Background: Tecoma stans (L.) Juss. ex Kunth is a well-known medicinal plant found in tropical and subtropical regions. It contains a broad range of bioactive compounds that exhibit many biological effects, including antidiabetic, antibacterial, and antioxidative activities. However, the effect of natural peptides from T. stans against cancer progression and free radical production is unknown. This study aims to evaluate the cytotoxic, anti-metastatic, and antioxidative activities of natural peptides from T. stans on A549 cells. Methods: The natural peptides were extracted from the flower of T. stans using the pressurized hot water extraction (PHWE) method, followed by size exclusion chromatography and solid-phase extraction-C18. The cytotoxic and anti-metastatic effects of natural peptides were evaluated using MTT and transwell chamber assays, respectively. The free radical scavenging activity of natural peptides was determined using ABTS, DPPH, and FRAP assays. The cells were pretreated with the IC₅₀ dosage of natural peptides and stimulated with LPS before analyzing intracellular reactive oxygen species (ROS) and proteomics. Results: Natural peptides induced cell toxicity at a concentration of less than 1 ng/ml and markedly reduced cell motility of A549 cells. The cells had a migration rate of less than 10% and lost their invasion ability in the treatment condition. In addition, natural peptides showed free radical scavenging activity similar to standard antioxidants and significantly decreased intracellular ROS in the LPS-induced cells. Proteomic analysis revealed 1,604 differentially expressed proteins. The self-organizing tree algorithm (SOTA) clustered the protein abundances into eleven groups. The volcano plot revealed that the cancer-promoting proteins (NCBP2, AMD, MER34, ENC1, and COA4) were down-regulated, while the secretory glycoprotein (A1BG) and ROS-reducing protein (ASB6) were up-regulated in the treatment group. Conclusion: The anti-proliferative and anti-metastatic activities of natural peptides may be attributed to the suppression of several cancer-promoting proteins. In contrast, their antioxidative activity may result from the up-regulation of ROS-reducing protein. This finding suggests that natural peptides from T. stans are viable for being the new potential anti-cancer and antioxidative agents.

Background and Aim: Keratitis is a serious ocular infection often caused by pathogenic micro-organisms such as Acanthamoeba spp. Among other harmful microbes, Acanthamoeba keratitis presents a particular challenge due to its resistance to conventional antimicrobial agents. Piper betle Linn., commonly known as betel leaf, has been traditionally used for its medicinal properties. This study aimed to assess the potential of the leaf ethanol extract of P. betle Linn. in the treatment of Acanthamoeba triangularis in monoculture and co-culture with two prevalent pathogenic bacteria, Staphylococcus aureus and Pseudomonas aeruginosa, associated with keratitis. Materials and Methods: Minimum inhibitory concentrations (MICs) of A. triangularis, S. aureus, and P. aeruginosa extracts in monoculture and coinfected conditions were examined. In addition, this study explored the potential of the extract in preventing Acanthamoeba adherence in both monoculture and co-culture environments. Scanning electron microscopy (SEM) analysis confirmed the impact of the extract on Acanthamoeba cell membranes, including acanthopodia. Furthermore, a time-kill kinetic assay was used to validate the amoebicidal activity of the extract against A. triangularis and the tested bacteria. Results: MICs for trophozoites, cysts, P. aeruginosa, and S. aureus in the monoculture were 0.25, 0.25, 0.51, and 0.128 mg/mL, respectively, whereas the MICs for Acanthamoeba coinfected with bacteria were higher than those in the monoculture. This extract inhibited the growth of A. triangularis trophozoites and cysts for up to 72 h. Moreover, P. betle extract effectively prevented the adherence of Acanthamoeba to contact lenses under monoculture conditions. SEM analysis confirmed that P. betle extract affects the cell membrane of Acanthamoeba, including Acanthopodia. In addition, the time-kill kinetic assay confirmed that the extract contained amoebicidal activity against A. triangularis, including the tested bacteria. Notably, S. aureus was more susceptible than A. triangularis and P. aeruginosa to P. betle extract treatment. Unexpectedly, our study revealed that S. aureus negatively affected A. triangularis in the co-culture after 3 days of incubation, whereas P. aeruginosa facilitated the growth of A. triangularis in the presence of the extract. Conclusion: This study provides compelling evidence of the anti-adhesive and anti-Acanthamoeba properties of P. betle leaf extract against A. triangularis under monoculture and co-culture conditions. The observed impact on Acanthamoeba cell membranes, coupled with the time-kill kinetic assay results, underscores the potential of P. betle leaf extract as a promising agent for combating Acanthamoeba-related infections in humans and animals. Keywords: Piper betle extract, Acanthamoeba triangularis, co-infection, keratitis, Pseudomonas aeruginosa, Staphylococcus aureus.

Background: Alloantibodies are immune responses produced by exposure to foreign red blood cell antigens. However, sensitized alloantibodies can lead to hemolytic transfusion reactions and complicate cross-matching procedures. Objectives: This review article aims to demonstrate the prevalence of unexpected alloantibodies across Thailand’s four major geographical regions. Materials and methods: A comprehensive literature search was conducted across PubMed, Google Scholar, and ThaiJo databases using keywords related to unexpected alloantibodies in Thailand, yielding 17 articles categorized by geographical region. Studies were filtered using strict criteria (published 2013-2025, sample size > 100, reporting > 2 alloantibody types) for final data analysis. Results: It is revealed that anti-Mia is the highest unexpected alloantibody, with a prevalence rate of 25.9-37.2% across all four regions, followed by anti-E (15.6-20.7%), anti-Lea (4.7-14.6%), and anti-Leb (4.6-8.0%), respectively. Interestingly, anti-P1 is remarkably increased in the Northern region (15.1%), whereas anti-Jka (4.7%) and anti-Jkb (2.5%) are specifically higher in the Northeastern region. Conclusion: This review highlights the importance of practicing antibody screening protocols, choosing compatible antigen status, and establishing rare donor registries in Thailand to avoid unexpected alloimmunization, thereby ensuring optimal transfusion safety.

Diabetes mellitus, a condition characterized by hyperglycemia, poses significant global health concern. Despite the availability of several antidiabetic drugs, the search for new therapeutic agents with fewer side effects and better efficacy continues. Phanera strychnifolia (Craib) K. W. Jiang, S. R. Gu, & T. Y. Tu, a medicinal plant traditionally used in Southeast Asia, has gained attention for its bioactive components. Two major compounds isolated, namely, 3,5,7‐trihydroxychromone‐3‐O‐α‐L‐rhamnopyranoside and 3,5,7,3′,5′‐pentahydroxy‐flavanonol‐3‐O‐α‐L‐rhamnopyranoside, have shown promise as antihyperglycemic agents in human intestinal epithelial Caco‐2 cells. It had been demonstrating antidiabetic and antioxidant activities of its aqueous extract in both in vivo and in vitro studies with limited information regarding their antihyperglycemic effect on insulin secretion and glucose transporter expression. Therefore, this study aims to evaluate the impact of P. strychnifolia extracts on blood glucose levels in diabetic rats and to investigate the expression of glucose transporter proteins (GLUT2 and GLUT4) and insulin production in relevant tissues to elucidate the mechanisms of improved glucose uptake and utilization. The antidiabetic effect of P. strychnifolia was determined by histological staining and immunocytochemical localization of insulin, GLUT2, and GLUT4 in pancreatic islets and the heart. Additionally, toxicity assessment was conducted over a 63‐day administration by observing biochemical parameters and histological changes. P. strychnifolia demonstrates nontoxic characteristics, as evidenced by the absence of mortality and clinical toxicity signs at the 400 mg/kg dose after 63 days of treatment. In diabetic rats, administration of 100 and 200 mg/kg of P. strychnifolia for 14 days significantly reduced blood glucose levels by approximately 45.65% and 41.01%, respectively, compared to the diabetic control group. Both doses effectively reduced lipid droplets in the liver, indicating decreased tissue injury. P. strychnifolia demonstrates significant antihyperglycemic activity and beneficial effects on insulin and glucose transporter protein expression in diabetic rats, with no observed toxicity. These findings suggest its potential as a therapeutic agent for diabetes management.