Physiology

Cytology and Cell Physiology by Geoffrey Bourne (Eds.)

By Geoffrey Bourne (Eds.)

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Detailed analysis of mitochondrial lipids have been made but are beyond the scope of this chapter. , 1948; Schneider and Hogeboom, 1950b). Since repeated efforts to dis­ lodge the RNA from mitochondria, such as washing in various solutions or centrifugation in density gradients (cf. Kuff and Schneider, 1954), were unsuccessful, it may be concluded that RNA is a component of mitochondria, although a minor one. T h e significance of the presence of RNA in isolated mitochondria remains unsolved, however, because despite the manifold functions of these subcellular components, none appears to require the participation of RNA.

One final point with respect to the occurrence of isocitric dehydro­ genase in isolated liver mitochondria should be considered; namely, can the 12% of the total liver activity associated with isolated mitochondria (Hogeboom and Schneider, 1950b) be considered significant from the cytochemical standpoint? We have maintained that adsorption may be responsible for the presence of such small amounts of activity and that independent methods would be required to establish the presence of the enzyme (Schneider and Hogeboom, 1951).

This has led some to conclude that the enzymes had leaked from the nuclei in the latter case. Unfortunately, this is not an unequivocal conclusion (see above). , 1952). Since 4 0 % of the 5'-nucleotidase activity of liver tissue has been recovered in nuclei isolated in sucrose solutions, the failure of the nonaqueous nuclei to hydrolyze this compound is even more striking. A comparison of the published data on the activities of the fresh and of the lyophilized, solvent treated tissues indicates that a major portion of the activity had been lost in the latter case.

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