The present invention relates to a transformed plant cell expressing
.beta.-amyloid gene, which is known as a causal substance of senile
dementia in human, a transformed plant and a preparation method of the
same, more particularly, to a transformed plant cell expressing tandem
repeats of .beta.-amyloid gene, a transformed plant produced by
tissue-culturing the above cells and a preparation method of the same.
The transformed plant of the present invention expresses multiple
.beta.-amyloid protein, so that the plant can be effectively used for the
preparation of an oral vaccine composition for the prevention of senile
dementia in human.