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Primary Cultures of Rabbit Renal Proximal Tubule Cells: I. Growth and Biochemical Characteristics

Michael D. Aleo, Mary L. Taub, Peter A. Nickerson and Paul J. Kostyniak
In Vitro Cellular & Developmental Biology
Vol. 25, No. 9 (Sep., 1989), pp. 776-783
Stable URL: http://www.jstor.org/stable/20171506
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Primary Cultures of Rabbit Renal Proximal Tubule Cells: I. Growth and Biochemical Characteristics
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Abstract

Before the usefulness of a new in vitro model can be ascertained, the model must be properly defined and characterized. This study presents the growth rate and biochemical characteristics of rabbit renal proximal tubule cells in primary culture over a 2-wk culture period. When grown in a hormonally defined, antibiotic-free medium these cells form confluent monolayer cultures within 7 d after plating. Multicellular dome formation, an indicator of transepithelial solute transport, was expressed after confluent cultures were formed. The activity of the cytosolic enzyme, lactate dehydrogenase, and the lysosomal enzyme, N-acetyl-glucosaminidase, increased 14- and 2-fold during the first 8 d of culture, respectively. In contrast, the activity of a brush border enzyme, alkaline phosphatase, decreased 85% within the first 8 d of culture. Release of these enzyme markers into the culture medium, which are routinely used to measure cytotoxicity, stabilized after 8 d in culture. The ratio of cellular protein to DNA changed according to the state of cellular growth. Values rose from 0.035 mg protein/μg DNA in preconfluent cultures to 0.059 mg protein/μg DNA in confluent cultures. These results document the characteristics of a primary proximal tubule cell culture system for future studies in in vitro toxicology.

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