Topologic Assessment by Use of Wholemounts of Mitotic Activity in the Hamster Mammary Gland During the Estrous Cycle

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Abstract
Stained wholemounts of inguinal mammary glands prepared from colchicine-treated LSH/SsLAK hamsters killed at different phases of the estrous cycle were used to determine the temporal and topologic distribution (ducts vs. lobulo-alveolar structures) of mitoses in the mammary gland during the estrous cycle. Two periods, 1 early and 1 late in relation to the event of ovulation, of increased mitotic activity in the mammary gland were identified. These 2 periods differed distinctly from each other in relation to the distribution of mitoses between ducts and lobulo-alveolar structures. The results are discussed in relation to our previous studies of the hamster mammary gland and to fluctuations in ovarian hormones during the estrous cycle.

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