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Mammosomatotroph adenoma cells secrete both growth hormone and prolactin.

Pituitary adenoma cells from a mammosomatotroph adenoma obtained from a 21-year-old female presenting with acromegaly and amenorrhea were investigated by sandwich cell immunoblot assay, immunohistochemistry, and electron microscopy. The new, simple technique of sandwich cell immunoblot assay could detect two hormones secreted in the same one cell, and found that 89% of mammosomatotrophs secreted both growth hormone (GH) and prolactin (PRL). Immunohistochemistry showed that the tumor cells were positive for both GH and PRL. Electron microscopy showed cells contained granules ranging in size form 150 to 500 nm. This is the first demonstration of both GH and PRL in the same mammosomatotroph cell. Sandwich cell immunoblot assay can measure the amount of secreted hormone, allowing a new approach to the investigation of mammosomatotroph adenomas.