title: Progesterone receptor isoforms expression pattern in human chordomas.
abstract: Steroid hormone receptors are involved in the regulation of tumor growth. Two progesterone receptor (PR) isoforms have been identified in humans: a larger form (PR-B) and the N-terminally truncated one (PR-A). PR isoforms can exert opposite functions and are differentially regulated by estrogens. PR have been detected in several brain tumors including chordomas, however, it is unknown which PR isoform is expressed in brain tumors. The aim of this study was to determine by reverse transcription-polymerase chain reaction (RT-PCR) and by immunohistochemistry the expression pattern of PR isoforms in chordomas as well as its correlation with the expression of estrogen receptor a (ER-alpha). All studied chordomas expressed both PR and ER-alpha. PR-B was the predominant isoform in chordomas both at the mRNA and at the protein level. These data suggest that PR-B should be the predominant PR isoform expressed in human chordomas.
authors.affiliation: Departamento de Biología, Facultad de Química, Universidad Nacional Autónoma de M xico, Mexico. igcar@servidor.unam.mx
authors.forename: I
authors.initials: I
authors.lastname: Camacho-Arroyo
authors.forename: G
authors.initials: G
authors.lastname: González-Agüero
authors.forename: A
authors.initials: A
authors.lastname: Gamboa-Domínguez
authors.forename: M A
authors.initials: MA
authors.lastname: Cerbón
authors.forename: R
authors.initials: R
authors.lastname: Ondarza
mesh_terms: D000293:Adolescent; D000328:Adult; D002817:Chordoma / Q000235:genetics / Q000378:metabolism*; D047628:Estrogen Receptor alpha; D005260:Female; D015870:Gene Expression; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D011960:Receptors, Estrogen / Q000378:metabolism; D011980:Receptors, Progesterone / Q000235:genetics / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012888:Skull Neoplasms / Q000235:genetics / Q000378:metabolism*
chemical_list: D047628:Estrogen Receptor alpha; D011960:Receptors, Estrogen; D011980:Receptors, Progesterone; C101118:progesterone receptor A; C097314:progesterone receptor B