OSCILLATORY VARIATIONS IN THE AMOUNT OF PROTEIN EXTRACTABLE FROM MURINE ERYTHROLEUKEMIA-CELLS - STIMULATION BY INSULIN

The amount of protein extractable from murine erythroleukemia (MEL) ce lls varies in an oscillatory manner at high frequency and high amplitu de as it does for several other cell lines. Moreover, the rhythm appea rs to be modulated in periodic fashion with respect to the mean, perio d and amplitude. The phenomenon thus seems to be universal and fundame ntal. Time series analyses support the view that several periodicities contribute to the observed protein rhythm. Insulin affects the dynami cs as it does for both morphological and phosphorylation oscillations. Caution is necessary in the interpretation of 'specific activities' o f cellular components and in electrophoretic studies wherein equal amo unts of protein are applied to the wells in an effort to correct for r andom errors.