Date of Award

1-1963

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Medical

First Advisor

Howard M. Klitgaard

Second Advisor

Alvin F. Rieck

Third Advisor

William J. Stekiel

Abstract

Malic dehydrogenase (MDH) capacity in rat heart tissue homogenates and mitochondrial suspensions shows a 75% reduction when 4.5 x 10-5 M thyroxine is added in vitro (1). Thyroxine was found to inhibit other DPN-linked dehydrogenases in vitro, namely, glutamic, lactic, triosphosphate, yeast alcohol, and yeast glucose-6-phosphate dehydrogenases (2). The present study involves an evaluation of the changes of MDH activity in vivo with time due to thyroxine lack after thyroidectomy. In addition, the correlation of enzyme changes with the decline in tissue oxygen · consumption during similar time periods after surgical removal of the thyroid gland was performed.

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