Journal List > J Korean Soc Transplant > v.29(3) > 1034457

Jae, Kyung, Sang, Hyun, Dong, Yu, and Suh: Retinoic Acid-induced Differentiation of Rat Mesenchymal Stem Cells into -Cell Lineage

Abstract

Backgrounds

Type I diabetes mellitus (T1DM), an autoimmune disease, is associated with insulin deficiency due to the death of -cells. Bone marrowderived mesenchymal stem cells (BM-MSCs) are capable of tissue repair and thus are a promising source of -cell surrogates.

Methods

In this study, the therapeutic potential of BM-MSCs as -cell replacements was analyzed both in vitro and in vivo. First, we used retinoic acid (RA) to induce rat BM-MSCs to differentiate into cells of endodermal/pancreatic lineage. Then, differentiated rat BM-MSCs were syngeneically injected under the renal capsule of rats.

Results

Analysis of gene expression revealed that rat BM-MSCs showed signs of early pancreatic development, and differentiated cells were qualitatively and quantitatively confirmed to produce insulin in vitro. In vivo study was performed for short-term (3 weeks) and long-term (8 weeks) period of time. Rats that were injected with differentiated MSCs exhibited a reduction in blood glucose levels throughout 8 weeks, and grafted cells survived in vivo for at least 3 weeks.

Conclusions

These findings show that RA can induce differentiation of MSCs into the -cell lineage and demonstrate the potential of BM-MSCs to serve as therapeutic tools for T1DM.

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Fig. 1.
Fluorescence-activated cell sorting analysis for characterization of rat mesenchymal stem cells (MSCs) at passage 3. Abbreviation: IgG, immunoglobulin G.
jkstn-29-118f1.tif
Fig. 2.
Morphological changes of differentiated rat bone marrowderived mesenchymal stem cells. (A, B) Week 1. (C, D) Week 2. (E, F) Week 3 (A, C, E: ×40; B, D, F: ×100).
jkstn-29-118f2.tif
Fig. 3.
Reverse-transcriptase polymerase chain reaction of rat bone marrowderived mesenchymal stem cells (rBM-MSCs). Lanes 1 to 3: differentiated rBM-MSCs from week 1 to 3. Abbreviations: FoxA2, forkhead box A2; PDX-1, pancreatic-duodenal homeobox 1; Ngn3, neurogenin 3; Pax4, paired box gene 4; GAPDH, glyceraldehyde 3-phosphate dehydrogenase.
jkstn-29-118f3.tif
Fig. 4.
Immunocytochemistry of differentiated rat bone marrowderived mesenchymal stem cells at week 3. (A) Insulin (green). (B) 4’, 6-diamidino-2-phenyindole (DAPI, blue). (C) Light microscopic image. (D) Merged insulin and DAPI images. (E) Merged insulin, DAPI, and light microscopic images (magnification, ×100; scale bar=200  m).
jkstn-29-118f4.tif
Fig. 5.
Insulin secretion from differentiated rat bone marrowderived mesenchymal stem cells (MSCs) measured by enzyme-linked Immunosorbent Assay at week 3 (n=9). a P<0.05.
jkstn-29-118f5.tif
Fig. 6.
Blood glucose levels of rats observed for 3 (A, B) or 8 (C) weeks. (A) Positive control (n=4) and sham control (n=4). (B) Blood glucose level of normal mesenchymal stem cell (MSC)-injected (n=9) and differentiated MSC-injected (n=8) rats. (C) Positive control (n=4) and differentiated MSC-injected (n=8) rats. (D) Linear regression of blood glucose levels from MSC-injected (n=9) and differentiated MSC-injected (n=8) rats. Slope for MSC-injected group=−0.4935±0.5103; slope for differentiated MSC-injected group=−1.728±0.7725.
jkstn-29-118f6.tif
Fig. 7.
3,3’-Diaminobenzidine-stained tissue. (A) Cells located along the inner surface of the tissue membrane. (B) Cell that migrated a short distance into the tissue (marked by yellow arrowhead) (magnification: ×100; scale bar=200 m).
jkstn-29-118f7.tif
Fig. 8.
PKH26-labeled cells in kidney capsule (marked by yellow arrowheads). (A, B) Cell located along the inner surface of the tissue membrane. (C) Cells that migrated a short distance into the tissue (magnification: ×100; scale bar=200  m).
jkstn-29-118f8.tif
Table 1.
Primers for rat bone marrowderived mesenchymal stem cells
Gene Sequence Accession number Product size (bp) Annealing Temperature (o C) Cycles
FoxA2 Sense: 5’-AAG GGA AAT GAC AGG CTG AGT GGA-3’ Antisense: 5’-TGT GGA ACT CTG GCA TTC TAG CCA-3’ NM_012743.1 581 63 30
PDX-1 Sense: 5’-TGC CAC CAT GAA TAG TGA GGA GCA-3’ Antisense: 5’-CGC GTG AGC TTT GGT GGA TTT CAT-3’ NM_022852.3 394 63 30
Ngn3 Sense: 5’-TTA CAA AGA TCG AGA CCC TGC GCT-3’ Antisense: 5’-AAG AGC CAG TGA GGT AAG ACG CAA-3’ NM_021700.1 670 63 30
Pax4 Sense: 5’-AGC TGA GGC ACT GGA GAA AGA GTT-3’ Antisense: 5’-AGC ACA GCT GAC AGA AGG AAG GAT-3’ NM_031799.1 305 63 30
C-peptide Sense: 5’-TGT CAA ACA GCA CCT TTG TGG TCC-3’ Antisense: 5’-AGT GGT GGA CTC AGT TGC AGT AGT-3’ NM_019129.3 500 63 30

Abbreviations: FoxA2, forkhead box A2; PDX-1, pancreatic-duodenal homeobox 1; Ngn3, neurogenin 3; Pax4, paired box gene 4; GAPDH, glyceraldehyde 3-phosphate dehydrogenase.

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