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Na,K-ATPase expression in the developing brine shrimp Artemia. Immunochemical localization of the alpha- and beta-subunits

DY Sun, JZ Guo, HA Hartmann, H Uno and LE Hokin

Department of Pathology and Laboratory Medicine, University of Wisconsin, Madison 53706.

Developing brine shrimp are a good experimental model for study of gene expression during development. Development is initiated on suspension of brine shrimp cysts in seawater. Only 48 hr are required for progression from cyst to the larval stage. We have localize the alpha- and beta-subunits in different cells by immunostaining as development progresses. Both alpha- and beta-subunits are first detected in epidermal cells in the trunk region at the emergence 2 stage (16-hr incubation). At the nauplius 1 stage (24 hr) the enzyme appears in the brain and epidermal regions, as well as in mesenchymal cells, with weaker staining in the salt gland. After further development (nauplius 2 stage, 36 hr) stronger staining appears in the salt gland and in the epidermal region. At the nauplius 3 stage (48 hr) the enzyme appears in the midgut mucosa. Co-localization of the alpha- and beta-subunits appears in all positive cells during development. In the epidermal and salt gland cells the enzyme is mainly localized on the basolateral membrane. The basolateral localization of the Na,K-ATPase in epidermal and salt gland cells suggests that Na+ is actively transported into the epidermal and salt gland cells and passively diffuses out from the apical region.

Volume 39, Issue 11, pp. 1455-1460, 11/01/1991
Copyright © 1991 by The Histochemical Society


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