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Apoptosis Inhibition or Inflammation: The Role of Naip Protein Expression in Hodgkin and Non-Hodgkin Lymphomas Compared to Non-Neoplastic Lymph Node Publisher



Mazrouei S1, 6 ; Ziaei A1, 4 ; Tanhaee A4 ; Keyhanian K7 ; Esmaeili M3 ; Baradaran A2 ; Salehi M1, 5
Authors
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Authors Affiliations
  1. 1. Dept. of Genetics and Molecular Biology, Medical School, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. Dept. of Pathology, Medical School, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Dept. of Biomedical Engineering, Medical School, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Medical Student Research Center, Medical School, Isfahan University of Medical Sciences, Isfahan, Iran
  5. 5. Medical Genetics Center of Genome, Isfahan, No 208, Shariati St. (West), Iran
  6. 6. Faculty of Medicine, Friedrich Schiller University of Jena, Jena, Germany
  7. 7. Ottawa Hospital Research Institute, Ottawa, ON, Canada

Source: Journal of Inflammation Published:2012


Abstract

Background. Inhibitors of Apoptosis (IAP) family play a critical role in apoptosis and inflammatory response. Neuronal Apoptosis Inhibitory Protein (NAIP), as a member of both IAPs and NLR families (NOD-Like Receptor), is a unique IAP harboring NOD (Nucleotide Oligomerization Domain) and LLR (Leucine Rich Repeat) motifs. Considering these motifs in NAIP, it has been suggested that the main function of NAIP is distinct from other members of IAPs. As a member of NLR, NAIP mediates the assembly of 'Inflammasome' for inflammatory caspase activation. Pathologic expression of NAIP has been reported not only in some infectious and inflammatory diseases but also in some malignancies. However, there is no report to elucidate NAIP expression in lymphomatic malignancies. Methods. In this study, we examined NAIP protein expression in 101 Formalin-Fixed Paraffin-Embedded blocks including samples from 39 Hodgkin Lymphoma and 23 Non Hodgkin Lymphoma cases in comparison with 39 control samples (30 normal and 9 Reactive Lymphoid Hyperplasia (RLH) lymph nodes) using semi-quantitative immuno-flourecent Staining. Results. NAIP expression was not statistically different in lymphoma samples neither in HL nor in NHL cases comparing to normal samples. However, we evaluated NAIP expression in normal and RLH lymph nodes. Surprisingly, we have found a statistically significant-difference between the NAIP expression in RLH (M.R of NAIP/GAPDH expression = 0.6365 ± 0.017) and normal lymph node samples (M.R of NAIP/GAPDH expression = 0.5882 ± 0.047) (P < 0.01). Conclusions. These findings show that the regulation of apoptosis could not be the main function of NAIP in the cell, so the pathologic expression of NAIP is not involved in lymphoma. But, we concluded that the over expression of NAIP has more effective role in the inflammatory response. Also, this study clarifies the NAIP expression level in lymphoma which is required for IAPs profiling in order to be used in potential translational applications of IAPs. © 2012 Mazrouei et al; BioMed Central Ltd.
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