Evidence of curcumin and curcumin analogue effects in skin diseases: A narrative review

Regulatory effect of curcumin on CD40:CD40L interaction and therapeutic implications

Natural compounds have garnered significant attention as potential therapeutic agents due to their inherent properties. Their notable qualities, including safety, efficacy, favorable pharmacokinetic properties, and heightened effectiveness against certain diseases, particularly inflammatory conditions, make them particularly appealing. Among these compounds, curcumin has attracted considerable interest for its unique therapeutic properties and has therefore been extensively studied as a potential therapeutic agent for treating various diseases. Curcumin exhibits diverse anti-inflammatory, antioxidant, and antimicrobial effects. Curcumin's immune system regulatory ability has made it a promising compound for treatment of various inflammatory diseases, such as psoriasis, atherosclerosis, asthma, colitis, IBD, and arthritis. Among the signaling pathways implicated in these conditions, the CD40 receptor together with its ligand, CD40L, are recognized as central players. Studies have demonstrated that the interaction between CD40 and CD40L interaction acts as the primary mediator of the immune response in inflammatory diseases. Numerous studies have explored the impact of curcumin on the CD40:CD40L pathway, highlighting its regulatory effects on this inflammatory pathway and its potential therapeutic use in related inflammatory conditions. In this review, we will consider the evidence concerning curcumin's modulatory effects in inflammatory disease and its potential therapeutic role in regulating the CD40:CD40L pathway.

Microfluidic synthesis of stable and uniform curcumin-loaded solid lipid nanoparticles with high encapsulation efficiency

Solid Lipid Nanoparticles (SLNs) are a suitable method for encapsulating poorly soluble curcumin by dispersing the drug in solid lipids. However, the commonly used bulk method has disadvantages such as low reproducibility and encapsulation efficiency. To overcome these issues, we used a microfluidic machine to achieve more uniform mixing, resulting in an encapsulation efficiency of over 60%. The synthesized SLNs released over approximately six days and demonstrated colloidal stability for two weeks without aggregation. To synthesize the SLNs, we equipped the microfluidic machine with a temperature controller, which enabled the large-scale production of more reproducible and stable SLNs compared to those synthesized using the existing microfluidic machines.

Targeting mTOR with curcumin: therapeutic implications for complex diseases

The mammalian target of rapamycin (mTOR) is a crucial enzyme in regulating multiple signaling pathways in the body, including autophagy, proliferation and apoptosis. Disruption of these mTOR signaling pathways can lead to an array of abnormalities and trigger disease processes, examples being neurodegenerative conditions, cancer, obesity and diabetes. Under conditions of oxidative stress, mTOR can regulate apoptosis and autophagy, with tissue repair being favored under such circumstances. Moreover, the correlation between mTOR and other signaling pathways could play a pivotal role in the pathophysiology of numerous disorders. mTOR has a tight connection with NF-κB, Akt, PI3K, MAPK, GSK-3β, Nrf2/HO-1, JAK/STAT, CREB/BDNF, and ERK1/2 pathways, which together could play significant roles in the regulation of inflammation, apoptosis, cell survival, and oxidative stress in different body organs. Research suggests that inhibiting mTOR could be beneficial in treating metabolic, neurological and cardiovascular conditions, as well as potentially extending life expectancy. Therefore, identifying new chemicals and agents that can modulate the mTOR signaling pathway holds promise for treating and preventing these disorders. Curcumin is one such agent that has demonstrated regulatory effects on the mTOR pathway, making it an exciting alternative for reducing complications associated with complex diseases by targeting mTOR. This review aims to examine the potential of curcumin in modulating the mTOR signaling pathway and its therapeutic implications.

The Effects of Curcuminoids Supplementation on Serum Adipokines: An Umbrella Review of Meta-Analyses of Randomized Controlled Trials

This umbrella review of randomized clinical trials aims to provide a unique and detailed understanding of curcumin's effects on adipokines, adding a novel perspective to the existing body of research. We carried out a thorough search of international databases up to April 2024, including MEDLINE, SciVerse Scopus, and Clarivate Analytics Web of Science. A random-effects model was utilized to evaluate the impact of curcuminoid on adipokines. The umbrella review incorporated meta-analyses that examined the effects of curcuminoid supplementation on adipokines, presenting associated effect sizes (ES) and confidence intervals (CI). We applied the GRADE and AMSTAR (A Tool for Assessing the Risk of Bias in Systematic Reviews system) to assess the certainty of the evidence and the quality of the systematic reviews. Our analysis of one meta-analysis, including 14 RCTs plus 1 RCT not included in meta-analyses, revealed significant and impactful findings. We found a substantial increase in serum adiponectin levels with curcuminoid supplementation, indicating a positive effect (SMD: 0.9; 95% CI, 0.4 to 1.3, p < 0.001; I2 = 92.2%). However, we did not observe a significant impact on serum leptin. The GRADE assessment supports the effect of curcuminoids on adiponectin with moderate evidence, while the impact on leptin was supported by low evidence. Curcuminoid supplementation significantly increases serum adiponectin levels with moderate-quality evidence and has no significant impact on serum leptin. This provides evidence as to the safety and effectiveness of curcuminoids in enhancing adiponectin without adverse effects, reassuring the audience about their potential in adipokine research.

CUR-PDT induces ferroptosis of RA-FLS via the Nrf2/xCT/GPX4 pathway to inhibit proliferation in rheumatoid arthritis

OBJECTIVE

Ferroptosis is a non-apoptotic cell death mechanism driven by reactive oxygen species (ROS) and iron. Its significance in inflammatory arthritis is well-established, but its role in rheumatoid arthritis (RA) remains uncertain. This study aimed to clarify the mechanisms through which curcumin-mediated photodynamic therapy (CUR-PDT) triggers ferroptosis in RA fibroblast-like synoviocytes (FLSs).

METHODS

In vivo studies using a collagen-induced arthritis (CIA) rat model evaluated CUR-PDT effects on joint edema, synovial inflammation, and fibrosis through paw volume measurements and H&E and Masson's trichrome staining. The expression of Nrf2, xCT, and GPX4 in FLSs was assessed via ELISA and immunohistochemistry. In vitro, MH7A cells treated with TNF-α were analyzed for viability, proliferation, invasion, and migration through various assays. Mitochondrial potential and morphology were examined using JC-1 staining and transmission electron microscopy (TEM). Ferroptosis biomarkers, including ROS, malondialdehyde (MDA), glutathione (GSH), superoxide dismutase (SOD), and Fe2+ levels, were measured. Nrf2, xCT, and GPX4 levels were quantified with RT-qPCR, Western blot, and immunofluorescence. Small interfering RNA (siRNA) was employed to knock down Nrf2 to validate the effect of CUR-PDT on ferroptosis in RA-FLS.

RESULTS

The CUR-PDT therapy markedly reduced joint inflammation and collagen deposition in the synovial tissue of CIA rats. It effectively alleviated both inflammation and hyperplasia. Moreover, this therapy facilitated ferroptosis within the synovial tissue. In vitro analyses indicated that CUR-PDT diminished the proliferation and viability of FLSs, resulting in increased ROS levels in the cells. This cascade initiated ferroptosis, as evidenced by decreased glutathione, heightened iron concentrations, mitochondrial shrinkage, and reduced mitochondrial membrane potential. Crucially, the expression of xCT and GPX4 was significantly lowered. Interestingly, knocking down the Nrf2 gene amplified this effect, leading to an even greater reduction in xCT and GPX4 expression. In this context, RA-FLSs exhibited more pronounced ferroptotic traits, including diminished proliferation, invasion, and migration.

CONCLUSIONS

This study elucidated a mechanism by which CUR-PDT triggers ferroptosis in FLSs through the downregulation of the Nrf2-xCT-GPX4 signaling cascade, thereby effectively hindering the progression of RA and emphasizing the importance of targeting Nrf2 in disease advancement.

Nanostructured Strategies for Melanoma Treatment-Part I: Design and Optimization of Curcumin-Loaded Micelles for Enhanced Anticancer Activity

Background/Objectives: Melanoma is a pathology that affects a large part of the population, and the currently available therapies have many limitations, including the selective targeting of the site of action. This study explores the development of curcumin (CUR)-loaded nanostructured delivery systems for topical melanoma treatment, addressing CUR's limitations in bioavailability, solubility, and stability. Methods: Binary surfactant mixtures of Vitamin E-TPGS (TPGS) and Kolliphor ELP (ELP) were selected to form stable micelles for curcumin encapsulation. A Design of Experiments (DoE) approach was applied to optimize the surfactant ratios for enhanced drug solubilization and improved cytotoxic effects on melanoma cells. The final formulation was characterized using Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), and Nuclear Magnetic Resonance (NMR) spectroscopy to confirm its properties. Results: The final formulation, TPGS30ELP15, contained 30 mM TPGS and 15 mM ELP and led to formation of nanostructures of the expected size (hydrodinamic diameter, Dh: 13.11 ± 0.01 nm; polydispersivity index, PDI = 0.371 ± 0.05), able to solubilize 5.51 ± 1.09 mM CUR. The formulation was stable for a 120-day period stored at 4 °C and room temperature in the dark. Cytotoxicity testing in A375 melanoma cells demonstrated that curcumin-loaded micelles significantly reduced cell viability compared to free curcumin. Long-term exposure (24 h) revealed that free curcumin caused an 85% reduction in cell viability, while TPGS30ELP15 resulted in a 70% reduction. Additionally, free curcumin induced a 30% increase in cytoplasmic area, indicating necrosis, whereas TPGS30ELP15 decreased the cytoplasmic area by 20%, suggesting apoptosis. Conclusions: This study demonstrates that TPGS30ELP15 nanomicelles enhance curcumin's anticancer effects while promoting apoptosis and minimizing necrosis, which is associated with lower inflammation and tissue damage. These findings suggest that TPGS30ELP15 offers a more favorable therapeutic profile for melanoma treatment, paving the way for safer and more effective topical therapies.

3D bioprinted poly(lactic acid) scaffolds infused with curcumin-loaded nanostructured lipid carriers: a promising approach for skin regeneration

Nanotechnology and 3D bioprinted scaffolds are revolutionizing the field of wound healing and skin regeneration. By facilitating proper cellular movement and providing a customizable structure that replicates the extracellular matrix, such technologies not only expedite the healing process but also ensure the seamless integration of new skin layers, enhancing tissue repair and promoting overall cell growth. This study centres on the creation and assessment of a nanostructured lipid carrier containing curcumin (CNLC), which is integrated into a 3D bioprinted PLA scaffold system. The goal is to investigate its potential as a vehicle for delivering poorly soluble curcumin for enhanced wound healing. The developed CNLC exhibited an oval morphology and average particle size of 292 nm. The entrapment efficiency (EE) was 81.37 ± 0.85%, and the drug loading capacity was 6.59 ± 1.61%. CNLC was then integrated into PLA-based 3D bioprinted scaffolds, and physicochemical analyses were conducted to evaluate their properties. Cell viability studies carried out using fibroblast cells demonstrated that the PLA/CNLC scaffolds are non-cytotoxic. In vivo experiments showed that the PLA/CNLC scaffolds exhibited complete wound contraction and closure of full-thickness wounds within a period of 21 days. The findings confirmed the scaffold's capacity as a tool for accelerating wound healing. The research emphasises the need for using biomimetic 3D printed scaffold materials and the promise of nanobiotechnology in enhancing treatment efficacy.

Curcumin Microemulsions: Influence of Compositions on the Dermal Penetration Efficacy

Background/Objective: This study provided a comparison of the influence of each component of the microemulsion formulation and investigated the impact of varying concentrations of the microemulsion components on curcumin's ability to penetrate the skin using an ex vivo porcine ear model. Methods: Curcumin microemulsions with different compositions were prepared and analyzed for their physicochemical properties. The dermal penetration efficacy of curcumin was evaluated from the different formulations and compared with non-microemulsion formulations. Results: Findings proved that microemulsion formulations improve the dermal penetration efficacy for curcumin when compared with non-microemulsion formulations. The composition of the microemulsion affects the penetration efficacy of curcumin and increases with decreasing oil content and increasing surfactant and water content. The best penetration for curcumin is achieved with a microemulsion that contained 7.7 g of medium-chain triglycerides as the oil phase, 6.92 g of Tween® 80 and 62.28 g of ethanol as the surfactant mixture, and 23.1 g water. Conclusions: The present study provides a foundational basis for further development of different microemulsion formulations for enhancing the dermal penetration of poorly water-soluble active compounds.

Curcuminoids as natural modulators of necroptosis: therapeutic implications

Necroptosis is an emerging form of programmed cell death characterized by necrosis, an inflammatory type of cell death. Necroptosis is primarily initiated by specific mediators that interact with receptor proteins, leading to the activation of protein kinases RIPK1 and RIPK3. These kinases transmit death signals and recruit and phosphorylate mixed lineage kinase domain-like protein (MLKL), which ultimately triggers cell death and necroptosis. Curcuminoids, natural compounds derived from turmeric, have been shown to possess various therapeutic benefits, including neuroprotective, anti-metabolic syndrome, anti-inflammatory, and anti-cancer effects. In this concise overview, we aim to explore the relationship between curcuminoids and the molecular mechanisms of the necroptosis pathway based on recent in vivo and in vitro studies. The available literature indicates that curcuminoids, mainly curcumin, can act as inhibitors of necroptosis in tissue damage scenarios while serving as a necroptosis inducer in cancer cells. Curcuminoids significantly influence key indicators of necroptosis, highlighting their potential to enhance disease treatment. Future studies should focus on further investigating this important component of turmeric to advance therapeutic approaches.

Harnessing the therapeutic potential of phytochemicals in neuroblastoma

Neuroblastomas are the most common solid tumors outside of the brain that originate from immature neural crest cells, accounting for about 10% of all pediatric malignancies. The treatment for neuroblastomas involves a multimodal schedule, including surgery, radiation, chemotherapy, and immunotherapy. All these modalities are limited by side effects that might be severe, poor prognosis, and a high risk of recurrence. In the quest for additional therapeutic approaches, phytochemicals have attracted attention owing to their reported antitumor properties, safety, and multimechanistic mode of action. Several studies have used plant-derived bioactive compounds such as phenolics and flavonoids, suggesting modulation of biomolecules and signal transduction pathways involved in neuroblastoma. We reviewed the findings of recent preclinical and clinical studies demonstrating the effects of phytochemicals on neuroblastoma, shedding light on their molecular mechanism of action and potential therapeutic applications.

Characterization, adsorption kinetic and in vitro release behavior of curcumin loaded with porous mannitol and porous lactose: Template agent method vs. Pore-forming agent method

Polyvinylpyrrolidone K30 was used as the templating agent, and ammonium bicarbonate was used as the pore-forming agent to make porous mannitol and porous lactose by the template and pore-forming agent method, respectively. Compared with the template method, the porous particles prepared by the pore-forming agent method have larger pore diameter (320.276 nm and 250.528 nm) and specific surface area (1.018 m2/g and 0.913 m2/g). The molecular docking results showed that mannitol/lactose interacted with curcumin and adhered to each other through hydrogen bonding. The adsorption kinetics process of porous mannitol and porous lactose prepared by template agent, pore-forming agent and curcumin were different. Among the curcumin-loaded porous particles prepared by the two methods, the curcumin-loaded porous lactose prepared by the pore-forming agent method had the fastest release rate and the highest cumulative release rate (95 %). Curcumin releases consistent with the Peppas release kinetics model and the diffusion mechanism.

Comparative Study of Liposomal and Ethosomal Formulations of Curcuma heyneana Rhizome Extract in a Transdermal Delivery System

AIMS

This study aimed to develop an anti-aging nanoformulation with Curcuma heyneana extract as bioactive substance.

BACKGROUND

Curcuma heyneana Valeton & Zipj extract has been proven in previous research to have antioxidant, anti-ageing, anti-inflammatory, and wound healing properties, which makes it a potential bioactive material for anti-ageing and sunscreen cosmetic products. Phytoantioxidants need to penetrate into deeper skin layers to ensure effectivity. Thus, a transdermal delivery system is needed to deliver the extract to a deeper skin layer.

OBJECTIVES

The objective of the study was to compare the permeability and anti-ageing activity of liposomal and ethosomal formulations of C. heynena rhizome ethanolic extract.

METHODS

In this study, C. heyneana extract was loaded into a phospholipid vesicular system in the form of liposome and ethosome formulations using the ethanolic injection method. The anti-ageing activity was assessed by analyzing the epidermal thickness, number of sunburn cells, distance between collagen fibers, and number of fibroblasts. While the histologic specimen scoring was carried out for the in vivo penetration study.

RESULTS

The ethosomal formulation had been found to have better penetration ability since it was able to reach the lower dermis area compared to the liposomes, which only reached the upper dermis. The ethosomal formulation of C. heyneana extract exhibited a better anti-ageing activity based on the parameters of epidermal thickness, sunburn cell count, fibroblast count, and the distance between collagen fibres in rat skin histology.

CONCLUSION

Ethosomes have been found to be a more proficient carrier system for transdermal delivery of C. heyneana extract compared to liposomes. Meanwhile, their penetration correlated with the effectivity of the formulation, suggesting that the vesicular system enhanced the penetration ability of the extract.

Modulation of the ubiquitin-proteasome system by curcumin: Therapeutic implications in cancer

By the ubiquitin-proteasomes, cellular proteins are structurally degraded and turnover. Many essential functions and regulations of cells are regulated and controlled by these proteins. Recent studies indicated that many cancer types have been associated with aberrations in the ubiquitination pathway, which involves three enzymatic steps. Dietary phytochemicals have been identified as having the potential to inhibit carcinogenesis recently. As part of this group of phytochemicals, curcumin can play a crucial role in suppressing carcinogenesis by changing many reactions affected by the ubiquitin-proteasome pathway. Due to its ability to change some biological processes such as NF-κB, inhibit some cyclins, and induce apoptosis, it can be used as a drug in cancer treatment.

The analgesic effect of curcumin and nano-curcumin in clinical and preclinical studies: a systematic review and meta-analysis

Chronic pain remains a treatment challenge. Curcumin, a natural plant product found in the Curcuma genus, has been shown to possess anti-inflammatory, antioxidant, and neuroprotective properties. In this systematic review and meta-analysis, we aimed to evaluate the efficacy of curcumin and nano-curcumin for treating chronic pain in clinical and preclinical studies. A systematic search was performed through PubMed, SCOPUS, Web of Science Core Collection, Cochrane, and Google Scholar up to April 1, 2023, using relevant keywords. Trials that met the inclusion criteria were included in this study. We applied the mean difference (MD) or standardized mean difference (SMD) in random or fixed-effects models to analyze the impact of combined trials. We also evaluated the potential risk of bias using the Higgins method for clinical studies and the SYRCLE Risk of Bias tool for animal studies. Our meta-analysis included 59 studies, comprising 29 animal studies and 30 clinical studies. Curcumin strongly reduced pain in preclinical studies, and both the intraperitoneal (SMD = 1.48; 95% CI, 0.81 to 2.14; p < 0.001, and I2 = 77.9%) and oral (SMD = 1.27; 95% CI, 1.01 to 1.55; p < 0.001, and I2 = 0.0%) administration method of curcumin had pain-relieving effects. However, the subcutaneous method (SMD = 0.24; 95% CI, - 0.89 to 1.38; p = 0.67) had no effect. The drug's efficacy within the 100-250 mg range (SMD = 1.46; 95% CI, 0.76 to 2.15; p < 0.001; and I2 = 73.4%) surpassed that observed above 250 mg (SMD = 1.23; 95% CI, 0.89 to 1.57; p < 0.001; and I2 = 0.0%). In clinical studies, nano-curcumin had a powerful effect on pain reduction compared to placebo (MD =  - 1.197; CI 95% (- 1.94 to - 0.45); p = 0.002; and I2 = 80.9%), and the effects of NSAIDs on pain were not significantly altered when used in combination with Curcuma longa extract (MD =  - 0.23; CI 95% (- 0.99 to 0.53); p = 0.554; and I2 = 92%). In addition, the effect of increased bioavailability of curcumin (MD =  - 1.54; CI 95% (- 2.06 to - 1.02); p < 0.001; and I2 = 89.6%), curcumin (MD =  - 1.35; CI 95% (- 2.451 to - 0.252); p = 0.016; and I2 = 90.8%), and nano-curcumin was greater than placebo. Our meta-analysis suggests that curcumin and nano-curcumin are effective in reducing chronic pain. These findings have important implications for pharmaceutical science and may lead to the development of new treatments for chronic pain. However, further research is needed to confirm these findings.

Curcumin-based nanofibers: A promising approach for cancer therapy

Nanofibers are among the promising platforms for efficient delivery of drugs (both hydrophilic and hydrophobic) through harnessing polymers with different natures as their base. Hydrophobic low-solubility agents such as curcumin could be incorporated in various types of electrospun nanofibers for different aims in drug delivery, such as enhancing its solubility, making this agent sustained release with improved pharmacological efficacy. Through using this nanoplatform, curcumin may become more bioavailable and more efficcious in the field of cancer therapy as well as tissue engineering and wound healing for local delivery of this anti-inflammatory and antioxidant agent. In this review, the characteristics of curcumin-loaded nanofibers, their targeting potential or stimuli-responsiveness accompanied with therapeutic anti-cancerous applications of them (mostly in local application) are securitized. These nanofibers follow the aim of enhancing curcumin's therapeutic effectiveness and release profile. We laso elaborate on the mechanisms of action through which curcumin exerts its effect on various cancerous cells after its incorporation in various types of nanofibers which have been prepared by exploiting different polymers.

Advancements in curcumin-loaded PLGA nanoparticle delivery systems: progressive strategies in cancer therapy

Cancer is a leading cause of death worldwide, and imposes a substantial socioeconomic burden with little impact especially on aggressive types of cancer. Conventional therapies have many serious side effects including generalised systemic toxicity which limits their long-term use. Tumour resistance and recurrence is another main problem associated with conventional therapy. Purified or extracted natural products have been investigated as cost-effective cancer chemoprotective agents with the potential to reverse or delaying carcinogenesis. Curcumin (CUR) as a natural polyphenolic component, exhibits many pharmacological activities such as anti-cancer, anti-inflammatory, anti-microbial, activity against neurodegenerative diseases including Alzheimer, antidiabetic activities (type II diabetes), anticoagulant properties, wound healing effects in both preclinical and clinical studies. Despite these effective protective properties, CUR has several limitations, including poor aqueous solubility, low bioavailability, chemical instability, rapid metabolism and a short half-life time. To overcome the pharmaceutical problems associated with free CUR, novel nanomedicine strategies (including polymeric nanoparticles (NPs) such as poly (lactic-co-glycolic acid) (PLGA) NPs have been developed. These formulations have the potential to improve the therapeutic efficacy of curcuminoids. In this review, we comprehensively summarise and discuss recent in vitro and in vivo studies to explore the pharmaceutical significance and clinical benefits of PLGA-NPs delivery system to improve the efficacy of CUR in the treatment of cancer.

Utilizing ionic liquids as eco-friendly and sustainable carriers for delivering nucleic acids: A review on the revolutionary advancement in nano delivery systems

Ionic liquids (ILs) are an extremely versatile class of chemicals. It has been shown that they can effectively pass through many biological barriers in the human body to deliver medications. ILs are solvents noted for their ecological friendliness; they contain equal amounts of cations and anions and remain liquid at temperatures below 100 °C. Hence, these are ideal for biomedical applications owing to their advantageous properties such as biocompatibility, solubility, and adaptability. ILs are widely reported to improve the solubility and stability of nucleic acids (DNA and RNA) in aqueous conditions, allowing for more effective delivery. Certain ILs have shown the ability to enhance the absorption of nucleic acids into cells. In addition, ILs can also be used to create vectors for gene delivery, such as liposomes and nanoparticles, thereby improving the transfection efficiency of plasmid DNA and siRNA. Subsequently, the application of ILs for nucleic acid delivery has increased significantly in recent years. In this context, we believe that using ILs to enhance the transport of nucleic acids will have a considerable effect as a novel and crucial therapeutic method in the upcoming decades. The use of ILs as solvents to preserve the natural structure of DNA and RNA shows promise for a variety of biotechnological and medical applications. Notably, ILs may be utilized for a variety of functions, including extracting, concentrating, stabilizing, and spreading nucleic acids inside cells. Our review emphasizes the key findings of research works published in this domain, wherein outstanding effectiveness of delivering RNA to the desired areas was achieved, and was made possible through the utilization of ILs.

Molecular targets in SARS-CoV-2 infection: An update on repurposed drug candidates

The 2019 widespread contagion of the human coronavirus novel type (SARS-CoV-2) led to a pandemic declaration by the World Health Organization. A daily increase in patient numbers has formed an urgent necessity to find suitable targets and treatment options for the novel coronavirus (COVID-19). Despite scientists' struggles to discover quick treatment solutions, few effective specific drugs are approved to control SARS-CoV-2 infections thoroughly. Drug repositioning or Drug repurposing and target-based approaches are promising strategies for facilitating the drug discovery process. Here, we review current in silico, in vitro, in vivo, and clinical updates regarding proposed drugs for prospective treatment options for COVID-19. Drug targets that can direct pharmaceutical sciences efforts to discover new drugs against SARS-CoV-2 are divided into two categories: Virus-based targets, for example, Spike glycoprotein and Nucleocapsid Protein, and host-based targets, for instance, inflammatory cytokines and cell receptors through which the virus infects the cell. A broad spectrum of drugs has been found to show anti-SARS-CoV-2 potential, including antiviral drugs and monoclonal antibodies, statins, anti-inflammatory agents, and herbal products.

The effect of curcumin-piperine supplementation on lipid profile, glycemic index, inflammation, and blood pressure in patients with type 2 diabetes mellitus and hypertriglyceridemia

Type 2 diabetes mellitus (T2DM) is a metabolic disorder associated with insulin resistance and ensuing dysglycemia, dyslipidemia, and inflammation. Owing to the putative metabolic benefits of curcumin-piperine combination, we explored the efficacy of this combination in improving cardiometabolic indices of patients with T2DM and hypertriglyceridemia. In this double-blind clinical trial, 72 patients with T2DM and hypertriglyceridemia were randomized to receive either a tablet containing 500 mg of curcuminoids plus 5 mg of piperine, or a matched placebo for 12 weeks. Anthropometric indices, blood pressure, glycemic indices, lipid profile, C-reactive protein (CRP), quality of life, and mood were evaluated at baseline and end of the study. After 12 weeks of intervention, the levels of triglycerides (p-value = 0.001) and fasting blood glucose (p-value = 0.004) were significantly reduced in the curcumin-piperine compared with the placebo group. CRP levels were marginally reduced in the curcumin-piperine compared with the placebo group (p-value = 0.081). In addition, energy/fatigue significantly increased in the curcumin-piperine group compared to the control group (p-value = 0.024). However, between-group comparisons showed no significant change in other parameters, including anthropometric indices (waist circumference and body mass index (BMI)), biochemical parameters (low-density lipoprotein (LDL-c), high-density lipoprotein (HDL-c), and insulin), HOMA-IR, blood pressure, quality of life, and DASS-21 items between the studied groups (p-value >0.05). The current study showed that curcumin-piperine supplementation can improve serum CRP, triglycerides, and glucose concentrations in patients with T2DM and hypertriglyceridemia.

Effects of dietary curcumin on gene expression: An analysis of transcriptomic data in mice

BACKGROUND

Curcumin, a ubiquitous polyphenol in turmeric, possesses many anti-cancer and anti-inflammatory properties. These therapeutic effects are largely resultant of curcumin's ability to modulate global gene expression. Bioinformatics-based approaches for analyzing differential gene expression are effective tools in gaining a more profound understanding of the underlying mechanisms of action.

AIM

In this study, we aimed to identify key genes that were differentially regulated by curcumin treatment of mice.

METHODS

We downloaded GSE10684 and GSE13705 microarray profiles from the GEO database. Differentially expressed genes were identified and compared in both data sets. Twenty-seven genes that are significantly differentially regulated in both datasets were considered as key genes.

RESULTS

Gene ontology (GO) enrichment indicates these key genes were mostly enriched in GO Process of regulation of immune response and immune system process. The KEGG pathways of Cytokine-cytokine receptor interaction and TISSUES of Immune system were the top enriched terms of key genes base on strength and false discovery rate. The protein-protein interactions were analyzed by the STRING. PPI clustering showed that cluster 1 with Csf1, Cxcl16, Cxcr3, Fas, Il7r, Rassf2, and Rp2h was the most significant cluster. GO enrichment analysis for this cluster also showed the roles of these genes in immune system regulation.

CONCLUSIONS

Overall, the microarray datasets to identify the key genes and the related pathways which were affected by curcumin treatments show that curcumin has a significant impact on immune system regulation through the modulation of gene expression.

Polymer nanotherapeutics: A promising approach toward microglial inhibition in neurodegenerative diseases

Nanoparticles (NPs) that target multiple transport mechanisms facilitate targeted delivery of active therapeutic agents to the central nervous system (CNS) and improve therapeutic transport and efficacy across the blood-brain barrier (BBB). CNS nanotherapeutics mostly target neurons and endothelial cells, however, microglial immune cells are the first line of defense against neuronal damage and brain infections. Through triggering release of inflammatory cytokines, chemokines and proteases, microglia can however precipitate neurological damage-a significant factor in neurodegenerative diseases. Thus, microglial inhibitory agents are attracting much attention among those researching and developing novel treatments for neurodegenerative disorders. The most established inhibitors of microglia investigated to date are resveratrol, curcumin, quercetin, and minocycline. Thus, there is great interest in developing novel agents that can bypass or easily cross the BBB. One such approach is the use of modified-nanocarriers as, or for, delivery of, therapeutic agents to the brain and wider CNS. For microglial inhibition, polymeric NPs are the preferred vehicles for choice. Here, we summarize the immunologic and neuroinflammatory role of microglia, established microglia inhibitor agents, challenges of CNS drug delivery, and the nanotherapeutics explored for microglia inhibition to date. We also discuss applications of the currently considered "most useful" polymeric NPs for microglial-inhibitor drug delivery in CNS-related diseases.

The beneficial impact of curcumin on cardiac lipotoxicity

Lipotoxicity is defined as a prolonged metabolic imbalance of lipids that results in ectopic fat distribution in peripheral organs such as the liver, heart, and kidney. The harmful consequences of excessive lipid accumulation in cardiomyocytes cause cardiac lipotoxicity, which alters the structure and function of the heart. Obesity and diabetes are linked to lipotoxic cardiomyopathy. These anomalies might be caused by a harmful metabolic shift that accumulates toxic lipids and shifts glucose oxidation to less fatty acid oxidation. Research has linked fatty acids, fatty acyl coenzyme A, diacylglycerol, and ceramide to lipotoxic stress in cells. This stress can be brought on by apoptosis, impaired insulin signaling, endoplasmic reticulum stress, protein kinase C activation, p38 Ras-mitogen-activated protein kinase (MAPK) activation, or modification of peroxisome proliferator-activated receptors (PPARs) family members. Curcuma longa is used to extract curcumin, a hydrophobic polyphenol derivative with a variety of pharmacological characteristics. Throughout the years, curcumin has been utilized as an anti-inflammatory, antioxidant, anticancer, hepatoprotective, cardioprotective, anti-diabetic, and anti-obesity drug. Curcumin reduces cardiac lipotoxicity by inhibiting apoptosis and decreasing the expression of apoptosis-related proteins, reducing the expression of inflammatory cytokines, activating the autophagy signaling pathway, and inhibiting the expression of endoplasmic reticulum stress marker proteins.

Protective Effects of Plant-Derived Compounds Against Traumatic Brain Injury

Inflammation in the nervous system is one of the key features of many neurodegenerative diseases. It is increasingly being identified as a critical pathophysiological primitive mechanism associated with chronic neurodegenerative diseases following traumatic brain injury (TBI). Phytochemicals have a wide range of clinical properties due to their antioxidant and anti-inflammatory effects. Currently, there are few drugs available for the treatment of neurodegenerative diseases other than symptomatic relief. Numerous studies have shown that plant-derived compounds, in particular polyphenols, protect against various neurodegenerative diseases and are safe for consumption. Polyphenols exert protective effects on TBI via restoration of nuclear factor kappa B (NF-κB), toll-like receptor-4 (TLR4), and Nod-like receptor family proteins (NLRPs) pathways. In addition, these phytochemicals and their derivatives upregulate the phosphatidylinositol-3-Kinase/Protein Kinase B (PI3K/AKT) and nuclear factor erythroid 2-related factor 2 (Nrf2) pathways, which have critical functions in modulating TBI symptoms. There is supporting evidence that medicinal plants and phytochemicals are protective in different TBI models, though future clinical trials are needed to clarify the precise mechanisms and functions of different polyphenolic compounds in TBI.

Nanospheres for curcumin delivery as a precision nanomedicine in cancer therapy

Cancer is ranked among the top causes of mortality throughout the world. Conventional therapies are associated with toxicity and undesirable side effects, rendering them unsuitable for prolonged use. Additionally, there is a high occurrence of resistance to anticancer drugs and recurrence in certain circumstances. Hence, it is essential to discover potent anticancer drugs that exhibit specificity and minimal unwanted effects. Curcumin, a polyphenol derivative, is present in the turmeric plant (Curcuma longa L.) and has chemopreventive, anticancer, radio-, and chemo-sensitizing activities. Curcumin exerts its anti-tumor effects on cancer cells by modulating the disrupted cell cycle through p53-dependent, p53-independent, and cyclin-dependent mechanisms. This review provides a summary of the formulations of curcumin based on nanospheres, since there is increasing interest in its medicinal usage for treating malignancies and tumors. Nanospheres are composed of a dense polymeric matrix, and have a size ranging from 10 to 200 nm. Lactic acid polymers, glycolic acid polymers, or mixtures of them, together with poly (methyl methacrylate), are primarily used as matrices in nanospheres. Nanospheres are suitable for local, oral, and systemic delivery due to their minuscule particle size. The majority of nanospheres are created using polymers that are both biocompatible and biodegradable. Previous investigations have shown that the use of a nanosphere delivery method can enhance tumor targeting, therapeutic efficacy, and biocompatibility of different anticancer agents. Moreover, these nanospheres can be easily taken up by mammalian cells. This review discusses the many curcumin nanosphere formulations used in cancer treatment.

A recent update on the connection between dietary phytochemicals and skin cancer: emerging understanding of the molecular mechanism

Constant exposure to harmful substances from both inside and outside the body can mess up the body's natural ways of keeping itself in balance. This can cause severe skin damage, including basal cell carcinoma (BCC), squamous cell carcinoma (SCC), and melanoma. However, plant-derived compounds found in fruits and vegetables have been shown to protect against skin cancer-causing free radicals and other harmful substances. It has been determined that these dietary phytochemicals are effective in preventing skin cancer and are widely available, inexpensive, and well-tolerated. Studies have shown that these phytochemicals possess anti-inflammatory, antioxidant, and antiangiogenic properties that can aid in the prevention of skin cancers. In addition, they influence crucial cellular processes such as angiogenesis and cell cycle control, which can halt the progression of skin cancer. The present paper discusses the benefits of specific dietary phytochemicals found in fruits and vegetables, as well as the signaling pathways they regulate, the molecular mechanisms involved in the prevention of skin cancer, and their drawbacks.

Bioinformatic analysis of the molecular targets of curcumin in colorectal cancer

Colorectal cancer (CRC) is a major global health concern, with rising incidence and mortality rates. Conventional treatments often come with significant complications, prompting the exploration of natural compounds like curcumin as potential therapeutic agents. Using bioinformatic tools, this study investigated the role of curcumin in CRC treatment. Significant protein interactions between curcumin and target proteins were identified in the STITCH database. Differentially expressed genes (DEGs) associated with CRC were then analyzed from GEO databases. Comparing curcumin targets and CRC-related DEGs, nine significant common targets were identified: DNMT1, PCNA, CCND1, PLAU, MMP3, SOX9, FOXM1, CXCL2, and SERPINB5. Pathway enrichment analyses revealed that curcumin-targeted pathways were primarily related to p53, IL-17, NF-kappa B, TNF, and cell cycle signaling, all crucial in CRC development and progression. Further analyses using DAID and EnrichR algorithms showed that the curcumin targets exhibited greater specificity to bronchial epithelial cells and colorectal adenocarcinoma than other diseases. Analyses via the DSigDB database indicated that curcumin ranks highly among other drugs targeting the identified CRC-related genes. Docking studies revealed favorable binding interactions between curcumin and the key CRC-related proteins, suggesting potential molecular mechanisms by which curcumin may exert its effects. In summary, this study provides bioinformatic and docking evidence that curcumin may exert beneficial effects on CRC by modulating the expression or activity of multiple CRC-susceptibility genes involved in critical signaling pathways. These findings warrant further experimental validation and support the potential of curcumin as a therapeutic agent for CRC.

The effectiveness of phytosomal curcumin on clinical and laboratory parameters of patients with multiple trauma admitted to the intensive care unit: a double-blind randomized placebo-controlled trial

BACKGROUND

Multiple trauma has serious complications, which increases the risk of morbidity and mortality in the patients. This study aimed to evaluate the impact of supplementation with phytosomal curcumin on clinical and laboratory factors in critically ill patients with multiple trauma.

METHODS

In this double-blind trial, 53 patients with multiple trauma, who were admitted to the intensive care unit (ICU) were randomized to receive either 2 capsules, each capsule containing 250 mg phytosomal (a total of 500 mg daily) as an intervention group or 2 identical capsules (placebo capsules), each containing 250 mg maltodextrin for 7 days. Clinical and laboratory were parameters assessed before and after the intervention.

RESULTS

After seven days of intervention, the mean increase from baseline in the Glasgow coma scale (GCS) score was significantly higher in the curcumin compared with the placebo group (P-value: 0.028), while the reduction in the APACHE-II score in the curcumin group was greater than that the placebo group in a marginally non-significant fashion (P-value: 0.055). Serum total bilirubin (P-value: 0.036) and quantitative C-reactive protein (CRP) (P-value: 0.044) levels significantly decreased while potassium (P-value: 0.01) significantly increased in the curcumin compared with the placebo group. Moreover, supplementation with phytosomal curcumin significantly increased platelet count (P-value: 0.024) as compared with placebo. The 28-day mortality rate was 7.7% (n: 2 patients) and 3.7% (n: 1 patients) in the placebo and curcumin groups, respectively (P-value > 0.05).

CONCLUSION

Phytosomal curcumin had beneficial effects on several clinical and laboratory factors including GCS, APACHEII, serum total bilirubin, CRP, and platelet count in ICU-admitted patients with multiple trauma.

TRIAL REGISTRATION

IRCT20090306001747N1, Available on: https://www.irct.ir/trial/52692 . The first registration date was 12/01/2021.

Targeting the Akt signaling pathway: Exploiting curcumin's anticancer potential

Cancer is recognized as one of the leading causes of death worldwide. In recent years, advancements in early detection and expanding treatment options have contributed to a decrease in mortality rates. However, the emergence of drug-resistant cancers necessitates the exploration of innovative and more effective drugs. The Akt kinases play a central role in various signaling pathways that regulate crucial cellular processes, including cell growth, proliferation, survival, angiogenesis, and glucose metabolism. Due to frequent disruptions of the Akt signaling pathway in numerous human cancers and its broad biological implications, targeting this pathway has become a key focus in combating tumor aggressiveness and a promising avenue for therapeutic intervention. Curcumin, a compound found in turmeric, has been extensively studied for its potential as an anti-cancer agent. It demonstrates inhibitory effects on cancer initiation, progression, and metastasis by influencing various processes involved in tumor growth and development. These effects are achieved through negative regulation of transcription factors, growth factors, cytokines, protein kinases, and other oncogenic molecules. This review aims to explore curcumin's anticancer activity against different types of cancer mediated via the PI3K/Akt signaling pathway, as well as its practical applications in treatment.

Protective effects of curcumin against spinal cord injury

Background

In parallel with population aging, the prevalence of neurological and neurodegenerative diseases has been dramatically increasing over the past few decades. Neurodegenerative diseases reduce the quality of life of patients and impose a high cost on the health system. These slowly progressive diseases can cause functional, perceptual, and behavioral deficits in patients. Therefore, neurodegenerative impairments have always been an interesting subject for scientists and clinicians. One of these diseases is spinal cord injury (SCI). SCI can lead to irreversible damage and is classified into two main subtypes: traumatic and non-traumatic, each with very different pathophysiological features.

Aims

This review aims to gather relevant information about the beneficial effects of curcumin (Cur), with specific emphasis on its anti-inflammatory properties towards spinal cord injury (SCI) patients.

Materials & Methods

The review collates data from extensive in-vitro, in-vivo, and clinical trials documenting the effects of CUR on SCI. It examines the modulation of pathophysiological pathways and regulation of the inflammatory cascades after CUR administration.

Results

Various pathophysiological processes involving the nuclear factor erythroid 2-related factor 2 (Nrf2), nuclear factor kappa B (NF-kB), and transforming growth factor beta (TGF-β) signaling pathways have been suggested to exacerbate damages resulting from SCI. CUR administration showed to modulate these signaling pathways which lead to attenuation of SCI complications.

Discussion

Anti-inflammatory compounds, particularly CUR, can modulate these pathophysiological pathways and regulate the inflammatory cascades. CUR, a well-known natural product with significant anti-inflammatory effects, has been extensively documented in experimental and clinical trials.

Conclusion

Curcumin's potential to alter key steps in the Nrf2, NF-kB, and TGF-β signaling pathways suggests that it may play a role in attenuating SCI complications.

The role of natural products as PCSK9 modulators: A review

A variety of mechanisms and drugs have been shown to attenuate cardiovascular disease (CVD) onset and/or progression. Recent researchers have identified a potential role of proprotein convertase subtilisin/kexin type 9 (PCSK9) in modulating lipid metabolism and reducing plasma low density lipoprotein (LDL) levels. PCSK9 is the central protein in the metabolism of LDL cholesterol (LDL-C) owing to its major function in LDL receptor (LDLR) degradation. Due to the close correlation of cardiovascular disease with lipid levels, many in vivo and in vitro investigations are currently underway studying the physiological role of PCSK9. Furthermore, many studies are actively investigating the mechanisms of various compounds that influence lipid associated-disorders and their associated cardiovascular diseases. PCSK9 inhibitors have been shown to have significant impact in the prevention of emerging cardiovascular diseases. Natural products can effectively be used as PCSK9 inhibitors to control lipid levels through various mechanisms. In this review, we evaluate the role of phytochemicals and natural products in the regulation of PCSK9, and their ability to prevent cardiovascular diseases. Moreover, we describe their mechanisms of action, which have not to date been delineated.

Evaluation of the effectiveness of curcumin and piperine co-supplementation on inflammatory factors, cardiac biomarkers, atrial fibrillation, and clinical outcomes after coronary artery bypass graft surgery

BACKGROUND

Coronary artery bypass graft (CABG) is one of the preferred treatments for patients with heart problems, especially in individuals with other comorbidities and when multiple arteries are narrowed. This study aimed to assess the effects of administrating curcumin-piperine on patients who underwent CABG surgery.

METHODS

This was a randomized, double-blind, placebo-controlled clinical trial, in which 80 eligible adults who underwent CABG surgery, were randomized into 4 groups. Patients received 3 tablets daily for 5 days after the surgery, which contained curcumin-piperine (each tablet contained 500 mg curcumin +5 mg piperine) or a placebo (each tablet contained 505 mg maltodextrin). Group A received 3 placebo tablets, group B received 2 placebos and one curcumin-piperine tablet, group C received 1 placebo and 2 curcumin-piperine tablets, and group D received 3 curcumin-piperine tablets. Before and after the intervention, C-reactive protein (CRP), total antioxidant capacity (TAC), cardiometabolic factors, clinical outcomes, and 28-day mortality were evaluated.

RESULTS

Between-group analysis showed that CRP significantly decreased (P = 0.028), and TAC significantly increased (P = 0.033) after the intervention (Post hoc analysis showed that for CRP, the difference was between group B and D, and for TAC was between group C and D). Between-group analysis also showed that creatine kinase mono-phosphate (CK-MB) marginally reduced (P = 0.077); however, changes for troponin I (P = 0.692), lactate dehydrogenase (LDH) (P = 0.668), ejection fraction (P = 0.340), and arterial fibrillation (P = 0.99) were not significant. Blood urea nitrogen (P = 0.820) and serum creatinine (P = 0.244) did not show notable changes between groups.

CONCLUSION

Supplementation with curcumin-piperine had a promising effect on serum CRP and TAC. It also had a favorable impact on CK-MB among patients who underwent CABG surgery.

TRIAL REGISTRATION

IRCT20201129049534N4, available on https://en.irct.ir/trial/56930.

Mechanism of antibiotic resistance spread during sub-lethal ozonation of antibiotic-resistant bacteria with different resistance targets

The increase and spread of antibiotic-resistant bacteria (ARB) in aquatic environments and the dissemination of antibiotic resistance genes (ARGs) greatly impact environmental and human health. It is necessary to understand the mechanism of action of ARB and ARGs to formulate measures to solve this problem. This study aimed to determine the mechanism of antibiotic resistance spread during sub-lethal ozonation of ARB with different antibiotic resistance targets, including proteins, cell walls, and cell membranes. ARB conjugation and transformation frequencies increased after exposure to 0-1.0 mg/L ozone for 10 min. During sub-lethal ozonation, compared with control groups not stimulated by ozone, the conjugative transfer frequencies of E. coli DH5α (CTX), E. coli DH5α (MCR), and E. coli DH5α (GEN) increased by 1.35-2.02, 1.13-1.58, and 1.32-2.12 times, respectively; the transformation frequencies of E. coli DH5α (MCR) and E. coli DH5α (GEN) increased by 1.49-3.02 and 1.45-1.92 times, respectively. When target inhibitors were added, the conjugative transfer frequencies of antibiotics targeting cell wall and membrane synthesis decreased 0.59-0.75 and 0.43-0.76 times, respectively, while that for those targeting protein synthesis increased by 1-1.38 times. After inhibitor addition, the transformation frequencies of bacteria resistant to antibiotics targeting the cell membrane and proteins decreased by 0.76-0.89 and 0.69-0.78 times, respectively. Cell morphology, cell membrane permeability, reactive oxygen species, and antioxidant enzymes changed with different ozone concentrations. Expression of most genes related to regulating different antibiotic resistance targets was up-regulated when bacteria were exposed to sub-lethal ozonation, further confirming the target genes playing a crucial role in the inactivation of different target bacteria. These results will help guide the careful utilization of ozonation for bacterial inactivation, providing more detailed reference information for ozonation oxidation treatment of ARB and ARGs in aquatic environments.

Curcumin as a regulator of Th17 cells: Unveiling the mechanisms

Curcumin, a polyphenol natural product derived from turmeric, possesses diverse pharmacological effects due to its interactions with various cells and molecules. Recent studies have highlighted its immunomodulatory properties, including its impact on immune cells and mediators involved in immune responses. Th17 cells play a crucial role in promoting immune responses against extracellular pathogens by recruiting neutrophils and inducing inflammation. These cells produce inflammatory cytokines such as TNF-α, IL-21, IL-17A, IL-23, IL-17F, IL-22, and IL-26. Curcumin has been shown to significantly inhibit the proliferation of Th17 cells and reduce the production of inflammatory cytokines, including TNF-α, IL-22, and IL-17. This review aims to assess the effectiveness of curcumin and its underlying mechanisms in modulating Th17 cells.

Integrating Skincare into Medical Practice

The integration of skincare into medical practice can enhance patient care. Understanding the anatomy and physiology of the skin is the foundation for effective skincare interventions. Genetic and inflammatory conditions play a significant role in aesthetic skin physiology. There are key active ingredients that are pivotal in addressing various skin concerns. Sunscreens provide crucial protection against UV radiation, while pigment control agents such as hydroquinone, kojic acid, and arbutin target the melanin pathway. Exfoliating agents and skin turnover enhancers such as retinoids and hydroxy acids promote skin renewal and rejuvenation. In addition, ingredients such as hyaluronic acid, ceramides, niacinamide, antioxidants, peptides, and botanicals contribute to improving skin quality. Adding skincare to medical practice requires careful product selection, patient education, and marketing strategies.

Harnessing the capacity of phytochemicals to enhance immune checkpoint inhibitor therapy of cancers: A focus on brain malignancies

Brain cancers, particularly glioblastoma multiforme (GBM), are challenging health issues with frequent unmet aspects. Today, discovering safe and effective therapeutic modalities for brain tumors is among the top research interests. Immunotherapy is an emerging area of investigation in cancer treatment. Since immune checkpoints play fundamental roles in repressing anti-cancer immunity, diverse immune checkpoint inhibitors (ICIs) have been developed, and some monoclonal antibodies have been approved clinically for particular cancers; nevertheless, there are significant concerns regarding their efficacy and safety in brain tumors. Among the various tools to modify the immune checkpoints, phytochemicals show good effectiveness and excellent safety, making them suitable candidates for developing better ICIs. Phytochemicals regulate multiple immunological checkpoint-related signaling pathways in cancer biology; however, their efficacy for clinical cancer immunotherapy remains to be established. Here, we discussed the involvement of immune checkpoints in cancer pathology and summarized recent advancements in applying phytochemicals in modulating immune checkpoints in brain tumors to highlight the state-of-the-art and give constructive prospects for future research.

Therapeutic potential of curcumin in autophagy modulation: Insights into the role of transcription factor EB

Transcription factor EB (TFEB) is a basic Helix-Loop-Helix/Leucine Zipper (bHLHZip) class of DNA-binding proteins, which can control the expression of genes included in the autophagy-lysosomal pathway. TFEB regulates the autophagic flux by enhancing lysosome biogenesis, forming autophagosomes, and fusion with lysosomes, thereby facilitating cellular clearance of pathogenic protein structures. Curcumin is a natural polyphenolic molecule with pharmacological properties that make it a potential therapeutic candidate for a wide range of diseases. One of the important curcumin mechanisms of action includes modulation of autophagy through affecting various signaling components such as TFEB. This review discusses in vitro and in vivo evidence on the effects of curcumin on autophagy process via modulating TFEB activity in different disorders.

Exosomes-carried curcumin based on polysaccharide hydrogel promote flap survival

Flap grafting is a common technique used to repair skin defects in orthopedics and plastic and reconstructive surgeries. However, oxidative stress injury caused by ischemia and ischemia-reperfusion injury at the distal end of the skin flap can cause flap necrosis. Curcumin is a natural compound with anti-inflammatory and antioxidant properties that tackle oxidative stress. However, its applicability is limited by its poor water solubility. Exosomes are membranous vesicles that can be loaded with hydrophobic drugs. They are widely studied in drug delivery applications and can be investigated to augment curcumin efficiency. In this study, a self-healing oxidized pullulan polysaccharide-carboxymethylated chitosan composite hydrogel was used as a curcumin-loaded exosome delivery system to evaluate its impact on the viability of skin flaps. The hydrogel exhibited good self-healing properties that allowed the continuous and stable release of drugs. It had anti-inflammatory and antioxidant properties that could reduce oxidative stress damage due to early ischemia and hypoxia of the skin flap in vitro. Moreover, this composite hydrogel attenuated inflammatory responses, promoted angiogenesis, and reduced the distal necrosis of the flap in vivo. Therefore, our hydrogel provides a novel strategy for skin flap graft protection with reduced necrosis and the potential for broad clinical applications.

Modulatory Effects of Phytochemicals on Gut-Brain Axis: Therapeutic Implication

This article explores the potential therapeutic implications of phytochemicals on the gut-brain axis (GBA), which serves as a communication network between the central nervous system and the enteric nervous system. Phytochemicals, which are compounds derived from plants, have been shown to interact with the gut microbiota, immune system, and neurotransmitter systems, thereby influencing brain function. Phytochemicals such as polyphenols, carotenoids, flavonoids, and terpenoids have been identified as having potential therapeutic implications for various neurological disorders. The GBA plays a critical role in the development and progression of various neurological disorders, including Parkinson's disease, multiple sclerosis, depression, anxiety, and autism spectrum disorders. Dysbiosis, or an imbalance in gut microbiota composition, has been associated with a range of neurological disorders, suggesting that modulating the gut microbiota may have potential therapeutic implications for these conditions. Although these findings are promising, further research is needed to elucidate the optimal use of phytochemicals in neurological disorder treatment, as well as their potential interactions with other medications. The literature review search was conducted using predefined search terms such as phytochemicals, gut-brain axis, neurodegenerative, and Parkinson in PubMed, Embase, and the Cochrane library.

Curcumin and Ferroptosis: a Promising Target for Disease Prevention and Treatment

Ferroptosis is a recently identified form of cell death characterized by iron accumulation and lipid peroxidation. Unlike apoptosis, necrosis, and autophagy, ferroptosis operates through a distinct molecular pathway. Curcumin, derived from turmeric rhizomes, is a natural compound with diverse therapeutic benefits, including neuroprotective, anti-metabolic syndrome, anti-inflammatory, and anti-cancer properties. Growing evidence suggests that curcumin possesses both pro-oxidant and antioxidant properties, which can vary depending on the cell type. In this review, we explore the relationship between the effects of curcumin and the molecular mechanisms underlying the ferroptosis signaling pathway, drawing from current in vivo and in vitro research. Curcumin has been found to induce ferroptosis in cancer cells while acting as an inhibitor of ferroptosis in tissue injuries. Notably, curcumin treatment leads to alterations in key ferroptosis markers, underscoring its significant impact on this process. Nonetheless, further research focused on elucidating this important attribute of turmeric is crucial for advancing disease treatment.

An overview of the efficacy of inhaled curcumin: a new mode of administration for an old molecule

INTRODUCTION

Curcumin is a polyphenol with a variety of pharmacological actions. Despite its therapeutic effects and well-known safety profile, the utility of curcumin has been limited due to its deprived physical, chemical, and pharmacokinetic profile resulting from limited solubility, durability, prompt deterioration and pitiable systemic availability. Employment of an amalgamated framework integrating the potential advantages of a nanoscaffold alongside the beneficial traits of inhalational drug delivery system beautifully bringing down the restricting attributes of intended curative interventions and further assures its clinical success.

AREAS COVERED

Current review discussed different application of inhalable nanocurcumin in different medical conditions. Lung diseases have been the prime field in which inhalable nanocurcumin had resulted in significant beneficial effects. Apart from this several lung protective potentials of the inhaled nanocurcumin have been discussed against severe pulmonary disorders such as pulmonary fibrosis, radiation pneumonitis and IUGR induced bronchopulmonary dysplasia. Also, application of the disclosed intervention in the clinical management of COVID-19 and Alzheimer's Disease has been discussed.

EXPERT OPINION

In this portion, the potential of inhalable nanocurcumin in addressing various medical conditions along with ongoing advancements in nanoencapsulation techniques and the existing challenges in transitioning from pre-clinical models to clinical practice has been summarized.

Advancements in Dermatological Applications of Curcumin: Clinical Efficacy and Mechanistic Insights in the Management of Skin Disorders

Curcumin, derived from Curcuma longa (turmeric), exhibits significant potential in dermatology, addressing conditions like atopic dermatitis, psoriasis, chronic wounds, skin cancer, and infections through its anti-inflammatory, antioxidant, anticancer, and antimicrobial properties. This review synthesizes evidence on curcumin's mechanisms, including modulation of immune responses and promotion of wound healing, showcasing its efficacy in reducing inflammation, cytokine levels, and enhancing skin barrier functions. Studies highlight curcumin's ability to selectively target tumor cells, suggesting a multifaceted approach to cancer therapy with minimal side effects. Despite promising therapeutic benefits, challenges remain in bioavailability, potency, and targeted delivery, underscoring the need for further research to optimize dosages, delivery methods, and assess long-term safety. The integration of curcumin into dermatological practice requires a balanced consideration of evidence-based efficacy and safety. Curcumin's comprehensive utility in dermatology, coupled with the necessity for advanced scientific exploration, emphasizes the importance of combining traditional knowledge with contemporary research to improve patient care in dermatology. This approach could significantly enhance outcomes for individuals with skin-related conditions, marking curcumin as a versatile and promising agent in the field.

Plant-Derived Fermented Products: An Interesting Concept for Human Health

The health benefits of fermenting plant-derived products remain an underexplored domain. Plants and other natural products serve as medicinal agents when consumed as part of our diets, and the role of microorganisms in fermentation garners significant scientific interest. The present narrative review investigates the effects of fermentation of substances such as plants, algae, and fungi on their therapeutic and related purposes. Among the microorganisms used in fermentation, lactic acid bacteria are often linked to fermented products, particularly dairy and animal-based ones, and take center stage. These microorganisms are adept at synthesizing vitamins, active peptides, minerals, proteinases, and enzymes. Plant-derived fermented products are a significant source of active peptides, phytochemicals, flavonoids, and bioactive molecules with a profound impact on human health. They exhibit anti-inflammatory, anticarcinogenic, antiatherosclerotic, antidiabetic, antimicrobial, and antioxidant properties, the effects being substantiated by experimental studies. Clinical investigations underscore their effectiveness in managing diverse health conditions. Various studies highlight a synergy between microorganisms and plant-based materials, with fermentation as an innovative method for daily food preparation or a treatment option for specific ailments. These promising findings highlight the need for continued scientific inquiry into the impact of fermentation-derived products in clinical settings. Clinical observations to date have offered valuable insights into health improvement for various disorders. This current narrative review explores the impact of natural and plant-originated fermented products on health and well-being.

Effect of Calebin-A on Critical Genes Related to NAFLD: A Protein-Protein Interaction Network and Molecular Docking Study

Background

Calebin-A is a minor phytoconstituent of turmeric known for its activity against inflammation, oxidative stress, cancerous, and metabolic disorders like Non-alcoholic fatty liver disease(NAFLD). Based on bioinformatic tools. Subsequently, the details of the interaction of critical proteins with Calebin-A were investigated using the molecular docking technique.

Methods

We first probed the intersection of genes/ proteins between NAFLD and Calebin-A through online databases. Besides, we performed an enrichment analysis using the ClueGO plugin to investigate signaling pathways and gene ontology. Next, we evaluate the possible interaction of Calebin-A with significant hub proteins involved in NAFLD through a molecular docking study.

Results

We identified 87 intersection genes Calebin-A targets associated with NAFLD. PPI network analysis introduced 10 hub genes (TP53, TNF, STAT3, HSP90AA1, PTGS2, HDAC6, ABCB1, CCT2, NR1I2, and GUSB). In KEGG enrichment, most were associated with Sphingolipid, vascular endothelial growth factor A (VEGFA), C-type lectin receptor, and mitogen-activated protein kinase (MAPK) signaling pathways. The biological processes described in 87 intersection genes are mostly concerned with regulating the apoptotic process, cytokine production, and intracellular signal transduction. Molecular docking results also directed that Calebin-A had a high affinity to bind hub proteins linked to NAFLD.

Conclusion

Here, we showed that Calebin-A, through its effect on several critical genes/ proteins and pathways, might repress the progression of NAFLD.

Effect of polyphenols against complications of COVID-19: current evidence and potential efficacy

The COVID-19 pandemic that started in 2019 and resulted in significant morbidity and mortality continues to be a significant global health challenge, characterized by inflammation, oxidative stress, and immune system dysfunction.. Developing therapies for preventing or treating COVID-19 remains an important goal for pharmacology and drug development research. Polyphenols are effective against various viral infections and can be extracted and isolated from plants without losing their therapeutic potential. Researchers have developed methods for separating and isolating polyphenols from complex matrices. Polyphenols are effective in treating common viral infections, including COVID-19, and can also boost immunity. Polyphenolic-based antiviral medications can mitigate SARS-CoV-2 enzymes vital to virus replication and infection. Individual polyphenolic triterpenoids, flavonoids, anthraquinonoids, and tannins may also inhibit the SARS-CoV-2 protease. Polyphenol pharmacophore structures identified to date can explain their action and lead to the design of novel anti-COVID-19 compounds. Polyphenol-containing mixtures offer the advantages of a well-recognized safety profile with few known severe side effects. However, studies to date are limited, and further animal studies and randomized controlled trials are needed in future studies. The purpose of this study was to review and present the latest findings on the therapeutic impact of plant-derived polyphenols on COVID-19 infection and its complications. Exploring alternative approaches to traditional therapies could aid in developing novel drugs and remedies against coronavirus infection.

In vitro diffusion of plant phenolics through the skin: A review update

OBJECTIVE

Excessive skin exposure to deleterious environmental variables results in inflammation as well as molecular and cellular impairments that compromise its functionality, aesthetic qualities, and overall well-being. The implementation of topical administration of antioxidants and other compounds as a method for preventing or reversing damage is a rational approach. Numerous phenolic compounds derived from plants have demonstrated capabilities such as scavenging free radicals and promoting tissue healing. However, the primary obstacle lies in effectively delivering these compounds to the specific place on the skin, and accurately forecasting their diffusion through the skin can assist in determining the most effective tactics. Hence, this article provides a comprehensive analysis of recent literature pertaining to the in vitro skin diffusion characteristics of plant phenolics. The aim is to gain a deeper understanding of their behaviour when present in various forms such as solutions, suspensions, and formulations.

METHOD

The data on plant extracts and isolated plant phenolic compounds in vitro skin diffusion assays published over the last six years were compiled and discussed.

RESULTS

Even though the gold standard Franz diffusion cell is the most commonly used in the assessment of in vitro plant phenolic skin diffusion profiles, a plethora of skin models and assay conditions are reported for a variety of compounds and extracts in different vehicles.

CONCLUSION

The presence of numerous models and vehicles poses a challenge in creating correlations among the existing data on plant phenolic compounds. However, it is possible to draw some general conclusions regarding molecular, vehicle, and skin characteristics based on the gathered information.

Effects of curcumin/turmeric supplementation on the liver enzymes, lipid profiles, glycemic index, and anthropometric indices in non-alcoholic fatty liver patients: An umbrella meta-analysis

Non-alcoholic fatty liver disease (NAFLD) is one of the leading causes of chronic liver disease worldwide. The evidence for curcumin's effects on patients with NAFLD is accumulating; however, meta-analyses have reported mixed results. The current umbrella meta-analysis aimed to assess the present evidence and provide an accurate estimate of the overall effects of curcumin/turmeric on NAFLD patients. The Web of Science, Scopus, PubMed, ScienceDirect, and Google Scholar databases were searched till March 2023 using MeSH terms and related keywords based on the PICO criteria. Meta-analysis studies evaluating the effects of curcumin/turmeric supplementation on NAFLD patients that reported the effect sizes (ES) and corresponding confidence intervals (CI) were eligible for inclusion in this study. All articles were screened by considering the eligibility criteria by two independent reviewers and required data were extracted from the included meta-analyses. The meta-analysis was performed utilizing a random-effects model by STATA software. Findings of 11 meta-analyses of 99 randomized controlled trials comprising 5546 participants revealed that curcumin/turmeric supplementation reduced AST (ES = -1.072, 95% CI (-1.656, -0.488), p = 0.000), ALT (ES = -0.625, 95% CI (-1.170, -0.134), p = 0.014), and TG (ES = -0.469, 95% CI (-1.057, 0.119), p = 0.128) levels, and HOMA-IR (ES = -0.291, 95% CI (-0.368, -0.214), p = 0.000), BMI (ES = -0.205, 95% CI (-0.304, -0.107), p = 0.000), and WC (ES = -1.290, 95% CI (-2.038, -0.541), p = 0.001) in comparison to the control group. However, the effects of curcumin on GGT, ALP, TC, LDL-C, HDL-C, FBS, and HbA1C levels and body weight were not significant. The findings suggest the beneficial effects of curcumin/turmeric supplementation in patients with NAFLD, such as improving liver function, decreasing serum TG levels, ameliorating insulin resistance, and reducing general and central obesity. Nevertheless, high-quality research is further required to prove these achievements.

Regulatory effects of curcumin on nitric oxide signaling in the cardiovascular system

The continuously rising prevalence of cardiovascular disease (CVD) globally substantially impacts the economic growth of developing countries. Indeed, one of the leading causes of death worldwide is unfavorable cardiovascular events. Reduced nitric oxide (NO) generation is the pathogenic foundation of endothelial dysfunction, which is regarded as the first stage in the development of a number of CVDs. Nitric oxide exerts an array of biological effects, including vasodilation, the suppression of vascular smooth muscle cell proliferation and the functional control of cardiac cells. Numerous treatment strategies aim to increase NO synthesis or upregulate downstream NO signaling pathways. The major component of Curcuma longa, curcumin, has long been utilized in traditional medicine to treat various illnesses, especially CVDs. Curcumin improves CV function as well as having important pleiotropic effects, such as anti-inflammatory and antioxidant, through its ability to increase the bioavailability of NO and to positively impact NO-related signaling pathways. In this review, we discuss the scientific literature relating to curcumin's positive effects on NO signaling and vascular endothelial function.

Exploring the polarization of M1 and M2 macrophages in the context of skin diseases

Macrophages are critical components of the immune system and play vital roles in pathogen defense, immune regulation, and tissue repair. These cells exhibit different polarization states depending on environmental signals, and the M1/M2 paradigm is a useful tool for comprehending these states. This review article comprehensively presents the underlying mechanisms of M1 and M2 macrophage polarization and examines their polarization in various skin diseases. Additionally, this paper discusses therapeutic strategies that target M1 and M2 macrophage polarization in skin diseases. A more profound understanding of macrophage polarization in skin diseases could provide valuable insights for the development of innovative therapeutic strategies.

Cross-Linked Alginate Dialdehyde/Chitosan Hydrogel Encompassing Curcumin-Loaded Bilosomes for Enhanced Wound Healing Activity

The current study aimed to fabricate curcumin-loaded bilosomal hydrogel for topical wound healing purposes, hence alleviating the poor aqueous solubility and low oral bioavailability of curcumin. Bilosomes were fabricated via the thin film hydration technique using cholesterol, Span® 60, and two different types of bile salts (sodium deoxycholate or sodium cholate). Bilosomes were verified for their particle size (PS), polydispersity index (PDI), zeta potential (ZP), entrapment efficiency (EE%), and in vitro drug release besides their morphological features. The optimum formulation was composed of cholesterol/Span® 60 (molar ratio 1:10 w/w) and 5 mg of sodium deoxycholate. This optimum formulation was composed of a PS of 246.25 ± 11.85 nm, PDI of 0.339 ± 0.030, ZP of -36.75 ± 0.14 mv, EE% of 93.32% ± 0.40, and the highest percent of drug released over three days (96.23% ± 0.02). The optimum bilosomal formulation was loaded into alginate dialdehyde/chitosan hydrogel cross-linked with calcium chloride. The loaded hydrogel was tested for its water uptake capacity, in vitro drug release, and in vivo studies on male Albino rats. The results showed that the loaded hydrogel possessed a high-water uptake percent at the four-week time point (729.50% ± 43.13) before it started to disintegrate gradually; in addition, it showed sustained drug release for five days (≈100%). In vivo animal testing and histopathological studies supported the superiority of the curcumin-loaded bilosomal hydrogel in wound healing compared to the curcumin dispersion and plain hydrogel, where there was a complete wound closure attained after the three-week period with a proper healing mechanism. Finally, it was concluded that curcumin-loaded bilosomal hydrogel offered a robust, efficient, and user-friendly dosage form for wound healing.

Curcumin in Cancer Prevention: Insights from Clinical Trials and Strategies to Enhance Bioavailability

Cancer remains a leading cause of death worldwide, and current cancer drugs often have high costs and undesirable side effects. Additionally, the development of drug resistance can reduce their effectiveness over time. Natural products have gained attention as potential sources for the treatment and prevention of various diseases. Curcumin, an extract from turmeric (Curcuma longa), is a natural phenolic compound with diverse pharmacological properties, including antioxidant, anti-inflammatory, antiviral, antibacterial, antifungal, antiprotozoal, antidiabetic, antivenom, antiulcer, anticarcinogenic, antimutagenic, anticoagulant, and antifertility activities. Given the increasing interest in curcumin for cancer prevention, this review aims to comprehensively examine clinical trials investigating the use of curcumin in different types of cancer. Additionally, effective techniques and approaches to enhance the bioavailability of curcumin are discussed and summarized. This review article provides insights into the properties of curcumin and its potential as a future anticancer drug.