Communications medicine · 2025
N-glycan-modified α-L-iduronidase produced by transgenic silkworms ameliorates clinical signs in a Japanese macaque with mucopolysaccharidosis I.
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Shinoda Chika, Kitakaze Keisuke, Sasai Yuya, Nishioka So-Ichiro, Kobayashi Isao, Sumitani Megumi, Tatematsu Ken-Ichiro, Iizuka Tetsuya, Harazono Akira, Mitani Ai, Kaneko Akihisa, Imamura Masanori, Miyabe-Nishiwaki Takako, Go Yasuhiro, Hirata Akihiro, Takeuchi Yoshie, Mizuno Teru, Kiriyama Kei, Tsukimoto Jun, Nadanaka Satomi, Ishii-Watabe Akiko, Kinoshita Takashi, Kitagawa Hiroshi, Suzuki Yasuyuki, Oishi Takao, Sezutsu Hideki, Itoh Kohji
Аннотация
BACKGROUND: Mucopolysaccharidosis type I (MPS I) is an inherited lysosomal storage disorder (LSD) caused by recessive mutations in the α-L-iduronidase (IDUA) gene. Enzyme replacement therapy (ERT) utilizing terminal mannose-6-phosphate (M6P)-carrying N-glycans attached to therapeutic enzymes produced by mammalian cell lines has been clinically applied to several LSDs. Recent studies suggested an unidentified delivery pathway mediated by sialic acid-containing N-glycans. However, more economical platform development is required to produce large quantities of recombinant enzymes. Transgenic silkworms have been established as low-cost systems for expressing recombinant glycoproteins. Microbial endo-β-N-acetylglucosaminidases (ENGases) enable the transglycosylation of N-glycans to other types.
METHODS: We purified recombinant human IDUA from IDUA transgenic silkworm cocoons and performed ENGase-mediated transglycosylation. Furthermore, we performed intravenous enzyme replacement therapy in a Japanese macaque MPS I non-human primate model carrying a homozygous IDUA missense mutation.
RESULTS: Here we show the establishment of IDUA transgenic silkworms and purification of recombinant human IDUA from cocoons. As M6P- and sialic acid-containing N-glycans are not attached to purified hIDUA, we perform ENGase-mediated transglycosylation to obtain hIDUAs with M6P- and sialic acid-containing N-glycans (neoglyco-hIDUAs). Furthermore, we perform intravenous neoglyco-hIDUA replacement therapy in MPS I non-human primate model and succeed in improving the clinical signs and reducing the urinary glycosaminoglycan (GAG) levels.
CONCLUSIONS: These glycotechnologies using transgenic silkworms and ENGases are expected to serve as platforms for developing therapeutic glycoproteins.
METHODS: We purified recombinant human IDUA from IDUA transgenic silkworm cocoons and performed ENGase-mediated transglycosylation. Furthermore, we performed intravenous enzyme replacement therapy in a Japanese macaque MPS I non-human primate model carrying a homozygous IDUA missense mutation.
RESULTS: Here we show the establishment of IDUA transgenic silkworms and purification of recombinant human IDUA from cocoons. As M6P- and sialic acid-containing N-glycans are not attached to purified hIDUA, we perform ENGase-mediated transglycosylation to obtain hIDUAs with M6P- and sialic acid-containing N-glycans (neoglyco-hIDUAs). Furthermore, we perform intravenous neoglyco-hIDUA replacement therapy in MPS I non-human primate model and succeed in improving the clinical signs and reducing the urinary glycosaminoglycan (GAG) levels.
CONCLUSIONS: These glycotechnologies using transgenic silkworms and ENGases are expected to serve as platforms for developing therapeutic glycoproteins.