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Charles E. Holdsworth, PhD; Gerald L. Endahl, PhD; Nathaniel Soifer, MD; Keith E. Richardson, PhD; Edward J. Eyring, MD, PhD

Arch Otolaryngol. 1973;98(5):336-339.

Abstract
The concentration of protein and the activities of lactate dehydrogenase (LDH), phosphofructokinase (PFK), and phosphohydrolase are abnormally elevated in bone affected by osteogenesis imperfecta. In otosclerotic bone, only phosphohydrolase activity is abnormally high, while LDH activity is abnormally low. The PFK from otosclerotic bone is insensitive to negative feedback regulation by citrate. The PFK from bone affected by osteogenesis imperfecta responds normally to citrate control. Selective inhibition of LDH activity by oxalate indicates an increase in the heart-type isozyme in otosclerosis and the muscletype isozyme in osteogenesis imperfecta.

The biochemical data in this study indicate that the two diseases are enzymatically distinguishable. Therefore, it is unlikely that otosclerosis and osteogenesis imperfecta are determined by a common abnormal gene, as has been hypothesized elsewhere.

Author Affiliations
Columbus, Ohio; Los Angeles; Dayton, Ohio; Columbus, Ohio

From the Department of Physiological Chemistry, the Ohio State University, Columbus, Ohio (Drs. Holdsworth, Richardson, and Eyring), the University of Southern California, Los Angeles (Dr. Endahl); and the Good Samaritan Hospital, Dayton, Ohio (Dr. Soifer).

Footnotes
Accepted for publication Dec 8, 1972.

Reprint requests to 6400 Brushwood Ct, Dayton, OH 45415 (Dr. Holdsworth).

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