| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
First, we transplanted metanephroi (MN) between cloned pig fetuses and gilts; they grew to about 3 cm and produced urine, although hydronephrosis was eventually observed because of the lack of an excretion pathway. Second, we demonstrated the construction of urine excretion pathways in rats. Rat MN or MN with bladders (CLs) were transplanted into host rats. Then, we connected the host animal’s ureter to the developed CL bladder, a technique called the stepwise peristaltic ureter (SWPU) system. The application of the SWPU system avoided hydronephrosis and permitted the CLs to differentiate well, with CL urine being persistently excreted through the recipient ureter. This is the first report showing that the SWPU system may resolve two important problems in the generation of kidneys from stem cells: construction of a urine excretion pathway and continued growth of the newly generated kidney.
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