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Topic Review
The Antitumor Activity of s-Triazine Derivatives
1,3,5-triazine derivatives, also called s-triazines, are a series of containing-nitrogen heterocyclic compounds that play an important role in anticancer drug design and development. Three s-triazine derivatives, including altretamine, gedatolisib, and enasidenib, have already been approved for refractory ovarian cancer, metastatic breast cancer, and leukemia therapy, respectively, demonstrating that the s-triazine core is a useful scaffold for the discovery of novel anticancer drugs. 
  • 1.2K
  • 30 Aug 2023
Topic Review
Endoscopic Photoacoustic Imaging
Photoacoustic (PA) imaging is able to provide extremely high molecular contrast while maintaining the superior imaging depth of ultrasound (US) imaging. Conventional microscopic PA imaging has limited access to deeper tissue due to strong light scattering and attenuation. Endoscopic PA technology enables direct delivery of excitation light into the interior of a hollow organ or cavity of the body for functional and molecular PA imaging of target tissue.
  • 1.2K
  • 16 Aug 2021
Topic Review
Current Challenges of iPSC-Based Disease Modeling
Induced pluripotent stem cell (iPSC)-based disease modelling and the cell replacement therapy approach have proven to be very powerful and instrumental in biomedical research and personalized regenerative medicine as evidenced in the past decade by unraveling novel pathological mechanisms of a multitude of monogenic diseases at the cellular level and the ongoing and emerging clinical trials with iPSC-derived cell products. iPSC-based disease modelling has sparked widespread enthusiasm and has presented an unprecedented opportunity in high throughput drug discovery platforms and safety pharmacology in association with three-dimensional multicellular organoids such as personalized organs-on-chips, gene/base editing, artificial intelligence and high throughput “omics” methodologies. 
  • 1.2K
  • 27 Apr 2022
Topic Review
D-Serine and D-Aspartate in the Pathogenesis of Schizophrenia
Schizophrenia (Sch) is a severe and widespread mental disorder. Antipsychotics (APs) of the first and new generations as the first-line treatment of Sch are not effective in about a third of cases and are also unable to treat negative symptoms and cognitive deficits of schizophrenics. This explains the search for new therapeutic strategies for a disease-modifying therapy for treatment-resistant Sch (TRS). Biological compounds are of great interest to researchers and clinicians, among which D-Serine (D-Ser) and D-Aspartate (D-Asp) are among the promising ones. The Sch glutamate theory suggests that neurotransmission dysfunction caused by glutamate N-methyl-D-aspartate receptors (NMDARs) may represent a primary deficiency in this mental disorder and play an important role in the development of TRS. D-Ser and D-Asp are direct NMDAR agonists and may be involved in modulating the functional activity of dopaminergic neurons.
  • 1.2K
  • 07 Dec 2022
Topic Review
Diabetic Foot Ulcers: Promising Biomaterials for Wound Dressings
Diabetic Foot Ulcers (DFUs) are deep tissue lesions on the lower extremities, mainly associated with sustained hyperglycemia, peripheral neuropathy, and peripheral arterial disease (PAD). Globally, a lower limb is amputated every 20 to 30 s, with DFU being responsible for 85 to 95% of cases. Furthermore, individuals with DFUs typically display an increased risk of mortality, more than the double risk of those with DM without a DFU.
  • 1.2K
  • 25 Jun 2023
Topic Review
Metformin’s Mechanism of Action
Metformin is the leading drug for treating type 2 diabetics, but the mechanism of action of metformin, despite some suggested mechanisms such as the activation of the AMP-kinase, is largely unknown. Among its many positive effects are the reduction of blood glucose levels, the inhibition of cyclic AMP synthesis, gluconeogenesis and an increase in sensitivity to insulin. Recent studies have described the natural antagonist of cyclic AMP, prostaglandylinositol cyclic phosphate. The parallels between the beneficial effects of metformin and the regulations triggered by cyclic PIP suggest that the mechanism of action of this key drug may well be explained by its stimulation of the synthesis of prostaglandylinositol cyclic phosphate (cyclic PIP).
  • 1.2K
  • 03 Mar 2022
Topic Review
MEG3 in Carcinogenesis of Heavy Metals
Maternally expressed gene 3 (MEG3), a long non-coding RNAs (lncRNA), functions as a tumor suppressor. MEG3 regulates cell proliferation, cell cycle, apoptosis, hypoxia, autophagy, and many other processes involved in tumor development. MEG3 is downregulated in various cancer cell lines and primary human cancers. Heavy metals, such as hexavalent chromium (Cr(VI)), arsenic, nickel, and cadmium, are confirmed human carcinogens. The exposure of cells to these metals causes a variety of cancers. Most heavy metals are toxic and carcinogenic to humans. Heavy metals are widely utilized in various industrial and agricultural products, such as paints, batteries, pigments, electronic waste, and insecticides/pesticides. Contaminated heavy metals in the environment flow into soil, lake, river, and ocean through rain and groundwater, where the metals accumulate via the circulating bio-system, resulting in high concentrations in humans. Chromium (Cr(VI)), arsenic (As), nickel (Ni), and cadmium (Cd) are listed as Group 1 human carcinogens by the International Agency for Research on Cancer (IARC). Studies have indicated that exposure to these metals disrupts cellular signaling pathways, such as damaged repair processes, reduced gene expression of tumor suppressors, and aberrant metabolism, leading to carcinogenesis.
  • 1.2K
  • 27 Feb 2023
Topic Review
Collagen Hydrolysates
Collagen hydrolysates (CHs) are products with low molecular weight (MW) peptides, and are a result of industrialized processed collagen. Collagen extraction is often a by-product of the meat industry, with the main source for collagen-based products being bovine, although it can also be obtained from porcine and piscine sources. CHs have demonstrated positive results in clinical trials related to joint health, such as decreased joint pain, increased mobility, and structural joint improvements. The bioactivity of CHs is primarily attributed to their bioactive peptide (BAP) content. However, there are significant knowledge gaps regarding the digestion, bioavailability, and bioactivity of CH-derived BAPs, and how different CH products compare in that regard. 
  • 1.2K
  • 14 Sep 2023
Topic Review
Insulin and the HPA-Axis in the Metabolic Syndrome
Emerging data suggest that chromic hyperinsulinemia is also a driving force for increased activation of the hypothalamic-adrenal-pituitary (HPA) axis in subjects with the metabolic syndrome, leading to a state of “functional hypercortisolism”. This “functional hypercortisolism” by antagonizing insulin actions may prevent hypoglycemia. It also disturbs energy balance by shifting energy fluxes away from muscles toward abdominal fat stores. Synergistic effects of hyperinsulinemia and “functional hypercortisolism” promote abdominal visceral obesity and insulin resistance which are core pathophysiological components of the metabolic syndrome. It is hypothesized that hyperinsulinemia-induced increased activation of the HPA axis plays an important etiological role in the development of the metabolic syndrome and its consequences. Numerous studies have demonstrated reversibility of hyperinsulinemia with lifestyle, surgical, and pharmaceutical-based therapies. Longitudinal studies should be performed to investigate whether strategies that reduce hyperinsulinemia at an early stage are successfully in preventing increased activation of the HPA axis and the metabolic syndrome.
  • 1.2K
  • 30 Aug 2022
Topic Review
Metals in Alzheimer’s Disease
Alzheimer’s disease (AD) is the most common cause of dementia worldwide (60–70% of cases), affecting over 55 million people. The role of metals in the pathogenesis of AD is still debated. Although previous research has linked changes in essential metal homeostasis and exposure to environmental heavy metals to the pathogenesis of AD, more research is needed to determine the relationship between metals and AD.
  • 1.2K
  • 06 May 2023
Topic Review
Cell Biology and Immune Functions of the MSC
The acronym mesenchymal stem cells (MSCs) refers either to: Mesenchymal Stem Cell, a term popularized by Caplan in the 1990s and broadly used after that, or Multipotent Mesenchymal Stromal Cell, which is the terminology promoted by Mesenchymal and Tissue Stem Cell Committee of the International Society of Cell Therapy. Mesenchymal stem cells (MSCs) are a subset of non-hematopoietic stem cells found at low frequency, mainly located around vessels (hence also named pericytes) in resting conditions but with high proliferation and multilineage differentiation capacities to orchestrate tissue repair mechanisms.
  • 1.2K
  • 28 Jul 2022
Topic Review
Mechanisms of Diet-Induced Thermogenesis
Brown adipose tissue (BAT) has been considered a vital organ in response to non-shivering adaptive thermogenesis, which could be activated during cold exposure through the sympathetic nervous system (SNS) or under postprandial conditions contributing to diet-induced thermogenesis (DIT). Humans prefer to live within their thermal comfort or neutral zone with minimal energy expenditure created by wearing clothing, making shelters, or using an air conditioner to regulate their ambient temperature; thereby, DIT would become an important mechanism to counter-regulate energy intake and lipid accumulation. In addition, there has been a long interest in the intriguing possibility that a defect in DIT predisposes one to obesity and other metabolic diseases. 
  • 1.2K
  • 24 Oct 2022
Topic Review
CXCL1 in Noncancer Diseases of the Cardiovascular System
CXC motif chemokine ligand 1 (CXCL1), a cytokine belonging to the CXC sub-family of chemokines with CXC motif chemokine receptor 2 (CXCR2) as its main receptor, causes the migration and infiltration of neutrophils to the sites of high expression. This implicates CXCL1 in many adverse conditions associated with inflammation and the accumulation of neutrophils. Herein, the significance of CXCL1 in selected diseases of the cardiovascular system is described.
  • 1.2K
  • 29 Dec 2022
Topic Review
Lipoxygenases and Arachidonic Acid in Glioblastoma Multiforme
Glioblastoma multiforme is a brain tumor with a very unfavorable prognosis, where the vast majority of patients do not survive a year after diagnosis. Arachidonic acid ARA C20:4n-6 in humans is not synthesized de novo but from linoleic acid C18:2n-6 in the polyunsaturated fatty acid (PUFA) biosynthesis pathway. In addition to the cyclooxygenases (COX) pathway, PUFA can be transformed with lipoxygenases (LOX). These enzymes exhibit dioxygenase activity, catalyzing the insertion of a hydroperoxyl group into a PUFA, most commonly ARA 20:4n-6.
  • 1.2K
  • 10 Feb 2023
Topic Review
Nickel Nanoparticles
Methicillin-resistant Staphylococcus aureus (MRSA) has evolved vast antibiotic resistance. These strains contain numerous virulence factors facilitating the development of severe infections. Considering the costs, side effects, and time duration needed for the synthesis of novel drugs, seeking efficient alternative approaches for the eradication of drug-resistant bacterial agents seems to be an unmet requirement. Nickel nanoparticles (NiNPs) have been applied as prognostic and therapeutic cheap agents to various aspects of biomedical sciences. Their antibacterial effects are exerted via the disruption of the cell membrane, the deformation of proteins, and the inhibition of DNA replication. NiNPs proper traits include high-level chemical stability and binding affinity, ferromagnetic properties, ecofriendliness, and cost-effectiveness. They have outlined pleomorphic and cubic structures. The combined application of NiNPs with CuO, ZnO, and CdO has enhanced their anti-MRSA effects. The NiNPs at an approximate size of around 50 nm have exerted efficient anti-MRSA effects, particularly at higher concentrations. NiNPs have conferred higher antibacterial effects against MRSA than other nosocomial bacterial pathogens. The application of green synthesis and low-cost materials such as albumin and chitosan enhance the efficacy of NPs for therapeutic purposes.
  • 1.2K
  • 20 Sep 2022
Topic Review
Immunotherapy in ACC
Adrenocortical carcinoma (ACC) is a rare cancer of the adrenal gland that is frequently associated with excess production of adrenal hormones. Although surgical resection may be curative in early-stage disease, few effective therapeutic options exist in the inoperable advanced or metastatic setting. Immunotherapies, inclusive of a broad array of immune-activating and immune-modulating antineoplastic agents, have demonstrated clinical benefit in a wide range of solid and hematologic malignancies. Immunotherapies that have been evaluated in clinical trials for ACC include the immune checkpoint inhibitors pembrolizumab, nivolumab, and avelumab. Other immunotherapies that have been evaluated include the monoclonal antibodies figitumumab and cixutumumab directed against the ACC-expressed insulin-like growth factor 1 (IGF-1) receptor, the recombinant cytotoxin interleukin-13-pseudomonas exotoxin A, and autologous tumor lysate dendritic cell vaccine.
  • 1.2K
  • 08 Jun 2021
Topic Review
Macrocyclic Receptors
An important direction in the design of tetrapyrrole macrocyclic receptors for a certain substrate type is modification of the macrocycle periphery with bulky substituents or molecular fragments of different natures. Bulky highly-branched lateral substituents are capable of forming additional complexing cavities that can be used for identification and selective binding of substrates of a certain type.
  • 1.2K
  • 14 Sep 2021
Topic Review
Pituitary Apoplexy
Pituitary apoplexy is a rare syndrome, graded from asymptomatic subclinical apoplexy to a life-threatening condition due to pituitary ischemia or haemorrhage of an enlarged pituitary gland. The risk factors and the molecular underlying mechanisms are yet to be elucidated. 
  • 1.2K
  • 26 Aug 2022
Topic Review
Nanoparticle Features That Impact Liver-Targeting and Tolerogenic Effects
Liver-targeting nanoparticles have emerged as a promising platform for the induction of immune tolerance by taking advantage of the liver’s unique tolerogenic properties and nanoparticles’ physicochemical flexibility. Such an approach provides a versatile solution to the treatment of a diversity of immunologic diseases.
  • 1.2K
  • 05 Jan 2024
Topic Review
Virtual Reality in the Rehabilitation
Over the past two decades, virtual reality technology (VRT)-based rehabilitation has been increasingly examined and applied to assist patient recovery in the physical and cognitive domains. The advantages of the use of VRT in the neurorehabilitation field consist of the possibility of training an impaired function as a way to stimulate neuron reorganization (to maximize motor learning and neuroplasticity) and restoring and regaining functions and abilities by interacting with a safe and nonthreatening yet realistic virtual reality environment (VRE). Furthermore, VREs can be tailored to patient needs and provide personalized feedback on performance. VREs may also support cognitive training and increases patient motivation and enjoyment. Despite these potential advantages, there are inconclusive data about the usefulness of VRT in neurorehabilitation settings, and some issues on feasibility and safety remain to be ascertained for some neurological populations.
  • 1.2K
  • 07 May 2021
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