Publications by authors named "Hem Jha"

The integration of biomolecules into supramolecular nanostructures forms the basis of the natural world. Naturally occurring liquid-liquid phase separation resulting in biomolecular condensates has inspired the formation of biomolecule-based smart materials with multi-dimensional applications. A non-covalent bio-condensation between biomass DNA and guanosine monophosphate (GMP) has been described, mimicking chromatin folding and creating a unique "all-nucleic" DNA-GMP condensates.

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The development of high-performance adsorbents for environmental remediation is a current need, and ionic porous organic polymers (iPOPs), due to their high physicochemical stability, high surface area, added electrostatic interaction, and easy reusability, have already established themselves as a better adsorbent. However, research on the structural design of high-performance iPOP-based adsorbents is still nascent. This study explored the building blocks' role in optimizing the polymers' charge density and surface area to develop better polymeric adsorbents.

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High mortality has been reported in severe cases of COVID-19. Emerging reports suggested that the severity is not only due to SARS-CoV-2 infection, but also due to coinfections by other pathogens exhibiting symptoms like COVID-19. During the COVID-19 pandemic, simultaneous respiratory coinfections with various viral (Retroviridae, Flaviviridae, Orthomyxoviridae, and Picoviridae) and bacterial (Mycobacteriaceae, Mycoplasmataceae, Enterobacteriaceae and Helicobacteraceae) families have been observed.

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Over the past several years, a significant increase in the expanding field of biomaterial sciences has been observed due to the development of biocompatible materials based on peptide derivatives that have intrinsic therapeutic potential. In this report, we synthesized nucleobase functionalized peptide derivatives (NPs). Hydrogelation in the synthesized NPs was induced by increasing their hydrophobicity with an aromatic moiety.

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The leaves of Araucaria cunninghamii are known to be nonedible and toxic. Previous studies have identified biflavones in various Araucaria species. This study aimed to investigate the in vitro cytotoxicity of the isolated compounds from Araucaria cunninghamii after metabolomics and network pharmacological analysis.

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The human gut microbiota is a complex and dynamic community of microorganisms, that influence metabolic, neurodevelopmental, and immune pathways. Microbial dysbiosis, characterized by changes in microbial diversity and relative abundances, is implicated in the development of various chronic neurological and neurodegenerative disorders. These disorders are marked by the accumulation of pathological protein aggregates, leading to the progressive loss of neurons and behavioural functions.

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Multi-walled Carbon Nanotubes (MWCNTs) are inert structures with high aspect ratios that are widely used as vehicles for targeted drug delivery in cancer and many other diseases. They are largely non-toxic in nature however, when cells are exposed to these nanotubes for prolonged durations or at high concentrations, they show certain adverse effects. These include cytotoxicity, inflammation, generation of oxidative stress, and genotoxicity among others.

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Article Synopsis
  • * Using in-silico methods, the research shows that endosulfan enhances the virulence of H. pylori, leading to mitochondrial dysfunction, inflammation, and changes in cellular structure.
  • * The findings indicate that this pesticide-bacteria interaction activates harmful cellular pathways, promoting disease development which suggests increased risks for gastrointestinal health when exposed to these factors together.
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  • Reactivation of the Epstein-Barr virus (EBV) has been linked to various diseases, particularly neurological conditions like Alzheimer's and multiple sclerosis, according to a recent study.
  • The study demonstrated that exposure to EBV and its glycoprotein M (gM) led to cognitive decline and increased anxiety in mice, alongside significant changes in brain structure and inflammation markers.
  • Elevated levels of key proteins related to neuroinflammation and Alzheimer's risk were found, indicating a strong association between EBV/gM and neurological issues.
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Epstein-Barr virus (EBV) may cause harm in immunocompromised conditions or on stress stimuli. Various chemical agents have been utilized to induce the lytic cycle in EBV-infected cells. However, apart from chemical agents and external stress stimuli, certain infectious agents may reactivate the EBV.

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  • The study investigates the link between a pathogenic bacterium and its effects on the gut-brain axis, potentially contributing to neurological disorders like Alzheimer's disease (AD).
  • It examines how different strains of the bacterium impact inflammatory responses in both gastric and neuronal cells, leading to increased production of inflammatory markers, reactive oxygen species, and signs of neuroinflammation.
  • The research highlights STAT3 as a crucial regulator in this process, showing that inhibiting STAT3 reduces inflammation and AD-related markers in neuronal cells affected by the bacterium's secretions.
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Neurotropic viruses can infiltrate the CNS by crossing the blood-brain barrier (BBB) through various mechanisms including paracellular, transcellular, and "Trojan horse" mechanisms during leukocyte diapedesis. These viruses belong to several families, including retroviruses; human immunodeficiency virus type 1 (HIV-1), flaviviruses; Japanese encephalitis (JEV); and herpesviruses; herpes simplex virus type 1 (HSV-1), Epstein-Barr virus (EBV), and mouse adenovirus 1 (MAV-1). For entering the brain, viral proteins act upon the tight junctions (TJs) between the brain microvascular endothelial cells (BMECs).

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  • The accumulation of misfolded proteins in cells leads to cellular health issues and is linked to neurodegenerative diseases, highlighting the importance of protein management within cells.* -
  • Research in transgenic mice suggests that a lack of chaperone proteins contributes to the aggregation of these misfolded proteins, affecting the natural balance known as proteostasis.* -
  • The study found that trehalose treatment boosts proteasome levels and function, promoting the removal of misfolded proteins and potentially improving cell viability, indicating a new molecular strategy to tackle protein misfolding diseases.*
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Cancer is a condition in which a few of the body's cells grow beyond its control and spread to other outward regions. Globally, gastric cancer (GC) is third most common cause of cancer-related mortality and the fourth most common kind of cancer. Persistent infection of VacA-positive () modulates cellular physiology and leads to GC.

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Self-assembled metal-ion cross-linked multifunctional hydrogels are gaining a lot of attention in the fields of biomedical and biocatalysis. Herein, we report a heat-triggered metallogel that was spontaneously formed by the self-assembly of adenosine 5'-monophosphate (AMP) and cobalt chloride, accompanied by a color transition depicting an octahedral to tetrahedral transition at high temperature. The hydrogel shows excellent stability in a wide pH window from 1 to 12.

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  • * Researchers used an inhibitor, methyl-β-cyclodextrin (MβCD), to deplete membrane cholesterol in cells and found significant changes in the expression of EBV latent genes and key signaling molecules related to infection.
  • * Results indicated that lower cholesterol levels led to decreased expression of certain proteins linked to EBV infection and revealed alterations in triglycerides and fatty acid levels, suggesting cholesterol's critical role in the pathogenesis of EBV in brain cells related to neurological disorders.
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Aurora kinase A (AURKA) is one of the crucial cell cycle regulators associated with gastric cancer. Here, we explored Epstein Barr Virus-induced gastric cancer progression through EBV protein EBNA1 with AURKA. We found that EBV infection enhanced cell proliferation and migration of AGS cells and upregulation of AURKA levels.

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The asymmetrical distribution of the cellular organelles inside the cell is maintained by a group of cell polarity proteins. The maintenance of polarity is one of the vital host defense mechanisms against pathogens, and the loss of it contributes to infection facilitation and cancer progression. Studies have suggested that infection of viruses and bacteria alters cell polarity.

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SARS-CoV-2 Envelope protein (E) is one of the crucial components in virus assembly and pathogenesis. The current study investigated its role in the SARS-CoV-2-mediated cell death and inflammation in lung and gastrointestinal epithelium and its effect on the gastrointestinal-lung axis. We observed that transfection of E protein increases the lysosomal pH and induces inflammation in the cell.

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and Epstein Barr virus (EBV) are group1 carcinogens and their role in Gastric cancer (GC) is well established. Previously we have shown that and EBV appears to support aggressive gastric oncogenesis through the upregulation of oncoprotein Gankyrin. Natural plant active molecules have the potential to interrupt oncogenesis.

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Epigallocatechin-3-gallate (EGCG), a polyphenolic moiety found in green tea extracts, exhibits pleiotropic bioactivities to combat many diseases including neurological ailments. These neurological diseases include Alzheimer's disease, multiple sclerosis, Parkinson's disease, Huntington's disease, and amyotrophic lateral sclerosis. For instance, in the case of Alzheimer's disease, the formation of a β-sheet in the region of the 10th-21st amino acids was significantly reduced in EGCG-induced oligomeric samples of Aβ40.

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  • Rab5B is a monomeric G protein involved in early endocytosis and important signaling pathways, and its dysregulation is linked to various cancers, including leukemia and breast cancer.
  • The research identified eight potential inhibitors of Rab5B using molecular docking techniques, with strychnine showing the highest binding affinity.
  • Key interactions between the inhibitors and Rab5B were driven by Van der Waals forces, and specific amino acids were crucial for binding, indicating a direction for future drug development against Rab5B.
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Cancer is characterized by mutagenic events that lead to disrupted cell signaling and cellular functions. It is one of the leading causes of death worldwide. Literature suggests that pathogens, mainly Helicobacter pylori and Epstein-Barr virus (EBV), have been associated with the etiology of human cancer.

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Epstein-Barr virus (EBV) is known to be associated with several cancers along with neurological modalities like Alzheimer's disease (AD) and multiple sclerosis (MS). Previous study from our group revealed that a 12 amino acid peptide fragment (SYKHVFLSAFVY) of EBV glycoprotein M (gM) exhibits amyloid-like self-aggregative properties. In the current study, we have investigated its effect on Aβ aggregation along with its effect on neural cell immunology and disease markers.

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