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The structure of growth hormone (GH) Cells is relatively stable. A massive GH cell hyperplasia is known only in rare cases with growth hormone releasing factor (GRF) excess from tumors. Prolactin cells can be stimulated by drugs, neurotransmitters, and hormones which decrease the dopamine inhibition. Adrenocorticotropic hormone (ACTH) cells are stimulated by stress, some hormones, loss of adrenals, and drugs which activate the \u03b1<jats:sub>1<\/jats:sub>\u2010 and \u03b2\u2010redceptors or inhibit the \u03b1<jats:sub>2<\/jats:sub>\u2010receptors. They are suppressed and changed into Crook's cells by treatment with glucocorticoids. Thyroid\u2010stimulating hormone (TSH) cells increase in number and size in states of over\u2010stimulation especially by thyrotropin releasing hormone (TRH). A decrease results from hyperthyroidism and possibly from somatostatin, <jats:sub>L<\/jats:sub>\u2010dopa, and dopamine. Gonadotroph cells transform into castration cells in strongly hyperactive states (gonadectomy, antiandrogens, gonadotropin releasing hormone [Gn\u2010RH]agonists, aminoglutethimide). Special types of pituitary adenomas can be treated with drugs which suppress hormone production and proliferation. Dopamine agonists and somatostatin reduce the tumor size of varying proportions of GH secreting adenomas in acromegaly. Ultrastructurally, a decrease of cytoplasmic and nuclear volume and an increase of lysosomes are found. Bromocriptine and other dopamine agonists are establiched in the treatment of prolactin secreting adenomas. They induce a shrinkage in many cases. Ultrastructurally, a reduction of cellular and nuclear size, an increase in number of secretory granules and of lysosomes, and a reduction of rough endoplasmic reticulum can be demonstrated.<\/jats:p>","DOI":"10.1002\/jemt.1070200205","type":"journal-article","created":{"date-parts":[[2005,2,23]],"date-time":"2005-02-23T17:52:57Z","timestamp":1109181177000},"page":"162-176","source":"Crossref","is-referenced-by-count":13,"title":["Effect of drugs on pituitary ultrastructure"],"prefix":"10.1002","volume":"20","author":[{"given":"W.","family":"Sager","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,2,4]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"381","article-title":"Growth hormone and prolactin secretion by dispersed cell cultures of human pituitary adenomas","volume":"53","author":"Adams E. 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