Supplemental Analysis for N-linked Sugars in Adult Pig Islets.
The pig pancreas is considered to be one of the most suitable sources of islets for clinical xenotransplantation. However, after producing α1-3galactosyltransferase knockout pigs, most of the organs of these pigs showed less antigenicity to the human body. Wild-type adult pig islets (APIs) that originally produced negligible levels of α-Gal, different from neonatal porcine islet-like cell clusters, showed a clear antigenicity to human serum. Concerning the so-called non-Gal epitopes, many studies related to glycoproteins and glycolipids are ongoing in efforts to identify them. However, our knowledge of non-Gal glycoantigens remains incomplete. In our previous study, N-glycans were isolated from APIs, and the structures of 28 of the N-glycans were detected. In this study, to identify additional structures, further analyses were performed by liquid chromatography-mass spectrometry (LC-MS). N-glycans were isolated from APIs by the method described by O'Neil et al with minor modifications and LC-MS-based structural analyses were then performed. The detected N-glycan peaks in the LC-MS spectra were selected using the FLexAnalysis software program and the structures of the glycans were predicted using the GlyocoMod Tool. The API preparation contained 11 peaks and 16 structures were then nominated as containing N-linked sugars. Among them, 5 sulfated glycans were estimated, confirming the existence of sulfate structures in N-glycans in API. In addition, these data may supplement several N-glycan structures that contain two deoxyhexose units, such as fucose, to our previous report. The data herein will be helpful for future studies of antigenicity associated with API.
Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan. Electronic address: hiroshieguchi@hotmail.com.
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Eguchi
Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
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Kawamura
Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
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Kashiyama
Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
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Matsuura
Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
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Sakai
Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
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Nakahata
Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
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Lo
Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
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Asada
Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
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Maeda
International Advanced Research and Education Organization, Tohoku University, Miyagi, Japan.
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Goto
Research Department, Sumitomo Bakelite Co. Ltd, Japan.
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Toyoda
Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
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Okuyama
Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
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Miyagawa
D000818:Animals; D000939:Epitopes / Q000378:metabolism; D006023:Glycoproteins / Q000378:metabolism; D006801:Humans; D007515:Islets of Langerhans / Q000737:chemistry*; D013058:Mass Spectrometry; D011134:Polysaccharides / Q000378:metabolism*; D034421:Sus scrofa; D013552:Swine; D014183:Transplantation, Heterologous
D000939:Epitopes; D006023:Glycoproteins; D011134:Polysaccharides