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US 8,709,711 B2Granted
Methods of measuring cell viability in tissue engineered products
AssigneeGenzyme Corporation
InventorYongzhong Wang
Life of this patent
Estimating the term…
Abstract
This invention provides methods of measuring the viability of cultured cells by detecting one or more cell death-stable proteins or enzyme activities. Methods provided by the invention correlate viability to relative levels of enzyme activity in cell-containing and non-cell-containing fractions of a cell culture.
Claims8
A method of measuring the fraction of viable cells in a tissue-engineered product maintained in a cell culture conditioned medium comprising:
- (a) taking, as a sample portion, a first percentage of the tissue engineered product containing cells and a proportional second percentage of the cell culture conditioned medium;
- (b) detecting a cell death-stable enzyme activity (Y) in a portion of a cell culture conditioned medium not containing cells of the tissue-engineered product from the sample portion taken in step (a);
- (c) disrupting the membrane integrity of the cells in the sample portion of the tissue engineered product taken in step (a);
- (d) detecting a cell death-stable enzyme activity (X) in the cells and conditioned medium of the sample portion of the tissue-engineered product taken in step (a);
- and
- (e) (i) when the ratio of the first percentage to the second percentage is 1:1, calculating the fraction of viable cells by comparing the level of cell death-stable enzyme activity detected in steps (b) and (d) according to the formula:
- X
- -
- cY
- X
- +
- Y
- wherein
- c
- =
- 1
- -
- f
- f
- and f is the fraction of the total sample conditioned medium present in the portion of the cell culture conditioned medium not containing cells of the cell population;
- or
- (ii) when the ratio of the first percentage to the second percentage deviates from 1:1, calculating the fraction of viable cells by comparing the level of cell death-stable enzyme activity detected in steps (b) and (d) according to the formula:
- X
- -
- cY
- X
- +
- Y
- +
- 2
-
-
- Y
-
- (
- α
- -
- 1
- )
- wherein
- c
- =
- 1
- -
- f
- f
- and f is the fraction of the total sample conditioned medium present in portion of the cell culture conditioned medium not containing cells of the cell population;
- and wherein a is the ratio of the percentage of the total cells to the percentage of the total conditioned medium present in the sample,
- wherein the tissue-engineered product comprises a three-dimensional scaffold or matrix and cells are present in the scaffold or matrix.
46 more elements
Dependencies are inferred from the claim text.