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Các tế bào gan chính từ chuột thiếu enzyme cysteine dioxygenase cho thấy nồng độ cysteine tăng và tỷ lệ chuyển hóa cysteine thành hydrogen sulfide và thiosulfate cao hơn
Tóm tắt
Sự oxi hóa cysteine trong các tế bào động vật có vú diễn ra qua hai con đường: con đường oxi hóa trực tiếp được điều chỉnh chặt chẽ, trong đó bước đầu tiên được xúc tác bởi enzyme cysteine dioxygenase (CDO), và con đường khử lưu huỳnh-oxi hóa, trong đó lưu huỳnh được giải phóng ở trạng thái oxi hóa đã được giảm. Để đánh giá tác động của việc thiếu CDO đối với sự sản xuất hydrogen sulfide (H2S) và thiosulfate (một chất trung gian trong quá trình oxi hóa H2S thành sulfate), cũng như để khám phá vai trò của cystathionine γ-lyase (CTH) và cystathionine β-synthase (CBS) trong quá trình khử lưu huỳnh cysteine bởi gan, chúng tôi đã nghiên cứu chuyển hóa cysteine trong các tế bào gan được tách ra từ chuột thiếu gen Cdo1 và chuột hoang dã. Các tế bào gan từ chuột thiếu Cdo1 sản xuất nhiều H2S và thiosulfate hơn so với các tế bào gan từ chuột hoang dã. Lưu lượng cysteine lớn hơn thông qua các phản ứng khử lưu huỳnh cysteine được xúc tác bởi CTH và CBS trong các tế bào gan từ chuột thiếu Cdo1 dường như là hậu quả của mức cysteine cao hơn, mà nguyên nhân là do sự thiếu hụt CDO và do đó là sự thiếu hụt chuyển hóa cysteine qua các con đường phụ thuộc cysteinesulfinate. Cả CBS và CTH đều có vẻ góp phần đáng kể vào quá trình khử lưu huỳnh cysteine, với ước tính 56 % do CBS và 44 % do CTH trong các tế bào gan từ chuột hoang dã, và 63 % do CBS và 37 % do CTH trong các tế bào gan từ chuột thiếu Cdo1.
Từ khóa
#cysteine; cysteine dioxygenase; hydrogen sulfide; thiosulfate; cystathionine γ-lyase; cystathionine β-synthase; tế bào ganTài liệu tham khảo
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