title: Expression profiles of the glucose-dependent insulinotropic peptide receptor and LHCGR in sporadic adrenocortical tumors.
abstract: Glucose-dependent insulinotropic peptide receptor (GIPR) and LHCGR are G-protein-coupled receptors with a wide tissue expression pattern. Aberrant expression of these receptors has rarely been demonstrated in adult sporadic adrenocortical tumors with a lack of data on pediatric tumors. We quantified the GIPR and LHCGR expression in a large cohort of 55 patients (25 children and 30 adults) with functioning and non-functioning sporadic adrenocortical tumors. Thirty-eight tumors were classified as adenomas whereas 17 were carcinomas. GIPR and LHCGR expression were analyzed by real-time PCR and normal human pancreatic and testicular tissue samples were used as positive controls. Mean expression values were determined by fold increase in comparison with a normal adrenal pool. GIPR mRNA levels were significantly higher in adrenocortical carcinomas than in adenomas from both pediatric and adult groups. LHCGR expression was similar in both carcinomas and adenomas from the pediatric group but significantly lower in carcinomas than in adenomas from the adult group (median 0.06 and 2.3 respectively, P<0.001). GIPR was detected by immunohistochemistry in both pediatric and adult tumors. Staining and real-time PCR results correlated positively only when GIPR mRNA levels were increased at least two-fold in comparison with normal adrenal expression levels. In conclusion, GIPR overexpression was observed in pediatric and adult adrenocortical tumors and very low levels of LHCGR expression were found in all adult adrenocortical carcinomas.
authors.affiliation: Laboratório de Hormônios e Genética Molecular LIM/42, Divisão de Endocrinologia e Metabologia, Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, Avenue Dr Eneas de Carvalho Aguiar, São Paulo, SP, Brazil. mhsc@usp.br
authors.forename: Marcia Helena Soares
authors.initials: MH
authors.lastname: Costa
authors.forename: Ana Claudia
authors.initials: AC
authors.lastname: Latronico
authors.forename: Regina Matsunaga
authors.initials: RM
authors.lastname: Martin
authors.forename: Angela S
authors.initials: AS
authors.lastname: Barbosa
authors.forename: Madson Q
authors.initials: MQ
authors.lastname: Almeida
authors.forename: Claudimara Ferini Pacicco
authors.initials: CF
authors.lastname: Lotfi
authors.forename: Helena P Lima
authors.initials: HP
authors.lastname: Valassi
authors.forename: Mirian Yumie
authors.initials: MY
authors.lastname: Nishi
authors.forename: Antonio Marmo
authors.initials: AM
authors.lastname: Lucon
authors.forename: Sheila Aparecida
authors.initials: SA
authors.lastname: Siqueira
authors.forename: Maria Claudia Nogueira
authors.initials: MC
authors.lastname: Zerbini
authors.forename: Luciani Renata
authors.initials: LR
authors.lastname: Carvalho
authors.forename: Berenice Bilharinho
authors.initials: BB
authors.lastname: Mendonca
authors.forename: Maria Candida Barisson Villares
authors.initials: MC
authors.lastname: Fragoso
mesh_terms: D000293:Adolescent; D000306:Adrenal Cortex Neoplasms / Q000235:genetics*; D018246:Adrenocortical Adenoma / Q000235:genetics*; D018268:Adrenocortical Carcinoma / Q000235:genetics*; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005260:Female; D015870:Gene Expression; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics*; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D011964:Receptors, Gastrointestinal Hormone / Q000235:genetics*; D011974:Receptors, LH / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D011964:Receptors, Gastrointestinal Hormone; D011974:Receptors, LH; C041086:gastric inhibitory polypeptide receptor