The present invention is drawn, in part, to biocompatible compositions comprising a biocompatible polymer matrix and conditioned cell medium comprising i) a cell culture medium and ii) one or more agents synthesized by and secreted from one or more cells cultured in the cell culture medium, as well as therapeutic uses thereof, particularly in modulating bone and/or gum tissue growth.

Methods for mimicking a tumor microenvironment in vitro are provided. The methods comprise indirectly applying a shear stress upon at least one tumor cell type plated on a surface within a cell culture container. Methods for mimicking tumor metastasis and methods for testing drugs or compounds in such systems are also provided.

The present invention is in the field of the cultivation of biological cells and tissues with organ-like function on a microphysiological scale and provides a method for the microphysiological co-cultivation of 3D organoid tissue and at least one 2D cell layer.

The invention relates to a method for generating a cardiac tissue mimetic, comprising the steps of mixing cardiomyocytes (CM) and fibroblasts (FB) at a ratio from 2.5:1 to 10:1, thereby providing a first mixture, incubating said first mixture, such that said cardiomyocytes and said fibroblasts form a spherical structure, adding endothelial cells (EC) to said spherical structure at a ratio of cardiomyocytes (CM) to endothelial cells (EC) from 1.5:1 to 4:1, thereby providing a second mixture, and incubating said second mixture, such that a cardiac tissue mimetic is formed.

The invention further relates to a cardiac tissue mimetic comprising cardiomyocytes (CM), endothelial cells (EC), and fibroblasts (FB), wherein said cardiac tissue mimetic comprises sarcomeric structures and vascular structures.

Further aspects of the invention are the cardiac tissue mimetic for use in a method for heart tissue repair or replacement and a method for screening a compound using a cardiac tissue mimetic.

An object of the present invention is to provide a new means for suppressing inhibition of proliferation of keratinocytes even when the keratinocytes start to come into contact with each other. The present invention solves the above problem by culturing keratinocytes in contact with a common medium with fibroblasts treated with a composition containing a specific compound.

An in vitro method of producing a population of muscle stem cells comprising co-culturing pluripotent stem cells, embryonic fibroblast cells and endothelial cells in 3D cell culture.

Various embodiments are described herein for creating a 3D human heart model for modelling arrythmias, wherein the method comprises seeding a structure with a mixture of human cardiomyocytes, cardiac fibroblasts and a fibrin mixture to form cardiac tissue; applying a plating media for settlement and compaction of the cardiac tissue; and adding an arrhythmogenic media to the cardiac tissue, where the arrhythmogenic media comprises methyl-beta cyclodextrin for disrupting calcium signaling.

Provided herein are compositions and methods for identifying and using stem cell regulation factors. For example, in some embodiments, provided herein are compositions and methods for identifying stem cell regulation factors using marker gene expression libraries. Also provided herein are compositions and methods for generating differentiated cells lines and uses of such cell lines.

The present disclosure relates to compositions and methods for culturing a population of hepatocytes in vitro, comprising co-culturing the population of hepatocytes with at least one non-parenchymal cell population and incubating the co-culture in culture medium, wherein the co-culture is periodically incubated in culture medium that does not comprise serum (serum-free culture medium).

A method for producing a disease model, including a step of introducing a cancer cell or fibroblast into a recellularized organ or tissue is provided by the present invention.