Kidney sulfatides in mouse models of inherited glycosphingolipid disorders: determination by nano-electrospray ionization tandem mass spectrometry

The Journal of Biological Chemistry
Roger SandhoffHermann-Josef Grone

Abstract

Sulfatides show structural, and possibly physiological similarities to gangliosides. Kidney dysfunction might be correlated with changes in sulfatides, the major acidic glycosphingolipids in this organ. To elucidate their in vivo metabolic pathway these compounds were analyzed in mice afflicted with inherited glycosphingolipid disorders. The mice under study lacked the genes encoding either beta-hexosaminidase alpha-subunit (Hexa-/-), the beta-hexosaminidase beta-subunit (Hexb-/-), both beta-hexosaminidase alpha and beta-subunits (Hexa-/- and Hexb-/-), GD3 synthase (GD3S-/-), GD3 synthase and GalNAc transferase (GD3S-/- and GalNAcT-/-), GM2 activator protein (Gm2a-/-), or arylsulfatase A (ASA-/-). Quantification of the sulfatides, I(3)SO(3)(-)-GalCer (SM4s), II(3)SO(3)(-)-LacCer (SM3), II(3)SO(3)(-)-Gg(3)Cer (SM2a), and IV(3,) II(3)-(SO(3)(-))(2)-Gg(4)Cer (SB1a), was performed by nano-electrospray tandem mass spectrometry. We conclude for the in vivo situation in mouse kidneys that: 1) a single enzyme (GalNAc transferase) is responsible for the synthesis of SM2a and GM2 from SM3 and GM3, respectively. 2) In analogy to GD1a, SB1a is degraded via SM2a. 3) SM2a is hydrolyzed to SM3 by beta-hexosaminidase S (Hex S) and Hex A, but n...Continue Reading

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