Pituitary-like proopiomelanocortin transcripts in human Leydig cell tumors.

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Pituitary-like proopiomelanocortin transcripts in human Leydig cell tumors.

Proopiomelanocortin is a polypeptide precursor molecule, the processing of which generates ACTH, beta-endorphin, the beta- and gamma-lipotropins, the joining peptide, and the NH2-terminal fragment. Anterior pituitary corticotrophs are the major site of proopiomelanocortin gene expression in man and the predominant, if not sole source of circulating ACTH. Recent data have established that proopi...

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Human Relevance of Rodent Leydig Cell Tumors

Rodents have been used extensively in virtually all fields of biomedical research and have been the primary species used in toxicologic and carcinogenic research. Over many years it has become obvious that some conditions and in particular some tumors in rodents have questionable relevance in humans. Some of these include peroxisome proliferatoractivator receptor-α (PPAR-α) agonist-induced live...

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Characterization of proopiomelanocortin transcripts in human nonpituitary tissues.

Proopiomelanocortin (POMC), the precursor to adrenocorticotropic hormone and other related peptides, was originally identified in the corticotropic cell. Recent evidence shows that POMC products are also normally present in a variety of nonpituitary tissues. To investigate this phenomenon in humans we looked for the presence and characteristics of POMC transcripts in various adult tissues. Blot...

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DNA ploidy and cell phase in human pituitary tumors.

The flow-cytofluorometric technique for nuclear DNA analysis was used in the study of 47 consecutive cases with pituitary tumors. The material consisted of 18 tumors secreting growth hormone (GH), 10 secreting GH and prolactin (PRL), 10 prolactinomas, 2 secreting thyroid-stimulating hormone (TSH), 2 secreting ACTH, and 5 were nonsecreting. An aneuploid DNA pattern occurred in 23 of 47 (49%) cas...

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Leydig cell tumors of the testis.

Leydig cell tumors represent approximately one to three percent of all testicular tumors. Whereas in experimental animals predisposing conditions include administration of chemical carcinogens, hormones and heavy metals, environmental or endogenous factors in man are presently unrecognized. Leydig cell tumors do not show preferential lateralization or tendency for bilaterality. The symptoms are...

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ژورنال

عنوان ژورنال: Journal of Clinical Investigation

سال: 1990

ISSN: 0021-9738

DOI: 10.1172/jci114787