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1.
Prev Med Rep ; 44: 102798, 2024 Aug.
Article in English | MEDLINE | ID: mdl-38983448

ABSTRACT

Background: Non-alcoholic fatty liver disease (NAFLD), a chronic liver condition of increasing prevalence, is closely related to various metabolic disorders. Hemoglobin, a protein that transports oxygen in red blood cells, is the focus of this study, which seeks to investigate its potential association with NAFLD. Methods: We selected 6,516 eligible adult participants from the United States using the 2017-2020 National Health and Nutrition Examination Survey database for cross-sectional analyses. We analyzed the association of hemoglobin with NAFLD using weighted logistic regression models. Results: The study performed a weighted logistic regression modeling analysis, which verified that hemoglobin levels were positively associated with NAFLD, especially in the higher hemoglobin quartile groups. Subgroup analyses revealed no significant interactions, demonstrating the robustness of the model. The analysis of mediation effects showed that Gamma-Glutamyl Transferase, Alanine Aminotransferase, and triglycerides were important mediating variables in the relationship between hemoglobin and NAFLD. Conclusion: Increased hemoglobin levels were found to be significantly and independently associated with an increased NAFLD risk. This insight is crucial for the risk assessment and early detection of NAFLD, underscoring the need for heightened vigilance in individuals with higher hemoglobin levels.

2.
Front Microbiol ; 15: 1429692, 2024.
Article in English | MEDLINE | ID: mdl-38983634

ABSTRACT

Introduction: Chlorhexidine (CHX) is a commonly used antiseptic in situations of limited oral hygiene ability such as after periodontal surgery. However, CHX is also considered as a possible factor in the emergence of cross-resistance to antibiotics. The aim of this study was to analyze the changes in the oral microbiota and the prevalence of antimicrobial resistance genes (ARGs) due to CHX treatment. Materials and methods: We analyzed the oral metagenome of 20 patients who applied a 0.2% CHX mouthwash twice daily for 4 weeks following periodontal surgical procedures. Saliva and supragingival plaque samples were examined before, directly after 4 weeks, and another 4 weeks after discontinuing the CHX treatment. Results: Alpha-diversity decreased significantly with CHX use. The Bray-Curtis dissimilarity increased in both sample sites and mainly streptococci showed a higher relative abundance after CHX treatment. Although no significant changes of ARGs could be detected, an increase in prevalence was found for genes that encode for tetracycline efflux pumps. Conclusion: CHX treatment appears to promote a caries-associated bacterial community and the emergence of tetracycline resistance genes. Future research should focus on CHX-related changes in the microbial community and whether the discovered tetracycline resistance genes promote resistance to CHX.

3.
Comput Struct Biotechnol J ; 23: 2565-2579, 2024 Dec.
Article in English | MEDLINE | ID: mdl-38983650

ABSTRACT

Cervical cancer remains a significant global public health concern, often exhibits cisplatin resistance in clinical settings. Hypoxia, a characteristic of cervical cancer, substantially contributes to cisplatin resistance. To evaluate the therapeutic efficacy of cisplatin in patients with cervical cancer and to identify potential effective drugs against cisplatin resistance, we established a hypoxia-inducible factor-1 (HIF-1)-related risk score (HRRS) model using clinical data from patients treated with cisplatin. Cox and LASSO regression analyses were used to stratify patient risks and prognosis. Through qRT-PCR, we validated nine potential prognostic HIF-1 genes that successfully predict cisplatin responsiveness in patients and cell lines. Subsequently, we identified fostamatinib, an FDA-approved spleen tyrosine kinase inhibitor, as a promising drug for targeting the HRRS-high group. We observed a positive correlation between the IC50 values of fostamatinib and HRRS in cervical cancer cell lines. Moreover, fostamatinib exhibited potent anticancer effects on high HRRS groups in vitro and in vivo. In summary, we developed a hypoxia-related gene signature that suggests cisplatin response prediction in cervical cancer and identified fostamatinib as a potential novel treatment approach for resistant cases.

4.
World J Diabetes ; 15(6): 1340-1352, 2024 Jun 15.
Article in English | MEDLINE | ID: mdl-38983805

ABSTRACT

BACKGROUND: The mechanism of improvement of type 2 diabetes after duodenal-jejunal bypass (DJB) surgery is not clear. AIM: To study the morphological and functional changes in adipose tissue after DJB and explore the potential mechanisms contributing to postoperative insulin sensitivity improvement of adipose tissue in a diabetic male rat model. METHODS: DJB and sham surgery was performed in a-high-fat-diet/streptozotocin-induced diabetic rat model. All adipose tissue was weighed and observed under microscope. Use inguinal fat to represent subcutaneous adipose tissue (SAT) and mesangial fat to represent visceral adipose tissue. RNA-sequencing was utilized to evaluate gene expression alterations adipocytes. The hematoxylin and eosin staining, reverse transcription-quantitative polymerase chain reaction, western blot, and enzyme-linked immunosorbent assay were used to study the changes. Insulin resistance was evaluated by immunofluorescence. RESULTS: After DJB, whole body blood glucose metabolism and insulin sensitivity in adipose tissue improved. Fat cell volume in both visceral adipose tissue (VAT) and SAT increased. Compared to SAT, VAT showed more significantly functional alterations after DJB and KEGG analysis indicated growth hormone (GH) pathway and downstream adiponectin secretion were involved in metabolic regulation. The circulating GH and adiponectin levels and GH receptor and adiponectin levels in VAT increased. Cytological experiment showed that GH stimulated adiponectin secretion and improve insulin sensitivity. CONCLUSION: GH improves insulin resistance in VAT in male diabetic rats after receiving DJB, possibly by increasing adiponectin secretion.

5.
World J Diabetes ; 15(6): 1291-1298, 2024 Jun 15.
Article in English | MEDLINE | ID: mdl-38983814

ABSTRACT

BACKGROUND: Lingguizhugan (LGZG) decoction is a widely used classic Chinese medicine formula that was recently shown to improve high-fat diet (HFD)-induced insulin resistance (IR) in animal studies. AIM: To assess the therapeutic effect of LGZG decoction on HFD-induced IR and explore the potential underlying mechanism. METHODS: To establish an IR rat model, a 12-wk HFD was administered, followed by a 4-wk treatment with LGZG. The determination of IR status was achieved through the use of biochemical tests and oral glucose tolerance tests. Using a targeted meta-bolomics platform to analyze changes in serum metabolites, quantitative real-time PCR (qRT-PCR) was used to assess the gene expression of the ribosomal protein S6 kinase beta 1 (S6K1). RESULTS: In IR rats, LGZG decreased body weight and indices of hepatic steatosis. It effectively controlled blood glucose and food intake while protecting islet cells. Metabolite analysis revealed significant differences between the HFD and HFD-LGZG groups. LGZG intervention reduced branched-chain amino acid levels. Levels of IR-related metabolites such as tryptophan, alanine, taurine, and asparagine decreased significantly. IR may be linked to amino acids due to the contemporaneous increase in S6K1 expression, as shown by qRT-PCR. CONCLUSIONS: Our study strongly suggests that LGZG decoction reduces HFD-induced IR. LGZG may activate S6K1 via metabolic pathways. These findings lay the groundwork for the potential of LGZG as an IR treatment.

6.
World J Diabetes ; 15(6): 1051-1059, 2024 Jun 15.
Article in English | MEDLINE | ID: mdl-38983823

ABSTRACT

Monogenic diabetes, constituting 1%-2% of global diabetes cases, arises from single gene defects with distinctive inheritance patterns. Despite over 50 ass-ociated genetic disorders, accurate diagnoses and management of monogenic diabetes remain inadequate, underscoring insufficient clinician awareness. The disease spectrum encompasses maturity-onset diabetes of the young (MODY), characterized by distinct genetic mutations affecting insulin secretion, and neonatal diabetes mellitus (NDM) - a heterogeneous group of severe hyperglycemic disorders in infants. Mitochondrial diabetes, autoimmune monogenic diabetes, genetic insulin resistance and lipodystrophy syndromes further diversify the monogenic diabetes landscape. A tailored approach based on phenotypic and biochemical factors to identify candidates for genetic screening is recommended for suspected cases of MODY. NDM diagnosis warrants immediate molecular genetic testing for infants under six months. Identifying these genetic defects presents a unique opportunity for precision medicine. Ongoing research aimed to develop cost-effective genetic testing methods and gene-based therapy can facilitate appropriate identification and optimize clinical outcomes. Identification and study of new genes offer a valuable opportunity to gain deeper insights into pancreatic cell biology and the pathogenic mechanisms underlying common forms of diabetes. The clinical review published in the recent issue of World Journal of Diabetes is such an attempt to fill-in our knowledge gap about this enigmatic disease.

7.
Euro Surveill ; 29(28)2024 Jul.
Article in English | MEDLINE | ID: mdl-38994602

ABSTRACT

Carbapenem-resistant Acinetobacter baumannii (CRAb) is an important pathogen causing serious nosocomial infections. We describe an outbreak of CRAb in an intensive care unit in the Netherlands in 2021. During an outbreak of non-resistant A. baumannii, while infection control measures were in place, CRAb isolates carrying highly similar bla NDM-1 - and tet(x3)-encoding plasmids were isolated from three patients over a period of several months. The chromosomal and plasmid sequences of the CRAb and non-carbapenemase-carrying A. baumannii isolates cultured from patient materials were analysed using hybrid assemblies of short-read and long-read sequences. The CRAb isolates revealed that the CRAb outbreak consisted of two different strains, carrying similar plasmids. The plasmids contained multiple antibiotic resistance genes including the tetracycline resistance gene tet(x3), and the bla NDM-1 and bla OXA-97 carbapenemase genes. We determined minimal inhibitory concentrations (MICs) for 13 antibiotics, including the newly registered tetracycline antibiotics eravacycline and omadacycline. The CRAb isolates showed high MICs for tetracycline antibiotics including eravacycline and omadacycline, except for minocycline which had a low MIC. In this study we show the value of sequencing multidrug-resistant A. baumannii for outbreak tracking and guiding outbreak mitigation measures.


Subject(s)
Acinetobacter Infections , Acinetobacter baumannii , Anti-Bacterial Agents , Cross Infection , Drug Resistance, Multiple, Bacterial , Microbial Sensitivity Tests , Tetracyclines , beta-Lactamases , Acinetobacter baumannii/genetics , Acinetobacter baumannii/drug effects , Acinetobacter baumannii/isolation & purification , Acinetobacter baumannii/enzymology , Humans , Acinetobacter Infections/microbiology , Acinetobacter Infections/epidemiology , Tetracyclines/pharmacology , Anti-Bacterial Agents/pharmacology , Cross Infection/microbiology , Cross Infection/epidemiology , beta-Lactamases/genetics , Netherlands/epidemiology , Drug Resistance, Multiple, Bacterial/genetics , Plasmids/genetics , Disease Outbreaks , Bacterial Proteins/genetics , Carbapenems/pharmacology , Intensive Care Units
8.
Curr Med Chem ; 2024 Jul 11.
Article in English | MEDLINE | ID: mdl-38994619

ABSTRACT

INTRODUCTION: Osteosarcoma (OS) drug resistance often leads to a poor prognosis. Recent evidence suggests that long non-coding RNAs play a crucial role in regulating tumor drug resistance. METHOD: This study aims to investigate the involvement of lncRNA LAMTOR5-AS1 in OS. RNA-seq and qRT-PCR were performed, and the relationship between LAMTOR5- AS1, miR-34a-3p, SIRT1, and HNF4A was determined using Dual-luciferase reporter assays and RNA immunoprecipitation assays. Gain- and loss-of-function assays were measured using CCK-8, cell proliferation, and colony formation assays. RESULT: The study found that the dysregulated LAMTOR5-AS1 acts as a competing endogenous RNA (ceRNA) and competitively protects the HNF4A mRNA 3' UTR from miR-34a-3p. In addition, in vitro functional studies showed that HNF4A can physically interact with SIRT1 to synergistically inhibit osteosarcoma drug resistance. The study found that LAMTOR5-AS1 regulates drug resistance in osteosarcoma through the miR-34a-3p/HNF4A or miR-34a-3p/SIRT1/HNF4A axis. CONCLUSION: These findings offer new insights into lncRNA-mediated drug resistance in cancer and may serve as potential biomarkers for cancer therapy.

9.
Article in English | MEDLINE | ID: mdl-38994622

ABSTRACT

BACKGROUND: The emergence of drug resistance to oxaliplatin (OXA) is one of the critical obstacles in the therapy of advanced Hepatocellular Carcinoma (HCC). As an ethyl derivative of the natural compound epigallocatechin gallate (epigallocatechin-3-gallate, EGCG), Y6 was found to be able to enhance the sensitivity of HCC cells to doxorubicin. This study aimed to investigate the effect of Y6 on oxaliplatin resistance in HCC. METHODS: MTT was used to determine the reversal effect of Y6 on OXA resistance. To further explore the reversal mechanism, we treated OXA alone or in combination with Y6 or EGCG in drugresistant cells and observed the morphological changes of the cells. At the same time, transwell assay was used to detect the invasion and migration ability of cells. Moreover, Real-time PCR and Western blot analysis were performed to determine the expression levels of the miR-338-3p gene, HIF-1α/Twist proteins, and EMT-related proteins. RESULTS: We found that Y6 could inhibit the proliferation of HCC cells and effectively reverse the drug resistance of oxaliplatin-resistant human liver cancer cells (SMMC-7721/OXA) to OXA, and the reversal effect was more significant than that of its lead drug EGCG. Most of the cells in the control group and OXA group showed typical mesenchymal-like cell morphology, while most of the cells in co-administration groups showed typical epithelioid cell morphology, and the ability of the cells to invade and migrate decreased dramatically, particularly in Y6 plus OXA group. At the same time, Y6 could up-regulate the EMT epithelial marker protein E-cadherin and down-regulate the interstitial marker protein Vimentin. In addition, in co-administration groups, the expression of miR-338-3p was up-regulated, while the expression of HIF-1α and Twist was down-regulated. CONCLUSION: Y6 significantly enhanced the susceptibility of drug-resistant cells to OXA, and the process may be related to the regulation of miR-338-3p/HIF-1α / TWIST pathway to inhibit EMT. Therefore, Y6 could be considered an effective medication resistance reversal agent, which could improve the therapeutic effect for hepatocellular cancer patients.

11.
Int J Oncol ; 65(2)2024 Aug.
Article in English | MEDLINE | ID: mdl-38994761

ABSTRACT

Glioblastoma (GBM) is the most common malignancy of the central nervous system in adults. The current standard of care includes surgery, radiation therapy, temozolomide; and tumor­treating fields leads to dismal overall survival. There are far limited treatments upon recurrence. Therapies to date are ineffective as a result of several factors, including the presence of the blood­brain barrier, blood tumor barrier, glioma stem­like cells and genetic heterogeneity in GBM. In the present review, the potential mechanisms that lead to treatment resistance in GBM and the measures which have been taken so far to attempt to overcome the resistance were discussed. The complex biology of GBM and lack of comprehensive understanding of the development of therapeutic resistance in GBM demands discovery of novel antigens that are targetable and provide effective therapeutic strategies.


Subject(s)
Blood-Brain Barrier , Brain Neoplasms , Drug Resistance, Neoplasm , Glioblastoma , Glioblastoma/drug therapy , Glioblastoma/pathology , Glioblastoma/genetics , Humans , Brain Neoplasms/drug therapy , Brain Neoplasms/pathology , Brain Neoplasms/genetics , Brain Neoplasms/therapy , Blood-Brain Barrier/metabolism , Neoplastic Stem Cells/drug effects , Neoplastic Stem Cells/pathology , Molecular Targeted Therapy/methods
12.
Pest Manag Sci ; 2024 Jul 12.
Article in English | MEDLINE | ID: mdl-38994798

ABSTRACT

BACKGROUND: Insecticide resistance among invasive tephritid fruit flies poses a great risk to national food security and has the potential to disrupt quarantine and eradication programs, which rely on the efficacy of Spinosad to prevent widespread establishment in North America. During 2022 to 2023 we surveyed the extent of Spinosad resistance of two key species, oriental fruit fly Bactrocera dorsalis, and melon fly Zeugodacus cucurbitae, from 20 sites across five Hawaiian Islands including Kaua'i, O'ahu, Maui, Molokai and the "Big Island" (Hawai'i). RESULTS: We used topical thoracic applications of eight concentrations of Spinosad ranging from 0.028 to 3.6 mg/mL to evaluate the lethal concentration (LC50 and LC99) required to kill wild-caught males. Resistance ratios (RR) were calculated by comparing the LC50 of wild flies to laboratory susceptible lines maintained in colony. Our results identified at least two new sites of concern for melon fly resistance on the Big Island, and at least four sites of concern for oriental fruit fly, all of which were located on the Big Island. At these locations RRs were >5. On O'ahu, melon fly RRs were >10. CONCLUSIONS: The persistence of Spinosad resistance is concerning, yet it is a reduction compared to the values reported previously and before changes to Spinosad use recommendations by local extension agents beginning in 2017. For oriental fruit fly, these RR values are the highest levels that have been detected in wild Hawai'i populations. These data suggest that expanded Spinosad reduction and replacement programs are warranted given the ongoing issues with Spinosad resistance in Hawai'i and expansion in the number of species affected. © 2024 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.

13.
J Cell Mol Med ; 28(13): e18525, 2024 Jul.
Article in English | MEDLINE | ID: mdl-38982317

ABSTRACT

Triple-negative breast cancer (TNBC) is often considered one of the most aggressive subtypes of breast cancer, characterized by a high recurrence rate and low overall survival (OS). It is notorious for posing challenges related to drug resistance. While there has been progress in TNBC research, the mechanisms underlying chemotherapy resistance in TNBC remain largely elusive. We collect single-cell RNA sequencing (scRNA-seq) data from five TNBC patients susceptible to chemotherapy and five resistant cases. Comprehensive analyses involving copy number variation (CNV), pseudotime trajectory, cell-cell interactions, pseudospace analysis, as well as transcription factor and functional enrichment are conducted specifically on macrophages and malignant cells. Furthermore, we performed validation experiments on clinical samples using multiplex immunofluorescence. We identified a subset of SPP1+ macrophages that secrete SPP1 signals interacting with CD44 on malignant cell surfaces, potentially activating the PDE3B pathway within malignant cells via the integrin pathway, leading to chemotherapy resistance. The abnormally enhanced SPP1 signal between macrophages and malignant cells may serve as a factor promoting chemotherapy resistance in TNBC patients. Therefore, SPP1+ macrophages could potentially serve as a therapeutic target to reduce chemotherapy resistance.


Subject(s)
Cell Communication , Drug Resistance, Neoplasm , Hyaluronan Receptors , Macrophages , Osteopontin , Single-Cell Analysis , Transcriptome , Triple Negative Breast Neoplasms , Humans , Hyaluronan Receptors/metabolism , Hyaluronan Receptors/genetics , Drug Resistance, Neoplasm/genetics , Osteopontin/metabolism , Osteopontin/genetics , Single-Cell Analysis/methods , Macrophages/metabolism , Triple Negative Breast Neoplasms/genetics , Triple Negative Breast Neoplasms/metabolism , Triple Negative Breast Neoplasms/pathology , Triple Negative Breast Neoplasms/drug therapy , Female , Gene Expression Regulation, Neoplastic , Cell Line, Tumor , Gene Expression Profiling
14.
BMC Infect Dis ; 24(1): 680, 2024 Jul 09.
Article in English | MEDLINE | ID: mdl-38982386

ABSTRACT

BACKGROUND: Aminoglycosides have been a cornerstone of the treatment of nosocomial infections caused by Pseudomonas aeruginosa for over 80 years. However, escalating emergence of resistance poses a significant challenge. Therefore, this study aimed to investigate the prevailing patterns of aminoglycoside resistance among clinical isolates of P. aeruginosa in Iran; as well as the underlying resistance mechanisms observed in patients referred to Ardabil hospitals. METHODS: A total of 200 isolates from five hospitals were evaluated. The resistance profiles of P. aeruginosa isolates to tobramycin, amikacin, and netilmicin were determined using the disk diffusion method. The capacity of aminoglycoside-resistant isolates to form biofilms was assessed through a phenotypic assay, and the results were confirmed using the gene amplification technique. The presence of genes associated with aminoglycoside resistance was detected using polymerase chain reaction (PCR). Quantitative reverse transcription PCR (qRT-PCR) was performed to measure the expression levels of genes encoding the MexXY-OprM efflux pump and PhoPQ two-component system (TCS). RESULTS: The prevalence of aminoglycoside-resistant P. aeruginosa isolates was 48%, with 94.7% demonstrating multidrug resistance (MDR). All aminoglycoside-resistant P. aeruginosa strains exhibited biofilm-forming capabilities and harbored all the genes associated with biofilm production. Among the nine genes encoding 16S rRNA methylase and aminoglycoside-modifying enzymes, three genes were detected in these isolates: aac(6')-Ib (85.4%), ant(2'')-Ia (18.7%), and aph(3')-VI (3.1%). Additionally, all aminoglycoside-resistant P. aeruginosa isolates carried mexY and phoP genes, although the expression levels of mexY and phoP were 75% and 87.5%, respectively. CONCLUSION: Given the considerably high prevalence of aminoglycoside-resistant P. aeruginosa strains, urgent measures are warranted to transition towards the use of novel aminoglycosides and to uphold vigilant surveillance of resistance patterns.


Subject(s)
Aminoglycosides , Anti-Bacterial Agents , Biofilms , Microbial Sensitivity Tests , Pseudomonas Infections , Pseudomonas aeruginosa , Pseudomonas aeruginosa/drug effects , Pseudomonas aeruginosa/genetics , Pseudomonas aeruginosa/isolation & purification , Iran/epidemiology , Humans , Aminoglycosides/pharmacology , Anti-Bacterial Agents/pharmacology , Pseudomonas Infections/microbiology , Pseudomonas Infections/epidemiology , Biofilms/drug effects , Biofilms/growth & development , Prevalence , Drug Resistance, Multiple, Bacterial/genetics , Bacterial Proteins/genetics , Bacterial Proteins/metabolism , Drug Resistance, Bacterial/genetics , Amikacin/pharmacology , Cross Infection/microbiology , Cross Infection/epidemiology , Tobramycin/pharmacology
15.
BMC Endocr Disord ; 24(1): 109, 2024 Jul 10.
Article in English | MEDLINE | ID: mdl-38982395

ABSTRACT

BACKGROUND: This study aimed to explore the impact of Diacerein (DIC) on endocrine and cardio-metabolic changes in polycystic ovarian syndrome (PCOS) mouse model. METHODS: A total of 18 adult female mice (Parkes strain), aged 4-5 weeks, were randomly assigned to three groups, each comprising 6 animals, as follows: Group I (control), received normal diet and normal saline as vehicle for 51 days; Group II received Letrozole (LET; 6 mg/kg bw) for 21 days to induce PCOS; Group III received LET, followed by daily oral gavage administration of DIC (35 mg/kg bw) for 30 days. RESULTS: This study indicates that treatment with LET resulted in PCOS with characteristics such as polycystic ovaries, elevated testosterone, weight gain, visceral adiposity, high levels of insulin as well as fasting blood glucose in addition to insulin resistance, improper handling of ovarian lipids, atherogenic dyslipidemia, impaired Na + /K + -ATPase activity and serum, cardiac, and ovarian oxidative stress. Serum/ovarian adiponectin levels were lowered in LET-treated mice. In mice treated with LET, we also discovered a reduction in cardiac and serum paraoxonase 1 (PON1). Interestingly, DIC restored ovarian andcardio-metabolic abnormalities in LET-induced PCOS mice. DIC prevented the endocrine and cardio-metabolic changes brought on by letrozole-induced PCOS in mice. CONCLUSION: The ameliorative effects of DIC on letrozole-induced PCOS with concurrent oxidative stress, abdominal fat deposition, cardiac and ovarian substrate mishandling, glucometabolic dysfunction, and adiponectin/PON1 activation support the idea that DIC perhaps, restore compromised endocrine and cardio-metabolic regulators in PCOS.


Subject(s)
Anthraquinones , Aryldialkylphosphatase , Disease Models, Animal , Insulin Resistance , Polycystic Ovary Syndrome , Animals , Polycystic Ovary Syndrome/drug therapy , Polycystic Ovary Syndrome/chemically induced , Polycystic Ovary Syndrome/metabolism , Female , Mice , Anthraquinones/pharmacology , Anthraquinones/therapeutic use , Aryldialkylphosphatase/metabolism , Letrozole , Receptors, Adiponectin/metabolism , Oxidative Stress/drug effects , Adiponectin/metabolism
16.
BMC Infect Dis ; 24(1): 697, 2024 Jul 14.
Article in English | MEDLINE | ID: mdl-39004725

ABSTRACT

BACKGROUND: This case report presents a unique instance of abscesses with an uncommon pathogen isolated from blood cultures. CASE PRESENTATION: We present the case of a perianal abscess in a 50-year-old man with a history of cocaine abuse and bilateral hip replacements. The rapid progression led to septic shock and multi-organ failure, requiring intensive care unit admission, surgery including protective transversostomy. Blood cultures showed growth of Butyricimonas spp. with resistance to penicillin and piperacillin-tazobactam. The immediate switch to meropenem led to a significant improvement in the patient's condition. The patient was discharged after 40 days of hospitalization in good general condition and the reversal of the transversostomy was performed six months later. CONCLUSION: The identification of Butyricimonas faecihominis, a rarely reported pathogen, emphasizes the challenges of diagnosing and treating unusual infections. This case emphasizes the importance of rapid microbiological diagnosis, interdisciplinary collaboration, and targeted antibiotic therapy in the treatment of abscesses and sepsis.


Subject(s)
Abscess , Anti-Bacterial Agents , Humans , Male , Middle Aged , Abscess/microbiology , Abscess/drug therapy , Anti-Bacterial Agents/therapeutic use , Anti-Bacterial Agents/pharmacology , Meropenem/therapeutic use
17.
Proc Natl Acad Sci U S A ; 121(29): e2315310121, 2024 Jul 16.
Article in English | MEDLINE | ID: mdl-38990944

ABSTRACT

Bacitracin is a macrocyclic peptide antibiotic that is widely used as a topical treatment for infections caused by gram-positive bacteria. Mechanistically, bacitracin targets bacteria by specifically binding to the phospholipid undecaprenyl pyrophosphate (C55PP), which plays a key role in the bacterial lipid II cycle. Recent crystallographic studies have shown that when bound to C55PP, bacitracin adopts a highly ordered amphipathic conformation. In doing so, all hydrophobic side chains align on one face of the bacitracin-C55PP complex, presumably interacting with the bacterial cell membrane. These insights led us to undertake structure-activity investigations into the individual contribution of the nonpolar amino acids found in bacitracin. To achieve this we designed, synthesized, and evaluated a series of bacitracin analogues, a number of which were found to exhibit significantly enhanced antibacterial activity against clinically relevant, drug-resistant pathogens. As for the natural product, these next-generation bacitracins were found to form stable complexes with C55PP. The structure-activity insights thus obtained serve to inform the design of C55PP-targeting antibiotics, a key and underexploited antibacterial strategy.


Subject(s)
Anti-Bacterial Agents , Bacitracin , Microbial Sensitivity Tests , Anti-Bacterial Agents/pharmacology , Anti-Bacterial Agents/chemistry , Bacitracin/pharmacology , Bacitracin/chemistry , Structure-Activity Relationship , Drug Resistance, Bacterial/drug effects , Vancomycin/pharmacology , Vancomycin/chemistry , Vancomycin/analogs & derivatives , Drug Design , Polyisoprenyl Phosphates/metabolism , Polyisoprenyl Phosphates/chemistry , Polyisoprenyl Phosphates/pharmacology
18.
Cell Signal ; 121: 111295, 2024 Jul 10.
Article in English | MEDLINE | ID: mdl-38996955

ABSTRACT

Calpain2 is a conventional member of the non-lysosomal calpain protease family that has been shown to affect the dynamics of focal and cell-cell adhesions by proteolyzing the components of adhesion complexes. Here, we inactivated calpain2 using CRISPR/Cas9 in epithelial MDCK cells. We show that depletion of calpain2 has multiple effects on cell morphology and function. Calpain2-depleted cells develop epithelial shape, however, they cover a smaller area, and cell clusters are more compact. Inactivation of calpain2 enhanced restoration of transepithelial electrical resistance after calcium switch, decreased cell migration, and delayed cell scattering induced by HGF/SF. In addition, calpain2 depletion prevented morphological changes induced by ERK2 overexpression. Interestingly, proteolysis of several calpain2 targets, including E-cadherin, ß-catenin, talin, FAK, and paxillin, was not discernibly affected by calpain2 depletion. Taken together, these data suggest that calpain2 regulates the stability of cell-cell and cell-substratum adhesions indirectly without affecting the proteolysis of these adhesion complexes.

19.
Environ Pollut ; 358: 124532, 2024 Jul 10.
Article in English | MEDLINE | ID: mdl-38996991

ABSTRACT

Sulfonamide antibiotics and polycyclic aromatic hydrocarbons (PAHs) often coexist in soil, leading to compound pollution through various pathways. This study focuses on sulfamethazine (SMZ) and PAHs (fluoranthene) as the subject for compound pollution research. Using a soil-groundwater simulation system, we investigated the migration characteristics of SMZ under coexistence with fluoranthene (Fla) and observed variations in the abundance of antibiotic resistance genes (ARGs). Through molecular docking simulations and isothermal adsorption experiments, we discovered that Fla bound with SMZ via π-π interactions, resulting in a 20.9% increase in the SMZ soil-water partition coefficient. Under compound conditions, the concentration of SMZ in surface soil could reach 1.4 times that of SMZ added alone, with an 13.4% extension in SMZ half-life. The deceleration of SMZ's vertical migration rate placed additional stress on surface soil microbiota, leading to a proliferation of ARGs by 66.3%-125.8%. Moreover, under compound pollution, certain potential hosts like Comamonadaceae and Gemmatimonas exhibited a significant positive correlation with resistance genes such as sul 1 and sul 2. These findings shed light on the impact of PAHs on sulfonamide antibiotic migration and the abundance of ARGs. They also provide theoretical insights for the development of technologies aimed at mitigating compound pollution in soil.

20.
Article in English | MEDLINE | ID: mdl-39008314

ABSTRACT

In an effort to expedite the publication of articles, AJHP is posting manuscripts online as soon as possible after acceptance. Accepted manuscripts have been peer-reviewed and copyedited, but are posted online before technical formatting and author proofing. These manuscripts are not the final version of record and will be replaced with the final article (formatted per AJHP style and proofed by the authors) at a later time.

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