Subcellular localization of recently-absorbed iron in mouse duodenal enterocytes: identification of a basolateral membrane iron-binding site.

Abstract:

:The subcellular distribution of newly absorbed iron in isolated mouse duodenal enterocytes was investigated by analytical subcellular fractionation using sucrose density gradient centifugation. Two major peaks of mucosal 59Fe activity were observed: one soluble and one particulate (density 1.18-1.20 g ml-1). The latter was increased following prior exposure of animals to chronic hypoxia. The particulate 59Fe was localized to the basolateral membranes using the marker enzyme Na+, K+ activated, Mg2+ dependent, ATPase and by washing intact enterocytes with the selective plasma membrane perturbant digitonin. The basolateral membrane can be selectively labelled by in vitro incubation of intact enterocytes at 0 degrees C with 59Fe(III)-nitrilotriacetate complex, confirming the presence of a 59Fe binding site on this membrane. No significant difference in in vitro iron binding to this site was observed between normal and chronically hypoxic animals. Iron binding to the basolateral membrane was significantly higher in disrupted, compared to intact enterocytes, indicating that this site is present on both sides of the basolateral membrane. It is therefore suggested that the increased labelling of this site in hypoxia, in vivo, is a consequence of an increase in a mucosal Fe pool which is available for binding to a membrane receptor.

journal_name

Cell Biochem Funct

authors

Snape S,Simpson RJ,Peters TJ

doi

10.1002/cbf.290080205

subject

Has Abstract

pub_date

1990-04-01 00:00:00

pages

107-15

issue

2

eissn

0263-6484

issn

1099-0844

journal_volume

8

pub_type

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