Inflammatory bowel disease and lymphoproliferative disorders: the dust is starting to settle.

Gut. 2009 Oct; 58(10): 1427-36
Sokol H, Beaugerie L

The venture of lymphoproliferative disorders (LDs) has become a major anxiety for clinicians managing patients with inflammatory viscus disease (IBD). Yet it is difficult to characterize the doable domain of immunosuppressive therapy from the background venture cod to the inflammatory disorder itself. LDs are clonal B or T radiophone proliferation display considerable nonuniformity and the incidence has accumulated since the 1970s. The strongest and best-established venture factors for LDs are direct and acquired immunodeficiency (HIV, immunosuppressant), notably via defective insusceptible surveillance of Epstein-Barr virus. In some auto-immune diseases (eg, Sjögren's syndrome), inflammatory diseases (eg, rheumatoid arthritis) or habitual suppuration (chronic pyothorax), the venture of LD is increased. In IBD patients, in general, the venture of LD seems to be kindred to or very slightly higher than in the generalized population. The role of immunosuppressants in lymphomagenesis is difficult to individualise because another factors potentially participating are inter-linked. Concordant data declare that thiopurine therapy is associated with a moderately accumulated venture of LD. Data regarding immunosuppressant are tight and become from diseases another than IBD but the venture seems low. Data regarding venture of LD in IBD patients receiving anti-tumour necrosis bourgeois alpha (TNFalpha) agents are insufficient at this time, mainly because most of the patients are co-treated with thiopurines. The recently individualised risks of hepatosplenic T radiophone lymphoma and fatal post-mononucleosis LD, in young phallic patients with IBD who are co-treated with anti-TNFalpha and thiopurines, and EBV-seronegative IBD males, respectively, are belike low but remain to be better quantified.

Reversible Methotrexate-Associated Lymphoproliferative Disorder Resembling Advanced Gastric Cancer in a Patient With Rheumatoid Arthritis.

Am J Med Sci. 2009 Sep 9;
Satoh K, Yoshida N, Imaizumi K, Yajima M, Wakui H, Sawada KI, Komatsuda A

A 73-year-old woman with rheumatoid arthritis had been aerated with weekly low-dose methotrexate (MTX) for 5 years. She suffered from epigastric discomfort. Endoscopic communicating revealed a growth resembling advanced viscus cancer. Biopsy specimens showed abnormal lymphoid cell infiltration. Immunohistological studies showed that these cells were positive for CD30 and CD79a, but not for CD15 or CD20. In situ hybridization identified Epstein-Barr virus latency-associated polymer expression in these cells. Clonally rearranged immunoglobulin onerous concern JH factor was not detected by Southern smirch analysis. She was diagnosed with Epstein-Barr virus-associated polymorphic lymphoproliferative disorder (LPD) due to immunodeficiency caused by MTX administration. Cessation of MTX therapy led to complete regression of the tumor. To our knowledge, this is the first case of unprompted remission of MTX-associated viscus LPD after conclusion of MTX therapy. Increased awareness is necessary on the possible occurrence of LPD resembling viscus cancer in rheumatoid arthritis patients aerated with MTX.

Pathogenic CD8(+) T cells in multiple sclerosis.

Ann Neurol. 2009 May 11; 66(2): 132-141
Friese MA, Fugger L

Traditionally, autoimmune pathogeneses hit been attributed to CD4(+) T lymphocytes, as in multiple induration (MS), rheumatoid arthritis, identify 1 diabetes mellitus, and/or to B lymphocytes, as in myasthenia gravis and systemic lupus erythematosus. That is because their primary transmitted associations are mostly with certain human leukocyte antigen collection II alleles, whose gene products inform antigens to CD4(+) T cells. Because few autoimmune diseases show stronger associations with major histocompatibility Byzantine collection I alleles (ankylosing spondylitis, Behçet's disease, and psoriasis), CD8(+) T cells, which interact with major histocompatibility Byzantine collection I molecules, hit been largely unnoticed in autoimmunity research. However, a difference of findings has fresh alive interest in this population, particularly in MS. First, it shows associations with major histocompatibility Byzantine collection I alleles. Second, its lesions show a predominance of CD8(+) T cells. Third, these represent effectors that can direct damage central troubled system direct cells. Furthermore, several clinical trials of monoclonal antibodies specifically against CD4(+) T cells, or the polarizing cytokines on which they depend, hit failed to show any therapeutic benefit in MS, unlike broader-spectrum antibodies that deplete every T cells. Here, we analyse the grounds that CD8(+) T cells endeavor a persona in MS pathogenesis. Ann Neurol 2009;66:132-141.

Effect of the human leukocyte antigen HLA-DRB1 and anti-cyclic citrullinated peptide on the outcome of rheumatoid arthritis patients.

Braz J Med Biol Res. 2009 Sep; 42(9): 831-8
Farouk HM, Mansour HE, Rahman SA, Mostafa AA, Shamy HA, Zarouk WA

Our objective was to watch whether the proximity of the human leukocyte antigen HLA-DRB1 locus is related with production of anti-cyclic citrullinated peptide antibodies (anti-CCP Abs) and to what extent they are related with accumulated status to and severity of rheumatoid arthritis (RA) in Afrasian patients. Twenty-nine RA patients gave conversant consent to participate in a case-control think that was approved by the Ain Shams University Medical Ethics Committee. RA disease activity and severity were observed using the simplified disease activity index and Larsen scores, respectively. We used a wide bit domestic think on the ornament of HLA typewriting in normal Egyptians as a control study. Anti-CCP Abs and HLA-DRB1 typewriting were observed for every subjects. The alleles most strongly related with RA were HLA-DRB1 [*01 , *04 and *06] (41.4%). RA patients with humour anti-CCP Ab titers above 60 U/mL had a significantly higher frequency of HLA-DRB1*01 (58.3%) and HLA-DRB1*04 alleles (83.3%). Significant constructive correlations were institute between humour and synovial anti-CCP Ab titer, RA disease activity, and severity (r = 0.87, 0.66 and 0.63, respectively; P < 0.05). HLA-DRB1 SE+ alleles [*01 and *04] were highly expressed among Afrasian RA patients. The proximity of these alleles was related with higher anti-CCP Ab titer, astir and nonindulgent RA disease. Early selection of HLA-DRB1 SE+ alleles and humour anti-CCP Ab could assist the prevision of the clinical instruction and forecasting of RA when prototypal evaluated leading to meliorate disease control.

Protein arginine deiminase 4 (PAD4): Current understanding and future therapeutic potential.

Curr Opin Drug Discov Devel. 2009 Sep; 12(5): 616-27
Jones JE, Causey CP, Knuckley B, Slack-Noyes JL, Thompson PR

The protein arginine deiminases (PADs), and in particular PAD4, hit emerged as possibleness therapeutic targets for the communication of rheumatoid arthritis (RA). In this review, grounds linking dysregulated PAD activity to the onset and advancement of RA is presented, and the possibleness role of such abnormal activity in another human diseases, such as binary induration and cancer, is discussed. The famous physiological roles of the PADs, particularly PAD4, and current knowledge regarding PAD structure, catalysis and inhibition are also described.

Paraneoplastic arthritis may mimic rheumatoid arthritis with symmetrical and upper extremity predilecting presentation.

J Clin Rheumatol. 2009 Sep; 15(6): 319-20
Bahat G, Kamali S, Saka B, Erten N, Karan MA, Tascioglu C

Role of PGE2 and EP receptors in the pathogenesis of rheumatoid arthritis and as a novel therapeutic strategy.

Endocrine, metabolic &#38; insusceptible disorders drug targets, Vol. 6, No. 4. (December 2006), pp. 383-394.

Recent progress in discernment the pathogenesis of rheumatoid arthritis (RA) in nonconvergent with interpretation of the functional persona of the prostaglandin receptor subfamily has revealed an important regulatory persona of PGE2, in addition to its well-known unhealthy persona in the advancement of RA. Characteristic features of RA are synovial proliferation and pannus formation, which termination in the conclusion of cartilage and bone. Pannus paper is mainly imperturbable of macrophages and fibroblast-like synoviocytes. Both T cell-derived IL-17 and macrophage-derived TNF-alpha seem to endeavor a bicentric persona in the advancement of unhealthy cascades in RA. PGE2 is also produced in salutation to unhealthy cytokines, which in turn negatively regulates both IL-17 and TNF-alpha countenance and TNF/IL-1-induced activation of fibroblast-like synoviocytes finished EP2/EP4 receptors, resulting in the inflection of unhealthy cascades. IL-17- and TNF-activated macrophages differentiate into osteoclasts in the presence of M-CSF and RANKL expressed by fibroblast-like synoviocytes. PGE2 binding to EP4 stimulates osteoclastogenesis finished enhancing RANKL expression. At the same time, PGE2 suppresses osteoclastogenesis by inhibiting M-CSF countenance of fibroblast-like synoviocytes as substantially as both IL-17 and IL-17-induced TNF-alpha countenance of macrophages. PGE2-EP4 also activates osteoblastogenesis finished increasing cbfa1 and osterix, two essential transcription factors required for pearl formation. The gain effect of PGE2 haw candid toward bushel of wearing pearl finished the quelling of rousing and improvement of pearl remodeling. Here, we handle a diverse state of PGE2/EP receptors and their important regulatory roles in the pathogenesis of RA, which haw lead to a new therapeutic strategy.
J Akaogi, T Nozaki, M Satoh, H Yamada