Summary
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1.
Prolactin is a 21,500 Dalton single-chain polypeptide hormone but may occur in 50 kDa and 150 kDa molecular variants.
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2.
These large PRL variants may be secreted predominantly; this condition is termed “macroprolactinemia”. It is characterized by high immunological and normal biological serum levels of prolactin, and lack of clinical symptoms of hyperprolactinemia.
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3.
The information on PRL is encoded on chromosome 6. Transcription can be enhanced and suppressed by a variety of hormonal factors.
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4.
PRL is secreted in a pulsatile fashion; it displays a circadian rhythm (with a maximum during sleep) and is stimulated by some amino acids. PRL also responds to mechanical stimulation of the breast.
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5.
PRL rises during pregnancy, and maintainance of hyperprolactinemia (and, thereby, physiological infertility) is dependent on the frequency and duration of breast feedings.
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6.
Hypothalamic regulation of prolactin mainly involves tonic inhibition via portal dopamine. The physiological importance of various stimulating factors present in the hypothalamus is still incompletely understood. In particular, there is still no place for TRH in PRL physiology.
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7.
PRL is released in response to stress; this response may be mediated by opioids. The low-estrogen, low-gonadotropin amenorrhea of endurancetraining women is not mediated by prolactin, however.
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8.
Estrogens stimulate PRL gene transcription via at least two independent mechanisms. There are many clinical examples of this estrogen effect on prolactin serum levels, and also on the growth of prolactinomas.
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9.
Mild hyperprolactinemia remains an enigma which cannot satisfactorily be resolved by biochemical or radiological testing. The border between “normal” and “elevated” prolactin is illdefined. The possibility of macroprolactinemia complicates this matter even further.
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10.
The number of drugs which suppress prolactin by acting on pituitary D2 receptors, and which are useful in the treatment of hyperprolactinemia, continues to increase. In the field of ergot alkaloids, parenteral application appears to be a logical solution to the problem of the high first-pass effect; in addition, this form of treatment is frequently better tolerated than the oral route.
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11.
Prolactinoma development is presently being studied employing molecular biological techniques; the question of whether tumorigenesis can be attributed to specific defects of gene regulation remains to be answered.
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Abbreviations
- PRL:
-
prolactin
- rPRL:
-
rat prolactin
- mRNA:
-
messenger ribonucleic acid
- DNA:
-
desoxyribonucleic acid
- MEA:
-
multiple endocrine adenomatosis
- TRH:
-
thyreotropin releasing hormone
- VIP:
-
vasoactive intestinal peptide
- kDa:
-
kilodalton
- EGF:
-
epidermal growth factor
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Presented in part to the European Society for Clinical Investigation, Maastricht, April 27, 1990
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Benker, G., Jaspers, C., Häusler, G. et al. Control of prolactin secretion. Klin Wochenschr 68, 1157–1167 (1990). https://doi.org/10.1007/BF01815271
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DOI: https://doi.org/10.1007/BF01815271