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Tăng phosphoryl hóa protein trung gian đáp ứng collapsin-2 tại Thr514 tương quan với gánh nặng β-amyloid và khiếm khuyết synap trong chứng mất trí Lewy
Tóm tắt
Protein trung gian đáp ứng collapsin-2 (CRMP2) điều chỉnh sự mở rộng của mũi nhọn trục thần kinh, và việc gia tăng phosphoryl hóa CRMP2 có thể dẫn đến thoái hóa trục thần kinh. Bệnh lý trục thần kinh và synap là một đặc điểm quan trọng của chứng mất trí thể Lewy (LBD), nhưng trạng thái phosphoryl hóa CRMP2 (pCRMP2) cũng như mối tương quan của nó với các chỉ dấu thoái hóa thần kinh vẫn chưa được nghiên cứu trong các chứng mất trí này. Do đó, chúng tôi đã đo phosphoryl hóa CRMP2 tại Thr509, Thr514 và Ser522, cũng như các chỉ dấu của β-amyloid (Aβ), phosphoryl hóa tau, α-synuclein và chức năng synap trong vỏ não sau khi tử vong của một nhóm bệnh nhân LBD được đánh giá theo dõi có đặc trưng bởi gánh nặng bệnh lý kiểu Alzheimer thấp (mất trí do bệnh Parkinson, PDD) và cao (mất trí thể Lewy, DLB). Chúng tôi phát hiện ra sự tăng cụ thể của pCRMP2 tại Thr514 ở DLB, nhưng không phải ở PDD. Sự gia tăng phosphoryl hóa CRMP2 tương quan với Aβ tạo sợi cũng như với sự mất mát của các chỉ dấu cho sự tái sinh trục thần kinh (β-III-tubulin) và tính toàn vẹn synap (synaptophysin) trong LBD. Ngược lại, sự biến đổi pCRMP2 không tương quan với phosphoryl hóa tau hoặc α-synuclein, và dường như cũng không liên quan đến các hoạt động miễn dịch của các kinase thượng nguồn được cho là glycogen synthase kinase 3β và cyclin-dependent kinase 5, cũng như protein phosphatase 2A. Tóm lại, tăng pCRMP2 có thể là nguyên nhân của bệnh lý trục thần kinh ở DLB, và có thể là một mục tiêu điều trị mới. Tuy nhiên, các sự kiện tín hiệu trước đó cũng như bản chất của sự liên kết pCRMP2 với Aβ và các chỉ dấu bệnh lý thần kinh khác cần được nghiên cứu thêm.
Từ khóa
#CRMP2 #phosphoryl hóa #chứng mất trí thể Lewy #β-amyloid #bệnh lý trục thần kinhTài liệu tham khảo
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