Influence of glycosylation inhibitors on dihydropyridine binding to cardiac cells

  • Ursula Henning
  • Gerd Wallukat
  • Martin Holtzhauer
Part of the Developments in Molecular and Cellular Biochemistry book series (DMCB, volume 18)


In primary cultures of neonatal rat heart cells we found a linear correlation between the number of L-type calcium channel-specific dihydropyridine (DHP) binding sites and spontaneous beating frequency (v).

Formation of glycoproteins in tissue culture was suppressed by different inhibitors of N-glycosylation. This inhibition alters to a different extent the binding of the DHP ligand (+)-[methyl-3H]PN 200-110 and v. The most severe but reversible effect occurs at 6 µ/ml tunicamycin (Bmax ≈ 45% and v ≈ 6%, resp., of control), a slight increase in Bmax at 0.1–0.5 mM castanospermine and 0.05–2.5 mM deoxymannojirimycin. The other inhibitors gave no significant alterations of Bmax. (Mol Cell Biochem 160/161:45–52, 1996)

Key words

calcium channel glycosylation inhibitor cultured cardiac cells dihydropyridine receptors glycoproteins 


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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Ursula Henning
    • 1
  • Gerd Wallukat
    • 2
  • Martin Holtzhauer
    • 1
  1. 1.Institute of Biochemistry and Molecular PhysiologyUniversity of PotsdamBerlinGermany
  2. 2.Department of Molecular CardiologyMax Delbrück Center for Molecular MedicineBerlinGermany

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