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Aseptic Bacterial Arthritis Dr Abdul-Hadi Abbass Abd SUMMARY Arthritic inflammation in man and animals can result from a great variety of causes, and the causative stimuli of many types of arthritis are unknown such as rheumatoid arthritis or imperfectly understood such as reactive arthritis associated with microbial infections. In conclusion: The sequence of events that is responsible for the inflammatory reactions observed in these experimental models has not been defined. The recommendations are continuing in these studies in regarding solve this chronic health problem. Dr Abdul-Hadi Abbass Abd التهـــاب المفاصاللجرثومي العقيم الدكتور عبدالهادي عباس عبد الخالصــــة ان التهاب المفاصل في االنسان والحيوان تكون نتيجة لعوامل واسباب عديدة والكثير من هذه االسباب والعوامل غير معروفة كما في الروماتيزم والتهاب المفاصل المتفاعل Reactive المرتبط باالصابات الجرثومية .ان فهم التهاب المفاصل وخصائص البكتريا التي تكون اساسا لدراسات تجريبية اللتهاب المفاصل المزمن قد توصلنا الى معرفة االسباب التي تؤدي الى التهاب المفاصل. لقد كانت دراسة وتحليل المشاهدات والتغيرات المصاحبة اللتهاب المفاصل الجرثومي المتفاعل على الحيوانات المختبرية لم تصل الى تكوين صورة واضحة عن السبب اللتهاب المفاصل لحد االن. ألهدف من هذه الدراسة هو لتوضيح ومعرفة الشواهد واالسباب التي تصاحب التفاعالت المرضي ة التي تسببها البكتريا في التهاب المفاصل .اضافة الى ذلك مالحظة النظام المناعي المتكون اثناء التهاب المفاصل للحيوانات المختبرية التجريبية المستعملة في دراسة هذه الظاهرة ودورها في تكوين المرض. Dr Abdul-Hadi Abbass Abd INTRODUCTION The term arthritis (acute and chronic form) refers to any inflammatory reaction occurring in a joint. Chronic arthritis is one of the most challenging of modern medical problems. Theoretically, chronic inflammation might occur from a continuous stimulus, which can result from the perpetual supply of antigen in the circulation or persisting antigen in the joints. It is known that arthritic syndromes can be caused by many mechanisms including various infections and types of trauma and in some cases the etiology is uncertain, as in rheumatoid arthritis (RA) in humans [1]. Types of Arthritis The clinical, pathological and serological features of Rheumatoid arthritis compared with other types of arthritis are shown in Table 1. 1. Rheumatoid arthritis. RA causes aches and pains in connective tissues near or around the joints for about one per cent of the adult population. RA is characterized by a constellation of histological changes. It is a broad spectrum of chronic destructive inflammatory disease involving synovial articulating joint [ 2]Many potential causative agents of RA have been proposed including viruses and persistent bacterial cell debris[ 3]. However, RA etiology is still undetermined. The clinical, pathological and serological features of RA compared with other Dr Abdul-Hadi Abbass Abd Table (1) . Comparison of Rhematoid arthritis with other types of arthritis Rheumatoid Adjuvant Collagen Streptococcal arthritis arthritis arthritis arthritis ClinicalFeatures Spontaneous Persistent or recurrent distribution Peripheral. Spinal Extra-articular Involvement Uveitis Nodules Genital lesions Sjŏgren's syndrome Pathological Features Mononuclear cell, Infiltrative synovitis PannusPeriostitis or bony ankylosis + + + - - - + Serologic Features Rheumatoid factor Anti-Type II collagen antibodies types of arthritis are showed in Table 1. The large joints such as knee, ankle, elbow, and wrist are involved [4]. If RA is severe, the fluid is transformed to thick, characteristic pus. The normal knee joint Figure 1 was comparing with the synovial displays patchy acute, nonspecific alterations, along with increased vascular permeability and infiltration by inflammatory cells, especially polymorphonuclear leukocytes. The histopathology of RA involves hypertrophy of the synovial lining surface and grossly, the synovial appears edematous, inflamed and protrudes into the joint space as slender villous projections[5]. 2. Infectious or septic arthritis. Septic arthritis is an infection in the joint (synovial) fluid and joint tissues. The infection usually reaches the joints though the bloodstream, although some joints Dr Abdul-Hadi Abbass Abd may become infected due to an injection, surgery, or injury. Different bacteria and viruses can infect a joint and usually are associated with a person's age. The following types of infectious organisms have been associated with septic arthritis. This type of arthritis is caused by microorganisms such as bacteria, Mycoplasmas, viruses. These microorganisms infect the joint directly [6]. β-hemolytic streptococci have been reported as causing between 3% and 30% of cases of human septic arthritis [7]. S. pyogenes and group G streptococci [8].were isolated from arthritic joints. Other bacteria are also isolated from rheumatic patients, such as Brucella[9], E. coli[10]. A number of investigators reported that Mycoplasma arthritidisinduced chronic relapse arthritis in rats, pigs, mice and turkeys. Viruses can cause disease in any of several ways, ranging from acute short- term infections to those that progress with age and last perhaps a life-time. 3. Non-infectious (aseptic or reactive) arthritis. Reactive arthritis is an acute, non-purulent arthropathy that develops as a result of an infection elsewhere in the patient. The variety of organisms associated with reactive arthritis is considerable, ranging from several Salmonella and Shigella species which cause enteric infection associated with arthritis [2], to Clostridium perfringens which is reported in higher numbers in colons of RA patients compared with normal colon. Some investigators found that Campylobacter jejune enteric infection correlated with reactive arthritis [11]. Arthritis may also be related to genital tract infections caused by other pathogens, such as Chlamydia and gonococci [12]. Intraperitoneal and intravenous injection of live Yersinia enterocolitica induced arthritis in Lewis rats[13]. An experimental mouse model of Yesinia infection was created to induce reactive arthritis [14]. Reactive arthritis generally does not require that the initiating organisms be viable and bacterial cell wall fragments have been used extensively in experimental model. The ability of a cellular component of S. pyogenes initiates and sustains a chronic inflammatory process. Other researcher’s induced chronic arthritis in rabbits with S. Dr Abdul-Hadi Abbass Abd pyogenes cell wall components inoculated intraarticularly [15]. The clinical, pathological and serological features of streptococcal arthritis compared with RA and other human and animal models of arthritis (Table 1). Reactive arthritis is associated with the persistence of bacterial antigen in the joint tissue after the symptoms have disappeared. The symptoms then reappear after a minor stimulus[16]. Histological changes in an acute exudative streptococcal arthritis in guinea pig and rat were followed by erosive synovitis with pannus formation and destruction of the margins of the articular cartilage and subchondral bone[17]. Streptococcal fragments have the ability to stimulate a number of immune responses that have not been precisely defined. Similarities exist between streptococcal arthritis and human RA: 1- The incidence of cell wall-induced disease is greater in females than males in Sprague-Dawley rats [18]. 2- Genetic factors play a key role in disease induction [19] 3- The disease is complementing dependent, and the immune cells of cell wall-treated rats are IL-2 deficient [20]. 4- Clinical disease is remittent and relapsing [21]. Study of the streptococcal fragments model of arthritis will be of interest in elucidating general mechanisms of arthritis that may be applicable in man. 4 4. Collagen arthritis. This type of arthritis is induced by injection of emulsified type II collagen with either incomplete or complete Freund's adjuvant [22], and is presumed to involve the generation of an autoreactive immune response against the joint. The latent period of collagen arthritis is 2 weeks after injection of collagen, after which the disease develops in 40% of rats [23]. The characteristics of collagen arthritis in animals are synovial hyperplasia, infiltration of the subsynovial tissue with inflammatory exudation of cells into the joint space, marginal erosion, periostitis, and destruction of the cartilage surface Dr Abdul-Hadi Abbass Abd [24]. The role of cellular and humoral immunity in collagen II-induced arthritis in rats was studied [25]. Collagen-induced arthritis was associated with the elevation of Urokinase and tissue-type Plasminogen Activator in animals but it was not related to lymphocyte proliferation reactivity. Collagen arthritis in an animal model was used to study the immunogenetic and pathogenetic aspects of development of autoimmune arthritis. This study was developed in two different ways: Firstly, T cells mediated activation of macrophages and fibroblasts in the joint leading to destructive delayed-type hypersensitivity, and secondly, formation of immune complexes in the joints, consisting of anti-collagen autoantibodies and rheumatoid factors [26]. Furthermore, the immune response to collagen may be regulated by genes closely associated with the major histocompatibility complex [27]. 5. Adjuvant arthritis. Adjuvant arthritis in the rat can be induced by a single injection of a dispersion of certain dried, heat-killed microorganisms such as Mycobacterium, Corynebacteria, Streptococci, or their cell wall components in a suitable oily vehicle. It is known that Nocardia and Corynebacterium rubrum [28],can replace Mycobacterium for adjuvant arthritis production. [29],have reported that cell walls from Streptomyces fradiae, S. lavenulae,L. plantarum and Staphylococcus aureus were able to produce adjuvant arthritis. The cell walls of S. aureus and streptococci showed that in water-in-oil emulsion were arthritogenic in female Lewis rats [30]. Following the injection of Freund's adjuvant consisting of whole heat-treated acid-fast bacilli, mineral oil and an emulsifying agent, arthritis is produced. This occurred without any added tissue homogenate or other bacteria. Following a latent period of 2 to 3 weeks arthritis and periarthritis develops which involves most of the joints and Dr Abdul-Hadi Abbass Abd extremities [2]. The clinical symptoms of adjuvant arthritis are redness, edema, deformity of limbs and tail[31]. Clinical, pathological and serological features compared with RA are listed in Table 1. Humoral and cellular immunity have been extensively studied in adjuvant polyarthritis [27]. Unlike RA, there is little or no increase in immunoglobulin synthesis by affected tissues, and rheumatoid factor is absent [32]. The major cellular components are rapidly proliferating cells, presumably macrophages, arising from the bone marrow and resembling those of a delayed hypersensitivity reaction. However, it is likely that the pathogenic cells are T lymphocytes, for two reasons. Firstly, treatment with anti-thymocyte serum or monoclonal anti-T cell antibodies in vivo hinders the development of adjuvant arthritis [33]. Secondly, arthritis has been passively transferred with concanavalin A (Con A) activated T cell blasts derived from rats with adjuvant arthritis[34], although it has not been possible to determine the specificity of these pathogenic T cells. However, Mycobacterium-reactive T cell clones have been isolated from rats immunized with Mycobacterium and one of these clones, the A2b clone, has been reported to induce arthritis in naive recipients and interestingly, to protect the rats from adjuvant arthritis[35],[36]reported that the epitope of mycobacterium) cell wall recognized by the A2b T cell clone was located on the 65kd heat shock protein. Dr Abdul-Hadi Abbass Abd Figure 1: Anatomy of Knee Joint Dr Abdul-Hadi Abbass Abd References [1] Jacobs C., D. Young, S. Tyler, G. Callis, S. Gillis, and P.J. Conlon. 1987. 111 vivo treatment with IL-1 reduces the severity and duration of antigeninduced arthritis in rats. J. Immunol. 141:2967-2974. [2] Bennett J.C. 1981. The etiology of rheumatoid arthritis in:W.N. Kelley, E.D. Harris, S. Ruddy, C.B. Sledge (ed.), Textbook of Rheumatology p. 887-895. W.B. Saunders, Philadelphia. [3] Pritchard D.G., R.L. Settine, and J.C. Bennett. 1980. 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K o g a . 1976. Structural requirements for arthritogenicity of peptidoglycans from Staphylococcus aureusand Lactobacillus plantarum and anologoussynthetic compounds. J. Immunol. 116:1635-1639. [31] Wood F.D., C.M. Pearson, and A. Tanaka. 1969. Capacity of mycobacterium wax D and its subfracticns to induce adjuvant arthrit is in rats. Int. Arch. Allergy Dr Abdul-Hadi Abbass Abd Appl. Immunol. 35:456-467. [32] Jasin H.E., T.D. Cooke, and E.R. Hurdet al.1973. Immunological models used for the study of rheumatoid arthritis. Fed. Proc. 32:147-152. [33] Larsson P., R. Holmdahl, L. Dencker, and L. Klareskog. 1989. I n v i v o t r e a t m e n t w i t h a n t i - C D 8 a n d a n t i - C D 5 monoclonal antibodies alters induced tolerance to adjuvant arthritis. J. Cell Biochem. 40:49-56. [34] Taurog J.D., G.P. Sandberg, and M.L. Mahowald. 1983. The cellular basis of adjuvant arthritis. Enhancement of cell mediated passive transfer by concanavalin A a n d b y i m m u n o s u p p r e s s i v e p r e t r e a t m e n t o f t h e recipient. Cell Immunol. 75:271-282. [35] Holoshitz J., A. Mattitau, and I.R. Cohen. 1984. Arthritis induced in rats by cloned T lymphocytes responsive to Mycobacterium but not to collagen type II. J. Clin. Invest. 73:211-215. [36] van der Zee R., W. van Eden, R.H. Meloen, A. Noordzij, and J.D.A. van Embden. 1989. Efficient mapping and characterization zation of a T cell epitope by simultaneous sythesis of multiple peptides. Eur. J. Immunol. 19:4347 [ 3 7 ] . U t s i n g e r P.D., N.J.Z v a i f l e r , and G.E.E r l i c h . 1985. R h e u m a t o i d Arthritis, Lippincott. Philadelphia, USA. Dr Abdul-Hadi Abbass Abd