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1.
PLOS Glob Public Health ; 4(3): e0003015, 2024.
Article in English | MEDLINE | ID: mdl-38536795

ABSTRACT

Globally, demands for the kidneys have surpassed supply both living and deceased donors. High demands relative to the availability have made the kidney one of the most saleable human organs. The main objective was to explore the drivers of kidney selling. Literature related to kidney selling and its drivers was explored in three databases including MEDLINE (PubMed), Scopus (Elsevier), and JSTOR covering the period from 1987 to 2022. A total of 15 articles were selected, which underwent thematic analysis. Investigators independently assessed the articles for relevance and study quality to synthesize the data. The thematic analysis involved a critical approach to understanding the reasons for kidney selling by examining power disparities and social inequities. Kidney selling and the underlying reasons for it showed similarities across various geographic regions. Several factors were identified which increased individuals' vulnerability for kidney selling. At the micro level, poverty and illiteracy emerged as significant factors. Lack of financial safety nets obliged family to resort to kidney selling which helped to alleviate poverty, resolve debt, and other urgent financial issues. Nonetheless, the revenues from kidney selling were also used to purchase luxury items (diverting away from investing in livelihood expenses) such as buying motorbikes, mobile phones and televisions. Family, and gender responsibilities also played roles in kidney selling such as obligations related to paying dowry made parents particularly vulnerable. Surprisingly, a few victims of kidney selling later adopted kidney brokering role to support their livelihood. Kidney selling was further fostered by lack of stringent policy to regulate and monitor background checks for kidney transplantation. There were myriad factors that affected individual's vulnerability to kidney selling which stemmed from micro (poverty, illiteracy), meso (weak legal system, lacking stringent institutional policy, regulatory framework) and macro (social inequalities, corruption, organ shortage, insufficient health infrastructure) levels.

2.
SSM Popul Health ; 25: 101583, 2024 Mar.
Article in English | MEDLINE | ID: mdl-38222673

ABSTRACT

Introduction: Intimate partner violence (IPV) is a significant public health, human rights, and development issue. While existing evidence posits that addressing social norms is key to IPV prevention, successful IPV interventions that include a norms approach are limited in number and methodological rigor and rarely include a formal investigation of the diffusion of intervention impact. We contribute novel findings to this intellectual and programmatic space with evidence on a social and behavior change communication (SBCC) intervention (Change Starts at Home) in Nepal designed to prevent IPV and shift social norms towards greater gender equity. Methods: Participants included 442 married women across 13 communities assessed at three timepoints: before intervention (baseline), at the completion of the core couple's curriculum and edutainment (midline), and at the conclusion of the diffusion curriculum (endline). Generalized estimating equations with propensity-score adjustments were used to determine change in outcomes at midline and endline for two intervention conditions (direct beneficiary, N = 173; and resident of the intervention community, (N = 178) relative to control (N = 91). Results: IPV victimization significantly decreased in both intervention conditions at midline, with larger reductions in direct beneficiaries. At endline, direct beneficiaries had sustained reduction in IPV relative to control participants. Positive injunctive norms also significantly improved by midline for both intervention groups, whereas improvements in descriptive norms for intervention groups were matched by improvements in the control group at both midline and endline. Several secondary outcomes showed significant improvements for both intervention groups at midline and/or endline, including in-law violence, financial decision-making, communication, and relationship quality, with additional improvements for the direct beneficiaries in attitudes, leadership, GBV advocacy, and diffusion. Conclusion: This study sheds light on the effectiveness of the Change intervention, the role of addressing social norms in IPV prevention efforts, and the benefits of organized diffusion.

3.
Pharmaceutics ; 15(9)2023 Aug 25.
Article in English | MEDLINE | ID: mdl-37765168

ABSTRACT

This study involves the fabrication and characterization of a multifunctional therapeutic nanocomposite system, as well as an assessment of its in vitro efficacy for breast cancer treatment. The nanocomposite system combines gold nanorods (GNRs) and gold nanoclusters (GNCs) to enable a combination of photothermal therapy and doxorubicin-based chemotherapy. GNRs of various sizes but exhibiting similar absorbance spectra were synthesized and screened for photothermal efficiency. GNRs exhibiting the highest photothermal efficiency were selected for further experiments. GNCs were synthesized in bovine serum albumin (BSA) and integrated into citrate-capped GNRs using layer-by-layer assembly. Glutaraldehyde crosslinking with the lysine residues in BSA was employed to immobilize the GNCs onto the GNRs, forming a stable "soft gel-like" structure. This structure provided binding sites for doxorubicin through electrostatic interactions and enhanced the overall structural stability of the nanocomposite. Additionally, the presence of GNCs allowed the nanocomposite system to emit robust fluorescence in the range of ~520 nm to 700 nm for self-detection. Hyaluronic acid was functionalized on the exterior surface of the nanocomposite as a targeting moiety for CD44 to improve the cellular internalization and specificity for breast cancer cells. The developed nanocomposite system demonstrated good stability in vitro and exhibited a pH- and near-infrared-responsive drug release behavior. In vitro studies showed the efficient internalization of the nanocomposite system and reduced cellular viability following NIR irradiation in MDA-MB-231 breast cancer cells. Together, these results highlight the potential of this nanocomposite system for targeted breast cancer therapy.

4.
J Econ Entomol ; 116(5): 1671-1678, 2023 10 10.
Article in English | MEDLINE | ID: mdl-37671504

ABSTRACT

Coconut free fatty acid (CFFA), a mixture of 8 fatty acids derived from coconut oil, is an effective repellent and deterrent against a broad array of hematophagous insects. In this study, we evaluated the oviposition deterrent activity of CFFA on spotted-wing drosophila (SWD; Drosophila suzukii), a destructive invasive pest of berries and cherries, and identified bioactive key-deterrent compounds. In laboratory 2-choice tests, CFFA deterred SWD oviposition in a dose-dependent manner with the greatest reduction (99%) observed at a 20-mg dose compared with solvent control. In a field test, raspberries treated with 20-mg CFFA received 64% fewer SWD eggs than raspberries treated with the solvent control. In subsequent laboratory bioassays, 2 of CFFA components, caprylic and capric acids, significantly reduced SWD oviposition by themselves, while 6 other components had no effect. In choice and no-choice assays, we found that a blend of caprylic acid and capric acid, at equivalent concentrations and ratio as in CFFA, was as effective as CFFA, while caprylic acid or capric acid individually were not as effective as the 2-component blend or CFFA at equivalent concentrations, indicating the 2 compounds as the key oviposition deterrent components for SWD. The blend was also as effective as CFFA for other nontarget drosophilid species in the field. Given that CFFA compounds are generally regarded as safe for humans, CFFA and its bioactive components have potential application in sustainably reducing SWD damage in commercial fruit operations, thereby reducing the sole reliance on insecticides.


Subject(s)
Caprylates , Drosophila , Female , Humans , Animals , Caprylates/pharmacology , Coconut Oil/pharmacology , Oviposition , Fruit , Fatty Acids , Solvents/pharmacology , Insect Control
6.
RSC Adv ; 12(31): 20074-20079, 2022 Jul 06.
Article in English | MEDLINE | ID: mdl-35919588

ABSTRACT

Up-conversion nanoparticles have garnered lots of attention due to their ability to transform low energy light (near-infrared) into high-energy (visible) light, enabling their potential use as remote visible light nano-transducers. However, their low efficiency restricts their full potential. To overcome this disadvantage, fluoroindate glasses (InF3) doped at different molar concentrations of Yb3+ and Er3+ were obtained using the melting-quenching technique, reaching the highest green emission at 1.4Yb and 1.75Er (mol%), which corresponds to the 4S3/2 → 4I15/2 (540-552 nm) transition. The particles possess the amorphous nature of the glass and have a high thermostability, as corroborated by thermogravimetric assay. Furthermore, the spectral decay curve analysis showed efficient energy transfer as the rare-earth ions varied. This was corroborated with the absolute quantum yield (QY) obtained (85%) upon excitation at 385 nm with QYEr = 17% and QYYb = 68%. Additionally, InF3-1.4Yb-1.75Er was milled and functionalized using poly(ethylene glycol) to impart biocompatibility, which is essential for biomedical applications. Such functionalization was verified using FTIR, TG/DSC, and XRD.

7.
PLOS Glob Public Health ; 2(10): e0000585, 2022.
Article in English | MEDLINE | ID: mdl-36962518

ABSTRACT

Kidney selling is a global phenomenon engraved by poverty and governance in low-income countries with the higher-income countries functioning as recipients and the lower-income countries as donors. Over the years, an increasing number of residents in a village near the capital city of Nepal have sold their kidneys. This study aims to explore the drivers of kidney selling and its consequences using ethnographic methods and multi-stakeholder consultations. An ethnographic approach was used in which the researcher lived and observed the residents' life and carried out formal and informal interactions including in-depth interviews with key informants, community members and kidney sellers in Hokse village, Kavrepalanchok district. Participants in the village were interacted by researchers who resided in the village. In addition, remote interviews were conducted with multiple relevant stakeholders at various levels that included legal workers, government officers, non-government organization (NGO) workers, medical professionals, and policymaker. All formal interviews were audio-recorded for transcription in addition to field notes and underwent thematic analysis. The study identified processes, mechanisms, and drivers of kidney selling. Historically, diversion of a major highway from the village to another village was found to impact the livelihood, economy and access to the urban centres, ultimately increasing poverty and vulnerability for kidney selling. Existing and augmented deprivation of employment opportunities were shown to foster emigration of villagers to India, where they ultimately succumbed to brokers associated with kidney selling. Population in the village also maintained social cohesion through commune living, social conformity (that had a high impact on decision making), including behaviours that deepened their poverty. Behaviours such as alcoholism, trusting and following brokers based on the persuasion and decision of their peers, relatives, and neighbours who became the new member of the kidney brokerage also contributed to kidney selling. The other reasons that may have influenced high kidney selling were perceived to be a poor level of education, high demands of kidneys in the market and an easy source of cash through selling. In Hokse village, kidney selling stemmed from the interaction between the brokers and community members' vulnerability (poverty and ignorance), mainly as the brokers raised false hopes of palliating the vulnerability. The decision-making of the villagers was influenced heavily by fellow kidney sellers, some of whom later joined the network of kidney brokers. Although sustained support in livelihood, development, and education are essential, an expanding network and influence of kidney brokers require urgent restrictive actions by the legal authority.

8.
Environ Monit Assess ; 193(9): 556, 2021 Aug 06.
Article in English | MEDLINE | ID: mdl-34357458

ABSTRACT

Urbanization creates new development in open spaces and agricultural fields, synonymous with increasing impervious surfaces. Such surfaces restrain the natural infiltration of water, and directly affect the non-point source pollution. Thus, consequential events like flooding and surface water degradation require spatial and quantitative information on impervious surfaces. Remote sensing technologies are widely used in impervious surface mapping of various geographical locations for environmental monitoring. In this study, the datasets from recently launched European Space Agency satellites (Sentinel-1 and Sentinel-2) and random forest classifier are used. The impervious surface growth of the study area, Lahore city, in 2015 and 2021, and growth trends are assessed. Results are validated with classification accuracy and comparison with similar datasets. The objective is to develop a reliable impervious surface mapping method with land cover quantification technique from multisource datasets. With a chi-square value of greater than 3.84 obtained from the McNemar test, the performance of fused data was superior to that of optical alone data in the classification. Over a 5-year period, Lahore grew at an annual rate of 2.14% comparable to the findings of Copernicus Land Services and the Atlas of Urban Expansion with an underestimation of 1% and 8.75%, respectively. Improvements in overall accuracy (2.7%) and kappa coefficient (5%) were seen in classified maps from fused datasets. Fusion of Sentinel datasets provide a reliable means of impervious surface mapping at city scale as an indicator of environmental quality which is valuable for the sustainable management of the city.


Subject(s)
Environmental Monitoring , Non-Point Source Pollution , Cities , Satellite Imagery , Urbanization
9.
Pharmaceutics ; 13(6)2021 Jun 08.
Article in English | MEDLINE | ID: mdl-34201333

ABSTRACT

Cancer is a heterogeneous and complex disease. Traditional cancer therapy is associated with low therapeutic index, acquired resistance, and various adverse effects. With the increasing understanding of cancer biology and technology advancements, more strategies have been exploited to optimize the therapeutic outcomes. The rapid development and application of nanomedicine have motivated this progress. Combinational regimen, for instance, has become an indispensable approach for effective cancer treatment, including the combination of chemotherapeutic agents, chemo-energy, chemo-gene, chemo-small molecules, and chemo-immunology. Additionally, smart nanoplatforms that respond to external stimuli (such as light, temperature, ultrasound, and magnetic field), and/or to internal stimuli (such as changes in pH, enzymes, hypoxia, and redox) have been extensively investigated to improve precision therapy. Smart nanoplatforms for combinational therapy have demonstrated the potential to be the next generation cancer treatment regimen. This review aims to highlight the recent advances in smart combinational therapy.

10.
Anal Chem ; 93(19): 7292-7299, 2021 05 18.
Article in English | MEDLINE | ID: mdl-33956419

ABSTRACT

Herein, we proposed an innovative visual quantitative sensing strategy based on thiol-ene click chemistry and the capillary action principle. A triethoxyvinylsilane (VTEO)- or mercaptopropylsilatrane (MPS)-modified interface was prepared for analyte recognition. Target analyte molecules containing thiol groups or C═C double bonds are coupled to the VTEO- or MPS-modified inner surface of the glass capillary tube via a thiol-ene click reaction, respectively. Then, the molecular recognition events were transformed into the wettability change of the inner wall of the glass capillary. The concentration of the target molecules was quantified by reading the height change of the water column in the capillary tube. As a proof of concept, this strategy was successfully used to build visual quantitative sensors for detecting glutathione and cholesterol. In addition, this strategy showed a good anti-interference ability to complex biological fluids and realized sensitive glutathione (GSH) and cholesterol detection in real human blood samples.


Subject(s)
Glutathione , Sulfhydryl Compounds , Cholesterol , Click Chemistry , Humans , Wettability
11.
J Interpers Violence ; 36(15-16): NP7840-NP7867, 2021 08.
Article in English | MEDLINE | ID: mdl-30917734

ABSTRACT

Approximately 54% of women in rural Nepal report lifetime physical or sexual violence. The Change Starts at Home project is a primary prevention strategy to reduce and prevent marital intimate partner violence (IPV). This study analyzed in-depth interviews with 17 married couples (n = 34 individuals) at intervention midline and end line. Case-based analysis and thematic summaries were used to assess change, couple concordance, and gendered reporting patterns at midline. Individual changes included husband's alcohol use and roaming tendencies. Relationship-level changes comprised labor roles, communication, decision making, conflict resolution, and experience of IPV. End line interviews were analyzed to understand sustenance of change within these same individual and relationship dynamics. Results indicate promising shifts in men's individual behavior and marital dynamics, which underpin IPV risk.


Subject(s)
Intimate Partner Violence , Spouses , Female , Humans , Intimate Partner Violence/prevention & control , Male , Marriage , Men , Nepal
12.
Tissue Eng Part A ; 27(13-14): 940-961, 2021 07.
Article in English | MEDLINE | ID: mdl-32924856

ABSTRACT

Vascularization is critical for engineering mineralized tissues. It has been previously shown that biomaterials containing preformed endothelial networks anastomose to host vasculature following implantation. However, the networks alone may not increase regeneration. In addition, a clinically applicable source of cells for vascularization is needed. In this study, vascular networks were generated from endothelial cells (ECs) derived from human induced pluripotent stem cells (iPSCs). Network formation by iPSC-ECs within fibrin gels was investigated in a mesenchymal stem cells (MSCs) coculture spheroid model. Statistical design of experiments technique was evaluated for its predicting capability during the optimization of experimental parameters. The prevascularized units were combined with hydroxyapatite nanoparticles to develop a vascularized composite hydrogel that was implanted in a rodent critical-sized cranial defect model. Immunohistological staining for human-specific CD31 at week 1 indicated the presence and maintenance of the implanted vessels. At 8 weeks, the prevascularized systems resulted in higher vessel density over MSC-only scaffolds. The implanted vessels appeared to establish flow with host vasculature. While there was a slight increase in bone volume in the prevascularized bone construct compared to MSC-only bone constructs, there was not a profound increase in bone regeneration. These results show that scaffolds with network structures can be generated from ECs derived from iPSC and that the networks survive and inosculate with the host postimplantation in a bone model. Impact statement Vascularization is critical for engineering bone. Prevascularized scaffolds have been shown to improve postimplantation vascularization. Herein, vascularized networks were generated from induced pluripotent cells derived from endothelial cells. These vascularized units were combined with a fibrin/hydroxyapatite scaffold to develop a prevascularized construct for bone regeneration. Implantation of these scaffolds in a small animal cranial defect model resulted in network inosculation and increased vascularization, but exhibited only a limited effect on bone formation. This study provides insight into the challenges of generating vascularized bone.


Subject(s)
Induced Pluripotent Stem Cells , Animals , Bone Regeneration , Endothelial Cells , Humans , Neovascularization, Physiologic , Osteogenesis , Tissue Engineering , Tissue Scaffolds
13.
Glob Public Health ; 16(10): 1618-1630, 2021 10.
Article in English | MEDLINE | ID: mdl-33021877

ABSTRACT

This study examines the diffusion effects of a Social and Behaviour Change Communication intervention in Nepal targeting gender equity and violence against women. The Change trial involves weekly radio programming, listening and discussion groups (LDGs), and community engagement. This longitudinal study analyses a repeated cross-sectional two-armed, pair-matched, single blinded cluster trial of a 9-month intervention. We used probability proportionate to size methodology to identify 72 wards in the Terai region, half of which were randomly assigned to the intervention. For the community-based survey, 20 women per ward were chosen using simple random sampling (N = 1440). Ten women from each intervention ward (N = 360) were also selected to participate in radio LDGs. Injunctive norms were measured with the Partner Violence Norms Scale-PVNS. Each one person increase in diffusion was associated with a 0.04 (SE = 0.01, p-value < 0.01) higher endline norms score, adjusting for confounders. There was evidence of effect modification with a significant baseline norm by diffusion interaction term (Estimate = -0.12, p-value = 0.04). Findings demonstrated that diffusion was related to endline norms only in communities with lower baseline levels of gender equitable norms. Study findings support the importance of diffusion as a pathway to intervention scale-up and norms change.


Subject(s)
Social Norms , Violence , Cross-Sectional Studies , Female , Humans , Longitudinal Studies , Surveys and Questionnaires
14.
Glob Public Health ; 16(4): 610-622, 2021 04.
Article in English | MEDLINE | ID: mdl-33186501

ABSTRACT

Intimate partner violence (IPV) is a significant global health issue. Organised diffusion has potential to influence changes in norms that perpetuate harmful practices by spreading anti-IPV messaging throughout social networks. The Change Starts at Home intervention in Nepal leverages radio programming and community mobilisation to address the perpetration of IPV. This qualitative analysis of couple interviews at the 18-month follow-up (N = 35 individuals) seeks to evaluate how the intervention messaging diffused into the community using organised diffusion as a framework, and how this influenced any changes in norms related to the perpetration of IPV. Overall, this study provides evidence that the Change at Home Intervention effectively diffused into the community and began to promote changes around IPV norms, especially among relationships that were socially and geospatially close. This analysis demonstrates the potential for organised diffusion to facilitate social norms change around IPV.


Subject(s)
Intimate Partner Violence , Social Norms , Humans , Intimate Partner Violence/prevention & control , Nepal , Surveys and Questionnaires
15.
Glob Public Health ; 16(4): 597-609, 2021 04.
Article in English | MEDLINE | ID: mdl-33090903

ABSTRACT

Intimate partner violence (IPV) impacts the physical and mental health of one in three women globally, with equally high rates in rural Nepal. The risk of physical violence, stalking, harassment, and homicide between intimate partners increases when alcohol is used by the perpetrator. This study evaluates the impact of Change Starts at Home, a nine-month intervention to prevent IPV in which 360 married couples in the Terai region of Nepal listened to a serial radio drama and engaged in Listening Group Discussions. A sub-sample of 18 couples were selected for individual in-depth interviews that were taken at the end of the intervention and 16 months later. Participants strongly and consistently associated alcohol use with IPV against women in their own and others' relationships. Husbands and wives agreed that men sustained reductions in alcohol use, conflict, and perpetration of IPV, attributed to improvements in communication, conflict resolution, and a reduction in alcohol expenditure following the intervention. The results of this study suggest that integrating programming on alcohol reduction within IPV prevention interventions in the Terai region of Nepal has benefits on couple functioning, alcohol consumption, and IPV perpetration.


Subject(s)
Intimate Partner Violence , Spouse Abuse , Alcohol Drinking/epidemiology , Female , Humans , Intimate Partner Violence/prevention & control , Male , Risk Factors , Sexual Partners , Violence
16.
Int J Nanomedicine ; 15: 8109-8119, 2020.
Article in English | MEDLINE | ID: mdl-33116521

ABSTRACT

BACKGROUND: Cancer is a complex heterogeneous disease to which singular modes of treatment mostly fail to produce a desired therapeutic efficacy. Targeting different cellular pathways using combinational therapies has been gaining popularity in cancer treatment, with the added benefit of reducing dosage and side effects. METHODS: A gold nanoparticle-mediated drug delivery nanoplatform was developed for co-delivery of doxorubicin and polo-like kinase 1 (PLK1) siRNA. Gold nanoparticles were coated with polyethyleneimine to facilitate assembly of PLK1 on the surface. Doxorubicin was loaded on nanoparticles through a pH-sensitive linker with a thiol group at one terminal end for controlled release. RESULTS: The therapeutic efficiency of this co-delivery system was evaluated in 2D and 3D cultured systems. The reduced IC50 value clearly demonstrated the synergistic effect of combined drug and gene delivery over their individual delivery in a cancer treatment model. CONCLUSION: This study may provide an adaptable, facile platform to investigate drug-siRNA combinations for cancer inhibition.


Subject(s)
Antineoplastic Agents/chemistry , Antineoplastic Agents/pharmacology , Breast Neoplasms/therapy , Drug Carriers/chemistry , Genetic Therapy/methods , Gold/chemistry , Metal Nanoparticles/chemistry , Antineoplastic Agents/therapeutic use , Breast Neoplasms/drug therapy , Breast Neoplasms/genetics , Cell Cycle Proteins/genetics , Combined Modality Therapy , Doxorubicin/chemistry , Doxorubicin/pharmacology , Doxorubicin/therapeutic use , Humans , Hydrogen-Ion Concentration , Polyethyleneimine/chemistry , Protein Serine-Threonine Kinases/genetics , Proto-Oncogene Proteins/genetics , RNA, Small Interfering/administration & dosage , RNA, Small Interfering/chemistry , RNA, Small Interfering/genetics , Polo-Like Kinase 1
17.
Sci Rep ; 10(1): 17413, 2020 10 15.
Article in English | MEDLINE | ID: mdl-33060764

ABSTRACT

Recombinant thrombomodulin (rTM) has been used for treatment of sepsis-associated disseminated intravascular coagulation. Recent studies have suggested that anticoagulant therapy might dampen the protective role of immunothrombosis. We examined if rTM might worsen infectious diseases. Male Sprague-Dawley rats with jugular-vein catheterization were divided into three groups: no anticoagulation; rTM pretreatment; rTM treatment at 6 h. Live methicillin-resistant Staphylococcus aureus (MRSA) was inoculated into the tail vein of rats. rTM was administered into the jugular-vein catheter before or 6 h after MRSA inoculation, while an equal volume of saline was administered in the no-anticoagulation group. Blood samples were collected from the jugular-vein catheter before, 6 h and 12 h after MRSA inoculation. Tissue samples were collected from anesthetized rats when moribund or 18 h after MRSA inoculation. The survival rate of rats in the no-anticoagulation group, rTM pretreatment group, and rTM treatment at 6-h group was 50%, 25%, and 75%, respectively. Bacterial burden in blood, lung, liver, and spleen was neither increased nor decreased in rats treated with rTM. The ratio of bacteria found in the extravascular space to those in the intravascular space was increased in rats treated with rTM although the statistical power for this was low because of the small sample size. Metabolomics analysis revealed that rTM treatment alleviated oxidative stress, as evidenced by the decrease in levels of oxidized glutathione with reference to reduced glutathione. rTM did not promote bacterial propagation but alleviated oxidative stress in our rat model of bloodstream infection with MRSA. Further large-scale studies are needed to confirm these findings.


Subject(s)
Anticoagulants/therapeutic use , Host-Pathogen Interactions , Methicillin-Resistant Staphylococcus aureus/pathogenicity , Oxidative Stress/drug effects , Staphylococcal Infections/metabolism , Thrombomodulin/therapeutic use , Animals , Anticoagulants/pharmacology , Male , Methicillin-Resistant Staphylococcus aureus/isolation & purification , Rats , Rats, Sprague-Dawley , Recombinant Proteins/pharmacology , Recombinant Proteins/therapeutic use , Staphylococcal Infections/complications , Staphylococcal Infections/microbiology , Thrombosis/complications , Thrombosis/prevention & control
18.
Acta Biomater ; 117: 374-383, 2020 11.
Article in English | MEDLINE | ID: mdl-33010515

ABSTRACT

Longitudinal in vivo monitoring is essential for the design and evaluation of biomaterials. An ideal method would provide three-dimensional quantitative information, high spatial resolution, deep tissue penetration, and contrast between tissue and material structures. Photoacoustic (PA) or optoacoustic imaging is a hybrid technique that allows three-dimensional imaging with high spatial resolution. In addition, photoacoustic imaging allows for imaging of vascularization based on the intrinsic contrast of hemoglobin. In this study, we investigated photoacoustic computed tomography (PACT) as a tool for longitudinal monitoring of an implanted hydrogel in a small animal model. Hydrogels were loaded with gold nanorods to enhance contrast and imaged weekly for 8 weeks. PACT allowed non-invasive three-dimensional, quantitative imaging of the hydrogels over the entire 8 weeks. Quantitative volume analysis was used to evaluate the in vivo degradation kinetics of the implants which deviated slightly from in vitro predictions. Multispectral imaging allowed for the simultaneous analysis of hydrogel degradation and local vascularization. These results provide support for the substantial potential of PACT as a tool for insight into biomaterial performance in vivo.


Subject(s)
Nanotubes , Photoacoustic Techniques , Animals , Gold , Hydrogels , Imaging, Three-Dimensional , Tomography, X-Ray Computed
19.
J Med Chem ; 63(18): 10263-10286, 2020 09 24.
Article in English | MEDLINE | ID: mdl-32830969

ABSTRACT

Disulfide bond formation is a critical post-translational modification of newly synthesized polypeptides in the oxidizing environment of the endoplasmic reticulum and is mediated by protein disulfide isomerase (PDIA1). In this study, we report a series of α-aminobenzylphenol analogues as potent PDI inhibitors. The lead compound, AS15, is a covalent nanomolar inhibitor of PDI, and the combination of AS15 analogues with glutathione synthesis inhibitor buthionine sulfoximine (BSO) leads to synergistic cell growth inhibition. Using nascent RNA sequencing, we show that an AS15 analogue triggers the unfolded protein response in glioblastoma cells. A BODIPY-labeled analogue binds proteins including PDIA1, suggesting that the compounds are cell-permeable and reach the intended target. Taken together, these findings demonstrate an extensive biochemical characterization of a novel series of highly potent reactive small molecules that covalently bind to PDI.


Subject(s)
Benzylamines/pharmacology , Enzyme Inhibitors/pharmacology , Phenols/pharmacology , Protein Disulfide-Isomerases/antagonists & inhibitors , Benzylamines/chemical synthesis , Benzylamines/metabolism , Cell Line, Tumor , Enzyme Inhibitors/chemical synthesis , Enzyme Inhibitors/metabolism , Glutathione/metabolism , Humans , Molecular Structure , Phenols/chemical synthesis , Phenols/metabolism , Structure-Activity Relationship , Unfolded Protein Response/drug effects
20.
Theranostics ; 10(15): 6959-6976, 2020.
Article in English | MEDLINE | ID: mdl-32550915

ABSTRACT

Ovarian cancer (OC) is estimated to kill ~14,000 women in the United States in 2019. Current chemotherapies to treat OC initially show therapeutic efficacy but frequently drug resistance develops, at which point therapies with alternative targets are needed. Herein, we are describing a novel approach to sensitize these tumors to standard chemotherapies by increasing the transcription of hypoxia-inducible factor antisense. Methods: Genome-wide Bru-seq analysis was performed to fully capture the nascent transcriptional signature of OC cells treated with the gp130 inhibitor, SC144. In vitro and in vivo analysis, including characterization of hypoxia and select protein expression, combination with standard of care chemotherapy and antitumor efficacy were performed to assess the biological activity of SC144 on induction of hypoxia in OC cells. Results: Bru-seq analysis of OVCAR8 cells treated with SC144 shows upregulation of hypoxia related genes. In addition, transcription of hypoxia-inducible factor antisense (HIF1A-AS2) was induced that in turn reduced expression of HIF-1α and simultaneously increased expression of NDRG1. Furthermore, we observed decreased protein levels of EGFR, Met, c-Myc, cyclin D1, MMP-2, MMP-9 and TF, and phosphorylation of Src and P130-cas. SC144-induced alterations of HIF-1α and NDRG1 were also confirmed in prostate cancer cells. Ciclopirox olamine (CPX) induces a cellular transcriptional profile comparable to SC144, suggesting a similar cellular mechanism of action between these two compounds. In addition, SC144 sensitized OC cells to olaparib, carboplatin and cisplatin, and shows better in vivo efficacy than CPX. Conclusion: Induction of hypoxic stress responses through inhibition of gp130 represents a novel approach to design effective anticancer treatments in combination with standard-of-care chemotherapy in OC and the efficacy reported here strongly supports their clinical development.


Subject(s)
Cisplatin/pharmacology , Drug Resistance, Neoplasm , Gene Expression Regulation, Neoplastic/drug effects , Hydrazines/pharmacology , Hypoxia-Inducible Factor 1, alpha Subunit/antagonists & inhibitors , Ovarian Neoplasms/drug therapy , Quinoxalines/pharmacology , RNA, Antisense/genetics , Animals , Antineoplastic Agents/pharmacology , Cell Line, Tumor , Disease Models, Animal , Female , Humans , Hypoxia-Inducible Factor 1, alpha Subunit/metabolism , Mice , Mice, Inbred C57BL , Ovarian Neoplasms/metabolism , Ovarian Neoplasms/pathology , RNA, Antisense/administration & dosage , Up-Regulation
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