Publications by authors named "Shubham Roy"

Molecular imaging probes hold great promise in disease diagnostics and their therapeutic interventions. However, a single imaging modality sometimes lacks efficiency in all kinds of diseases. Conditions such as cancer, cardiovascular disorders, and neurodegenerative diseases critically require multimodal imaging to characterize complex biological environments accurately.

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A novel Yb, Er co-doped GdOF-based nanoprobe with integrated multimodal functionalities has been designed and optimized for simultaneous pH-responsive drug release, photothermal-photodynamic therapy (PTT-PDT), and dual-mode upconversion luminescence and magnetic resonance imaging. The nanoprobe comprises polydopamine (PDA)-coated Yb, Er co-doped GdOF nanoparticles, functionalized with NH-PEG-NH and hyaluronic acid (HA) to provide physical stability and impart CD44-targeting specificity, while doxorubicin (DOX) is loaded for chemotherapy. In this proof-of-concept demonstration, we show that upon 980 nm (0.

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Aptamers, valued for their stability, target affinity, and modifiability, have advanced biosensing, yet key challenges hinder their translation into practical sensing platforms. This work explores the future potential of aptasensing technologies across various fields, such as clinical chemistry, quality control, protein analysis, wastewater treatment, nanomaterial characterization, forensic evidence analysis, animal health monitoring, heavy metal detection, security, machine learning, and AI in aptamer design. This review also provides a detailed discussion of their underlying molecular mechanisms, highlighting their applications and effectiveness.

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Cancer survivors and their caregivers face significant psychological challenges, both during treatment and in the years following recovery. The emotional toll of cancer, like fear, uncertainty, anxiety, and depression, can profoundly affect the quality of life for both survivors and caregivers. During treatment, survivors often experience emotional distress due to physical changes, treatment side effects, and fear of disease recurrence.

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It is a big challenge for precision therapy of glioblastoma, mainly due to the existence of blood-brain barrier (BBB), tumor immunosuppressive microenvironment (TIM), and lack of efficient treatment paradigms. Herein, a theranostic nanoplatform for the second near-infrared window (NIR-II) fluorescence imaging-guided membrane-targeted mild photothermal-immunotherapy of glioblastoma using genetically engineered CSF1R/IL12-macrophage membrane (MM)-liposome hybrid nanovesicles, is reported. By mimicking lipophilic membrane probe (Dil) with octadecyl chains, a NIR-II emissive photothermal dye (IRC18), which realizes labeling of nanovesicle lipid bilayers for biodistribution tracing, glioblastoma diagnosis, and molecular imaging of tumoral microenvironment, is synthesized.

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Magnetic resonance imaging (MRI) guidance in the realm of anticancer therapy is crucial to visualize the spread of tumors in deep tissues, accumulate the therapeutics, and trigger them for precise therapy. Recent studies bridge this gap by integrating MRI contrast agents (CAs) with different therapeutic regimes for a better outcome. In this context, manganese-based materials hold great potential owing to their dual-modal MR-relaxation, less toxicity, and other therapeutic capabilities such as chemodynamic therapy, immunotherapy, etc.

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With the aging population, fitness issues, poor bone healing, and high infection rates are associated with bone fractures and other bone diseases. Nevertheless, traditional approaches and materials struggle to treat orthopedic diseases by loading exogenous stem cells, growth factors, or merely structurally simulating the bone periosteum. The advancement of biomedical materials has become critical in addressing the challenges associated with bone tissue regeneration, encompassing a range of conditions including bone wounds, inflammation, infections, fractures, and the degenerative effects of aging or metabolic disorders.

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Antibiotic-resistant bacteria often cause lethal infections in both the surficial and deep organs of humans. Failure of antibiotics in resistant infections leads to more effective alternative therapies, like spatiotemporally controllable piezodynamic therapy (PZDT) with deep penetration. Currently, PZDT demands further investigation for improved treatment outcomes and the corresponding therapeutic mechanisms.

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Cyanine dye-containing nanoparticles have widely been used in "all-in-one" NIR fluorescence imaging (FI)-guided photothermal therapy (PTT) because of their intrinsically large extinction coefficient and available physical and chemical modulation methods to tune absorption and emission wavelengths. The combination of good brightness and excellent tumor-targeting capacity is the key to realize efficient NIR-II FI-guided PTT. In this study, by covalently decorating NIR-II absorptive cyanine dyes with bulky AIE motify, we demonstrate how steric hindrance suppresses π-π stacking-induced fluorescence quenching and contributes to the good brightness of NIR-II FI of subcutaneous glioblastoma.

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Exosome-liposome hybrid-based vehicles (ELV) are promising carriers for cancer treatment, but there are rare efficient theranostic probes to label their lipid bilayer membrane for precisely tracing biodistribution and execute potent therapy. As both fluorescence imaging and photothermal therapy in the second near-infrared window (NIR-II) has intrinsically deep penetration and high efficacy to ablate tumors, herein the design and synthesis of lipophilic NIR-II cyanine dyes with strong donor strength is reported to label lipid bilayer membrane of ELV for NIR-II fluorescence image-guided and targeted NIR-II photothermal treatment of subcutaneous glioblastoma. Via lipid film hydration and subsequent extrusion method, the synthesized ELV (NIR-C-EL) is formulated with NIR-C labeling, cyclic arginylglycylaspartic acid decoration, liposomal PEGylation, and biological exosome function.

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Glioblastoma multiforme (GBM), a potential public health issue, is a huge challenge for the advanced scientific realm to solve. Chemodynamic therapy (CDT) based on the Fenton reaction emerged as a state-of-the-art therapeutic modality to treat GBM. However, crossing the blood-brain barrier (BBB) to reach the GBM is another endless marathon.

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This review focuses on the advancements in manganese (Mn) complex-based magnetic resonance imaging (MRI) agents for imaging different diseases. Here we emphasize the unique redox properties of Mn to deliver innovative MRI contrast agents, including small molecules, nanoparticles (NPs), metal-organic frameworks (MOFs), and polymer hybrids. Aspects of their rational design have been discussed, including size dependence, morphology tuning, surface property enhancement, etc.

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Surgery is one of the most important paradigms for tumor therapy, while fluorescence imaging (FI) offers real-time intraoperative guidance, greatly boosting treatment prognosis. The imaging fidelity heavily relies on not only imaging facilities but also probes for imaging-guided surgery (IGS). So far, a great number of IGS probes with emission in visible (400-700 nm) and near-infrared (NIR 700-1700 nm) windows have been developed for pinpointing disease margins intraoperatively.

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Second near-infrared (NIR-II) fluorescence imaging is the most advanced imaging fidelity method with extraordinary penetration depth, signal-to-background ratio, biocompatibility, and targeting ability. It is currently booming in the medical realm to diagnose tumors and is being widely applied for fluorescence-imaging-guided tumor surgery. To efficiently execute this modern imaging modality, scientists have designed various probes capable of showing fluorescence in the NIR-II window.

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Article Synopsis
  • * A new piezoelectric composite material combining chitosan and bismuth ferrite (BFO) nanocrystals shows great potential in efficiently decomposing pollutants and eliminating bacteria using ultrasound-mediated reactive oxygen species (ROS).
  • * This innovative material achieves about 87.8% pollutant reduction and nearly 99% bacterial eradication in a short time, while also being reusable, indicating its promising applications in wastewater treatment.
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Cancer, the leading global cause of mortality, poses a formidable challenge for treatment. The effectiveness of cancer therapies, ranging from chemotherapy to immunotherapy, relies on the precise delivery of therapeutic agents to tumor tissues. Nanobiohybrids, resulting from the fusion of bacteria with nanomaterials, constitute a promising delivery system.

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Multidrug-resistant bacteria are a serious problem in biomedical applications that decrease the wound healing process and increase the mortality rate. Therefore, in this study, we have prepared a green-synthesized silver-nanoparticle-encapsulated mucilage microsphere (HMMS@GSNP) from leaves and applied it to pathogen-infected burn and excision wounds. Biophysical properties like size, polydispersity index, absorbance capacity, and drug release were measured by different techniques like field-emission scanning electron microscopy, dynamic light scattering, swelling ratio, etc.

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In the modern era, water pollution, especially from industries, agricultural farms, and residential areas, is caused by the release of a large scale of heavy metals, organic pollutants, chemicals, etc., into the environment, posing a serious threat to aquatic ecosystems and nature. Moreover, untreated sewage waste discharged directly into nearby water bodies can cause various diseases to mankind due to the high load of fecal coliform bacteria.

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Fluorescence imaging in the second near-infrared window (NIR-II) is burgeoning because of its higher imaging fidelity in monitoring physiological and pathological processes than clinical visible/the second near-infrared window fluorescence imaging. Notably, the imaging fidelity is heavily dependent on fluorescence agents. So far, indocyanine green, one of the polymethine dyes, with good biocompatibility and renal clearance is the only dye approved by the Food and Drug Administration, but it shows relatively low NIR-II brightness.

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Mucilage is a sticky substance found in various plants and microorganisms and is made up of proteins and polysaccharides. Mucilage fromis a complex polysaccharide traditionally used to treat different skin diseases. In our study, we fabricated mucilage polymer fromleaves and evaluated its potential application in second-degree burns and excision wounds.

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Neurodegenerative disorders represent a significant and growing global health challenge, necessitating continuous advancements in diagnostic tools for accurate and early detection. This work explores the recent progress in Magnetic Resonance Imaging (MRI) techniques and their application in the realm of neurodegenerative disorders. The introductory section provides a comprehensive overview of the study's background, significance, and objectives.

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As the second-leading cause of human death, cancer has drawn attention in the area of biomedical research and therapy from all around the world. Certainly, the development of nanotechnology has made it possible for nanoparticles (NPs) to be used as a carrier for delivery systems in the treatment of tumors. This is a biomimetic approach established to craft remedial strategies comprising NPs cloaked with membrane obtained from various natural cells like blood cells, bacterial cells, cancer cells, .

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