Abstract
Evidence is presented that unique high molecular weight glycoproteins of human milk fat globules may be involved in milk fat absorption by the infant. Milk fat globules from a number of species were evaluated for surface structure by freeze-etch and thin-section electron microscopy, and for glycoprotein composition by SDS-gel electrophoresis. Globules of the human, but not of cow, goat, sheep and rat, showed a filamentous surface coat. These filaments could be removed from the globule by heating (80°C-10 min), and were identified by gel electrophoresis as 3 high molecular weight glycoproteins of the globule membrane. This group of proteins was missing from globules of the other species. Several studies (eg. Atkinson et al. J. Pediatr. 99:617, 1981) show that heating milk lowers absorption of its fat in the preterm infant. We suggest that heat destruction of bilesalt-stimulated lipase may not be the explanation of this phenomenon since fat in an infant formula containing no lipase was well absorbed (Shenai et al. Pediatrics 66:233, 1980). Heat-induced changes in the globule surface, such as loss of high molecular weight glycoproteins, affords an alternative or additional explanation.
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© 1987 Springer Science+Business Media New York
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Patton, S., Buchheim, W., Welsch, U. (1987). Glycoproteins of the Human Milk Fat Globule Membrane: Ultrastructure and Relation to Fat Absorption. In: Goldman, A.S., Atkinson, S.A., Hanson, L.Å. (eds) Human Lactation 3. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0837-7_43
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DOI: https://doi.org/10.1007/978-1-4899-0837-7_43
Publisher Name: Springer, Boston, MA
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