ABSTRACT
PURPOSE: In placentas from uncomplicated pregnancies, Hofbauer cells either disappear or become scanty after the fourth to fifth month of gestation. Immunohistochemistry though, reveals that a high percentage of stromal cells belong to Hofbauer cells. The aim of this study was to investigate the changes in morphology and density of Hofbauer cells in placentas from normal and pathological pregnancies. METHODS: Seventy placentas were examined: 16 specimens from normal term pregnancies, 10 from first trimester's miscarriages, 26 from cases diagnosed with chromosomal abnormality of the fetus, and placental tissue specimens complicated with intrauterine growth restriction (eight) or gestational diabetes mellitus (10). A histological study of hematoxylin-eosin (HE) sections was performed and immunohistochemical study was performed using the markers: CD 68, Lysozyme, A1 Antichymotrypsine, CK-7, vimentin, and Ki-67. RESULTS: In normal term pregnancies, HE study revealed Hofbauer cells in 37.5% of cases while immunohistochemistry revealed in 87.5% of cases. In first trimester's miscarriages and in cases with prenatal diagnosis of fetal chromosomal abnormalities, both basic and immunohistochemical study were positive for Hofbauer cells. In pregnancies complicated with intrauterine growth restriction or gestational diabetes mellitus, a positive immunoreaction was observed in 100 and 70% of cases, respectively. CONCLUSIONS: Hofbauer cells are present in placental villi during pregnancy, but with progressively reducing density. The most specific marker for their detection seems to be A1 Antichymotrypsine. It is remarkable that no mitotic activity of Hofbauer cells was noticed in our study, as the marker of cellular multiplication Ki-67 was negative in all examined specimens.
Subject(s)
Placenta/cytology , Pregnancy Complications/pathology , Chorionic Villi/pathology , Female , Humans , Placenta/pathology , PregnancyABSTRACT
PURPOSE: In placentas from uncomplicated pregnancies, Hofbauer cells either disappear or become scanty after the fourth to fifth month of gestation. Immunohistochemistry though, reveals that a high percentage of stromal cells belong to Hofbauer cells. The aim of this study was to investigate the changes in morphology and density of Hofbauer cells in placentas from normal and pathological pregnancies. METHODS: Seventy placentas were examined: 16 specimens from normal term pregnancies, 10 from first trimester's miscarriages, 26 from cases diagnosed with chromosomal abnormality of the fetus, and placental tissue specimens complicated with intrauterine growth restriction (eight) or gestational diabetes mellitus (10). A histological study of hematoxylin-eosin (HE) sections was performed and immunohistochemical study was performed using the markers: CD 68, Lysozyme, A1 Antichymotrypsine, CK-7, vimentin, and Ki-67. RESULTS: In normal term pregnancies, HE study revealed Hofbauer cells in 37.5% of cases while immunohistochemistry revealed in 87.5% of cases. In first trimester's miscarriages and in cases with prenatal diagnosis of fetal chromosomal abnormalities, both basic and immunohistochemical study were positive for Hofbauer cells. In pregnancies complicated with intrauterine growth restriction or gestational diabetes mellitus, a positive immunoreaction was observed in 100 and 70% of cases, respectively. CONCLUSIONS: Hofbauer cells are present in placental villi during pregnancy, but with progressively reducing density. The most specific marker for their detection seems to be A1 Antichymotrypsine. It is remarkable that no mitotic activity of Hofbauer cells was noticed in our study, as the marker of cellular multiplication Ki-67 was negative in all examined specimens.
OBJETIVO: Em placentas de gestações sem complicações, as células de Hofbauer desaparecem ou se tornam raras após o quarto ou quinto mês de gestação. Entretanto, a imunohistoquímica revela que uma alta porcentagem de células estromais pertencem às células de Hofbauer. O objetivo do presente estudo foi investigar as alterações da morfologia e densidade das células de Hofbauer em placentas de gestações normais e patológicas. MÉTODOS: Foram examinadas 70 placentas: 16 provenientes de gestações normais a termo, 10 de abortos espontâneos no primeiro trimestre, 26 de casos diagnosticados como anormalidade cromossômica do feto, e amostras de tecido placentário com complicações causadas pela restrição de crescimento intrauterino (8) ou pelo diabetes mellitus gestacional (10). Cortes corados com hematoxilina-eosina (HE) foram submetidos a estudo histológico e imunohistoquímico utilizando-se os seguintes marcadores: CD 68, lisozima, antiquimotripsina A1, CK-7, vimentina, e Ki-67. RESULTADOS: Em gestações normais a termo, o estudo HE revelou células de Hofbauer em 37,5% dos casos, enquanto a imunohistoquímica as revelou em 87,5% dos casos. Em abortos do primeiro trimestre e em casos de diagnóstico prenatal de anormalidades cromossômicas fetais, tanto o estudo básico como o estudo imunohistoquímico foram positivos para células de Hofbauer. Em gestações complicadas pela restrição de crescimento intrauterino ou pelo diabetes mellitus gestacional, imunoreação positiva foi observada respectivamente em 100 e 70% dos casos. CONCLUSÕES: As células de Hofbauer estão presentes nos vilos placentários durante a gestação, embora com densidade progressivamente reduzida. O marcador mais específico para sua detecção parece ser a antiquimotripsina A1. Vale salientar que atividade mitótica de células de Hofbauer não foi detectada em nosso estudo, uma vez que o marcador de multiplicação celular Ki-67 foi negativo em todas as amostras examinadas.