The performance of this disulfoxide ligand [( M, S, S)- p-Tol-6F-BIPHESO] in catalysis was tested in both 1,4- and 1,2-addition reactions of arylboronic acids. We show that addition to both cyclic and acyclic enones as well as N-tosylarylimines proceeds with high yields and high enantioselectivities to give the corresponding products. The synthesis of enantiomerically pure p-Tol-6F-BIPHESO is straightforward and inexpensive which, together with the high catalytic performance and wide substrate scope for these addition reactions, makes it a very attractive alternative to more classical chiral ligand entities.

11.
Eur J Med Chem ; 93: 109-20, 2015 Mar 26.
Artigo em Inglês | MEDLINE | ID: mdl-25666911

RESUMO

A number of novel 2-(N-(2-(5,5-dimethyl-1,3-dioxane-2-yl)ethyl)aminoacyl)amino-2-deoxy- d-glucopyranoside were synthesized from a readily available starting material, glucosamine, 2,2-dimethyl-1,3-propanediol and 1,1,3,3-tetramethoxypropane, and evaluated for their anti-inflammatory activity. Our results showed that all of the compounds tested exhibited a significant inhibition of xylene-induced inflammation in mice.


Assuntos
Anti-Inflamatórios/síntese química , Dioxanos/química , Desenho de Fármacos , Glucosamina/química , Peptidomiméticos/síntese química , Animais , Anti-Inflamatórios/química , Anti-Inflamatórios/farmacologia , Anti-Inflamatórios/uso terapêutico , Edema/tratamento farmacológico , Masculino , Camundongos , Camundongos Endogâmicos ICR , Estrutura Molecular , Peptidomiméticos/química , Peptidomiméticos/farmacologia , Peptidomiméticos/uso terapêutico
12.
Bioorg Med Chem Lett ; 24(22): 5274-8, 2014 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-25304898

RESUMO

In this study, several novel coumarin derivatives, 7-hydroxy-2-oxo-2H-chromene-3-carboxyl-Trp-Trp-AA-OBzl compounds, were designed and synthesized as potential anticancer agents. Their in vitro cytotoxic activities were evaluated using methylthiazoltetrazolium (MTT) assay. The anti-tumor activity of the newly coumarin derivatives was determined in a S180 bearing mouse model and some of the compounds demonstrated tumor growth inhibition similar to the positive control, doxorubicin. Compared to doxorubicin, most of the compounds exhibited enhanced immunologic function suggesting a relatively minor toxic effect. The intercalation of the coumarin derivatives synthesized with calf thymus (CT) DNA was also studied.


Assuntos
Antineoplásicos/síntese química , Cumarínicos/química , Animais , Antineoplásicos/farmacologia , Antineoplásicos/uso terapêutico , Bovinos , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Dicroísmo Circular , Cumarínicos/farmacologia , Cumarínicos/uso terapêutico , DNA/química , DNA/metabolismo , Doxorrubicina/química , Doxorrubicina/farmacologia , Doxorrubicina/uso terapêutico , Humanos , Camundongos , Neoplasias/tratamento farmacológico , Transplante Heterólogo
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