老年痴呆症 z-bo 2020-12-18 329

　　After collecting tissue specimens of the fin and meat of 10 shark species from the Atlantic and Pacific Oceans, the researchers found that they contained two toxins-mercury and β-N-methylamino-L-alanine (BMAA). "Recent research has shown that BMAA is associated with neurodegenerative diseases such as Alzheimer's and amyotrophic lateral sclerosis (ALS)," said Deborah Mash, a professor of neurology and senior author of the study. Researchers from the University of Miami (UM) Rosenstiel School of Oceanic and Atmospheric Sciences and Miller School of Medicine investigated mercury and β-N-methylamino-L- in the fins and meat of all species of sharks that may pose a threat to human health. The concentration of alanine (BMAA) was tested. When mercury and β-N-methylamino-L-alanine (BMAA) exist independently, they pose a health threat to colleagues, and their co-existence may have synergistic toxic effects. "Since sharks are carnivores and live at higher levels in the food chain, their tissues tend to accumulate toxins, which not only poses a threat to the health of sharks, but also puts health risks on the weakness of complementary sharks," the study Said senior author Neil Hammerschlag, a research assistant professor from UM Abbes Ecosystem Science and Decision Center and UM Rosenstiel College.

　　 Shark food including shark fin, cartilage and meat is widely eaten as a delicacy in Asian and global Chinese communities, and it is also one of the sources of traditional Chinese medicine. In addition, dietary supplements containing shark cartilage are widely used worldwide.

　　 Recently, scientists have discovered that BMAA is contained in shark fin and shark cartilage supplements. The neurotoxic methylmercury is known to bioaccumulate during the long life course of sharks.

　　 "Our research results indicate that humans who eat some sharks may be at risk of neurological diseases." Mash said. "People should be aware of this and consider limiting the predation of sharks. Restricting predation of sharks will bring positive health benefits to humans and also have a positive effect on the protection of sharks. Part of the reason for the endangerment of sharks is the increasing consumption of shark fin soup. Demand, step back and say, demand for shark meat and cartilage products,” Hammerschlag said.