PDX1-expressing dorsal and ventral foregut endoderm

a dorsal and ventral foregut endoderm technology, applied in the field of cell biology, can solve the problems of limited islet cell donor pancreases, unique challenges, and inability to generate insulin-producing -cells from hescs,

Inactive Publication Date: 2007-05-31
CYTHERA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] Embodiments of the present invention relate to cell cultures of PDX1-negative foregut endoderm cells (foregut endoderm cells). In some embodiments, the foregut endoderm expresses the HNF1b and FOXA1 markers but does not substantially express PDX1. Other embodiments of the present invention relate to cell cultures of PDX1-positive, dorsally-biased, foregut endoderm cells (dorsal PDX1-positive foregut endoderm cells). In some embodiments, the PDX1-positive, dorsally-biased, foregut endoderm cells express one or more markers selected from Table 3 and / or one or more markers selected from Table 4. Additional embodiments, relate to cell cultures of PDX1-positive, ventrally-biased, foregut endoderm cells (ventral PDX1-positive foregut endoderm cells). In some embodiments, the PDX1-positive, ventrally-biased, foregut endoderm cells express one or more markers selected from Table 3 but do not substantially express a marker selected from Table 4 as compared to the expression of the same marker in PDX1-positive, dorsally-biased, foregut endoderm cells.

Problems solved by technology

However, presently it is not known how to generate an insulin-producing β-cell from hESCs.
As such, current cell therapy treatments for diabetes mellitus, which utilize islet cells from donor pancreases, are limited by the scarcity of high quality islet cells needed for transplant.
Although pluripotency imparts extraordinary utility upon hESCs, this property also poses unique challenges for the study and manipulation of these cells and their derivatives.

Method used

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  • PDX1-expressing dorsal and ventral foregut endoderm
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  • PDX1-expressing dorsal and ventral foregut endoderm

Examples

Experimental program
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Effect test

example 1

Human ES cells

[0402] For our studies of endoderm development we employed human embryonic stem cells, which are pluripotent and can divide seemingly indefinitely in culture while maintaining a normal karyotype. ES cells were derived from the 5-day-old embryo inner cell mass using either immunological or mechanical methods for isolation. In particular, the human embryonic stem cell line hESCyt-25 was derived from a supernumerary frozen embryo from an in vitro fertilization cycle following informed consent by the patient. Upon thawing the hatched blastocyst was plated on mouse embryonic fibroblasts (MEF), in ES medium (DMEM, 20% FBS, non essential amino acids, beta-mercaptoethanol, ITS supplement). The embryo adhered to the culture dish and after approximately two weeks, regions of undifferentiated hESCs were transferred to new dishes with MEFs. Transfer was accomplished with mechanical cutting and a brief digestion with dispase, followed by mechanical removal of the cell clusters, wa...

example 2

hESCyt-25 Characterization

[0404] The human embryonic stem cell line, hESCyt-25 has maintained a normal morphology, karyotype, growth and self-renewal properties over 18 months in culture. This cell line displays strong immunoreactivity for the OCT4, SSEA-4 and TRA-1-60 antigens, all of which, are characteristic of undifferentiated hESCs and displays alkaline phosphatase activity as well as a morphology identical to other established hESC lines. Furthermore, the human stem cell line, hESCyt-25, also readily forms embryoid bodies (EBs) when cultured in suspension. As a demonstration of its pluripotent nature, hESCyT-25 differentiates into various cell types that represent the three principal germ layers. Ectoderm production was demonstrated by Q-PCR for ZIC1 as well as immunocytochemistry (ICC) for nestin and more mature neuronal markers. Immunocytochemical staining for β-III tubulin was observed in clusters of elongated cells, characteristic of early neurons. Previously, we treated ...

example 3

Production of SOX17 Antibody

[0405] A primary obstacle to the identification of definitive endoderm in hESC cultures is the lack of appropriate tools. We therefore undertook the production of an antibody raised against human SOX17 protein.

[0406] The marker SOX17 is expressed throughout the definitive endoderm as it forms during gastrulation and its expression is maintained in the gut tube (although levels of expression vary along the A-P axis) until around the onset of organogenesis. SOX17 is also expressed in a subset of extra-embryonic endoderm cells. No expression of this protein has been observed in mesoderm or ectoderm. It has now been discovered that SOX17 is an appropriate marker for the definitive endoderm lineage when used in conjunction with markers to exclude extra-embryonic lineages.

[0407] As described in detail herein, the SOX17 antibody was utilized to specifically examine effects of various treatments and differentiation procedures aimed at the production of SOX17 p...

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Abstract

Disclosed herein are cell cultures comprising dorsal and/or ventral PDX1-positive foregut endoderm cells and methods of producing the same. Also disclosed herein are cell populations comprising substantially purified dorsal and/or ventral PDX1-positive foregut endoderm cells as well as methods for enriching, isolating and purifying dorsal and/or ventral PDX1-positive foregut endoderm cells from other cell types. Methods of identifying differentiation factors capable of promoting the differentiation of dorsal and/or ventral PDX1-positive foregut endoderm cells, are also disclosed.

Description

RELATED APPLICATIONS [0001] This application is a nonprovisional application of and claims priority to U.S. Provisional Patent Application No. 60 / 730,917, entitled PDX1-EXPRESSING DORSAL AND VENTRAL FOREGUT ENDODERM, filed Oct. 27, 2005, the disclosure of which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION [0002] The present invention relates to the fields of medicine and cell biology. In particular, the present invention relates to compositions comprising mammalian foregut endoderm cells and compositions comprising dorsal and / or ventral PDX1-positive foregut endoderm cells and methods of making, isolating and using such cells. BACKGROUND [0003] Human pluripotent stem cells, such as embryonic stem (ES) cells and embryonic germ (EG) cells, were first isolated in culture without fibroblast feeders in 1994 (Bongso et al., 1994) and with fibroblast feeders (Hogan, 1997). Later, Thomson, Reubinoff and Shamblott established continuous cultures of human ES and ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12N5/08C12N5/071C12N5/073
CPCC07K16/18C12N5/0603C12N5/0676C12N2501/119C12N2501/155C12N2501/16C12N2502/13C12N2501/405C12N2501/41C12N2501/415C12N2506/02C12N2510/00C12N2501/385C12N5/0606C12N2501/117C12N2500/38C12N5/0678C12N5/068
Inventor D'AMOUR, KEVINAGULNICK, ALANELIAZER, SUSANBAETGE, E.
Owner CYTHERA
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