HIGH DENSITY 3D HEPATOCYTE SPHEROID PLATFORM FOR DRUG ADME STUDIES
The present disclosure relates to methods for evaluating the interaction of a candidate compound on 3D hepatocyte spheroid in an invitro culture, including evaluating the metabolism of a candidate compound, for use in various biochemical and molecular biology studies. The methods are performed in labware that combine 3D spheroid culture with micro-patterned design that allows for multiple to several hundreds of spheroids to be treated under the same conditions and to produce sufficient materials (e.g., parent drug, drug metabolites, DNA, RNA, and proteins from cells) and higher detection signal intensity for ADME/Tox (absorption, distribution, metabolism, excretion and toxicity) studies. The methods allow for, among other uses, the investigation and generation of accurate invitro intrinsic clearance data and thus more accurate prediction of in vivo clearance, particularly with low clearance compounds.
1 . An assay method for evaluating the interaction of one or more low clearance candidate compounds with hepatocytes, comprising:
culturing hepatocytes in a cell culture article to form a spheroid, wherein the cell culture article comprises a chamber, the chamber comprising an array of microcavities, each microcavity structured to constrain the hepatocytes to grow in a 3D spheroid confirmation to form a hepatocyte spheroid; wherein each microcavity of the chamber comprises:
a top aperture; and a liquid impermeable bottom comprising a bottom surface, wherein at least a portion of the bottom comprises a low-adhesion or no-adhesion material in or on the bottom surface;
contacting the 3D hepatocyte spheroid with one or more low clearance candidate compounds; and
measuring the in vitro intrinsic clearance of the one or more candidate compounds.
2 . The assay method of claim 1 , wherein the culture is a long-term culture.
3 . (canceled)
4 . The assay method of claim 1 , wherein the liquid impermeable bottom comprising the bottom surface is gas-permeable.
5 . The assay method of claim 1 , wherein the bottom surface comprises a concave bottom surface, the concave surface comprising a hemi-spherical surface, a conical surface having a taper of 30 to about 60 degrees from the side walls to the bottom surface, or a combination thereof.
6 . The assay method of claim 1 , wherein at least a portion of the bottom is transparent.
7 . (canceled)
8 . The assay method of claim 1 , wherein each microcavity of the chamber further comprises a side wall, wherein the side wall surface comprises a vertical cylinder, a portion of a vertical conic of decreasing diameter form the chamber's top to bottom surface, a vertical square shaft having a conical transition to the concave bottom surface, or a combination thereof.
9 . (canceled)
10 . The assay method of claim 1 , wherein the cell culture article comprises from 1 to about 2,000 of said chambers, wherein each chamber is physically separated from any other chamber.
11 . The assay method of claim 1 , wherein the in vitro intrinsic clearance of the one or more low clearance candidate compounds is measured by disappearance of the one or more low clearance candidate compounds.
12 . The assay method of claim 1 , wherein the in vitro intrinsic clearance of the one or more low clearance candidate compounds is measured by the formation of metabolites from the one or more low clearance candidate compounds.
13 . The assay method of claim 1 , wherein the measured in vitro intrinsic clearance of the one or more low clearance candidate compounds is utilized to predict in vivo half-life of the one or more low clearance candidate compounds.
14 . The assay method of claim 1 , wherein the measured in vitro intrinsic clearance of the one or more low clearance candidate compounds is utilized to predict in vivo clearance of the one or more low clearance candidate compounds.
15 . The assay method of claim 1 , further comprising the step of analyzing metabolites of the one or more low clearance candidate compounds, wherein the metabolites are generated during the incubation of the 3D spheroid hepatocytes with the one or more low clearance candidate compounds.
16 . The assay method of claim 15 , wherein analyzing metabolites of the one or more candidate compounds comprises;
identification of metabolites of the one or more candidate compounds generated during the incubation of the 3D spheroid hepatocytes with the one or more low clearance candidate compounds;
quantification of metabolites of the one or more candidate compounds generated during the incubation of the 3D spheroid hepatocytes with the one or more low clearance candidate compounds; or
a combination thereof.
17 . (canceled)
18 . The assay method of claim 1 , further comprising the step of analyzing the molecular, biochemical, or genetic effects of the one or more low clearance candidate compounds on the 3D spheroid hepatocytes.
19 . The assay method of claim 18 , wherein analyzing the molecular, biochemical, or genetic effects of the one or low clearance candidate compounds on the 3D spheroid hepatocytes comprises measuring DNA, RNA, and/or proteins produced by the 3D spheroid hepatocytes during the incubation of the 3D spheroid hepatocytes with the one or more low clearance candidate compounds.
20 . The assay method of claim 1 , wherein the hepatocytes comprise primary human hepatocytes or a hepatocyte cell line.
21 . (canceled)
22 . The assay method of claim 1 , further comprising evaluating a plurality of candidate compounds simultaneously.
23 . The assay method of claim 1 , wherein the 3D spheroid hepatocytes are functionally stable for at least 3 weeks.
24 . The assay method of claim 23 , wherein the functional stability of the 3D spheroid hepatocytes is determined by measuring metabolic activity, cell function, gene expression, or a combination thereof.
25 . The assay method of claim 24 , wherein the functional stability is measured by CYP3A4 activity.