ONCONASE® Profile

Chemistry

ONCONASE® (ranpirnase) is a single peptide chain containing 104 amino acids. Ranpirnase has a molecular mass of approximately 12,000 daltons and an isoelectric point of approximately 9.5. The amino terminal residue is pyroglutamate.

Mechanism Of Action

In cancer cells, ONCONASE-induced intracellular RNA degradation triggers several biological effects simultaneously including the induction of the "intrinsic" (mitochondria) pathway of apoptosis and modulation of the expression of several key cell cycle regulatory factors

    

Cytotoxic Activity of ONCONASE


HL-60 Leukemia
Untreated Control
HL-60 Leukemia
RNP-treated

The hyper-condensed and fragmented chromatin
in majority of cells in juxtaposition with normally
appearing cells is characteristic of apoptosis.

U-937 Leukemia
Untreated Control
U-937 Leukemia
RNP-treated

Fragmented apoptotic cells and cells with
induced non-specific esterase are noted. This
is consistent with induction of differentiation.

MCF-7 Breast Cancer
Untreated Control
MCF-7 Breast Cancer
RNP-treated

The hyper-condensed chromatin and the morphological changes
in the form of multiple cytoplasmic extensions are consistent
with pre-apoptotic and differentiation-inducing effects.

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