Molecules 2013, 18(3), 2571-2586; doi:10.3390/molecules18032571
Article

Artificial and Natural Sialic Acid Precursors Influence the Angiogenic Capacity of Human Umbilical Vein Endothelial Cells

1,†email, 1,†email, 1email, 2email, 1email, 3email, 1email, 1email, 1email and 1,* email
Received: 9 October 2012; in revised form: 6 February 2013 / Accepted: 19 February 2013 / Published: 26 February 2013
(This article belongs to the Special Issue Advances in Carbohydrate Chemistry)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: N-acetylneuraminic acid (Neu5Ac) represents the most common terminal carbohydrate residue in many mammalian glycoconjugates and is directly involved in a number of different physiological as well as pathological cellular processes. Endogenous sialic acids derive from the biosynthetic precursor molecule N-acetyl-D-mannosamine (ManNAc). Interestingly, N-acyl-analogues of D-mannosamine (ManN) can also be incorporated and converted into corresponding artificial sialic acids by eukaryotic cells. Within this study, we optimized a protocol for the chemical synthesis of various peracetylated ManN derivatives resulting in yields of approximately 100%. Correct molecular structures of the obtained products ManNAc, N-propanoyl-ManN (ManNProp) and N-butyl-ManN (ManNBut) were verified by GC-, ESI-MS- and NMR-analyses. By applying these substances to human umbilical vein endothelial cells (HUVECs), we could show that each derivative was metabolized to the corresponding N-acylneuraminic acid variant and subsequently incorporated into nascent glycoproteins. To investigate whether natural and/or artificial sialic acid precursors are able to modulate the angiogenic capacity of HUVECs, a spheroid assay was performed. By this means, an increase in total capillary length has been observed when cells incorporated N-butylneuraminic acid (Neu5But) into their glycoconjugates. In contrast, the natural precursor ManNAc inhibited the growth of capillaries. Thus, sialic acid precursors may represent useful agents to modulate blood vessel formation.
Keywords: glycoengineering; artificial sialic acids; mannosamine; angiogenesis
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MDPI and ACS Style

Bayer, N.B.; Schubert, U.; Sentürk, Z.; Rudloff, S.; Frank, S.; Hausmann, H.; Geyer, H.; Geyer, R.; Preissner, K.T.; Galuska, S.P. Artificial and Natural Sialic Acid Precursors Influence the Angiogenic Capacity of Human Umbilical Vein Endothelial Cells. Molecules 2013, 18, 2571-2586.

AMA Style

Bayer NB, Schubert U, Sentürk Z, Rudloff S, Frank S, Hausmann H, Geyer H, Geyer R, Preissner KT, Galuska SP. Artificial and Natural Sialic Acid Precursors Influence the Angiogenic Capacity of Human Umbilical Vein Endothelial Cells. Molecules. 2013; 18(3):2571-2586.

Chicago/Turabian Style

Bayer, Nils B.; Schubert, Uwe; Sentürk, Zehra; Rudloff, Silvia; Frank, Sandra; Hausmann, Heike; Geyer, Hildegard; Geyer, Rudolf; Preissner, Klaus T.; Galuska, Sebastian P. 2013. "Artificial and Natural Sialic Acid Precursors Influence the Angiogenic Capacity of Human Umbilical Vein Endothelial Cells." Molecules 18, no. 3: 2571-2586.

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