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160<br />
117 <br />
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Softex <br />
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90<br />
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Klotho <br />
1 1 1 2,3 4 <br />
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klotho klotho/<br />
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5 klotho/ <br />
von Kossa, van Geison I MGPαsmooth<br />
muscle actinα SMAALPENPP1 <br />
TEM MGP <br />
klotho/ α SMA <br />
MGP I <br />
<br />
ALP ENPP1 <br />
TEM <br />
MGP <br />
klotho/ <br />
<br />
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P<br />
FAMA <br />
1 1 1 1 1 2 <br />
2 1<br />
1<br />
2 <br />
FAM20A is a member of family with sequence similarity 20 FAM20 which<br />
has three members FAM20A, FAM20B and FAM20C in mammals. We have<br />
reported a transgenic Tg mouse line the lineage 230 exhibiting growth disorder<br />
associated with a 58kb fragment deletion in chromosome 11E1 that encompasses<br />
part of the FAM20A gene. Recently, some studies have reported that patients<br />
with amelogenesis imperfecta caused by FAM20A mutation display several<br />
dental phenotypes including hypoplastic enamel, failure of tooth development<br />
and gingival hyperplasia. In the present study, we aimed to clarify how the loss of<br />
FAM20A protein influenced the development of mouse dental tissues. We have<br />
observed delayed tooth eruption in the homozygous mice of the lineage 230.<br />
Immunohistochemistry indicated that FAM20a protein was expressed in osteoid<br />
tissue and tooth germ of normal mice of the lineage 230, but was not expressed<br />
in homozygous mice of the lineage 230. The light microscopy demonstrated<br />
hypoplastic enamel and gingival hyperplasia in the homozygous mice of the<br />
lineage 230. In conclusion, this study revealed that the FAM20A protein played a<br />
critical role in enamel biomineralization.<br />
P<br />
GABA GABA <br />
1 2 2 2 3 <br />
3 4 1<br />
1<br />
2 <br />
3 4 <br />
<br />
<br />
<br />
GABA <br />
GAD <br />
GABA <br />
GABA GABA <br />
GABA <br />
<br />
OUMS27<br />
RTPCR GABA GABA <br />
<br />
RTPCR GABA GABAA <br />
α2α5β1 GABAB <br />
GABAB1 <br />
GABAB2 mRNA GABAB2 <br />
mRNA <br />
<br />
GABAB GABAB <br />
<br />
P<br />
Polypterus senegalus <br />
Oxydoras niger <br />
1 1 1 1 2 <br />
1<br />
1<br />
2 <br />
5 <br />
<br />
Polypterus senegalus Oxydoras niger <br />
<br />
SGCs <br />
<br />
<br />
<br />
SGCs <br />
SGCs <br />
<br />
50 μm <br />
100 μm <br />
SGCs <br />
<br />
SGCs <br />
SGCs <br />
SGCs