Effects of hormonal therapies and dietary soy phytoestrogens on vaginal cytology in surgically postmenopausal macaques.
OBJECTIVE
To evaluate the effects of conjugated equine estrogens, medroxyprogesterone acetate (MPA), conjugated equine estrogens combined with MPA, tamoxifen, and soybean estrogens on vaginal cytology in surgically postmenopausal cynomolgus macaques (Macaca fascicularis).


METHODS
Randomized long-term experimental trial.


METHODS
Cytologic samples were taken from animals in two long-term randomized studies of the effects of hormonal and dietary effects on atherosclerosis.


METHODS
Surgically postmenopausal cynomolgus macaques.


METHODS
Conjugated equine estrogens at the doses given do not exert an estrogenic effect on the with MPA, tamoxifen, and soybean estrogens were given via the diet, at doses scaled from those given to women.


METHODS
Vaginal cytologic maturation index.


RESULTS
Conjugated equine estrogens elicited a marked maturation effect, which was antagonized partially by the addition of MPA. Tamoxifen produced a lesser estrogenic response. The cytologic pattern in animals given soybean estrogens or MPA alone did not differ from that of controls.


CONCLUSIONS
Soybean estrogens at the doses given do not exert an estrogenic effect on the vagina of macaques. Conjugated equine estrogens are potent inducers of vaginal keratinization in this model; tamoxifen has a lesser effect. Medroxyprogesterone acetate partially antagonizes the effects of conjugated equine estrogens, and has no effect when given alone. The results support the possibility that soybean estrogens may be a "tissue-selective" estrogen with minimal effects on the reproductive tract.
Cline
J M
JM
Department of Comparative Medicine, Bowman Gray School of Medicine, Winston-Salem, North Carolina 27157-1040, USA.
Paschold
J C
JC
Anthony
M S
MS
Obasanjo
I O
IO
Adams
M R
MR
D000818:Animals; D004032:Diet; D004847:Epithelial Cells; D004966:Estrogens, Conjugated (USP) / Q000627:therapeutic use*; D004968:Estrogens, Non-Steroidal / Q000008:administration & dosage / Q000627:therapeutic use*; D005260:Female; D006736:Horses; D007529:Isoflavones; D008252:Macaca fascicularis; D017258:Medroxyprogesterone Acetate / Q000627:therapeutic use*; D048789:Phytoestrogens; D028321:Plant Preparations; D017698:Postmenopause; D013025:Glycine max / Q000737:chemistry*; D013629:Tamoxifen / Q000627:therapeutic use; D014621:Vagina / Q000166:cytology*
D004966:Estrogens, Conjugated (USP); D004968:Estrogens, Non-Steroidal; D007529:Isoflavones; D048789:Phytoestrogens; D028321:Plant Preparations; D013629:Tamoxifen; D017258:Medroxyprogesterone Acetate