Current Pharmaceutical Design - Online First

Disorders of mood and post-traumatic stress disorder (PTSD) are common after major trauma, and one of the treatments used is Tricyclic Antidepressants (TCA). These medications work by inhibiting the re-uptake of neurotransmitters like serotonin and noradrenaline. Serotonin is known to have measurable effects on bone tissue due to the presence of specific receptors on bone cells. However, there are conflicting reports about how serotonin signaling affects bone tissue and the process of fracture healing. This study aimed to evaluate the effect of TCAs on fracture healing.

Twelve skeletally mature Wistar rats were used in the study. All rats underwent intra-medullary pinning of the right tibia, and a complete mid-diaphyseal fracture was created. The rats were then randomly split into two groups: a control group and a study group. For twenty-eight days, the study group received a daily dose of 10 mg/kg of amitriptyline via intraperitoneal infusion, while the control group received an equal volume of plain saline via the same route. On day twenty-eight, five hours after the final dose, all rats were euthanized to assess fracture healing using radiological, microscopic, and histological methods.

The study found a significant difference in the total volume of new bone formation between the two groups on day twenty-eight. The control group had a mean bone formation volume of 1.077 mm³, whereas the amitriptyline-treated group had a significantly higher mean volume of 1.824 mm³ (p<0.01).

The results suggest that TCAs positively influence the early phases of fracture healing. The increased new bone formation observed in the amitriptyline group indicates a potential therapeutic benefit beyond their known psychiatric effects. This finding adds to the existing literature on the complex relationship between serotonin signaling and bone metabolism, providing evidence that this class of antidepressants may enhance the process of bone repair.

Tricyclic Antidepressants, specifically amitriptyline, significantly increase new bone formation in the early stages of fracture healing in Wistar rats.

Salvianolic acid B (SAB), as one of the major water-soluble compounds of Salvia miltiorrhiza, has proved to effectively reduce elevated portal pressure in cirrhotic rats. However, the short half-life and in vivo retention time of SAB affect its pharmacodynamics. Therefore, in this study, we prepared albumin nanoparticles loaded with SAB (SAB-ALB-NPs) to improve the in vivo retention time of the drug and enhance bioavailability.

We prepared and characterized SAB-ALB-NPs, including particle size, polydispersity index (PDI), zeta potential, stability, EE, in-vitro release, and pharmacokinetics. Subsequently, we investigated the effects and potential mechanisms of SAB-ALB-NPs in CCl4-induced portal hypertension (PHT) mice models, and it was found that angiotensin-II (Ang-II) induced proliferation and contraction in hepatic stellate cells (HSCs). The CCl4 (0.3:1 in corn oil, 1mL/kg) was injected repeatedly, leading to the PHT mice model. The effect of SAB-ALB-NPs on PHT mice was evaluated by hematoxylin-eosin, Sirius red staining, immunohistochemistry, and Western blot.

We successfully prepared SAB-loaded albumin nanoparticles with smaller-sized particles, lower PDI and zeta potential with stable properties, and higher EE. Importantly, the SAB-ALB-NPs notably prolonged the in vitro release of SAB. SAB-ALB-NPs significantly reduced portal pressure, inhibited inflammation (decrease the concentration of TNF-α and IL-6) and hepatotoxicity of the liver (down-regulated the level of ALT and AST) against fibrous tissue hyperplasia, and reduced collagen deposition in the liver. Afterward, we used Ang-II to facilitate the proliferation of HSCs and induce HSC cell contraction. Cotreatment of SAB-ALB-NPs markedly inhibited Ang II-induced effects on cell proliferation and contraction and improved apoptosis. Importantly, SAB-ALB-NPs were preliminarily found to inhibit the expression of RhoA and ROCK II in Ang-II-treated HSC and CCl4-induced PHT mice, suggesting that SAB-ALB-NPs may participate in the regulation of RhoA/ROCK II pathway.

SAB-ALB-NPs improved portal hypertension by suppressing inflammation and inhibiting HSCs activation and proliferation to attenuate liver fibrosis. This therapeutic function of SAB-ALB-NPs may be owing to SAB-ALB-NPs regulating the RhoA/ROCK2 pathway, which may be one of its molecular mechanisms for reducing portal hypertension.

Recent studies indicate that niclosamide demonstrates considerable promise as both an anthelmintic agent and a possible anticancer medication. Given the increasing interest in nano-sized drug delivery methods for cancer therapy, lipid nanocapsules (LNCs) have emerged as a viable approach to enhance the bioavailability of poorly soluble pharmaceuticals due to their beneficial properties. This research intends to develop niclosamide-loaded lipid nanocapsules (NIC-LNCs) using the phase inversion technique, followed by the optimization of these formulations via the Box-Behnken experimental design.

A reverse-phase high-performance liquid chromatography (RP-HPLC) method was devised and validated for quantifying niclosamide in the LNC formulations. Optimal chromatographic separation was attained utilizing an Agilent Eclipse XDB-C18 column (150×4.6 mm, 5 µm i.d.) with a mobile phase of a 50:50 (v/v) mixture of acetonitrile and 0.1% H3PO4 phosphate buffer, at a flow rate of 1.2 mL/min. The detection wavelength was set at 335 nm, and the analysis was performed at 35°C. The developed analytical methodology was validated through a comprehensive evaluation of accuracy, linearity, precision, limit of detection, limit of quantitation, specificity, and stability.

The optimization of the NIC-LNC formulation through the Box-Behnken design resulted in an optimal formulation labeled LNC5, consisting of 4% niclosamide, 20% lipid, and 20% surfactant. The proven RP-HPLC method enables accurate quantification of NIC in the LNC formulations. The refined NIC-LNC formulation exhibited developed attributes as assessed by the design.

NIC-LNCs were successfully prepared with particle sizes below 100 nm, narrow size distributions (PDI<0.2), and negative zeta potential values in accordance with the literature. All formulations exhibited high encapsulation efficiency and sustained drug release profiles. The optimum formulation revealed a particle size of 43.29 ± 0.32 nm, encapsulation efficiency of 99.99 ± 0.02%, and drug release at one week of 68.85 ± 1.76%. The formulation maintained stability throughout the short-term study period.

The findings indicate that LNC systems are a promising method for drug administration, especially for anticancer drugs with limited solubility in water.

Cervical cancer (CC) is among the most prevalent cancers affecting women globally, with a substantial number of deaths reported annually. Despite advancements in treatment, the persistently high mortality rate underscores the urgent need for novel and effective therapeutic strategies.

This study screened a library of 240 flavonoids against maternal embryonic leucine zipper kinase (MELK) and LYN using molecular docking methods to achieve precise calculations. These proteins play critical roles in CC progression, and their simultaneous inhibition could mark a significant step forward in multitargeted drug design.

Molecular docking revealed binding affinities ranging from -10.0649 to -8.14296 kcal/mol for MELK and -10.2748 to -8.5237 kcal/mol for LYN. The screening process was complemented by pharmacokinetics and interaction fingerprinting analyses, which confirmed that the flavonoids effectively bound to optimal sites, forming stable complexes through multiple interactions. Molecular dynamics simulations extended to 100 ns further validated the stability of these protein-ligand complexes.

The findings indicate that the top-ranked compounds exhibit strong binding affinities and stable interactions, highlighting their potential as multitargeted therapeutic agents against CC.

These findings set the stage for future experimental and clinical studies to validate our results and facilitate the development of novel, flavonoid-based therapeutic strategies against cervical cancer, potentially revolutionizing the treatment landscape of this disease.

Ovarian cancer (OC) is a malignancy of the female reproductive system for which cisplatin chemotherapy is one of the first-line treatments. Despite the initial response to chemotherapy, such patients eventually develop resistance, which poses a major obstacle to treatment, along with potential side effects. Phytochemicals function as chemosensitizers, offering novel therapies in OC patients by targeting drug resistance, and are perceived to be less toxic. Plumbagin has emerged as an anticancer compound, with some findings suggesting its anti-ovarian cancer activity. However, there is no study on the potential of plumbagin to target cisplatin resistance in non-high-grade OC. The current study aimed to determine the antitumor activity of plumbagin for cisplatin resistance in OC cells in vitro, and to identify its potential molecular target for therapeutic benefit using in silico studies.

Plumbagin was used for in vitro cytotoxic effects on cisplatin-resistant (A2780-CR) and sensitive (A2780-CS) isogenic cell lines using a crystal violet cell viability assay. The binding of plumbagin to the nine selected molecular targets was estimated by molecular docking and their binding energies were compared. The stabilities of the selected docked complexes were confirmed by molecular dynamics simulation (MDS) and molecular mechanics generalized born surface area (MM-GBSA) calculations, and conclusions were drawn to predict the inhibition potential of plumbagin to its best targets.

Plumbagin demonstrated the potential to kill A2780-CR cells, and, expectedly, the cell death effect on A2780-CS ovarian cancer cells demonstrated its anti-tumor activity in vitro. It was found to be non-effective in killing normal non-tumorigenic RPE cells, even at higher doses. Docking analysis suggested that it potentially inhibits through various pharmacological targets with high affinity for binding to Chk1 (PDB ID=1ia8) and Aurora Kinase (PDB ID=5ORL). Molecular dynamic simulation data revealed strong and stable protein-ligand complex formation, which was measured in terms of root mean square deviation (RMSD), root mean square fluctuation (RMSF), and radius of gyration (Rg). On the other hand, the MM-GBSA study revealed that the binding free energy of the CT1019-1ia8 complex (-84.26 ± 2.99 Kcal/mol) and CT1019-5ORL (-67.04 ± 2.63 Kcal/mol) was better when compared to other complexes.

Plumbagin showed anti-ovarian cancer benefits in cisplatin-resistant ovarian cells, and the potential pharmacological targets identified were Chk1 and Aurora kinase.

Our study offers promising insights into plumbagin, particularly in combating cisplatin-resistance OC. However, further in vivo and mechanistic studies are required to validate plumbagin's potential as a therapeutic candidate for OC treatment.

Ibrutinib is a selective tyrosine kinase inhibitor used to treat chronic lymphocytic leukemia (CLL). However, it has low oral bioavailability (2.9%), which is attributed to low solubility (0.002 mg/mL) and a first-pass effect. Ibrutinib-loaded nanostructured lipid carriers (IBR-NLCs) were prepared and investigated in this study to overcome the solubility and presystemic metabolism issues. The goal of the current study was to formulate IBR-NLCs for enhanced bioavailability. IBR-NLCs were optimized using a 3² factorial design and evaluated using various in vitro and in vivo parameters.

IBR interaction with solid lipid (Glyceryl monostearate) and liquid lipid (oleic acid) was studied using molecular docking. The hot-melt ultrasonication method was used to formulate IBR-NLCs, and a 3² factorial design was used for optimization. Particle size, PDI, zeta potential, entrapment efficiency, DSC, XRD, FTIR, SEM, and in vitro study were used to evaluate the NLCs. HepG2 cell lines were used to study the in vitro cytotoxicity of IBR-NLCs and IBR suspension. IBR-NLCs were administered to male Wistar rats in the presence and absence of cycloheximide (CXI) to compare pharmacokinetic parameters.

Molecular docking confirmed good interaction between IBR-GMS and IBR-oleic acid. The optimized IBR-NLCs exhibited particle sizes, PDI, zeta potentials, and %EE of 154.5 ± 0.7 nm, 0.2 ± 0.0, -25.8 ± 1.1 mV, and 84.0 ± 1.2%, respectively. Differential Scanning Calorimetry (DSC) reveals the development of molecular dispersion of IBR in the melted lipid matrix, and X-Ray Diffraction (XRD) studies show a decline in the crystalline drug peaks in the formulation's diffractogram. SEM images showed uniformity distributed spherical-shaped particles. According to an in vitro investigation, IBR-NLCs exhibited a sustained release pattern of 98.0 ± 0.5% with a Korsmeyer-Peppas model mechanism (R² = 0.9615). The IC50 values of IBR suspension and IBR-NLCs were 4.155 µg/mL and 3.03 µg/mL. The AUC0-24 of IBR-NLCs administered in the absence of CXI was 1.60 times higher than the AUC0-24 values in the presence of CXI, indicating lymphatic transport.

IBR-NLCs appear to be promising as a novel innovative nanocarrier for the management of CLL.

Ovarian cancer (OC) is a common malignant tumor of the female reproductive system and is usually found at an advanced stage. However, the treatment of OC with conventional the efficacy of surgery and chemotherapy is limited. Brusatol (BRU) is a unique nuclear factor erythroid 2-related factor 2 (Nrf2) pathway inhibitor with significant anti-cancer effects. At the same time, the Nrf2 system also plays a vital role in ferroptosis, which can be used as a new way to treat tumors. This study investigated the mechanism of action of BRU as a novel ferroptosis inducer to inhibit OC cells.

Using bioinformatics to screen for key targets and pathways that act on OC in BRU, and then the effects of BRU on OC cells were examined by cell viability assay, clone formation assay, wound healing assay, and apoptosis assay. The intracellular levels of ROS (Reactive Oxygen Species), Fe²⁺, glutathione (GSH), and malondialdehyde (MDA) were also quantified. Western blotting analysis was then performed to verify ferroptosis marker proteins and pathways. In addition, the combination of Ferrostatin-1 (Fer-1) and BRU was further tested for ferroptosis-related markers.

By obtaining BRU and OC targets, 171 potential BRU-OC action targets were screened to the core target NQO1. KEGG enrichment analysis showed that the anticancer effects of IBC were mediated through multiple pathways, including the PI3K-AKT and Ras signaling pathways. In vitro results showed that IBC inhibited the proliferation, invasion, and migration of OC cells and induced ferroptosis in OC cells.

We demonstrated that BRU increased intracellular ROS, Fe^2+, and MDA levels. It also significantly reduced intracellular GSH level and the expression of two marker proteins for ferroptosis, GPX4 and SLC7A11. Meanwhile, BRU could inhibit the Nrf2/HO-1/NQO1 and AKT/mTOR dual signaling pathways in OC cells. Furthermore, the combination of Ferrostatin-1 (Fer-1) and BRU reversed BRU-induced ferroptosis in OC cells.

In this study, we demonstrated for the first time through bioinformatics, molecular docking technology, and experimental validation that BRU acts as a novel inducer of ferroptosis in ovarian cancer cells by targeting the Nrf2/HO-1/NQO1 and AKT/mTOR dual signaling pathways, and may have great potential in the treatment of ovarian cancer cells.

Crizotinib, an inhibitor of the epidermal growth factor receptor (EGFR) tyrosine kinase, holds significant potential for the treatment of lung cancer. However, its toxicities present a major challenge to its clinical use. To enhance the targeted delivery of Crizotinib to lung tumors, polymeric-based nanoparticles were developed.

Crizotinib-loaded polymeric nanoparticles were prepared using a nano-precipitation method, incorporating stearic acid as the lipid, polyethylene glycol as the polymer, and Tween 80 as the surfactant. Key formulation parameters were optimized to achieve high-quality nanoparticles.

The optimized formulation exhibited a mean particle size of 142 nm, a zeta potential of -31.9 mV, an entrapment efficiency of 82.35%, and an in vitro drug release of 60.69%. These nanoparticles were then tested on lung cancer cell lines to assess their cytotoxicity, apoptosis induction, and anti-proliferative effects on the cell cycle. In vitro studies confirmed that the Crizotinib-loaded nanoparticles exerted targeted effects on non-small cell lung carcinoma (NSCLC) cell lines, showing maximum inhibitory effects. One year of storage at 4°C, stability testing demonstrated that the lyophilized nanoparticles maintained their effectiveness.

crizotinib nano-formulations were assessed for a variety of physicochemical and in vitro characterization. Five different formulations were designed and optimized on the basis of Particle size, Zeta potential, %EE, and in vitro drug release. Optimum formulation also showed maximum inhibitory effect on the cancer cell line.

This nanotechnology approach offers a promising targeted drug delivery system for Crizotinib, characterized by small particle size, high encapsulation efficiency (EE), and optimal in vitro drug release.

Cholesterol is considered a major factor contributing to cardiovascular diseases. Statins, the most commonly prescribed cholesterol-lowering drugs, are known to have various limitations. Inhibition of Adenosine Triphosphate-Citrate Lyase (ACLY) has been proposed as an alternative therapeutic strategy for managing hypercholesterolemia by lowering cholesterol levels. This has led to the discovery of a cell-permeable small molecule ACLY inhibitor.

ACLY enzyme activity was assessed using an ACLY Assay Kit with the ADP-Glo Kinase Assay Kit. HepG2 cells were treated with test compounds to demonstrate cholesterol and fatty acid synthesis. Pharmacokinetic studies were performed on CD-1 mice following a single oral dose of the compounds. Hypercholesterolemia was induced in mice through a High-Fat and High Cholesterol Diet (HFHCD), and drugs were administered orally for six weeks. Serum and hepatic lipid profiles were subsequently analyzed.

To increase the pharmacochemical properties, four analogues of BMS-303141, ID0018, ID0023, ID0085, and ID0106, were designed and synthesized. These compounds showed superior ACLY inhibitory activity and dose-dependent suppression of cholesterol and fatty acid synthesis in HepG2 cells. Among the analogues, ID0085 exhibited the most potent ACLY inhibition (IC50: 45 nM, 10-fold lower than BMS-303141) and achieved near-complete suppression in cholesterol and fatty acid synthesis at the highest concentration. Pharmacokinetic studies revealed improved half-lives and systemic exposures for all analogues. 
In hypercholesterolemic mouse models, test compounds significantly reduced serum total cholesterol 
(32.0-57.3%) and low-density lipoprotein cholesterol (67.5-80.2%) levels compared to the vehicle group. Notably, ID0085 also increased high-density lipoprotein cholesterol levels.

Among the synthesized analogues, ID0085 exhibited the most potent ACLY inhibition, superior pharmacokinetic properties, and significant improvements in both serum and hepatic cholesterol profiles compared to BMS-303141.

Based on the results, ID0085 appears to be the most promising therapeutic candidate for the treatment of hypercholesterolemia.

The combination of Astragalus membranaceus and Safflower (AS) is known for its efficacy in benefiting Qi and activating blood circulation, making it a frequently used empirical combination in traditional Chinese medicine. Numerous reports have highlighted the interventional effect of this combination in treating ischemic stroke (IS). However, the active ingredients and potential mechanisms underlying its treatment of stroke have not been fully elucidated.

Ultra-performance liquid chromatography quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF/MS), along with various data processing methods, were utilized to identify and assess the chemical constituents in rat serum following AS gavage administration. Chemical constituent targets were predicted using the SEA and Swiss Target Prediction databases, while IS-related targets were sourced from the GeneCards, OMIM, and TTD databases. The intersecting targets of constituents and diseases were screened, and a core target network map was constructed using the String database and Cytoscape software. KEGG pathway enrichment of core targets was analyzed using DAVID and Metascape databases. The middle cerebral artery occlusion (MCAO) rat model was established to evaluate the cerebroprotective effects of AS. The accuracy of predicted pathways was validated using immunofluorescence (IF) and Western blot (WB) analyses.

Thirty-five ingredients in serum were identified, and 437 targets and 3748 IS-related targets were identified, 291 of which overlapped. Protein-protein interaction (PPI) analysis predicted 15 major targets, including TNF and MAPK3. KEGG pathway analysis indicated that the MAPK/NF-κB and VEGF/Notch1 signaling pathways may play pivotal roles in the therapeutic effects of AS in IS. Moreover, AS significantly ameliorated neurological and motor function impairments, as well as brain histopathological damage, in MCAO rats. AS treatment led to reduced levels of the inflammatory cytokines IL-6 and TNF-α, inhibited astrocyte hyperactivation, decreased nuclear translocation of NF-κB p65, reduced expression of p-MAPK (Erk1/2)/ MAPK (Erk1/2) and p-NF-κB (p65)/NF-κB (p65) proteins, increased the number of CD31⁺/Ki67⁺ and VEGF⁺/ Ki67⁺-positive vessels, and upregulated the expression of VEGF, VEGFR-2, Notch1, and DLL4 proteins.

AS may regulate MAPK/NF-κB and VEGF/Notch1 pathways to reduce inflammation and promote post-ischemic neovascularization, providing a promising method for the treatment of ischemic stroke.

The progressive neurodegenerative disease known as Alzheimer's disease (AD) is typified by neuroinflammation, amyloid-beta buildup, and cognitive impairment. Current pharmacological treatments merely alleviate symptoms, despite extensive research, which underscores the need for innovative, multi-target medicines. Since apolipoprotein E4 (ApoE4) is a significant genetic risk factor linked to the development of AD, it is a potentially effective treatment target. With their neuroprotective qualities, natural substances like Ginkgolide may help treat some diseases. This study investigates Ginkgolide's potential as a multi-target treatment for AD, with a particular emphasis on how it interacts with the ApoE4 N-terminal domain.

The interaction between Ginkgolide and ApoE4 (PDB ID: 8AX8) was assessed using pharmacokinetic profiling, molecular docking, and molecular dynamics (MD) simulations. MD simulations were used to determine stability, and AutoDock Vina was used to obtain the binding affinity. To predict pharmacokinetics and toxicity, SwissADME and PkCSM were employed. The effectiveness of ginkgolide was contextualized using comparative docking with curcumin and resveratrol.

Ginkgolide formed sustained hydrophobic contacts with important sites and demonstrated a substantial binding affinity (-7.1 kcal/mol) to ApoE4. MD simulations verified negligible fluctuations and complex stability over 100 ns. Pharmacokinetics showed no significant toxicity risks, good gastrointestinal absorption, and favorable blood-brain barrier permeability. In terms of binding affinity and stability, ginkgolide fared better than curcumin and resveratrol, indicating its greater therapeutic potential.

The results indicate that ginkgolide effectively binds and stabilizes the ApoE4 N-terminal domain, supporting its potential role in modulating a key pathological factor in Alzheimer’s disease. Its superior pharmacokinetic profile and interaction dynamics compared to curcumin and resveratrol suggest a broader therapeutic relevance. These in silico insights provide a mechanistic basis for further investigation into ginkgolide’s neuroprotective effects.

The results demonstrated ginkgolide as a potentially effective multi-target treatment for AD through ApoE4 regulation. It is a better option than other natural chemicals because of its potent binding affinity, stability, and pharmacokinetics. These findings highlight the value of in silico methods in the early stages of drug discovery and the need for additional experimental support before they can be used in clinical settings.

The marine ecosystem, known for its diverse biochemistry and organisms adapted to harsh environments, contains numerous plants with promising anticancer potential. Halodule uninervis, a seagrass, contains a variety of bioactive compounds that provide various pharmacological properties. However, its potential anticancer effects against breast cancer remain largely unexplored.

HRLC-MS analysis was conducted to identify the phytochemicals in the ethanolic extract of H. uninervis leaves. Several publicly available databases, including SEA, STP, MALACARDS, DISGENET, and OMIM, were used to identify target genes. Protein-protein interaction (PPI) networks, gene ontology, and pathway analysis were carried out through the STRING and DAVID databases. Molecular docking was performed by Autodock Vina, while molecular dynamics (MD) simulations and MMPBSA analyses were conducted using GROMACS, demonstrating the stability of the complexes up to 200 ns.

The top five therapeutically active phytochemicals were Quercetin, Arborinine, Methyl 3,4,5-trimethoxycinnamate, Citreorosein, and Scopolin. The five hub genes, AKT1, EGFR, TNF, ESR1, and GAPDH, were found by network analyses. Molecular docking and MD simulation demonstrate that Quercetin and Citreorosein are the best phytochemicals exhibiting the highest affinities to breast cancer targets AKT1, EGFR, and ESR1.

For the first time, this in-silico study investigates the potential of citreorosein and quercetin, two phytochemicals predominantly found in H. uninervis leaves, to inhibit the activity of AKT1, EGFR, and ESR1. However, as these results are based on predictive computational analyses, further experimental validation is necessary to confirm their precise mechanisms of action.

Phytochemicals, namely Quercetin and Citreorosein, may have an impact on the progression of breast cancer by binding to the key targets AKT1, ESR1, and EGFR.

Genetic factors play a significant role in the development of leukemia. The overexpression of MDM2 is associated with the progression of certain leukemias. This meta-analysis investigates the relationship between the MDM2 SNP 309T>G and various forms of leukemia across global populations.

A comprehensive literature search was conducted to retrieve genotyping data from twenty case-control studies related to MDM2 SNP 309T>G polymorphism and leukemia. A random-effects model was used to calculate the pooled odds ratio (OR) and 95% confidence interval (95% CI) for the association analysis. MetaGenyo software was utilized to conduct statistical analyses in this meta-analysis.

The findings indicate a significant association between MDM2 309 SNPT>G polymorphism and leukemia in Asian and Caucasian populations. Additionally, this polymorphism is associated with an increased risk of Acute Myeloid Leukemia (AML) and Chronic Myeloid Leukemia (CML), implying that MDM2 may play a role in the pathogenesis of these specific forms of leukemia.

This meta-analysis suggests that MDM2 may represent a susceptibility gene for leukemia risk.

Glioblastoma Multiforme (GBM) is a highly aggressive and fatal brain malignancy, with Temozolomide (TMZ) serving as the first-line chemotherapeutic treatment. However, over 50% of patients do not respond to TMZ, and the underlying mechanisms remain unclear. This study utilized the GeCKO library to identify novel genes involved in TMZ resistance and to explore their functions.

Loss-of-function genes related to TMZ resistance in GBM cells were identified using the GeCKO library and Next-Generation Sequencing (NGS), validated by qPCR and CCK-8 assays. CD99L2 function was assessed through proliferation, migration, and EdU assays in U251 and U87 cells. Tumor samples from 55 stage IV GBM patients were analyzed to explore the correlation between CD99L2 expression and Progression-Free Survival (PFS).

GeCKO library screening identified seven genes associated with TMZ resistance. After validation, CD99L2 was confirmed as a key contributor to TMZ resistance. Knockdown of CD99L2 increased the IC50 of U251 and U87 cells by 1.39- and 1.54-fold, respectively. Conversely, CD99L2 overexpression reduced the IC50 by 0.52- and 0.58-fold. CD99L2 knockdown also promoted tumor proliferation and aggressiveness. Additionally, higher CD99L2 expression was associated with longer PFS in GBM patients (median PFS: 7.87 months vs. 2.7 months, P=0.0003).

The functions of CD99L2 remain poorly understood. A few studies have reported that CD99L2 may serve as an adhesion molecule modulating inflammatory responses. One study has shown that CD99L2 is highly expressed in the brain and affects neuronal excitability. These findings suggest that CD99L2 may play a positive role in the body’s defense against glioma.

This study demonstrated that CD99L2 knockdown promotes TMZ resistance and tumorigenesis in GBM, suggesting its potential as a novel biomarker for TMZ resistance.