The Roles of Matrix Metalloproteinases and Their Inhibitors in Human Diseases

Tailoring hyaluronic acid hydrogels: Impact of cross-linker length and density on skin rejuvenation as injectable dermal fillers and their potential effects on the MAPK signaling pathway suppression

Hyaluronic acid (HA) hydrogels, obtained through cross-linking, provide a stable 3D environment that is important for controlled delivery and tissue engineering applications. Cross-linking density has a significant impact on the physicochemical properties of hydrogels, including their shape stability, mechanical stiffness and macromolecular diffusivity. However, often cross-linking chemistries require photoinitiator and catalyst that may be toxic and cause unwanted tissue response. Here, we prepared a series of HA hydrogel with varying cross-linker length and cross-linking density, which can be obtained by altering the feed ratio of three different cross-linkers from small molecules to macromolecules (e.g., 1,4-butanediol diglycidyl ether (BDDE), ferulic acid (FA), pluronic (PLU)), to ameliorate skin wrinkles in mice models. HA cross-linked with FA and PLU exhibited enzyme and temperature-dependent sol-to-gel phase transition, respectively, and the gels possess good injectability. In vitro test confirmed that HA hydrogels co-cultured with RAW 264.7 and HDF cells showed good biocompatibility. In particular, HA cross-linked with PLU stimulated the growth of HDF cells and HaCaT cells. HA cross-linked with PLU suppressed the expression levels of proteins involved in collagen degradation including mitogen-activated protein kinases (ERK, JNK, p38) and matrix metalloproteases (MMP-1, MMP-3, and MMP-9) resulting in increased deposition of Collagen I. The free-flowing sols of HA hydrogel precursors are subcutaneously injected into the back of BALB/c mice and form stable gels at the dermis layer and found to be non-toxic. More importantly, HA hydrogel cross-linked with PLU showed an enhanced anti-wrinkling effect in the wrinkled mice model. Thus, properties of HA hydrogels such as injectability, biocompatibility, and good anti-wrinkling effect altered through varying cross-linking density must be considered in the context of soft tissue engineering applications.

Matrix metalloproteinases and their tissue inhibitors as indicators of aortic aneurysm and dissection development in extracellular matrix remodeling

Aneurysms and dissections represent some of the most serious cardiovascular diseases. The prevailing theory posits that mechanical overloading of the vessel wall is the underlying cause. Inspired by Barkhordarian et al, the authors present matrix metalloproteinases (MMPs) and their inhibitors in immunohistological analyses as contributing factors in the pathophysiology of aortic aneurysms (AA). Data analysis of MMP-1, MMP-9, tissue inhibitors of metalloproteinases (TIMPs), including TIMP-1 and TIMP-2 expression reveals a varied distribution between the adventitia and media and a non-uniform expression of the investigated markers. These elements, as key components of the extracellular matrix (ECM), indicate that the formation of AA is not solely driven by endoluminal pressure loading of the aortic wall. Instead, degenerative processes within ECM elements contribute significantly. Importantly, AA do not necessarily imply dissection. Tissue destruction, allowing blood flow entry, arises from reduced oxygen supply to the media, primarily due to incomplete capillarization or neocapillarization.

The role of UV-induced cutaneous matrix metalloproteinases and mi-RNAs in the pathogenesis of lupus erythematosus

Cutaneous (CLE) and systemic lupus erythematosus (SLE) are autoimmune diseases with a multifactorial pathogenesis. Ultraviolet radiation (UVR) is the most important trigger of CLE; however, the degree of photosensitivity varies between the clinical subtypes. The expression of matrix metalloproteinases (MMPs)-important enzymes involved in skin turnover and homeostasis-is modulated by UVR. To investigate the causality of the clinically observed effects of UVR, sun-exposed lesional skin samples from patients with different subtypes of lupus erythematosus (LE) were examined by immunohistochemistry for the expression of MMP1 and MMP28 and compared with biopsies from polymorphous light eruption (PLE) and healthy skin (HS). The expression of micro-RNAs (miR-31 and miR-150)-regulators of MMP expression and cellular metabolism-in the samples was determined by in-situ hybridization and correlated with the expression of the glucose transporter 1 (GLUT1) receptor to examine potential metabolic regulation. To assess potential UVR regulation of MMP28, we performed in vitro experiments in healthy keratinocytes and fibroblasts. MMP28 expression was differentially affected by UVA1 and UVB irradiation in keratinocytes and fibroblasts. Compared with all other LE subtypes, as well as PLE and HS samples, MMP28 expression in Chilblain LE skin showed a distinct vertical distribution, reaching as far as the upper layers of the dermis. This vertical expression pattern coincided with decreased GLUT1 levels and with increased expression of miR-31 and miR-150 in the epidermis of patients with Chilblain LE. These data provide evidence for a potential metabolic dysregulation that may play a role in the etiology of LE. Furthermore, our results suggest MMP28 as a novel complementary marker in Chilblain LE diagnosis.

Tuning local matrix compliance accelerates mesenchymal stem cell chondrogenesis in 3D sliding hydrogels

The mechanical properties of the extracellular matrix critically regulate stem cell differentiation in 3D. Alginate hydrogels with tunable bulk stiffness and viscoelasticity can modulate differentiation in 3D through mechanotransduction. Such enhanced differentiation is correlated with changes in the local matrix compliance- the extent of matrix deformation under applied load. However, the causal effect of local matrix compliance changes without altering bulk hydrogel mechanics on stem cell differentiation remains unclear. To address this, we report sliding hydrogel (SG) designs with tunable local matrix compliance obtained by varying the molecular mobility of the hydrogel network without changing bulk mechanics. Atomic force microscopy showed increasing SG mobility allowed cells to increasingly deform local niches with lesser forces, indicating higher local matrix compliance. Increasing SG mobility accelerates MSC chondrogenesis in a mobility-dependent manner and is independent of exogenous adhesive ligands or cell volume expansion. The enhanced chondrogenesis in SG is accompanied by enhanced cytoskeletal organization and TRPV4 expression, and blocking these elements abolished the effect. In conclusion, this study establishes a causal link between local matrix compliance and stem cell differentiation and establishes it as a crucial hydrogel design parameter. Furthermore, it offers novel SG designs to probe the role of local matrix compliance in various biological processes.

Immobilization by 21-days of bed rest causes changes in biomarkers of cartilage homeostasis in healthy individuals

Objective

To investigate the effects of 21 days bed rest immobilization (with and without exercise and nutrition intervention) on serum concentrations of cartilage homeostasis biomarkers in healthy individuals.

Design

Twelve male volunteers (age 34.2 ​± ​8.3 years; BMI 22.4 ​± ​1.7 ​kg/m2) participated in 6 days of baseline data collection (BDC), 21 days of 6° head-down-tilt (HDT) bed rest (CON) ​+ ​interventions HDT ​+ ​resistive vibration exercise (RVE; 2 times/week; 25 ​min) and HDT ​+ ​RVE ​+ ​nutrition (NeX; 0.6 ​g/kg body weight/day whey protein and 90 ​mmol KHCO3/day bicarbonate supplementation), and 6 days of recovery (R) in a cross-over designed study. The starting HDT condition was randomized (CON-RVE-NeX, RVE-NeX-CON, NeX-CON-RVE). Blood samples were collected before, during and after HDT. Serum concentrations of COMP, MMP-3, MMP-9, YKL-40 and resistin were analyzed.

Results

The main effect of time was significant for all biomarkers tested (p ​< ​0.001). While COMP (-36 ​% at HDT5, p ​< ​0.001) and MMP-3 (-36 ​% at HDT21, p ​< ​0.001) decreased during HDT bed rest, MMP-9 (+18 ​% at HDT5, p ​< ​0.001) and resistin (+13 ​% at HDT21, p ​< ​0.001) increased during HDT bed rest. Interestingly, during recovery, YKL-40 levels increased (+13 ​% at R1, p ​= ​0.022), while MMP-9 levels decreased (-19 ​% at R6, p ​= ​0.035). We identified correlations between COMP and MMP-3 (rrm ​= ​0.58, p ​< ​0.001) as well as between MMP-9 and resistin (rrm ​= ​0.58, p ​< ​0.001).

Conclusions

Immobilization affects serum concentrations of cartilage homeostasis biomarkers suggesting changes in cartilage metabolism that do not completely recover during re-ambulation. Both interventions had only minimal effects.

SARM1 deletion inhibits astrogliosis and BBB damage through Jagged-1/Notch-1/NF-κB signaling to improve neurological function after ischemic stroke

Reactive astrogliosis is a critical process in the development of ischemic stroke. However, the precise mechanism by which reactive astrogliosis changes the pathogenesis of ischemic stroke remains elusive. Sterile alpha and TIR motif-containing 1 protein (SARM1) plays a key role in axonal degeneration and is involved in different cell death programs that regulate neuronal survival. The present study investigated the role of SARM1 in regulating reactive astrogliosis and neurological function after stroke in whole-body SARM1 knockout (SARM1-/-) mice. SARM1-/- mice showed significantly smaller infarction, slighter apoptosis, and fewer neurological function deficits 1-7 days after ischemic injury. Immunohistochemistry, western blot, and real-time PCR analyses revealed that compared with the wild-type (WT) mice, SARM1-/- mice exhibited reduced astrocytic proliferation, increased anti-inflammatory astrocytes, decreased glial scar formation in the infarct zone on day 7 after ischemic injury. SARM1 deletion also suppressed cerebral microvascular damage and blood-brain barrier (BBB) injury in ischemic brains. Mechanistically, SARM1 deletion inhibited the stroke-triggered activation of NF-κB signaling and decreased the expression of Jagged-1 and NICD in astrocytes. Overall, these findings provide the first line of evidence for a causative role of SARM1 protein in ischemia-induced reactive astrogliosis and ischemic neurovascular damage.

Isoxazolyl steroid blocks the Shh signaling pathway and the expression of MMP-2 and MMP-9 in cervical carcinoma cell lines

Cervical cancer is the fourth leading cause of cancer death among women worldwide. Matrix metalloproteinases MMP-2 and MMP-9 play a leading role in the processes of invasion and metastasis in cervical cancer. Research on the development of MMP inhibitors not yielded the expected results due to their serious side effects. Study of signaling pathways involved in regulation of MMPs expression is of great importance for search of new classes of therapeutic drugs. Aberrant activation of the Sonic Hedgehog (Shh) signaling pathway is associated with increased MMPs in many types of human cancer. This study investigated the inhibitory action of 17β-((3-butylisoxazol-5-yl)methyl)-androst-5-en-3β-ol on the Shh signaling pathway key genes (Ptch, Smo, Gli) expression and MMP-2, MMP-9 genes expression in human cervical carcinoma cell lines (SiHa and CaSki) and keratinocytes (HaCaT). Cyclopamine was used for comparative analysis. Gene expression analysis was performed using real-time PCR; the effects on survival and cell cycle were studied using the MTT test and flow cytometry method. 17β-((3-butylisoxazol-5-yl)methyl)-androst-5-en-3β-ol had higher cytotoxicity and more effectively blocked the Shh signaling pathway genes and MMP-2 and MMP-9 genes compared to cyclopamine in all cell lines. The results obtained demonstrate potential of 17β-((3-butylisoxazol-5-yl)methyl)-androst-5-en-3β-ol as the anticancer drug that simultaneously block the Shh signaling pathway and MMP expression. We are confident that the search for substances capable of simultaneously affecting several key components involved in tumor progression is of great importance for the creation of next-generation therapeutic agents.

A versatile platform based on matrix metalloproteinase-sensitive peptides for novel diagnostic and therapeutic strategies in arthritis

Matrix metalloproteinases (MMPs), coupled with other proteinases and glycanases, can degrade proteoglycans, collagens, and other extracellular matrix (ECM) components in inflammatory and non-inflammatory arthritis, making them important pathogenic molecules and ideal disease indicators and pharmaceutical intervention triggers. For MMP responsiveness, MMP-sensitive peptides (MSPs) are among the most easily synthesized and cost-effective substrates, with free terminal amine and/or carboxyl groups extensively employed in multiple designs. We hereby provide a comprehensive review over the mechanisms and advances in MSP applications for the management of arthritis. These applications include early and precise diagnosis of MMP activity via fluorescence probe technologies; acting as nanodrug carriers to enable on-demand drug release triggered by pathological microenvironments; and facilitating cartilage engineering through MMP-mediated degradation, which promotes cell migration, matrix synthesis, and tissue integration. Specifically, the ultra-sensitive MSP diagnostic probes could significantly advance the early diagnosis and detection of osteoarthritis (OA), while MSP-based drug carriers for rheumatoid arthritis (RA) can intelligently release anti-inflammatory drugs effectively during flare-ups, or even before symptoms manifest. The continuous progress in MSP development may acceleratedly lead to novel management regimens for arthropathy in the future.

Differential Gene Analysis of Langerhans Cell Histiocytosis and the Significance of MMP1-Targeted Drug Repositioning

Langerhans cell histiocytosis (LCH) is a rare condition predominantly affecting young children. Activation of the MAPK pathway has offered key new insights into the pathogenesis of LCH; however, the precise mechanisms underlying its occurrence and development are still far from being completely elucidated. There is still a relapse/reactivation rate in patients with multisystem LCH. Therefore, this study aimed to investigate other potential LCH pathophysiologies and prospective therapeutic targets. The gene expression omnibus (GEO) database was used to retrieve gene expression profiles of LCH (GSE16395). Three distinct types of analyses were performed after identifying the common differentially expressed genes (DEGs) in LCH: hub gene identification, functional annotation, module construction, drug repositioning, and expression analysis via immunohistochemistry (IHC). We identified 417 common DEGs and 50 central hub genes. This functional study highlighted the significance of keratinization, skin development, and inflammation. In addition, we predicted new drug candidates (RS2 drugs targeting matrix metalloprotease1, MMP1) that could be used for LCH treatment. Finally, gene-miRNA and gene-TF networks and immune cell infiltration were analyzed for MMP1-related genes. MMP1 expression levels in LCH tissues were validated by IHC. Our study identified the central communal genes and novel drug candidates. These shared pathways and hub genes offer new perspectives on future mechanisms of action and therapeutic targets.

Fluoxetine-Conjugated Platinum(IV) Prodrugs Targeting eEF2K and Conquering Multidrug Resistance against Triple-Negative Breast Cancer

Triple-negative breast cancer (TNBC) poses formidable challenges in the clinic owing to its particularly malignant and aggressive properties. Overexpression of eukaryotic elongation factor-2 kinase (eEF2K) is highly correlated with the poor prognosis of TNBC, representing a promising therapeutic target. Herein, Fluoxetine as eEF2K-inhibitor and chemosensitizer was conjugated with cisplatin/oxaliplatin to present two-in-one prodrugs 8-19. Multievaluation indicated that monosubstituted 8 and disubstituted 12 exhibited 407- and 174-fold higher cytotoxicity than cisplatin against MDA-MB-231 cells by elevating DNA damage-induced apoptosis and eEF2K-triggered autophagy. Moreover, 8 and 12 significantly overcame chemoresistance in A549cisR cells, evidenced by downregulating resistance-related key proteins P-gp, GST-π, ATM, and RAD51. Syngeneic and xenograft mouse models demonstrated that 8 and 12 could effectively inhibit tumor growth and metastasis, and reduce toxicity compared to cisplatin in vivo. Additionally, 8 and 12 stimulated immunomodulation including T-cell proliferation and Th1 cytokine production. All results hold the promise of 8 and 12 as multifunctional chemotherapeutic agents.

Systematic Review of Relevant Biomarkers for Human Connective Tissue Repair and Healing Outcome: Implications for Understanding Healing Processes and Design of Healing Interventions

Objective: The healing process following connective tissue (CT) injuries is complex, resulting in variable and often suboptimal outcomes. Patients undergoing CT repair frequently experience healing failures, compromised function, and chronic degenerative diseases. The identification of biomarkers to guide improved clinical outcomes after CT injuries remains an emerging but promising field. [Figure: see text] [Figure: see text] Design: Systematic review. Data sources: Databases, including PubMed, MEDLINE Ovid, Web of Science, and Google Scholar, were searched up to August 2024. Eligibility criteria: To achieve the research objective, randomized control trials, cohort studies, and case-control studies on biomarkers associated with CT repair and healing outcomes were selected. The present analysis was confined to clinical and preclinical models, excluding imaging studies. The entire process of this systematic review adhered strictly to the guidelines outlined in the Preferred Reporting Items for Systematic Review and Meta-Analyses protocol checklist. Results: A total of 1,815 studies on biomarkers of CT repair were initially identified, with 75 studies meeting eligibility criteria and 55 passing quality assessments. For biomarkers associated with CT healing outcomes, 281 studies were considered, with 30 studies meeting eligibility criteria and 24 passing quality assessments. Twenty-one overlapping studies investigated the effects of biomarkers on both CT repair and healing outcomes. Specific biomarkers identified, and ranked from highest to lowest quality, include complement factor D, eukaryotic elongation factor-2, procollagen type I N-terminal propetide, procollagen type III N-terminal propetide, lactate, pyruvate, platelet-derived growth factor-BB, tissue inhibitor of metalloproteinase-3 (TIMP-3), cysteine-rich protein-1, plastin-3, periostin, protein S100-A11, vimentin, matrix metalloproteinases (MMP-2, MMP-7, and MMP-9), hepatocyte growth factor, interferon-γ, interleukins (IL-6, IL-8, and IL-10), MMP-1, MMP-3, tumor necrosis factor-α, fibroblast growth factor-2, IL-1α, chondroitin-6-sulfate, inter-alpha-trypsin inhibitor heavy chain-4, transforming growth factor-beta 1, vascular endothelial growth factor, C-C chemokine receptor 7, C-C chemokine ligand 19, IL-1β, IL-1Ra, IL-12p40, granulocyte-macrophage colony-stimulating factor (GM-CSF), and TIMP-1. Conclusions: All of the 37 identified potential biomarkers demonstrated regulatory effects on CT repair and mediated healing outcomes. Notably, the identified biomarkers from human studies can potentially play an essential role in the development of targeted treatment protocols to counteract compromised healing and can also serve as predictors for detecting CT healing processes and long-term outcomes.

Transcriptional and post-translational mechanisms of ECM remodeling in rotator cuff tendons under hyperlipidemic conditions

Rotator cuff injuries present significant clinical challenges, often resulting in chronic pain and functional impairment. In this study, we examined the effects of hyperlipidemia (HYP), a systemic metabolic condition, on tendon health. Histological analysis of infraspinatus tendons from hyperlipidemic swine revealed well-organized extracellular matrix (ECM) structures, comparable to those in non-hyperlipidemic (NONHYP) animals, suggesting ECM reorganization. Upstream SIGNOR3.0 analysis demonstrated that tumor necrosis factor receptor-associated factor 6 (TRAF6) activates transcription factor Yin Yang 1 (YY1) via kinase signaling, underscoring its role in tendon ECM remodeling. Hence, we futher examined the role of YY1, which is a critical regulator of collagen synthesis identified through network analysis. Although TRAF6 levels remained unchanged in HYP conditions, increased YY1 expression correlated with elevated COL1 gene expression. Additionally, twist-related protein 1 (TWIST1) emerged as another key molecule, existing in both homo- and heterodimer forms in NON-HYP conditions, but only as a heterodimer in HYP. YY1 enhanced COL1 transcription in the hyperlipidemic environment, while TWIST1 heterodimer formation facilitated collagen crosslinking. Notably, increased YY1 expression inhibited MMP3, resulting in the inactivity of MMP1, MMP8, and MMP9, thereby preserving collagen levels. These findings highlight the complex molecular interactions involving transcriptional regulation by YY1 and post-translational regulation by the TWIST1 heterodimer, essential for the deposition of mature collagen fibrils and driving tendon remodeling in hyperlipidemic conditions. This study offers valuable insights for the change of tendon health condition in hyperlipidemia disease or tendon pathology.

Smartphone addiction and musculoskeletal associated disorders in university students: biomechanical measures and questionnaire survey analysis

BACKGROUND

Smartphone addiction significantly impacts the musculoskeletal system, with 79% of younger adults aged 18-44 reporting excessive cell phone use. In addition, rare data exist on the roles of biological markers like 5-HT receptors, oxidative stress markers (TAC, MDA), collagen biomarkers (TIMP-1, TIMP-2), and triglycerides (TG) in the effects of smartphone addiction on the musculoskeletal system, particularly among university students.

OBJECTIVE

Thus, the study aimed to investigate the potential link between smartphone addiction levels and certain biological indicators related to musculoskeletal injuries in the hands and necks of young, healthy university students.

METHODS

A total of 250 healthy university students aged 17-30 years old were randomly invited to participate in this descriptive cross-sectional analytical study. All participants were categorized into two groups based on their smartphone usage duration: non-addicted (1-3h./day; n = 48) and addicted (≥ 5h./day; n = 12). Smartphone addiction, musculoskeletal discomfort in the neck and hands, adiposity-related outcomes, and musculoskeletal disorder (MSD) biomarkers, like matrixmetalloproteinases (MMPs); TIMP-1,TIMP-2;5-hydroxytryptophans (5-HT), triglyceride (TG), malondialdehyde (MDA), and total antioxidant capacity (TAC) were assessed using validated questionnaires like the Neck Disability Index (NDI), Cornell Hand Discomfort Questionnaire (CHDQ), and Visual Analogue Scale (VAS), respectively, and ELISA immunoassay analysis.

RESULTS

A significant link was reported between smartphone addiction and neck pain, hand discomfort, and adiposity markers in 64%of the participant cohort. Moreover, females exhibited higher rates of addiction and susceptibility compared to their male counterparts (62.5% vs. 37.5%). Overall, the outcomes score of prolonged smartphone usage was positively correlated with adiposity, musculoskeletal disorders, and pain measured by the NDI, CHDQ, and VAS, respectively. Smartphone-addicted students demonstrated lower levels of TIMP-1, TIMP-2, and TAC activity, along with elevated 5-HT, TG, and MDA levels, compared to non-addicted controls.

CONCLUSION

Smartphone addiction is positively associated with adiposity and musculoskeletal issues, particularly in the neck, shoulders, and hands, among university students. Key biomarkers (TIMP-1, TIMP-2, 5-HT, TG, MDA, TAC) significantly correlate with the severity of neck and hand MSD, as indicated by NDI, CHDQ, and VAS scores. Thus, public health initiatives are essential to raise awareness of the physical and biological risks of excessive smartphone use.

Matrix Metalloproteinases in Glioma: Drivers of Invasion and Therapeutic Targets

Matrix metalloproteinases (MMPs) are a family of zinc-dependent proteolytic enzymes that are crucial for the remodeling of the extracellular matrix, a process that is often co-opted by cancers, including brain tumors, to facilitate growth, invasion, and metastasis. In gliomas, MMPs contribute to a complex interplay involving tumor proliferation, angiogenesis, and immune modulation, thereby influencing tumor progression and patient prognosis. This review provides a comprehensive analysis of the roles of various MMPs in different types of gliomas, from highly malignant gliomas to metastatic lesions. Emphasis is placed on how the dysregulation of MMPs impacts tumor behavior, the association between specific MMPs and the tumor grade, and their potential as biomarkers for diagnosis and prognosis. Additionally, the current therapeutic approaches targeting MMP activity are discussed, exploring both their challenges and future potential. By synthesizing recent findings, this paper aims to clarify the broad significance of MMPs in gliomas and propose avenues for translational research that could enhance treatment strategies and clinical outcomes.

Collagen turnover during cervical remodeling involves both intracellular and extracellular collagen degradation pathways†

Reproductive success requires accurately timed remodeling of the cervix to orchestrate the maintenance of pregnancy, the process of labor, and birth. Prior work in mice established that a combination of continuous turnover of fibrillar collagen and reduced formation of collagen cross-links allows for the gradual increase in tissue compliance and delivery of the fetus during labor. However, the mechanism for continuous collagen degradation to ensure turnover during cervical remodeling is still unknown. This study demonstrates the functional role of extracellular and intracellular collagen degradative pathways in two different settings of cervical remodeling: physiological term remodeling and inflammation-mediated premature remodeling. Extracellular collagen degradation is achieved by the activity of fibroblast-derived matrix metalloproteases MMP14, MMP2, and fibroblast activation protein (FAP). In parallel, we demonstrate the function of an intracellular collagen degradative pathway in fibroblast cells mediated by the collagen endocytic mannose receptor type-2 (MRC2). These pathways appear to be functionally redundant as loss of MRC2 does not obstruct collagen turnover or cervical function in pregnancy. While both extracellular and intracellular pathways are also utilized in inflammation-mediated premature cervical remodeling, the extracellular collagen degradation pathway uniquely employs fibroblast and immune-cell-derived proteases. In sum, these findings identify the dual utilization of two distinct degradative pathways as a failsafe mechanism to achieve continuous collagen turnover in the cervix, thereby allowing dynamic shifts in cervical tissue mechanics and function.

Matrix metalloproteinase-driven epithelial-mesenchymal transition: implications in health and disease

Epithelial-mesenchymal transition (EMT) is a process in which epithelial cells, defined by apical-basal polarity and tight intercellular junctions, acquire migratory and invasive properties characteristic of mesenchymal cells. Under normal conditions, EMT directs essential morphogenetic events in embryogenesis and supports tissue repair. When dysregulated, EMT contributes to pathological processes such as organ fibrosis, chronic inflammation, and cancer progression and metastasis. Matrix metalloproteinases (MMPs)-a family of zinc-dependent proteases that degrade structural components of the extracellular matrix-sit at the nexus of this transition by dismantling basement membranes, activating pro-EMT signaling pathways, and cleaving adhesion molecules. When normally regulated, MMPs promote balanced ECM turnover and support the cyclical remodeling necessary for proper development, wound healing, and tissue homeostasis. When abnormally regulated, MMPs drive excessive ECM turnover, thereby promoting EMT-related pathologies, including tumor progression and fibrotic disease. This review provides an integrated overview of the molecular mechanisms by which MMPs both initiate and sustain EMT under physiological and disease conditions. It discusses how MMPs can potentiate EMT through TGF-β and Wnt/β-catenin signaling, disrupt cell-cell junction proteins, and potentiate the action of hypoxia-inducible factors in the tumor microenvironment. It discusses how these pathologic processes remodel tissues during fibrosis, and fuel cancer cell invasion, metastasis, and resistance to therapy. Finally, the review explores emerging therapeutic strategies that selectively target MMPs and EMT, ranging from CRISPR/Cas-mediated interventions to engineered tissue inhibitors of metalloproteinases (TIMPs), and demonstrates how such approaches may suppress pathological EMT without compromising its indispensable roles in normal biology.

The polyphenolic compound, α-conidendrin, exerts anti-colon cancer and anti-angiogenic effects by targeting several signaling molecules

Our previous study indicated that α-conidendrin had considerable anti-proliferative activities against breast cancer cell lines. The present study aimed to evaluate the anti-colon cancer and anti-angiogenic influences of α-conidendrin as well as its molecular mechanisms. The findings of the current study demonstrate that α-conidendrin possesses potent anti-colon cancer and anti-angiogenic effects. α-Conidendrin significantly inhibited the proliferation of colon cancer cells. This polyphenolic compound induced caspase-mediated apoptosis in HT-29 cells by modulating the PTEN/PI3K/Akt/mTOR signaling pathway. α-Conidendrin markedly upregulated the protein expression of PTEN and downregulated the protein expression of p-PI3K, p-AKt, and p-mTOR. The protein expression of caspase-3 and caspase-9 enhanced in colon cancer cells following treatment with α-conidendrin. This study also revealed the anti-angiogenic activities of α-conidendrin in the ex vivo and in vitro models. α-Conidendrin significantly downregulated the mRNA expression of HIF-1α, VEGF, MMP-2, and MMP-9 in endothelial cells. These data highlight that α-conidendrin can act as a novel and promising anti-cancer and anti-angiogenic agent for treatment of colon cancer.

Exercise alleviates osteoporosis by regulating the secretion of the Senescent Associated Secretory Phenotype

As the elderly population grows, the number of patients with metabolic bone diseases such as osteoporosis has increased sharply, posing a significant threat to public health and social economics. Although pharmacological therapies for osteoporosis demonstrate therapeutic benefits, their prolonged use is associated with varying degrees of adverse effects. As a non-pharmacological intervention, exercise is widely recognized for its cost-effectiveness, safety, and lack of toxic side effects, making it a recommended treatment for osteoporosis prevention and management. Previous studies have demonstrated that exercise can improve metabolic bone diseases by modulating the Senescent Associated Secretory Phenotype (SASP). However, the mechanisms through which exercise influences SASP remain unclear. Therefore, this review aims to summarize the effects of exercise on SASP and elucidate the specific mechanisms by which exercise regulates SASP to alleviate osteoporosis, providing a theoretical basis for osteoporosis through exercise and developing targeted therapies.

The potential of miR-29 in modulating tumor angiogenesis: a comprehensive review

MicroRNAs (miRNAs) are a class of short non-coding RNAs that play a crucial role in the post-transcriptional regulation of gene expression. They are associated with various biological processes related to tumors. Among the numerous miRNAs, miR-29 has garnered attention for its role in regulating tumor angiogenesis. In numerous human tumors, miR-29 has been demonstrated to negatively correlate with the capacity for angiogenesis and the degree of malignancy, as well as with the expression levels of pro-angiogenic factors such as vascular endothelial growth factor vascular endothelial growth factor (VEGF), platelet-derived growth factor (PDGF), and matrix metalloproteinase (MMP)-2. Multiple studies, utilizing techniques like dual-luciferase reporter assays, have confirmed that miR-29 directly targets the 3'-untranslated region (UTR) of mRNAs for VEGF, PDGF, and MMP-2. Extensive investigations involving tumor cell lines and animal models have shown that the overexpression of miR-29, achieved through miRNA transfection or the introduction of miRNA mimics, effectively inhibits angiogenesis by upregulating these pro-angiogenic factors. Conversely, downregulation of miR-29 using specific inhibitors promotes angiogenesis. While small molecule inhibitors and antibodies targeting VEGF constitute a primary strategy in anti-angiogenesis therapies, miR-29's ability to target multiple pro-angiogenic molecules positions it as a promising candidate for future therapeutic interventions, especially with ongoing advancements in nucleic acid drug design and delivery systems.

Recombinant human collagen XVII protects skin basement membrane integrity by inhibiting the MAPK and Wnt signaling pathways

Collagen XVII is a key component linking the cytoskeleton to the basement membrane, serving an essential role in maintaining skin integrity. With the advancement of synthetic biology, recombinant human collagen XVII (RHCXVII) has emerged as a promising novel collagen material. The present study aimed to elucidate the efficacy and mechanisms of action of RHCXVII in protecting skin basement membrane integrity. A skin injury model was established using ultraviolet B (UVB) irradiation on human HaCaT keratinocytes treated with RHCXVII. The effects of RHCXVII on cell migration and adhesion were assessed using wound healing assay and hematoxylin and eosin staining, respectively. The expression of key extracellular matrix (ECM) components such as collagen IV, collagen VII, laminin 332 and integrin α6 (ITGA6) were quantified using reverse transcription‑quantitative PCR and western blotting. The mechanism of action of RHCXVII in protecting skin basement membrane integrity was investigated using a phosphorylated‑antibody array and verified by western blotting. RHCXVII significantly increased the migration and adhesion of UVB‑irradiated HaCaT cells (P<0.01). Additionally, RHCXVII significantly upregulated expression levels of collagen type IV α1 chain, collagen type VII α1 chain, laminin subunit β3 and ITGA6 in UVB‑irradiated HaCaT cells (P<0.05). RHCXVII significantly inhibited the phosphorylation of p38 and c‑Jun in the MAPK and Wnt signaling pathways (P<0.01). In conclusion, RHCXVII protected skin basement membrane integrity by enhancing migration and adhesion of keratinocytes, upregulating key ECM components and inhibiting protein phosphorylation in MAPK and Wnt pathways. The present study enhanced the current understanding of RHCXVII as a protector of skin basement membrane integrity. Furthermore, the present study highlighted clinical implications and the broad therapeutic potential of RHCXVII in both medical and cosmetic application.

Hydroxypropyl-Methylcellulose and GlicoPro® Eyedrops in the Treatment of Dry Eye Disease: In Vitro and Clinical Study

INTRODUCTION

Artificial tear substitutes are key elements in the first-line treatment of dry eye disease (DED). We hypothesized that GlicoPro®, a new multimolecular complex based on proteins, sulfured and unsulfured glycosaminoglycans and opiorphin, was able to significantly improve the effect of hydroxypropyl-methylcellulose (HPMC) eyedrops in treating DED.

METHODS

We performed an in vitro experiment and a clinical study, comparing an HPMC + GlicoPro®-based to an HPMC-based ophthalmic formulation (similar kinematic viscosity and comparable HPMC concentration). An in vitro dry eye model was established by inducing hyperosmolarity in the base medium of human corneal epithelial cells HCE-2. After treatment with ophthalmic formulations, the expression levels of inflammatory cytokines and enzymes (IL-20, IL-1β, TNF-α, IL-6, IL-8, MMP-9, and MCP-1) was measured by real-time polymerase chain reaction. Moreover, we performed a single-blind randomized 1:1 clinical trial, aimed to compare the efficacy of the two formulations instilled four times per day (QID), in treating mild-to-moderate DED. Symptoms (Ocular Surface Disease Index and Symptom Assessment iN Dry Eye), clinical signs, and ocular surface imaging data were assessed at baseline and after 1 and 3 months of treatment.

RESULTS

In vitro experiment: under hyperosmotic conditions, corneal epithelial cells upregulated the expression of inflammatory cytokines IL-20, IL-1β, TNF-α, IL-6, and IL-8. Treatment with HPMC + GlicoPro® significantly decreased the expression of all inflammatory markers tested, including cytokines, MMP-9, and MCP-1 (P < 0.05).

CLINICAL STUDY

the HPMC + GlicoPro® formulation showed a significantly higher effect in improving symptoms (overall treatment effect: P < 0.001), tear film stability, and markers of inflammation on corneal confocal microscopy (P < 0.01).

CONCLUSIONS

Both in vitro and clinical data provided evidence supporting the role of GlicoPro® in improving the effect of HPMC in DED treatment.

CLINICAL TRIAL REGISTRATION

NCT06726525.

PM2.5 Induces the Instability of Atherosclerotic Plaques by Activating the Notch Signaling Pathway In Vivo and In Vitro

Fine particulate matter (PM2.5) can exacerbate the instability of atherosclerotic plaques although the exact chemical process driving atherosclerosis remains unknown. In order to create atherosclerotic models, a high-fat diet and vitamin D3 injections were given to 56 Wistar rats in this investigation. The atherosclerotic rats were split into four groups at random and given different doses of PM2.5 (0, 1.5, 7.5, and 37.5 mg/kg) for 4 weeks. To investigate the mechanism, foam cells were exposed to PM2.5 (0, 25, 50, and 100 μg/mL) for 24 h. The results showed that PM2.5 exposure caused collagen fibers thinner and muscle fibers were disorganized. PM2.5 exposure significantly affected the expression of MMP2, MMP9, TIMP2, and vimentin in aortas of atherosclerotic rats. Moreover, PM2.5 exposure increased the expression of the Notch signaling pathways which was correlated with the expression of atherosclerotic plaque stability-related genes. PM2.5 exposure also increased the apoptosis rate of foam cells. The expression of MMP2, MMP9, and vimentin was increased and TIMP2 was decreased with the increasing PM2.5 dose in foam cells. The inhibition of the Notch signaling pathway can alleviate the alteration of atherosclerotic plaque stability-related genes. The findings demonstrated that PM2.5 exposure can cause atherosclerotic plaques to become unstable, aggravating the progression of atherosclerosis, a process in which the Notch signaling pathway is crucial.

Systemic aging fuels heart failure: Molecular mechanisms and therapeutic avenues

Systemic aging influences various physiological processes and contributes to structural and functional decline in cardiac tissue. These alterations include an increased incidence of left ventricular hypertrophy, a decline in left ventricular diastolic function, left atrial dilation, atrial fibrillation, myocardial fibrosis and cardiac amyloidosis, elevating susceptibility to chronic heart failure (HF) in the elderly. Age-related cardiac dysfunction stems from prolonged exposure to genomic, epigenetic, oxidative, autophagic, inflammatory and regenerative stresses, along with the accumulation of senescent cells. Concurrently, age-related structural and functional changes in the vascular system, attributed to endothelial dysfunction, arterial stiffness, impaired angiogenesis, oxidative stress and inflammation, impose additional strain on the heart. Dysregulated mechanosignalling and impaired nitric oxide signalling play critical roles in the age-related vascular dysfunction associated with HF. Metabolic aging drives intricate shifts in glucose and lipid metabolism, leading to insulin resistance, mitochondrial dysfunction and lipid accumulation within cardiomyocytes. These alterations contribute to cardiac hypertrophy, fibrosis and impaired contractility, ultimately propelling HF. Systemic low-grade chronic inflammation, in conjunction with the senescence-associated secretory phenotype, aggravates cardiac dysfunction with age by promoting immune cell infiltration into the myocardium, fostering HF. This is further exacerbated by age-related comorbidities like coronary artery disease (CAD), atherosclerosis, hypertension, obesity, diabetes and chronic kidney disease (CKD). CAD and atherosclerosis induce myocardial ischaemia and adverse remodelling, while hypertension contributes to cardiac hypertrophy and fibrosis. Obesity-associated insulin resistance, inflammation and dyslipidaemia create a profibrotic cardiac environment, whereas diabetes-related metabolic disturbances further impair cardiac function. CKD-related fluid overload, electrolyte imbalances and uraemic toxins exacerbate HF through systemic inflammation and neurohormonal renin-angiotensin-aldosterone system (RAAS) activation. Recognizing aging as a modifiable process has opened avenues to target systemic aging in HF through both lifestyle interventions and therapeutics. Exercise, known for its antioxidant effects, can partly reverse pathological cardiac remodelling in the elderly by countering processes linked to age-related chronic HF, such as mitochondrial dysfunction, inflammation, senescence and declining cardiomyocyte regeneration. Dietary interventions such as plant-based and ketogenic diets, caloric restriction and macronutrient supplementation are instrumental in maintaining energy balance, reducing adiposity and addressing micronutrient and macronutrient imbalances associated with age-related HF. Therapeutic advancements targeting systemic aging in HF are underway. Key approaches include senomorphics and senolytics to limit senescence, antioxidants targeting mitochondrial stress, anti-inflammatory drugs like interleukin (IL)-1β inhibitors, metabolic rejuvenators such as nicotinamide riboside, resveratrol and sirtuin (SIRT) activators and autophagy enhancers like metformin and sodium-glucose cotransporter 2 (SGLT2) inhibitors, all of which offer potential for preserving cardiac function and alleviating the age-related HF burden.

Directed evolution of proteoglycan-modifying enzymes: Functional applications in cervical cancer therapy

The study investigates the therapeutic potential of enzyme variations EP-22, DS-13, and SM-47 in cervical cancer treatment using HeLa and SiHa cell lines, focusing on their effects on cell viability, migration, and molecular targets. The MTT assay findings also show that at a concentration of 50 μg/mL, EP-22 has an IC50 value of 35 % for HeLa cells and 28 % for SiHa cells, a significant dose effect (p < 0.01). EP-22 was not less potent at a lower working concentration of 25 μg/mL and could reduce HeLa cell viability to 78 %. In this case, there were significant changes in the anti-migratory effect, as evidenced by 45 % inhibition of SiHa cell migration and a 12 % wound closure rate compared with 54 % in the untreated cells. The obtained densitometric analysis indicated that in EP-22 treated HeLa cells, syndecan-1 and perlecan protein levels were reduced by approximately 65 % and 57 %, respectively, while the MMP-2 and MMP-9 levels were reduced to about 50 % and 45 %, respectively. Annexin V staining also highlighted a 40 % enhancement in early apoptosis and 25 % in late apoptosis in EP-22 handled cells. These data suggest the potential of EP-22 and its derivatives as therapeutic molecules in cervical cancer treatment, reducing HeLa proliferation by 35 % and SiHa by 28 %, inhibiting SiHa migration by 45 %, and affecting molecular targets involved in adhesion and invasiveness. Future studies must elucidate the effectiveness of in vivo experiments and how these findings were obtained. At 50 μg/mL, EP-22 reduced HeLa and SiHa cell viability by 35 % and 28 %, respectively, with significant dose-dependent effects (p < 0.01). At 25 μg/mL, EP-22 maintained potency, reducing HeLa cell viability to 78 %. EP-22 inhibited SiHa cell migration by 45 % and reduced wound closure rates to 12 % compared to 54 % in untreated cells. This work uses the HeLa and SiHa cell lines to examine the therapeutic potential of enzyme variation EP-22 in cervical cancer. EP-22 showed significant anti-cancer effects at 50 μg/mL doses, reducing cell viability at lower concentrations and achieving an IC50 of 35 % for HeLa cells and 28 % for SiHa cells. It is worth mentioning that EP-22 considerably reduced levels of essential proteins: syndecan-1 (65 %), perlecan (57 %), MMP-2 (50 %), and MMP-9 (45 %), in addition to inhibiting SiHa cell migration by 45 %. Furthermore, annexin V staining showed that treated cells exhibited a 40 % increase in early apoptosis and a 25 % increase in late apoptosis.

Targeting leukocyte immunoglobulin‑like receptor B2 in the tumor microenvironment: A new treatment prospect for solid tumors (Review)

Leukocyte immunoglobulin-like receptor B2 (LILRB2) functions as an immunosuppressive receptor that has a prominent role in immune regulation. The expression of LILRB2 is higher in a variety of solid malignant tumors compared with that in corresponding normal tissues. LILRB2 can be expressed in tumor cells and tumor stromal cells within the tumor microenvironment. Upregulation of LILRB2 in tumors is significantly associated with a poorer tumor phenotype, increased tolerance to certain therapeutic drugs, tumor immune escape and shorter patient overall survival time. Therefore, LILRB2 can be utilized as a novel biomarker to predict the prognosis of patients with solid malignant tumors, and targeting LILRB2 may be an effective strategy for targeted cancer therapy. The present review provides a general overview of the role and mechanisms of LILRB2 in the microenvironment of solid tumors, and emphasizes the significance of targeting LILRB2 as a promising approach for tumor-specific therapy.

Tissue Inhibitor of Metalloproteinase 2 Promotes Wound Healing by Suppressing Matrix Metalloproteinases and Inflammatory Cytokines in Corneal Epithelial Cells

Tissue inhibitors of metalloproteinases (TIMPs) modulate extracellular matrix remodeling for maintaining homeostasis and promoting cell migration and proliferation. Pathologic conditions can alter TIMP homeostasis and aggravate disease progression. The roles of TIMPs have been studied in tissue-related disorders; however, their contributions to tissue repair during corneal injury are undefined. Here, the TIMP expression in human corneal epithelial cells under homeostatic and inflammatory milieus was profiled to examine their contribution to the healing of injured corneal epithelia. Transcriptionally, TIMP2 was highly expressed in human corneal epithelial cells when stimulated with 100 ng/mL IL1B or scratch wounded. Unlike TIMP1, recombinant TIMP2 (rTIMP2) significantly promoted epithelial cell wound closure compared with untreated and TIMP2-neutralizing conditions. At 12 hours, the Ki-67+ cells significantly increased threefold in number compared with untreated cells, suggesting that rTIMP2 is associated with cell proliferation. Furthermore, rTIMP2 treatment significantly suppressed inflammatory cytokine expression (IL1B, IL6, IL8, and TNFA) and injury-induced matrix metalloproteinases (MMP1, MMP2, MMP3, MMP9, MMP10, and MMP13). Topical treatment of injured mouse cornea with 0.1 mg/mL rTIMP2 significantly promoted corneal re-epithelialization and improved tissue integrity. The treatment suppressed the expression of inflammatory cytokines and MMPs, as well as the infiltration of neutrophils at the injury site. These findings indicate that TIMP2 promotes faster wound healing by suppressing injury-induced inflammation and MMP expression, suggesting a potential therapeutic target for corneal wound management.

Fish and bovine collagen promote higher migration and adhesion of dermal cells pre-treated with wound-healing herbal extracts

PURPOSE

Dermal cells fabricate and interact with the extracellular matrix to preserve structural integrity and further healthy function during wound healing. Collagen is a critical component of the matrix, challenging collagen's stability during wound injury. Natural sources especially plant extracts can promote wound healing and interact with collagen to increase its action. In this context, we studied the effect of extracted fish and bovine collagen in controlling cell proliferation, migration, and adhesion in dermal cells pretreated with plant extract.

METHODS

An acid-solubilization procedure was used to extract collagen fish (CF) and bovine (CB). Three different hydro-ethanolic extracts were prepared Pistacia lentiscus leaves (PL), Calendula officinalis leaves (FL), and flowers (FS). Migration potency was determined using scratch assay. The covered surface area was estimated after 16 hours and 24 hours after cell seeding. The chemotaxis was determined by the Boyden chamber, and the film was coated with CF or CB (10 µg/mL). or poly-L-lysine (50 µg/mL).

FINDINGS

We show that CF and CB increase adherence and migration of 3T3-L1 cells, which are pretreated with PL, FL, and FS. In addition, we highlighted a significantly higher cell adhesion on the CF matrix compared to CB. However, in the case of cells pre-treated with PL, the attachment to CF and CB increased significantly compared to untreated cells. The exposition of Hacat cells to plant extracts regulates the secretion of MMP2 and MMP and the production of reactive oxygen species.

CONCLUSION

CF and CB promote higher migration and adhesion of dermal cells pre-treated with wound-healing herbal extracts. In future studies, composite dressings based on collagen, P. lentiscus, and C. officinalis extracts can potentially be developed for tissue regeneration.

Cancer neuroscience in head and neck: interactions, modulation, and therapeutic strategies

Head and neck cancer (HNC) is an aggressive malignancy with significant effects on the innervation. Not only is it at the top of the cancer spectrum with a dismal prognosis, but it also imposes considerable stress on patients and society owing to frequent neurological symptoms. With progress in cancer neuroscience, the interactions between HNC and the nervous system, as well as the underlying mechanisms, have become increasingly clear. Compelling evidence suggests communication of information between cancer and nerve cells and devastation of the neurological system with tumor growth. However, the thorough grasp of HNC in cancer neuroscience has been severely constrained by the intricacy of HNC and fragmented research. This review comprehensively organizes and summarizes the latest research on the crosstalk between HNC and the nervous system. It aims to clarify various aspects of the neurological system in HNC, including the physiology, progression, and treatment of cancer. Furthermore, the opportunities and challenges of cancer neuroscience in HNC are discussed, which offers fresh perspectives on the neurological aspects of HNC diagnosis and management.

Matrix Metalloproteinases in Ureteropelvic Junction Obstruction: Their Role in Pathogenesis and Their Use as Clinical Markers

The obstruction of the urinary tract is responsible for obstructive nephropathy (ON), also known as uropathy, which may then evolve in a renal parenchymal disease (hydronephrosis). Regarding the etiology of ON, it has been linked to the perturbation of processes occurring during the urinary tract development such as morphogenesis, maturation, and growth. Despite the research carried out in recent years, there is still a pressing need to elucidate the molecular processes underlying the disease. This may then result in the definition of novel biomarkers that can help in patient stratification and the monitoring of therapeutic choices. Matrix metalloproteinases (MMPs) are a family of zinc-dependent endopeptidases with key roles in extracellular matrix remodeling due to their wide cleavage specificity and ability to modulate the bioavailability of growth factors. Despite the known changes in the local tissue microenvironment at the site of the urinary tract obstruction, the role of MMPs in ureteropelvic junction obstruction (UPJO) and, therefore, in the pathogenesis of renal damage in ON is not well-documented. In this review, we underline the possible roles of MMPs both in the pathogenesis of UPJO and in the progression of related hydronephrosis. The potential use of MMPs as biomarkers detectable in bodily fluids (such as the patient's urine) is also discussed.

Microenvironment-based immunotherapy in oral cancer: a comprehensive review

Oral cancer, a prevalent form of head and neck malignancy, accounts for 4% of global cancer cases. The most common type, oral squamous cell carcinoma (OSCC), has a survival rate of about 50%. Even though emerging molecular therapies show promise for managing oral cancer, current treatments like surgery, radiotherapy, and chemotherapy have significant side effects. In addition, the complex tumor microenvironment (TME), involving the extracellular matrix (ECM) and cells like fibroblasts and stromal cells like immune cells, promotes tumor growth and inhibits immune responses, complicating treatment. Nonetheless, immunotherapy is crucial in cancer treatment, especially in oral cancers. Indeed, its effectiveness lies in targeting immune checkpoints such as PD-1 and CTLA-4 inhibitors, as well as monoclonal antibodies like pembrolizumab and cetuximab, adoptive cell transfer methods (including CAR-T cell therapy), cytokine therapy such as IL-2, and tumor vaccines. Thus, these interventions collectively regulate tumor proliferation and metastasis by targeting the TME through autocrine-paracrine signaling pathways. Immunotherapy indeed aims to stimulate the immune system, leveraging both innate and adaptive immunity to counteract cancer cell signals and promote tumor destruction. This review will explore how the TME controls tumor proliferation and metastasis via autocrine-paracrine signaling pathways. It will then detail the effectiveness of immunotherapy in oral cancers, focusing on immune checkpoints, targeted monoclonal antibodies, adoptive cell transfer, cytokine therapy, and tumor vaccines.

The Presence of Adipose Tissue in Aortic Valves Influences Inflammation and Extracellular Matrix Composition in Chronic Aortic Regurgitation

Adipose tissue is present in aortic valves (AVs). Valve interstitial cells (VICs) could differentiate into adipogenic lineages. We here characterize whether the presence of adipose tissue in the AV influences inflammation and extracellular matrix (ECM) composition in patients with aortic regurgitation (AR). A total of 144 AVs were analyzed by histological and molecular techniques. We performed discovery studies using Olink Proteomics® technology in 40 AVs (N = 16 without and N = 24 with adipose tissue). In vitro, human white adipocytes (HWAs) or VICs were cultured with adipogenic media and co-cultured with control VICs. Of Avs, 67% presented white-like adipocytes within the spongiosa. Discovery studies revealed increased levels of inflammatory and ECM molecules in AVs containing adipocytes. Interestingly, the presence of adipocytes was associated with greater AV thickness, higher inflammation, and ECM remodeling, which was characterized by increased proinflammatory molecules, collagen, fibronectin, proteoglycans, and metalloproteinases. AV thickness positively correlated with markers of adipose tissue, inflammation, and ECM. In vitro, adipocyte-like VICs expressed higher levels of adipocyte markers, increased cytokines, fibronectin, decorin, and MMP-13. Analyses of supernatants from co-cultured control VICs with HWA or adipocyte-like VICs showed higher expression of inflammatory mediators, collagen type I, proteoglycans, and metalloproteinases. AVs presenting adipocytes were thicker and exhibited changes characterized by increased inflammation accompanied by aberrant expression of collagen, proteoglycans, and metalloproteinases. VICs could differentiate into adipogenic pathway, affect neighbor VICs, and contribute to inflammation, collagen and proteoglycan accumulation, as well as to metalloproteinases secretion. In summary, the presence of adipose tissue in AV could modify its composition, favoring inflammation and remodeling with an impact on AV thickness.

Intraplaque haemorrhage quantification and molecular characterisation using attention based multiple instance learning

Intraplaque haemorrhage (IPH) represents a critical feature of plaque vulnerability as it is robustly associated with adverse cardiovascular events, including stroke and myocardial infarction. How IPH drives plaque instability is unknown. However, its identification and quantification in atherosclerotic plaques is currently performed manually, with high interobserver variability, limiting its accurate assessment in large cohorts. Leveraging the Athero-Express biobank, an ongoing study comprising a comprehensive dataset of histological, transcriptional, and clinical information from 2,595 carotid endarterectomy patients, we developed an attention-based additive multiple instance learning (MIL) framework to automate the detection and quantification of IPH across whole-slide images of nine distinct histological stains. We demonstrate that routinely available Haematoxylin and Eosin (H&E) staining outperformed all other plaque relevant Immunohistochemistry (IHC) stains tested (AUROC = 0.86), underscoring its utility in quantifying IPH. When combining stains through ensemble models, we see that H&E + CD68 (a macrophage marker) as well as H&E + Verhoeff-Van Gieson elastic fibers staining (EVG) leads to a substantial improvement (AUROC = 0.92). Using our model, we could derive IPH area from the MIL-derived patch-level attention scores, enabling not only classification but precise localisation and quantification of IPH area in each plaque, facilitating downstream analyses of its association and cellular composition with clinical outcomes. By doing so, we demonstrate that IPH presence and area are the most significant predictors of both preoperative symptom presentation and major adverse cardiovascular events (MACE), outperforming manual scoring methods. Automating IPH detection also allowed us to characterise IPH on a molecular level at scale. Pairing IPH measurements with single-cell transcriptomic analyses revealed key molecular pathways involved in IPH, including TNF-α signalling, extracellular matrix remodelling and the presence of foam cells. This study represents the largest effort in the cardiovascular field to integrate digital pathology, machine learning, and molecular data to predict and characterize IPH which leads to better understanding how it drives symptoms and MACE. Our model provides a scalable, interpretable, and reproducible method for plaque phenotyping, enabling the derivation of plaque phenotypes for predictive modelling of MACE outcomes.

Circular RNA circDCUN1D4 suppresses hepatocellular carcinoma development via targeting the miR-590-5p/ TIMP3 axis

Hepatocellular carcinoma (HCC) is a major global health concern, necessitating innovative therapeutic strategies. In this study, we investigated the functional role of circular RNA circDCUN1D4 in HCC progression and its potential therapeutic implications. It was found that HCC patients exhibiting higher levels of circDCUN1D4 demonstrated a more favorable survival rate. Furthermore, we revealed that circDCUN1D4 suppressed HCC cell proliferation, migration, and invasion. Mechanistically, circDCUN1D4 was identified as a sponge for miR-590-5p, leading to the downregulation of its downstream target, Tissue Inhibitor of Metalloproteinase 3 (TIMP3). Importantly, circDCUN1D4 administration through In vivo jet-PEI exhibited a robust inhibitory effect on tumor progression without causing notable toxicity in mice. Overall, our findings highlight circDCUN1D4 as a promising therapeutic candidate for HCC, unraveling its intricate regulatory role through the miR-590-5p/TIMP3 axis. This study contributes valuable insights into the potential clinical applications of circRNA-based therapies for HCC.

Parabens exposure and its impact on diabesity: A review

Parabens are a family of alkyl esters of 4-hydroxybenzoic acid. The most commonly used include methylparaben, ethylparaben, propylparaben, and butylparaben. These compounds have been reported to disrupt the endocrine system and are believed to affect the central nervous, immune, and reproductive systems, as well as lipid homeostasis, glucose levels, and thyroid function. Given these effects, parabens pose potential health risks, including their possible link to conditions like diabesity - a term describing the dual condition of type 2 diabetes mellitus and obesity. This review explores current literature on how parabens may influence key mechanisms in diabesity, such as gluconeogenesis, glycogenolysis, adipogenesis, insulin resistance, and inflammation. Understanding their role in these metabolic pathways is critical for assessing their contribution to the diabesity epidemic and guiding future research for minimizing their harmful health impacts.

The impact of the tumor microenvironment in the dual burden of obesity-cancer link

Obesity induces systemic perturbations of tissue homeostasis, leading to dyslipidemia, insulin resistance and chronic state of inflammation. Evidence from clinical and preclinical studies links excess of adiposity with increased cancer incidence and suggests that chronic inflammation may contribute to increased cancer risk in obese patients. Over the last decades of obesity research, multifaced and complicated effects of abnormal or excessive expansion of Adipose Tissue have been uncovered. In particular, it is widely described how obesity can exacerbate the tumorigenesis for instance by fueling soluble signals and adipokines and by enhancing tissue inflammation and altering the hormonal balance. Less is known about the paracrine effects of the cancer-associated adipocytes on the tumor cells and still poorly explored is the reciprocal communication between cancer cells and the adipose component of the tumor microenvironment (TME). In this review, we will address the mechanisms by which the peritumoral Adipose Tissue can influence the dynamics of tumoral cells. We will discuss how obesity-induced changes in the tumor microenvironment may enhance tumor growth and aggressive characteristics leading to increased invasiveness and metastatic progression of cancer that leads to a worsen cancer survival in obese subjects. We conclude that targeting the peritumoral adipose component of the TME would be a therapeutic option to prevent cancer development.

Neutrophils in BCR::ABL1 negative MPN: Contributors or bystanders of fibrosis?

BCR::ABL1 negative myeloproliferative neoplasms (MPNs) are a heterogenous group of disorders characterized by clonal proliferation of hematopoietic stem and progenitor cells (HSPCs) within the bone marrow. Although the identification of somatic key driver mutations significantly increased both understanding and diagnostic accuracy of MPNs, many questions about the exact pathophysiology remain unanswered. Increased neutrophil count at diagnosis is a well-recognized predictor of worse disease evolution and survival, nonetheless the exact role of neutrophilic granulocytes within MPN pathophysiology is almost unexplored. As the majority of these cells are residing within the bone marrow, they represent a non-negligible entity within the bone marrow niche and its homeostasis. This review describes how neutrophils might contribute to the development of the inflammatory bone marrow niche, and hereby also fibrosis, associated with MPNs. The versatile functions and effects in different contexts emphasize the necessity for future research oriented to bone marrow in addition to peripheral blood.

Towards propagation of epidermal cells for wound repair: glass, as cell culture substrate, enhances proliferation and migration of human keratinocytes

Introduction

Human keratinocytes require relatively long propagation time which impedes their availability as autologous cell transplantation within a clinically reasonable timeframe. There is an unmet need for efficient xeno-free cell expansion approaches to propagate human keratinocytes as regenerative therapy.

Methods

Primary human keratinocytes and HaCaT cells were cultured on glass, plastic, and animal-derived collagen I matrix for 10 days. Proliferation, migration, DNA methylation, as well as gene and protein expression were assessed to characterize the effect of the tested culture substrates on keratinocytes at the molecular and functional levels.

Results

Keratinocytes cultured on glass exhibited faster proliferation, global DNA demethylation and upregulation of epidermal differentiation markers. Scratch wound assay revealed that keratinocytes cultured on glass demonstrated enhanced cell migration compared to those on plastic or collagen I. Multiplex immunoassays identified temporal and substrate-dependent variations in a panel of keratinocyte-specific secreted factors, encompassing immunomodulatory cytokines, growth factors, and angiogenic factors.

Discussion

Glass, as a culture substrate, promotes epidermal differentiation and enhances keratinocyte migration. The latter is a critical factor in re-epithelialization and wound healing. Functional properties suggest that glass may optimize the inflammatory response and promote efficient wound repair, making it a promising candidate for the short-term expansion of keratinocytes for transplantation purposes. Further in-vivo validation is required to definitively establish the efficacy of keratinocytes cultured on glass for clinical applications.

Developments in Extracellular Matrix-Based Angiogenesis Therapy for Ischemic Heart Disease: A Review of Current Strategies, Methodologies and Future Directions

Ischemic heart disease (IHD) is the leading cause of mortality worldwide, underscoring the urgent need for innovative therapeutic strategies. The cardiac extracellular matrix (ECM) undergoes extreme transformations during IHD, adversely influencing the heart's structure, mechanics, and cellular signaling. Researchers investigating the regenerative capacity of the diseased heart have turned their attention to exploring the modulation of ECM to improve therapeutic outcomes. In this review, we thoroughly examine the current state of knowledge regarding the cardiac ECM and its therapeutic potential in the ischemic myocardium. We begin by providing an overview of the fundamentals of cardiac ECM, focusing on the structural, functional, and regulatory mechanisms that drive its modulation. Subsequently, we examine the ECM's interactions within both chronically ischemic and acutely infarcted myocardium, emphasizing key ECM components and their roles in modulating angiogenesis. Finally, we discuss recent ECM-based approaches in biomedical engineering, focusing on different types of scaffolds as delivery tools and their compositions, and conclude with future directions for therapeutic research. By harnessing the potential of these emerging ECM-based therapies, we aim to contribute to the development of novel therapeutic modalities for IHD.

Engineered Drug-Amphiphile Conjugate Nanoparticles for Targeted Inhibition of AQP4-Mediated NLRP3 Inflammasome Signaling in Collagen-Induced Rheumatoid Arthritis

Aquaporins (AQPs) are transmembrane proteins that transport water, small solutes, and molecules across cell membranes. Studies have reported the role of AQPs in the activation, migration, and proliferation of immune cells, thus modulating the pathogenesis of autoimmune disease. In joints, the enhanced AQP4 expression exaggerates pathological changes like hydrarthrosis, acidosis, and hyperosmotic stress-inducing dysfunction of the articular chondrocytes, leading to articular cartilage destruction in collagen-induced arthritis (CIA). Acetazolamide (AZM), a sulfonamide carbonic anhydrase inhibitor of AQP4, reversibly decreases water permeability through AQP4 and is a potential molecule for targeting AQP4 in the CIA. However, its low solubility and low bioavailability limit its therapeutic effectiveness. Therefore, in this study, we have synthesized a polyphenol drug (gallic acid) (GA) and an amphiphile (glycerol monostearate) (GMS) conjugate to self-assemble into nanoparticles and encapsulated with AZM. Apart from AZM, GA is known for its antioxidant and anti-inflammatory properties. Therefore, intra-articular injection of AZM@GA-GMS NPs efficiently downregulates the expression of AQP4 and associated NLRP3 inflammasome activation. Moreover, the NPs are cytocompatible and showed enzyme-responsive drug release and thus offer a promising therapeutic strategy for RA by inhibiting AQP4-mediated inflammatory pathways. This opens up an avenue for treatment for RA.

Evaluation of the causal relationship between 28 circulating biomarkers and osteoarthritis : a bidirectional Mendelian randomization study

Aims

Circulating biochemistry markers are commonly used to monitor and detect disease-induced dysfunctions including osteoarthritis (OA). However, the causal nature of this relationship is nevertheless largely unknown, due to unmeasured confounding factors from observational studies. We aimed to reveal the causal relationship between 28 circulating biochemistry markers and OA pathogenesis.

Methods

We conducted a comprehensive bidirectional two-sample Mendelian randomization (MR) study between 28 circulating biomarkers and six OA types, using large-scale genome-wide association study (GWAS) summary statistics data from a UK Biobank cohort (n = 450,243) and the latest OA meta-analysis (n = 826,690). We replicated the significant results of low-density lipoprotein cholesterol (LDL-C) and total cholesterol (TC) in an independent large GWAS dataset obtained from the Global Lipids Genetics Consortium (GLGC) (n > 800,000).

Results

Using 73 to 792 instrumental variables for biomarkers, this large MR analysis identified 11 causal associations at the Bonferroni corrected significance level of 2.98 × 10-4, involving seven biomarkers and five OA types. LDL-C (odds ratio (OR) per SD increase 0.90, 95% CI 0.86 to 0.93), apolipoprotein B (OR 0.86, 95% CI 0.82 to 0.91), TC (OR 0.90, 95% CI 0.86 to 0.94), calcium (OR 0.82, 95% CI 0.75 to 0.90), and glucose (OR 0.81, 95% CI 0.73 to 0.89) are causally associated with a reduced risk of OA, while phosphate (OR 1.18, 95% CI 1.08 to 1.30) and aspartate aminotransferase (OR 1.15, 95% CI 1.07 to 1.24) are causally associated with an increased risk. Analysis of GLGC summary statistics successfully replicated LDL-C (OR 0.93, 95% CI 0.90 to 0.96) and TC (OR 0.92, 95% CI 0.89 to 0.95).

Conclusion

This comprehensive bidirectional MR analysis provides new insights into the prevention and treatment of OA, as well as understanding the biological mechanism underlying OA pathogenesis.

Proteomic Profiling and Clinical Insights: The Role of MMP9 in Differentiating Psoriasis Vulgaris from Generalized Pustular Psoriasis

Background

Generalized pustular psoriasis (GPP) constitutes a rare, severe inflammatory disorder that differs from psoriasis vulgaris (PV). The IL-36 pathway has been identified as a key element in GPP pathogenesis.

Objective

To explore protein expression between PV and GPP, providing insights into potential mechanisms.

Methods

We performed proteomic analysis of tissue specimens from patients with PV and GPP to identify differentially expressed proteins. Comparative analysis of the proteomic data was performed and proteins with significant differences were further identified using immunofluorescence and Western blot techniques. Differential proteins were also explored by evaluating the efficacy of IL-36R inhibitors before and after GPP treatment, providing potential avenues for targeted therapeutic strategies.

Results

Tissue proteomic profiling showed that matrix metallopeptidase 9 (MMP9) increased significantly in the GPP as compared to PV. Immunofluorescence and Western blot analysis confirmed that MMP9 is higher expressed in GPP. And after therapy with IL-36 inhibitors showed that the level of MMP9 expression was markedly reduced.

Conclusion

MMP9 may be involved with the pathogenesis of GPP.

TIMP2 rs2277698 polymorphism associated with adverse IVF outcomes in Han Chinese women

Background

Matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) are critical regulators of extracellular matrix (ECM) proteolysis and play a pivotal role in trophoblast invasion during embryo implantation. This study aimed to investigate the effects of single-nucleotide polymorphisms (SNPs) in MMP and TIMP genes on clinical outcomes in women undergoing in vitro fertilization (IVF).

Methods

This retroprospective study included 1014 women undergoing their first fresh IVF cycle without donor eggs at Lee Women's Hospital between January 2014 and December 2015. Peripheral blood samples were collected from all participants for DNA extraction and SNP genotyping using real-time polymerase chain reaction. The study focused on three SNPs: TIMP1 (rs4898 C/T), TIMP2 (rs2277698 C/T), and MMP2 (rs243865 C/T). Associations between these SNPs and IVF outcomes, including clinical pregnancy, embryo implantation, abortion, and live birth rates, were analyzed.

Results

Among 560 patients analyzed, no significant differences were observed in baseline characteristics between the live birth and non-live birth groups. However, the minor alleles (CT+TT) of MMP2 (rs243865) and TIMP2 (rs2277698) were significantly more frequent in the non-live birth group (MMP2: 24.4% vs. 17.7%, p = 0.044; TIMP2: 48.1% vs. 34.4%, p = 0.001). In contrast, no significant differences in the genotype distribution of TIMP1 (rs4898) were noted between the groups. Logistic regression analysis identified the minor T allele of TIMP2 as a significant predictor of non-live birth (adjusted odds ratio: 1.725; 95% CI: 1.217-2.445; p = 0.002). Combined genotypes of MMP2/TIMP2, such as CC/CT+TT and CT+TT/CT+TT, were associated with an increased risk of non-live birth, even after adjusting for covariates.

Conclusions

The study demonstrates that the minor T allele of TIMP2 (rs2277698 C/T) is associated with poor IVF outcomes, particularly non-live birth. This finding highlights the potential role of genetic variations in TIMP2 in influencing clinical outcomes of IVF. Further research is warranted to elucidate the underlying mechanisms in larger and more diverse populations.

Network Pharmacology, Molecular Docking and Experimental Validation on Potential Application of Diabetic Wound Healing of Cinnamomum zeylanicum Through Matrix Metalloproteinases-8 And 9 (MMP-8 And MMP-9)

Background

Diabetic wounds are a significant clinical challenge due to impaired healing processes often exacerbated by elevated matrix metalloproteinases (MMPs). Cinnamomum zeylanicum, known for its anti-inflammatory and antioxidant properties, has shown potential in promoting wound healing. This study investigates the molecular docking and experimental validation of Cinnamomum zeylanicum's effects on diabetic wound healing, focusing on its interaction with matrix metalloproteinases-8 (MMP-8) and 9 (MMP-9).

Methods

Molecular docking studies were performed to predict the binding affinity of Cinnamomum zeylanicum compounds to MMP-8 and MMP-9. Diabetic wound healing was evaluated using in vivo models where wounds were induced and treated with Cinnamomum zeylanicum extract. Various parameters were measured, including wound contraction, hydroxyproline content, superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), and malondialdehyde (MDA) levels. Biochemical analyses included glucose levels, fasting blood glucose (FBG), oral glucose tolerance test (OGTT), and histomorphological examination of skin tissues.

Results

Molecular docking results indicated a high binding affinity of Cinnamomum zeylanicum's bioactive compounds with MMP-8 and MMP-9, suggesting potential inhibition. Experimental validation showed significant improvement in wound contraction and increased hydroxyproline content, indicating enhanced collagen synthesis. Antioxidant enzyme activities (SOD, GPx, CAT) were significantly elevated, while MDA levels were reduced, reflecting decreased oxidative stress. Biochemical analysis demonstrated improved glucose homeostasis with reduced FBG and enhanced OGTT responses. Histomorphological studies revealed improved tissue architecture and re-epithelialization in treated wounds.

Conclusion

Cinnamomum zeylanicum exhibits promising potential in diabetic wound healing by modulating MMP-8 and MMP-9 activities, enhancing antioxidant defenses, and improving glucose regulation. These findings support its therapeutic application for diabetic wounds, providing a foundation for further clinical investigations.

Association of the TGFB1 Gene Polymorphisms with Pain Symptoms and the Effectiveness of Platelet-Rich Plasma in the Treatment of Lateral Elbow Tendinopathy: A Prospective Cohort Study

The regenerative properties of platelet-rich plasma (PRP) result from the high concentration of growth factors, including transforming growth factor beta 1 (TGF-β1). Nevertheless, this form of therapy may not always be effective due to the variability in genetic factors. In this study, the association of TGFB1 gene polymorphisms with the effectiveness of lateral elbow tendinopathy (LET) treatment with PRP was investigated. The effectiveness of therapy was assessed using minimal clinically important difference (MCID) and patient-reported outcome measures (PROM), specifically visual analog scale (VAS), quick version of disabilities of the arm, shoulder, and hand score (QDASH), and patient-rated tennis elbow evaluation (PRTEE) for two years (in weeks 2, 4, 8, 12, 24, 52, and 104). The most effective therapy was noticed in CC rs2278422 genotype carriers, whereas carriers of AA, CC, and CC genotypes (rs12461895, rs4803455, rs2241717) showed more severe pain before therapy. Moreover, the analyses revealed an association of studied polymorphisms with such parameters of blood morphology as eosinophils (EOS), neutrophils (NEU), and monocytes (MONO). In conclusion, genotyping of rs2278422 variant may be a valuable diagnostic method for patient selection for PRP therapy, while genotyping of rs12461895, rs4803455, and rs2241717 polymorphisms may be used for prediction of increased risk of pain sensation.

Anticancer Activity of Melittin-Containing Bee Venom Fraction Against Glioblastoma Cells In Vitro

Previous observations indicating a lower incidence of various types of cancer in beekeepers suggest that greater exposure to stings reduces the risk of cancer development. However, it is not known which of the active compounds of the bee venom (BV) may be responsible for the observed properties. The aim of this study is to evaluate the anti-glioblastoma effect of the main BV fractions. In addition, the effect of BV fractions on the activity of matrix metalloproteinases 2 and 9 (MMP-2 and MMP-9) was assessed. Commercially available BV was divided into three fractions containing one of the main BV components: apamin (fraction #1), phospholipase A2 (fraction #2), or melittin (fraction #3). The viability of glioblastoma lines (LN18 and LN229) compared to a physiological line (human MO3.13) was assessed using the MTT. MMP-2 and MMP-9 activity was assessed using gelatin zymography. Tissue inhibitors of metalloproteinases 1 and 2 (TIMP-1 and TIMP-2) levels in cell culture media were measured with the ELISA method. The fraction containing apamin did not show cytotoxic activity up to a concentration of 100 µg/mL. The fraction containing phospholipase A2 partially reduced the cells' viability at a concentration of 100 µg/mL. The greatest activity was demonstrated by the melittin-containing fraction which completely reduced the viability of glioma cells from a concentration of 2.5 μg/mL and inhibited the activity of the assessed metalloproteinases in a dose-dependent manner. After 72 h of incubation, the highest concentrations of TIMP-1 and TIMP-2 (approximately 150 ng/mL and 100 ng/mL, respectively) were observed in the LN229 line. In all tested lines, fraction #3, crude BV, and melittin reduced the secretion of both inhibitors into the medium in a dose-dependent manner. The melittin-containing fraction possessed anti-glioma properties in vitro, suggesting that melittin may be the main anticancer compound of BV.

Biomarkers of cellular senescence predict risk of mild cognitive impairment: Results from the lifestyle interventions for elders (LIFE) study

OBJECTIVES

Cellular senescence, characterized by a marked and multifactorial senescence-associated secretory phenotype (SASP), is a potential unifying mechanism of aging and chronic disease. Most studies of the SASP have focused on frailty and other functional outcomes. Senescent cells have been detected in the brains of patients with Alzheimer's disease, but few studies have examined associations between plasma SASP markers and cognition. The objective of this study was to examine the cross-sectional and longitudinal associations between plasma SASP markers and mild cognitive impairment among older adults at high risk of mobility disability.

DESIGN

The Lifestyle Interventions for Elders (LIFE) study was a randomized controlled trial of a group-based physical activity program compared to a "successful aging" health education program to assess effects on major mobility disability that was conducted from February 2010 to December 2013.

SETTING

Recruitment occurred at eight centers in the United States.

PARTICIPANTS

We included 1,373 participants enrolled in the study with baseline measures of 27 biomarkers of cellular senescence and adjudication of mild cognitive impairment (MCI) and dementia at baseline and 24-month follow-up. At baseline, participants were aged 70-80, sedentary, and at high risk of mobility disability.

MEASUREMENTS

A neuropsychological assessment was administered at baseline and 24 months post-randomization. At both timepoints, a clinical adjudication committee determined whether individuals had a diagnosis of cognitively normal, MCI, or dementia; individuals with dementia at baseline were excluded. The concentrations of 26 of the 27 plasma proteins identified as components of the SASP were measured with commercially available Luminex xMAP multiplex magnetic bead-based immunoassays analyzed on the MAGPIX System while 1 protein (Activin A) was measured using an enzyme-linked immunosorbent assay.

RESULTS

Logistic regression models were used to examine the associations of each senescence biomarker, in quartiles, with baseline or incident MCI. Models stratified by clinical site and adjusted for intervention assignment, age, gender, race, and education. Among 1,373 participants, 117 (8.5%) were diagnosed with MCI at baseline. Increasing quartiles of myeloperoxidase (MPO) was associated with higher odds of MCI compared to quartile 1 (Q2: OR = 1.34, 95% CI: 0.74-2.45; Q3: OR = 1.43, 95% CI: 0.80-2.59; Q4: OR = 1.79, 95% CI: 1.02-3.22). Additionally, matrix metalloproteinase 1 (MMP1) quartiles 2-4 had lower odds of MCI compared to quartile 1 (Q2: OR = 0.61, 95% CI: 0.35-1.02; Q3: OR = 0.58, 95% CI: 0.33-0.98; Q4: OR = 0.64, 95% CI: 0.37-1.08). Of the 1,256 cognitively unimpaired participants at baseline, 141 (11.2%) were diagnosed with incident MCI or dementia at the 24-month follow-up. Compared to quartile 1, increasing baseline quartiles of MPO (Q2: OR = 1.10, 95% CI: 0.63-1.92; Q3: OR = 1.36, 95% CI: 0.80-2.33; Q4: OR = 1.92, 95% CI: 1.16-3.25) and matrix metalloproteinase 7 (MMP7, Q2: OR = 0.88, 95% CI: 0.47-1.62; Q3: OR = 1.46, 95% CI: 0.85-2.55; Q4: OR = 2.14, 95% CI: 1.28-3.65) were associated with increased odds of MCI or dementia at 24 months.

CONCLUSIONS

Among older adults at high risk of mobility disability, high plasma MPO was cross-sectionally and, along with MMP7, longitudinally associated with increased odds of MCI and dementia. In contrast, high MMP1 was cross-sectionally associated with reduced odds of MCI.

Nanophotonic-enhanced photoacoustic imaging for brain tumor detection

Photoacoustic brain imaging (PABI) has emerged as a promising biomedical imaging modality, combining high contrast of optical imaging with deep tissue penetration of ultrasound imaging. This review explores the application of photoacoustic imaging in brain tumor imaging, highlighting the synergy between nanomaterials and state of the art optical techniques to achieve high-resolution imaging of deeper brain tissues. PABI leverages the photoacoustic effect, where absorbed light energy causes thermoelastic expansion, generating ultrasound waves that are detected and converted into images. This technique enables precise diagnosis, therapy monitoring, and enhanced clinical screening, specifically in the management of complex diseases such as breast cancer, lymphatic disorder, and neurological conditions. Despite integration of photoacoustic agents and ultrasound radiation, providing a comprehensive overview of current methodologies, major obstacles in brain tumor treatment, and future directions for improving diagnostic and therapeutic outcomes. The review underscores the significance of PABI as a robust research tool and medical method, with the potential to revolutionize brain disease diagnosis and treatment.

The Genetic and Biological Basis of Pseudoarthrosis in Fractures: Current Understanding and Future Directions

Pseudoarthrosis-the failure of normal fracture healing-remains a significant orthopedic challenge affecting approximately 10-15% of long bone fractures, and is associated with significant pain, prolonged disability, and repeated surgical interventions. Despite extensive research into the pathophysiological mechanisms of bone healing, diagnostic approaches remain reliant on clinical findings and radiographic evaluations, with little innovation in tools to predict or diagnose non-union. The present review evaluates the current understanding of the genetic and biological basis of pseudoarthrosis and highlights future research directions. Recent studies have highlighted the potential of specific molecules and genetic markers to serve as predictors of unsuccessful fracture healing. Alterations in mesenchymal stromal cell (MSC) function, including diminished osteogenic potential and increased cellular senescence, are central to pseudoarthrosis pathogenesis. Molecular analyses reveal suppressed bone morphogenetic protein (BMP) signaling and elevated levels of its inhibitors, such as Noggin and Gremlin, which impair bone regeneration. Genetic studies have uncovered polymorphisms in BMP, matrix metalloproteinase (MMP), and Wnt signaling pathways, suggesting a genetic predisposition to non-union. Additionally, the biological differences between atrophic and hypertrophic pseudoarthrosis, including variations in vascularity and inflammatory responses, emphasize the need for targeted approaches to management. Emerging biomarkers, such as circulating microRNAs (miRNAs), cytokine profiles, blood-derived MSCs, and other markers (B7-1 and PlGF-1), have the potential to contribute to early detection of at-risk patients and personalized therapeutic approaches. Advancing our understanding of the genetic and biological underpinnings of pseudoarthrosis is essential for the development of innovative diagnostic tools and therapeutic strategies.

Long circulating XTEN864-HGV-Apoptin fusion protein for selective cancer therapy

The virus protein CAV-Apoptin and its homologue HGV-Apoptin selectively kill cancer cells but are not suitable for systemic treatment. The aim was to develop Apoptin-based fusion proteins for intravenous application in cancer therapy, which also contain the hydrophilic polypeptide XTEN, a cleavage site for MMP-2/9, and a TAT peptide for cell penetration. Expression of XTEN864-HGV-Apoptin in E. coli and purification using XTEN as a tag yielded 100 mg protein/L tissue culture. The expression of XTEN864-CAV-Apoptin did not generate a sufficient yield. Cytotoxic effects were assessed using MTT and Annexin A5 assays, whereas cellular uptake was visualized using Cy3.5-XTEN864-HGV-Apoptin. Blood half-life and biodistribution were evaluated with 99mTc-XTEN864-HGV-Apoptin using SPECT-CT and gamma counting. The fusion protein significantly reduced cancer cell growth and induced apoptosis with minimal effects on non-cancerous cells. It accumulates in the nucleus and associates with F-actin. In mice, the protein showed a blood half-life of 0.68 (fast phase) and 17 h (slow phase), with a tumor/muscle ratio of 9.36 ± 6.22 (SD). In a 4 T1 mouse tumor model, it effectively inhibited tumor growth. The cancer-specific cytotoxicity and prolonged circulation of XTEN864-HGV-Apoptin suggest its potential for systemically applicable, biodegradable, and E. coli-producible antitumor drugs.

Peptide‑based therapeutic strategies for glioma: Current state and prospects

Glioma is a prevalent form of primary malignant central nervous system tumor, characterized by its cellular invasiveness, rapid growth, and the presence of the blood-brain barrier (BBB)/blood-brain tumor barrier (BBTB). Current therapeutic approaches, such as chemotherapy and radiotherapy, have shown limited efficacy in achieving significant antitumor effects. Therefore, there is an urgent demand for new treatments. Therapeutic peptides represent an innovative class of pharmaceutical agents with lower immunogenicity and toxicity. They are easily modifiable via chemical means and possess deep tissue penetration capabilities which reduce side effects and drug resistance. These unique pharmacokinetic characteristics make peptides a rapidly growing class of new therapeutics that have demonstrated significant progress in glioma treatment. This review outlines the efforts and accomplishments in peptide-based therapeutic strategies for glioma. These therapeutic peptides can be classified into four types based on their anti-tumor function: tumor-homing peptides, inhibitor/antagonist peptides targeting cell surface receptors, interference peptides, and peptide vaccines. Furthermore, we briefly summarize the results from clinical trials of therapeutic peptides in glioma, which shows that peptide-based therapeutic strategies exhibit great potential as multifunctional players in glioma therapy.