Ciguatera fish poisoning (CFP) is a foodborne illness affecting > 50,000 people worldwide annually. It is caused by eating marine invertebrates and fish that have accumulated ciguatoxins (CTXs). Recently, the risk of CFP to human health, the local economy, and fishery resources have increased; therefore, detection methods are urgently needed. Functional assays for detecting ciguatoxins in fish include receptor binding (RBA) and neuroblastoma cell-based assay (N2a assay), which can detect all CTX congeners. In this study, we made these assays easier to use. For RBA, an assay was developed using a novel near-infrared fluorescent ligand, PREX710-BTX, to save valuable CTXs. In the N2a assay, a 1-day assay was developed with the same detection performance as the conventional 2-day assay. Additionally, in these assays, we used calibrated CTX standards from the Pacific determined by quantitative NMR for the first time to compare the relative potency of congeners, which differed significantly among previous studies. In the RBA, there was almost no difference in the binding affinity among congeners, showing that the differences in side chains, stereochemistry, and backbone structure of CTXs did not affect the binding affinity. However, this result did not correlate with the toxic equivalency factors (TEFs) based on acute toxicity in mice. In contrast, the N2a assay showed a good correlation with TEFs based on acute toxicity in mice, except for CTX3C. These findings, obtained with calibrated toxin standards, provide important insights into evaluating the total toxicity of CTXs using functional assays.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1016/j.toxicon.2023.107161 | DOI Listing |
ACS Omega
December 2024
School of Earth Resources, China University of Geosience, Wuhan 430074, P. R. China.
J Biol Chem
December 2024
Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, K7L 3N6, Canada. Electronic address:
Calpain-3 is an intracellular Ca-dependent cysteine protease abundant in skeletal muscle. Loss-of-function mutations in its single-copy gene cause a dystrophy of the limb-girdle muscles. These mutations, of which there are over 500 in humans, are spread all along this 94-kDa multi-domain protein that includes three 40+-residue sequences (NS, IS1, and IS2).
View Article and Find Full Text PDFZhongguo Zhong Yao Za Zhi
September 2024
Engineering Research Center, Ministry of Education, Hubei University of Chinese Medicine Wuhan 430065, China Hubei Shizhen Labortary Wuhan 430065, China.
J Clin Med
November 2024
Department of Odontostomatological and Maxillofacial Sciences, La Sapienza University of Rome, 00185 Rome, Italy.
: Oral cavity squamous-cell carcinoma is among the most frequent head and neck neoplasms. Early-stage T1/T2N0 accounts for 40/45% of new diagnoses. Of these, about 30% of cases hide occult metastases in the neck.
View Article and Find Full Text PDFInt J Mol Sci
December 2024
Department of Nutrition, China Medical University, No. 100, Sec. 1, Jingmao Rd., Beitun Dist., Taichung City 40604, Taiwan.
Alzheimer's disease (AD), a leading neurodegenerative disorder, is closely associated with the accumulation of amyloid-beta (Aβ) peptides in the brain. The enzyme β-secretase (BACE1), pivotal in Aβ production, represents a promising therapeutic target for AD. While bioactive peptides derived from food protein hydrolysates have neuroprotective properties, their inhibitory effects on BACE1 remain largely unexplored.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!