Methods of measuring cell purity for making quality control determinations and related compositions
First Claim
1. A method of detecting human pluripotent stem cells in a sample comprising:
- mixing a sample comprising cells suspected of containing human pluripotent stem cells with nanoparticles, wherein the nanoparticles comprise;
a) a gold or silver core;
b) a Raman reporter molecule next to the surface of the gold or silver core;
c) a layer of thiol polyethylene glycol encapsulating the Raman reporter molecule; and
d) a specific binding agent capable of selectively binding with a target cell surface marker of human pluripotent stem cells;
wherein the mixing is done under conditions such that the specific binding agent binds target cell surface marker providing nanoparticles bound to human pluripotent stem cells;
manipulating the sample under conditions such that nanoparticles not bound to human pluripotent stem cells are separated from the sample providing a purified sample;
exposing the purified sample to electromagnetic radiation providing scattering associated with the Raman reporter molecule;
detecting an intensity of scattering associated with the Raman reporter molecule being exposed to the electromagnetic radiation indicating that the human pluripotent stem cells are in the sample;
quantifying the number of human pluripotent stem cells in the sample based on the intensity of scattering;
and wherein the number of human pluripotent stem cells in the sample is quantified to be less than 0.01 percent of the total cells in the sample.
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Abstract
This disclosure relates to methods of detecting and quantifying low concentrations of cells in a sample with targeted nanoparticles having Raman reporters using surface-enhanced Raman scattering for detection. In certain embodiments, the sample is a group of cells derived from stem cells that have been differentiated into specific cell types and one is detecting residual stem cells or other progeny in order to quantify the purity of the sample. In certain embodiments, the targeted nanoparticles contain two or more Raman reporters for the purpose of multiplexing. In certain embodiments, purity measurements are used to make quality control determinations.
10 Citations
13 Claims
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1. A method of detecting human pluripotent stem cells in a sample comprising:
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mixing a sample comprising cells suspected of containing human pluripotent stem cells with nanoparticles, wherein the nanoparticles comprise; a) a gold or silver core; b) a Raman reporter molecule next to the surface of the gold or silver core; c) a layer of thiol polyethylene glycol encapsulating the Raman reporter molecule; and d) a specific binding agent capable of selectively binding with a target cell surface marker of human pluripotent stem cells; wherein the mixing is done under conditions such that the specific binding agent binds target cell surface marker providing nanoparticles bound to human pluripotent stem cells; manipulating the sample under conditions such that nanoparticles not bound to human pluripotent stem cells are separated from the sample providing a purified sample; exposing the purified sample to electromagnetic radiation providing scattering associated with the Raman reporter molecule; detecting an intensity of scattering associated with the Raman reporter molecule being exposed to the electromagnetic radiation indicating that the human pluripotent stem cells are in the sample; quantifying the number of human pluripotent stem cells in the sample based on the intensity of scattering; and wherein the number of human pluripotent stem cells in the sample is quantified to be less than 0.01 percent of the total cells in the sample. - View Dependent Claims (2, 3, 4, 5)
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6. A composition comprising a nanoparticle, wherein the nanoparticles comprise:
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a) a gold or silver core; b) a Raman reporter molecule about the surface of the gold or silver core; c) a layer of thiol polyethylene glycol encapsulating the Raman reporter molecule; and d) a specific binding agent capable of selectively binding with a target cell surface marker, wherein the specific binding agent is a pentameric TRA1-60 immunoglobulin M antibody, and wherein the immunoglobulin density is between 50 and 150 antibodies per particle. - View Dependent Claims (7)
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8. A composition comprising a nanoparticle, wherein the nanoparticles comprise:
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a) a gold or silver core; b) a Raman reporter molecule about the surface of the gold or silver core; c) a layer of thiol polyethylene glycol encapsulating the Raman reporter molecule; and d) a specific binding agent capable of selectively binding with a target cell surface marker, wherein the specific binding agent is a monomeric SSEA-5 immunoglobulin G antibody, and wherein the immunoglobulin density is between 15 and 30 antibodies per particle. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification