Methods of reprogramming renal cells

a technology of reprogramming and renal cells, applied in the field of isolated populations of renal progenitor cells, can solve the problems of extremely high morbidity and mortality rates, loss of specific tasks,

Inactive Publication Date: 2011-12-22
TEL HASHOMER MEDICAL RES INFRASTRUCTURE & SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0028]Unless otherwise defined, all technical and/or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention pertains. Although methods and materials similar or equivalent to those described herein can be used in the practi...

Problems solved by technology

Genetic diseases affecting the various cell types of the nephron are the leading cause of end-stage renal disease (ESRD) in the pediatric population which requires renal replacement therapy (dialysis, transpla...

Method used

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  • Methods of reprogramming renal cells
  • Methods of reprogramming renal cells
  • Methods of reprogramming renal cells

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example 1

TSA / AzaC Treatment

[0140]The following experiments were performed in order to determine whether epigenetically repressed genes could be restored by treatment with a combination of the demethylating agent 5-aza-2′-deoxycytidine and the HDAC inhibitor TSA. Thus, human adult kidney cells were initially cultured in the presence or absence of TSA / AzaC for 24 hours. Changes in gene expression in at least three independent samples of human adult kidneys were analyzed after 24-h TSA / AzaC treatment by quantitative RT-PCR. In all cases a robust re-activation pattern was found including Six2 and Osr1 but not Sall1, Wt1 and Pax2 (FIGS. 1A-E). A wide-range of Six2 reinduction levels was noted (five-fold to 25-fold), probably due to primary culture heterogeneity. Several pluripotency / self-renewal genes, among which are Oct4, Nanog and Klf4, have been characterized to be crucial for somatic cell reprogramming. Therefore, the present inventors determined whether TSA / AzaC treatment brings about chang...

example 2

VPA Treatment

[0141]The following experiments were performed in order to determine the effects of VPA, an HDAC inhibitor on kidney cells. Changes in renal progenitor gene levels were assessed initially in adult human kidneys following a 24-hour VPA exposure. In contrast to TSA / AzaC, activation of Six2 was much similar among independent samples and a dose-dependent reinduction of Six2 could be observed in the presence of VPA (five-fold increase) (FIG. 2A). Furthermore, in addition to Six2, both Osr1 and Sall1 were found to be upregulated in a dose-dependent manner, while Pax2 levels were mildly elevated and Wt1 reduced (FIGS. 2A-E). Analysis of the pluripotency genes showed Nanog and Klf4 to be significantly up-regulated in all VPA concentrations, and Oct4 particularly in VPA-2 mM, while Vimentin / E-cadherin analysis demonstrated Vimentin levels to be mostly unchanged while E-cadherin mildly elevated (VPA-2 mM, 4 mM) (FIGS. 2F-J).

[0142]Almost exact findings were noted in human fetal ki...

example 3

Changes in Protein Levels Following VPA Treatment

[0143]Having established that similar to TSA / AzaC, VPA treatment results in activation of specific renal progenitor genes as well as pluripotency genes, but also induces Sall1 and that these changes fluctuate less across human kidney samples, the present inventors analyzed changes at the protein level following exposure to 2 and 4 mM VPA. For western analysis the present inventors concentrated on Six2 protein as it was most substantially induced and it has a major role in specifying the renal stem cell population in the MM. Wt1, which is not induced at the gene level, was concomitantly analyzed. Western blots performed on both human fetal and adult kidney cells 24-h after VPA exposure clearly demonstrated an increment in Six2 protein levels in both types of cells (4 mM) and no changes in Wt1, both following their gene expression pattern (FIG. 3). Because certain surface markers characterize renal progenitor cells, FACS analysis of hum...

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Abstract

A method of reprogramming a differentiated renal cell towards a progenitor phenotype is disclosed. The method comprises up-regulating in the differentiated renal cell an expression of at least one pluripotency associated gene and/or at least one renal stem cell associated gene, thereby reprogramming the differentiated renal cell towards a progenitor phenotype. Cell populations generated thereby and uses thereof are also disclosed.

Description

FIELD AND BACKGROUND OF THE INVENTION[0001]The present invention, in some embodiments thereof, relates to isolated populations of renal progenitor cells and methods of generating and using same.[0002]The fundamental functional unit of the kidney required for urine formation is the nephron. The number of nephrons in the human adult kidney (HAK) ranges from 300,000 to a million. The human metanephros (direct embryonic precursor tissue of the adult kidney) appears at the 5th week of gestation and renal stem / progenitor cells in a discrete region of the metanephros termed the metanephric / nephrogenic mesenchyme (MM) are induced to undergo mesenchymal-to-epithelial transition (MET) and form all epithelial cell types of the nephron until 34 weeks of gestation. These include glomerular (parietal, visceral) and tubular (proximal, distal) epithelia (which can be detected by segment-specific markers) but not collecting ducts. Thus, endowment of new nephrons is restricted to prenatal development...

Claims

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Application Information

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IPC IPC(8): A61K35/23A61P13/12C12N5/071C12Q1/68C12N5/07C12N15/85
CPCC12N5/0687C12N2501/06C12N2501/065C12N15/85C12N2506/25C12N5/0696C12N2501/415A61P13/12A61K35/22C12N5/0686C12N2500/90
Inventor BENJAMIN, DEKELHARARI-SHTEINBERG, ORIT
Owner TEL HASHOMER MEDICAL RES INFRASTRUCTURE & SERVICES
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