Transforming growth factor-beta gene expression studies in nasal mucosal biopsies in naturally occurring allergic rhinitis. 2007

Rami J Salib
Allergy and Inflammation Research, Division of Infection, Inflammation and Repair, School of Medicine, Southampton General Hospital, Southampton, UK. rjs4@soton.ac.uk

BACKGROUND Evidence has been provided of enhanced epithelial transforming growth factor-beta (TGF-beta) immunoreactivity in allergic rhinitis, including correlation with intra-epithelial mast cell numbers, and the co-localisation of TGF-beta receptors to mast cells, suggesting that the epithelial expression of TGF-beta may represent an important biological process involved in either the recruitment or retention of mast cells within the epithelium in naturally occurring allergic rhinitis. METHODS In order to extend the above findings, evaluation was undertaken in whole nasal biopsies from subjects with naturally occurring allergic rhinitis, of levels of TGF-beta isotypes and receptors gene expression using real-time quantitative polymerase chain reaction (TaqMan RT-PCR), and the results compared to those for tumour necrosis factor-alpha (TNF-alpha), as a positive control. The study was also extended to evaluate gene expression for connective tissue growth factor (CTGF) and Smad proteins, as downstream markers of TGF-beta bioactivity, in the same populations. RESULTS There were no significant differences between the rhinitic and non-rhinitic groups in the expression of TGF-beta isoforms or Smad-3, Smad-6 and Smad-7 proteins; however, there was increased gene expression for TGF-betaRI and TGF-betaRII along with CTGF in seasonal allergic rhinitis. TNF-alpha gene expression was also increased in seasonal allergic rhinitis, consistent with a more acute inflammatory response in this form of rhinitis. CONCLUSIONS This study advances our understanding of the role of TGF-beta in the pathogenesis of the inflammatory response in allergic rhinitis.

UI MeSH Term Description Entries
D009297 Nasal Mucosa The mucous lining of the NASAL CAVITY, including lining of the nostril (vestibule) and the OLFACTORY MUCOSA. Nasal mucosa consists of ciliated cells, GOBLET CELLS, brush cells, small granule cells, basal cells (STEM CELLS) and glands containing both mucous and serous cells. Nasal Epithelium,Schneiderian Membrane,Epithelium, Nasal,Membrane, Schneiderian,Mucosa, Nasal
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001706 Biopsy Removal and pathologic examination of specimens from the living body. Biopsies
D012221 Rhinitis, Allergic, Perennial Inflammation of the mucous membrane of the nose similar to that found in hay fever except that symptoms persist throughout the year. The causes are usually air-borne allergens, particularly dusts, feathers, molds, animal fur, etc. Rhinitis, Allergic, Nonseasonal
D012313 RNA A polynucleotide consisting essentially of chains with a repeating backbone of phosphate and ribose units to which nitrogenous bases are attached. RNA is unique among biological macromolecules in that it can encode genetic information, serve as an abundant structural component of cells, and also possesses catalytic activity. (Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed) RNA, Non-Polyadenylated,Ribonucleic Acid,Gene Products, RNA,Non-Polyadenylated RNA,Acid, Ribonucleic,Non Polyadenylated RNA,RNA Gene Products,RNA, Non Polyadenylated
D014409 Tumor Necrosis Factor-alpha Serum glycoprotein produced by activated MACROPHAGES and other mammalian MONONUCLEAR LEUKOCYTES. It has necrotizing activity against tumor cell lines and increases ability to reject tumor transplants. Also known as TNF-alpha, it is only 30% homologous to TNF-beta (LYMPHOTOXIN), but they share TNF RECEPTORS. Cachectin,TNF-alpha,Tumor Necrosis Factor Ligand Superfamily Member 2,Cachectin-Tumor Necrosis Factor,TNF Superfamily, Member 2,TNFalpha,Tumor Necrosis Factor,Cachectin Tumor Necrosis Factor,Tumor Necrosis Factor alpha
D015870 Gene Expression The phenotypic manifestation of a gene or genes by the processes of GENETIC TRANSCRIPTION and GENETIC TRANSLATION. Expression, Gene,Expressions, Gene,Gene Expressions
D015894 Genome, Human The complete genetic complement contained in the DNA of a set of CHROMOSOMES in a HUMAN. The length of the human genome is about 3 billion base pairs. Human Genome,Genomes, Human,Human Genomes
D016212 Transforming Growth Factor beta A factor synthesized in a wide variety of tissues. It acts synergistically with TGF-alpha in inducing phenotypic transformation and can also act as a negative autocrine growth factor. TGF-beta has a potential role in embryonal development, cellular differentiation, hormone secretion, and immune function. TGF-beta is found mostly as homodimer forms of separate gene products TGF-beta1, TGF-beta2 or TGF-beta3. Heterodimers composed of TGF-beta1 and 2 (TGF-beta1.2) or of TGF-beta2 and 3 (TGF-beta2.3) have been isolated. The TGF-beta proteins are synthesized as precursor proteins. Bone-Derived Transforming Growth Factor,Platelet Transforming Growth Factor,TGF-beta,Milk Growth Factor,TGFbeta,Bone Derived Transforming Growth Factor,Factor, Milk Growth,Growth Factor, Milk
D055513 Connective Tissue Growth Factor A CCN protein family member that regulates a variety of extracellular functions including CELL ADHESION; CELL MIGRATION; and EXTRACELLULAR MATRIX synthesis. It is found in hypertrophic CHONDROCYTES where it may play a role in CHONDROGENESIS and endochondral ossification. CCN2 Protein,Hypertrophic Chondrocyte-Specific Protein 24,IGF-Binding Protein-Related Protein-2,IGFBP-8,IGFBP-rP2,Insulin-Like Growth Factor Binding Protein 8,Hypertrophic Chondrocyte Specific Protein 24,IGF Binding Protein Related Protein 2,Insulin Like Growth Factor Binding Protein 8

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