Originally published as JHC exPRESS on November 12, 2007. doi:10.1369/jhc.7A7353.2007
Volume 56 (2): 193-199, 2008 Copyright ©The Histochemical Society, Inc. Fascin Expression in Human Embryonic, Fetal, and Normal Adult Tissue
Department of Biochemistry and Molecular Biology (F-RZ,ZL,L-YZ,E-ML) and Department of Pathology (F-RZ,L-HT,Z-YS,L-YZ), Medical College of Shantou University, Shantou, Guangdong Province, China Correspondence to: En-Min Li, Department of Biochemistry and Molecular Biology, Medical College of Shantou University, 22 Xinling Road, Shantou City 515041, Guangdong Province, China. E-mail: nmli{at}stu.edu.cn. Co-corresponding author: Li-Yan Xu. E-mail: liyanxu1130{at}yahoo.com.cn
This study investigates the distribution of fascin in human embryonic, fetal, and normal adult tissues. Tissue microarray technology was used to perform immunohistochemical experiments on human embryos and fetuses at 4–22 weeks of gestation and adult specimens. Fascin was widely expressed in the nervous system. At 4 weeks of gestation, fascin was present in the neural tube. At 8–12 weeks of gestation, homogenous gene expression was seen in cells of the cerebellum and gastrointestinal tract. In later developmental stages and in adults, Purkinje cells of the cerebellum and glandular epithelium of the gastrointestinal tract showed no expression. Fascin was expressed in the cortex and medulla of the adrenal gland at 8–12 weeks of gestation, whereas immunoreactivity decreased from the zona glomerulosa through the zona reticularis and was essentially negative in the adrenal medulla of adults. Significant expression of fascin was seen throughout development in neurons, follicular dendritic cells of lymphoid tissue, basal layer cells of stratified squamous epithelia, mesenchyme, and vascular endothelial cells. Simple columnar epithelia of the biliary duct, colon, ovary, pancreas, and stomach were all negative for fascin expression. These results show that expression of fascin is time specific and highly tissue specific. Parallels between fascin expression in embryogenesis and carcinogenesis are discussed. (J Histochem Cytochem 56:193–199, 2008)
Key Words: fascin development embryo tissue microarray immunohistochemistry
FASCIN, ALSO KNOWN AS fascin-1, is a 55-kDa globular actin-bundling protein that organizes F-actin into well-ordered, tightly packed parallel bundles in vitro and in cells (Yamashiro-Matsumura and Matsumura 1985
Fascin, originally found in extracts of unfertilized sea urchin eggs (Otto et al. 1979
Samples Forty human samples were used consisting of 3 embryos, 11 fetuses, and 26 postnatal specimens, as summarized in Table 1 . Intact embryos and fetuses were acquired from the Gynecology and Obstetrics Department of Shantou Central Hospital. Samples were collected from 14 healthy pregnant women undergoing elective termination of pregnancy at 4–22 weeks of gestation. Specimens were immediately fixed in 4% buffered formalin solution, and subsequently, visible organs were embedded in paraffin blocks. Normal human tissue sections (from autopsy specimens) were acquired from the Department of Forensic Medicine of Shantou University Medical College. These specimens were collected from 2002 through 2005. The following tissues were collected: cerebellum, cerebrum, thymus, lung, trachea, cardiac muscle, esophagus, stomach, large intestine, small intestine, liver, pancreas, kidney, spleen, pituitary, adrenal gland, thyroid gland, prostate gland, uterus, and lymph node. All research was carried out with the permission of local ethics committees.
Construction of Tissue Microarrays Representative regions of each tissue were selected from hematoxylin and eosin–stained sections and marked on individual paraffin blocks. Samples were chosen from those specimens for which more tissue was available, so that availability of tissue for correlative studies would not be compromised. Two tissue cores were obtained from each specimen measuring 1.8 mm in diameter and ranging in length from 1.0 to 3.0 mm depending on the depth of tissue in the donor block. Each core was precisely arrayed into a new paraffin block. These microarrays were serially sectioned (4 µm) and stained with hematoxylin and eosin to verify tissue sampling and completeness. Unstained sections were baked overnight at 56C in preparation for immunohistochemistry.
Immunohistochemical Staining
Fascin-positive samples were defined as those showing brown signals in the cell cytoplasm. Immunoreactivity was measured semiquantitatively using a scale from – to +++, where – indicates no detectable immunostaining; + represents <25% of the cells are reactive; ++ represents 25
Fascin in Normal Human Tissues Table 2 summarizes the findings for all tissues studied. As was previously shown in human normal adult tissues, fascin was strongly expressed in vascular endothelial cells, neuronal cells, dendritic cells of lymphoid tissue, the basal layer cells of the stratified squamous epithelia of the skin, the esophagus, and the uterine cervix (Mosialos et al. 1994
Nervous System Expression of fascin was strongly positive in nerve fibers and most cells throughout human development. In early embryos (4 weeks of gestation), the medullary epithelium and all nerve cells were fascin positive (Figures 1A and 1B). Fascin was detected in nerve cells and fibers of fetal cerebrum (Figure 1C). In adult tissues, nerve fibers and cytoplasm of stellate cells and glial cells were also fascin detectable (Figure 1D). In the cerebellum, reactivity was found in all cells of the Purkinje cell layer, granular layer, and molecular layer at 8–12 weeks of gestation (Figure 1E); however, the Purkinje cells showed no immunoreactivity in later developmental stages (Figure 1F).
Cardiovascular System In the cardiovascular system, immunostaining for fascin produced a very strong reactivity in the vascular endothelial cells, whereas few myocardial cells were positive (Figure 2A ). Additionally, except for the capillary vessels, the blood vessels showed no staining for fascin. Interestingly, fascin immunoreactivity was confined to the aortic elastic membrane at 22 weeks of gestation (Figure 2B) but was negative in normal adult tissue.
Gastrointestinal System A very specific and restricted expression pattern of fascin was seen in the gastrointestinal tract throughout human developmental stages. Fascin protein was expressed in cells of the gastrointestinal tract at 6–8 weeks of gestation (Figures 2D and 2E), whereas the glandular epithelium and muscular layer were negative later in development (Figure 2C). Fascin protein was also detected in basal layer cells of the esophageal squamous epithelium. Liver tissue exhibited focal positivity in sinusoidal, endothelial, and Kupffer cells, whereas normal hepatocytes were negative (Figure 2F). In the pancreas, the acini and tubular epithelium of the glandular pancreatic tissue showed no immunolabeling.
Endocrine System
Fascin Expression in Other Tissues
The aim of this study was to determine expression of fascin in human embryo, fetus, and adult normal tissues and to show the differential expression among various developmental stages. We found that fascin was widely expressed in the developing nervous system, mesenchymal tissue, and gastrointestinal tract and not exhibited in the liver throughout human embryonic and fetal development, which was extremely similar to fascin transcripts during mouse development (De Arcangelis et al. 2004
Expression of fascin is highly tissue specific and cell specific throughout human development. In this study, we also found that normal simple columnar epithelia of the biliary duct, colon, ovary, pancreas, and stomach were all negative for fascin (Hashimoto et al. 2004 Interestingly, fascin expression was found to be time specific during human growth and development. Fascin immunoreactivity was positive in early embryo stages but negative both during later development and in adult tissue. For example, the Purkinje cells of the cerebellum and the medulla of the adrenal gland (a derivative of neural crest) exhibited strong fascin expression at 8–12 weeks of gestation, whereas the same tissues were negative later in development and in adult tissue. In addition, a pronounced expression pattern for fascin was detected throughout the gastrointestinal tract at early fetal stages, whereas the glandular epithelium and muscular layer were essentially negative in other stages. Although there is no mechanism to explain why fascin protein levels would be upregulated in many normal tissues, as observed at early developmental stages, it could be speculated that fascin mediates cell–cell interactions, cell division, and/or cell growth, because of the high demand for those processes during development.
Recently, several reports have shown that absence of fascin expression or low levels of expression in normal epithelia becomes dramatically altered in many human carcinomas. For example, upregulation of fascin is frequently observed in gastric carcinoma and colorectal carcinoma (Hashimoto et al. 2004 In conclusion, the immunohistochemical observations in this study are the first systematic demonstration of the immunoreactive presence of fascin in human embryonic, fetal, and normal adult tissues. Through analyses of the differential expression, it was discovered that fascin expression was highly tissue specific and time specific. It was also observed that fascin expression in cells of early developmental stages was similar to that seen in the malignant cells. Therefore, these results may imply that fascin plays an important role in the processes of embryogenesis and carcinogenesis.
This work was supported by grants from the National High Technology Research and Development Program of China (863 program, 2006AA02A403), the National Natural Science Foundation of China (30570849, 30672376, and 30772485), Specialized Research Fund for the Doctoral Program of Higher Education of China (20050560002 and 20050560003), and Guangdong Scientific Fund Key Items (37788, 5104541, and 7118419). We thank Professor X.J. Yu from the Department Forensic Medicine of Shantou University Medical College for providing autopsy specimens.
Received for publication September 9, 2007; accepted October 30, 2007
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