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Kidney Int. 2003 Jun;63(6):2242-53.
A novel HIV-1 transgenic rat model of childhood HIV-1-associated nephropathy.

Ray PE, Liu XH, Robinson LR, Reid W, Xu L, Owens JW, Jones OD, Denaro F, Davis HG, Bryant JL.

Children's Research Institute, Center for Genetic Medicine, Children's National Medical Center, Washington, D.C. 20010, USA. Pranmc.org

BACKGROUND: A characteristic finding of human immunodeficiency virus (HIV)-associated nephropathy (HIVAN) is the presence of heavy proteinuria, focal or global glomerulosclerosis, and microcystic tubular dilatation leading to renal enlargement, and rapid progression to end-stage renal disease (ESRD). METHODS: We have recently developed the first HIV-1 transgenic rat model that carry a noninfectious HIV-1 DNA construct lacking 3.1 kb of sequence overlapping the gag and pol sequences, and develop many of the clinical lesions seen in HIV-infected patients, including HIVAN. To gain further insight into the pathogenesis of childhood HIVAN, we followed the clinical and renal pathologic outcome of 165 HIV-1 transgenic (HIV-Tg) rats and their respective control littermates for a period of 18 months. RESULTS: HIV-1 Tg rats progressively developed proteinuria and renal histologic lesions similar to those seen in children with HIVAN, leading to chronic renal failure. By in situ hybridization, HIV-1 genes were detected in glomerular and tubular epithelial cells and infiltrating mononuclear cells, which also expressed the HIV-1 envelop protein gp120. The development of HIVAN was associated with the accumulation of basic fibroblast growth factor (bFGF) in the kidney. CONCLUSION: These data support the notion that HIV-1 plays a direct role in the pathogenesis of HIVAN, by affecting the function and growth of renal epithelial cells, inducing the recruitment of mononuclear cells, and accumulating bFGF in the kidney, even in the absence of viral replication. These rats may provide an excellent model system to study the pathogenesis of childhood HIVAN.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12753314&dopt=Abstract [PubMed - in process]

Kidney Int. 2003 Jun;63(6):2286-94.
Incidence of latent mesangial IgA deposition in renal allograft donors in Japan.

Suzuki K, Honda K, Tanabe K, Toma H, Nihei H, Yamaguchi Y.

Department of Medicine and Department of Urology, Kidney Center, Tokyo, Japan; Department of Pathology, Tokyo Women's Medical University, Tokyo, Japan; and Department of Pathology, Kashiwa Hospital, Jikei University, Chiba, Japan.

Incidence of latent mesangial IgA deposition in renal allograft donors in Japan. BACKGROUND: Mesangial immunoglobulin A (IgA) deposition is incidentally encountered in asymptomatic individuals, but its precise frequency and significance had not been clarified. The background of the latent IgA deposition is related to the epidemiology and pathogenesis of IgA nephropathy. METHODS: Zero-hour allograft biopsies were performed in 510 renal transplantations (446 living donors, and 64 cadaveric donors) at the Kidney Center of Tokyo Women's Medical University. Mesangial IgA and C3 deposition were analyzed immunohistochemically, and the frequency and clinicopathologic features of mesangial IgA deposition were investigated. RESULTS: Mesangial IgA deposition was present in 82 (16.1%) of the total 510 allografts with no statistical difference between living donors (72/446, 16.1%) and cadaveric donors (10/64, 15.6%) or between blood-related donors (66/392, 16.8%) and nonblood-related donors (16/110, 14.5%). Mesangial C3 deposition was present in 16 (19.5%) of the 82 allografts with mesangial IgA deposition. The grade of hematuria in IgA(+) donors was significantly higher than IgA(-) donors (1.30 +/- 1.17 vs. 0.86 +/- 0.89, P = 0.025). Histologic investigation of IgA(+) allografts revealed the frequency of mesangioproliferative glomerulonephritis (PGN) was significantly higher in IgA(+)/C3(+) allografts (8/16, 50%) than in IgA(+)/C3(-) allografts (11/66, 16.7%) (P = 0.0084). Moreover, the number of infiltrated macrophages to glomerulus (cells/glomerular cross section) was significantly higher in the IgA(+)/C3(+) allografts than in IgA(+)/C3(-), IgA(-)/C3(+) and IgA(-)/C3(-) allografts (1.10 +/- 0.62 vs. 0.61 +/- 0.42, P = 0.0008; 0.47 +/- 0.34, P = 0.023; and 0.37 +/- 0.23, P = 0.002, respectively). CONCLUSION: The latent mesangial IgA deposition was a relatively common phenomenon in the healthy Japanese donors. This phenomenon was associated with mild degree of microhematuria, mesangial proliferation and glomerular macrophage infiltration in some of the affected individuals, especially with combined IgA and C3 deposition.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12753320&dopt=Abstract [PubMed - in process]

J Periodontal Res. 2003 Jun;38(3):247-54.
Interleukin-1beta, clinical parameters and matched cellular-histopathologic changes of biopsied gingival tissue from periodontitis patients.

Hou LT, Liu CM, Liu BY, Lin SJ, Liao CS, Rossomando EF.

Department of Periodontology, College of Medicine, National Taiwan University Hospital, Taiwan. lthoa.mc.ntu.edu.tw

OBJECTIVE: The aim of the present study was to investigate whether interleukin (IL)-1beta in diseased tissues adjacent to periodontal pockets can reflect the degree of inflammation and destruction of these tissues pathologically. BACKGROUND: IL-1beta-dependent mechanisms have been strongly implicated in contributing to inflammation and destruction of bone and attachment loss, which are characteristic features of periodontal disease. This biochemical mediator released during pro-inflammatory processes has not been objectively integrated with clinical and histopathologic features of periodontal disease. METHODS: Periodontitis-affected inflamed tissue and clinically nonaffected healthy gingivae were harvested from 14 periodontal patients, respectively. The severity of tissue inflammation was illustrated by clinical parameters and cellular histologic changes and quantified by histometric assessments. IL-1beta in these extracted specimens was measured with an enzyme-linked immunosorbent assay (ELISA) technique. Pathogenic roles that IL-1beta plays in gingival inflammation and pathologic tissue changes in tissue sections were analyzed statistically. RESULTS: The overall total tissue IL-1beta, tissue concentration of IL-1beta, and percentage of inflammatory cell infiltration (PICI) determined from diseased gingivae were obviously higher than those of controls from both healthy sites of periodontitis and non-periodontitis subjects. With increasing gingival index (GI), plaque index (PlI), and probing depth (PD), there was a marked elevation in total tissue IL-1beta. Total tissue IL-1beta was significantly correlated with GI, PlI, the PICI, and tissue alterations. Polymorphonuclear leukocytes (PMNs) and monocyte-macrophage cells seemed to predominate in heavily infiltrated areas of diseased gingiva. These cell types were confirmed by immunocytochemical localization with either monoclonal mouse antihuman neutrophil elastase antibody or monoclonal mouse antihuman macrophage (CD68) antibody, respectively. Total tissue IL-1beta and the PICI were also elevated in diseased gingivae near deeper PD, while neither total IL-1beta nor tissue concentration was statistically correlated with PD. Thus, correlation analysis indicates that IL-1beta level in inflamed periodontal tissues correlates highly with clinical parameters (GI and PlI) and PICI (the degree of inflammation). CONCLUSIONS: These observations suggest that IL-1beta plays a significant role in the pathogenic mechanisms of periodontal tissue destruction, and that measurement of tissue IL-1beta would be a valuable aid and useful for diagnostic markers of periodontal diseases.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12753361&dopt=Abstract

J Periodontal Res. 2003 Jun;38(3):262-8.
Generation of gingival T cell lines/clones specific with Porphyromonas gingivalis pulsed dendritic cells from periodontitis patients.

Aroonrerk N, Pichyangkul S, Yongvanitchit K, Wisetchang M, Sa-Ard-Iam N, Sirisinha S, Mahanonda R.

Department of Microbiology, Faculty of Science, Mahidol University, Bangkok, Thailand.

OBJECTIVES AND BACKGROUND: It is well documented that in periodontitis lesions, most infiltrated gingival T cells are antigen-specific memory T cells. These cells play an important role as regulators and effector cells in the pathogenesis of periodontitis. In this study, we used dendritic cells (DCs) as antigen-presenting cells to generate human gingival T cell lines and clones specific for Porphyromonas gingivalis from periodontitis patients. METHODS: Autologous DCs were derived from the patients' adherent monocytes using granulocyte-macrophage colony-stimulating factor and interleukin (IL)-4. Lymphocytes were isolated from gingival biopsies using collagenase enzyme digestion and the number was increased by subsequent culturing in IL-2-containing medium. T cells were then negatively sorted using flow cytometry, cocultured with P. gingivalis-pulsed DCs and subsequently expanded in the culture medium containing IL-2. T cells were kept viable and active by periodic exposure to antigen-pulsed DCs. The specificity of the T cell lines was tested against four plaque bacteria: P. gingivalis, Actinobacillus actinomycetemcomitans, Prevotella intermedia and Actinomyces viscosus. The established T cell lines were then cloned. Three P. gingivalis-specific T cell lines and 12 gingival T cell clones were generated. They all showed good specificity against P. gingivalis but not to other plaque bacteria. RESULTS: All T cell clones were positive for CD4 and the majority of them produced interferon gamma, but a minimal or negligible amount of IL-5. CONCLUSIONS: The data obtained clearly showed that monocyte-derived DCs could be used as powerful antigen-presenting cells to generate antigen-specific T cells from periodontitis tissues.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12753363&dopt=Abstract

J Periodontal Res. 2003 Jun;38(3):282-9.
Inhibitory effect of procyanidin oligomer from elm cortex on the matrix metalloproteinases and proteases of periodontopathogens.

Song SE, Choi BK, Kim SN, Yoo YJ, Kim MM, Park SK, Roh SS, Kim CK.

Department of Periodontology, College of Dentistry, Yonsei University, Seoul, Korea.

OBJECTIVES: The purpose of this study was to evaluate a partially purified extract (elm extract) from the Ulmi cortex (Ulmi macrocarpa Hance) and its active ingredient, a mix of procyanidin oligomers (3 to 12 flavan-3-ol monomers, an average molecular weight of 1,518 with an average polymerization degree of 5.3) for a possible inhibitory effect against proteases. BACKGROUND: Host-derived matrix metalloproteinases (MMPs) and bacterial proteases play important roles in the gingival tissue destruction that is a characteristic of periodontitis. The inhibitors of these proteases may be developed into therapeutic agents against periodontitis. METHODS: The inhibitory effects were assessed by gelatin zymography. The MMPs tested were originated from the gingival crevicular fluid (GCF) of adult periodontitis patients and from the conditioned media of cultured periodontal ligament (PDL) cells, which provided the proMMP-2 and activated MMP-2 when treated with a periodontopathogen, Treponema lecithinolyticum. Bacterial enzymes tested were secreted forms from two major periodontopathogens, Porphyromonas gingivalis and Treponema denticola. In addition, the inhibitory effects on trypsin-like enzymes from these two periodontopathogens were assayed by the n-benzoyl-DL-arginine-naphthylamide (BANA) test. RESULTS: The elm extract and the procyanidin oligomer (100-1,000 microg/ml) exhibited potent inhibitory effects on the MMPs in GCF (chiefly MMP-8 and MMP-9), the pro and active forms of MMP-2, and secreted and trypsin-like enzymes from T. denticola and P. gingivalis. CONCLUSIONS: These results suggest that elm cortex should be considered as a potential agent against periodontal diseases, due to its inhibitory action on MMPs and the proteases of periodontopathogens.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12753366&dopt=Abstract

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