Direct differentiation of hepatic stem-like WB cells into insulin-producing cells using small molecules

doi:10.1038/protex.2013.019

Method Article

Direct differentiation of hepatic stem-like WB cells into insulin-producing cells using small molecules

https://doi.org/10.1038/protex.2013.019

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Recent evidence suggests that experimental induction of hepatocytes into pancreatic cells provides new cell transplantation therapy prospects for type 1 diabetes mellitus. Stepwise differentiation from rat liver epithelial stem-like WB-F344 cells (WB cells) into functional insulin-secreting cells will identify key steps in beta-cell development and may yet prove useful for transplantation therapy for diabetic patients. An essential step in this protocol was the generation of pancreatic precursor cell that express Pdx1 based on induction by a combination of 5-aza-2'-deoxycytidine, trichostatin A, retinoic acid, and a mix of insulin, transferrin and selenite. The Pdx1-expressing cells express other pancreatic markers and contribute to endocrine cells in vitro and in vivo. This study indicates an efficient chemical protocol for differentiating WB cells into functional insulin-producing cells using small molecules, and represents a promising hepatocyte-based treatment for diabetes mellitus.

Cell biology

Diabetes mellitus

Hepatocyte

Small molecules

Insulin-producing cells

WB cells

A progressive decrease in the pancreatic beta-cell mass is the main cause of diabetes and can be counterbalanced by providing new insulin-producing cells (IPCs). Promising islet cell transplantation methods as a means of reversing type 1 diabetes mellitus (DM) have been hampered by islet availability as well as by allograft rejection^1,2. Liver-to-endocrine pancreas transdifferentiation is an attractive strategy for generating beta-cell surrogates since the liver and pancreas share a common bipotential precursor cell within the embryonic endoderm^3,4. Most previously reported induction strategies required genetic manipulation, and induced cells were incomplete and non-selective for beta-cell phenotypes and function^5-7.

Recent progress has been made demonstrating that some small molecules can promote definitive cellular differentiation to induce pluripotent stem cells (PSCs)^6,8 and modulate various stages of beta-cell differentiation from induced PSCs^9,10. For example, 5-aza-2'-deoxycytidine (5-AZA), an inhibitor of DNA methylase, was used to successfully induce Ngn3 expression and endocrine differentiation in the PANC-1 human ductal cell line¹¹. Trichostatin A (TSA), a regulator of chromatin remodeling, triggers the process of dedifferentiation and further endocrine pancreatic differentiation^12,13. Retinoic acid (RA) facilitates the development of Pdx1 pancreatic endocrine progenitor cells and their further differentiation into beta-cells^14,15. Nicotinamide promotes transdifferentiation and maturation of liver stem cells into IPCs¹⁶.

There have already been several reports on the generation of IPCs using small molecules from various sources of stem cells, such as embryonic stem cells and mesenchymal stem cells. However, to date, there has been no report demonstrating that pancreatic beta-cells can be induced from liver stem cells in this way. Therefore, by mimicking embryonic pancreatic development, we explored a stepwise protocol for the formation of IPCs from WB cells to control differentiation in vitro. In this study, efforts were focused on the key step of generating Pdx1-expressing cells as pancreatic progenitors. Several methods for inducing differentiation from stem cells into Pdx1-positive cells have been recently reported^2,14,17,18, but the combination and sequence of small molecules for induction and differentiation remain to be optimized.

We present here a three-step approach for generating functional IPCs from WB cells within only 17 days. A sequential treatment with 5-AZA, TSA, RA, and insulin, transferrin and selenite (ITS) induced efficient differentiation of WB cells into pancreatic precursor cells（WB-A cells）. More than 5% of the cells became Pdx1-expressing pancreatic progenitors in only 10 days, eventually becoming IPCs in a step requiring nicotinamide for 7 days in vitro or transplantation into diabetic nude rats for 60 days in vivo. These IPCs expressed characteristic pancreatic beta-cell marker genes, such as insulin I, insulin II, GK with no evidence of non-beta-gene expression. Moreover, insulin was released in response to glucose concentration and the induced IPCs in vivo could ameliorate hyperglycemia in diabetic rats. The identification of an attractive chemical strategy that induces hepatocyte-derived IPCs is an important approach for diabetes cell therapy in the near future.

DMEM
PAA
1640 medium
A basal medium containing knockout-serum DMEM and the main components: 1 mM -mercaptoethanol, 1% non-essential amino acids, 1% B27 supplement, 2 mM L-glutamine, 2% N2 supplement, 20 ng/ml fibroblast growth factor, 20 ng/ml epidermal growth factor, 100 U/ml penicillin, and 100 mg/ml STZ.
5 M 5-AZA
100 nM TSA
1´ITS
2 M RA
0.5% bovine serum albumin
25 mM glucose
4% phosphate-buffered paraformaldehyde
1% osmium tetroxide
2.5% glutaraldehyde in 0.1M sodium cacodylate buffer (pH 7.4)
1% osmium tetroxide in 0.1 M cacodylate buffer
30% sucrose solution
4% paraformaldehyde
5% bovine serum albumin
0.5% Triton X-100
guinea pig anti-rat insulin (1:100) , goat anti-rat Pdx1 (1:100) antibody , goat anti-guinea pig polyclonal antibody (1:500) and donkey anti-goat polyclonal antibody (1:200)
Hoechst-33342 reagent (1:3000)

HitachiH-7650 transmission electron microscope

Cell culture.

WB cells grow in DMEM supplemented with 10% FBS and 11.1 mM D-glucose, 100 U/ml penicillin, and 100 μg/ml STZ.
INS-1 cells grow in 1640 medium. Induction of WB cells into IPCs.

In the first step :chromatin remodeling

6-well plates plate WB cells in a basal medium at a density of 2 x 105 per well containing knockout-serum DMEM and the main components: 1mM β-mercaptoethanol, 1% non-essential amino acids, 1% B27 supplement, 2 mM L-glutamine, 2% N2 supplement, 20 ng/ml fibroblast growth factor, 20 ng/ml epidermal growth factor, 100 U/ml penicillin, and 100 mg/ml STZ.
5 μM 5-AZA treat with Cells for 48 hours. 3.100 nM TSA treat with cells for 24 hours.

In the second step :induction and differentiation

Cells grow in DMEM with 1 g/L glucose, 1x ITS , 2 μM RA and the main components for 7 days and induce to Pdx-1 expressed cells (WB-A cells). In the last step (maturation)
10 mM nicotinamide in the main components without fibroblast growth factor and epidermal growth factor treat WB-A cells for 7 days to induce to IPCs. Glucose-stimulated insulin release assay in WB-A cells and IPCs in vitro.
Serum-free DMEM with low glucose incubate cells.
Serum-free medium containing 0.5% bovine serum albumin and 5.5 mM glucose starve WB-A cells and IPCs overnight and 25 mM glucose stimulate with for 2 hours. TEM in IPCs in vitro.
A single intraperitoneal injection of STZ at 65 mg/kg body weight inject to WB-A cells (n=6) and WB (n=6) cells and 50 μl PBS (n=3)
When blood glucose reached levels >16.7 mmol/L, DM rats receive 1x 106 WB-A (n=6) cells/rat in 50 μl PBS, and negative controls receive 50 μl PBS (n=3).
Samples receive assay of fasting blood glucose levels every 3 days in samples obtained from the tail vein using a blood glucose test meter and strips.
Three of the six WB-A cell-implanted rats undergo nephrectomy at day 36. The others undergo nephrectomy at day 60 posttransplantation to assess metabolic activity of the transplanted WB-A cells. IPGTT and glucose-stimulated insulin release assay in vivo.
After 6 h of fasting, samples receive assay of fasting glucose and insulin levels from venous blood from small tail clips.
Three groups inject 2 g/kg body glucose intraperitoneally. Blood glucose values were obtained at 15, 30, 60, 90, 120 min. Insulin values were obtained at 30, 60, 90, 120, 150, 180min. Histology and immunofluorescence.
4% paraformaldehyde for 48 hours at 4ºC fix explanted tissues and rat pancreas tissues in samples overnight in a 30% sucrose solution, and embedded with embedding medium. Sections were stained with HE.
Cells and sections receive performation of immunofluorescence of insulin.

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Direct differentiation of hepatic stem-like WB cells into insulin-producing cells using small molecules

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