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Genes Immun. 2002 Sep;3(6):345-9.
A genotypic association implicates myeloperoxidase in the progression of hepatic fibrosis in chronic hepatitis C virus infection.
Reynolds WF, Patel K, Pianko S, Blatt LM, Nicholas JJ, McHutchison JG.
Sidney Kimmel Cancer Center, San Diego, CA 92121, USA. wreynoldkcc.org
The hepatitis C virus (HCV) is a major cause of liver disease and the complications of cirrhosis. Liver biopsies, performed prior to the development of liver cirrhosis, characteristically show an inflammatory cell infiltrate with varying degrees of fibrosis. Precisely how HCV infection induces hepatic fibrogenesis is unknown. Recent studies suggest the release of oxidants, cytokines and proteases from the host immune system are key to the development of fibrosis. Macrophages and neutrophils, cells heavily represented in the inflammatory cell response, contain the oxidant generating enzyme myeloperoxidase (MPO). Cellular levels of MPO can be influenced by a functional promotor polymorphism, -463G/A, which precedes the MPO gene. We examined the relationship between this MPO promotor genotype and the degree of fibrosis in 166 patients with chronic HCV infection. All patients had previously participated in clinical drug trials for the treatment of chronic HCV infection. The MPO genotype was determined from cryo-preserved lymphocytes obtained from patients prior to treatment. The degree of fibrosis was estimated from liver biopsy specimens obtained prior to treatment. We found that patients with the MPO GA/AA genotype were more likely to have advanced fibrosis scores compared with those with the GG genotype: Of the patients with GG genotype, 78% (79 of 102 cases) had lower Knodell Fibrosis scores of 0 or 1, compared to 56% (37 of 64 cases) of patients with GA/AA genotype (P < 0.05). The mechanism(s) by which MPO contributes to fibrosis progression remains to be determined.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12209361&dopt=Abstract
Cancer. 2002 Sep 1;95(5):1076-84.
High prevalence of endocrine dysfunction in long-term survivors after allogeneic bone marrow transplantation for hematologic diseases.
Tauchmanova L, Selleri C, Rosa GD, Pagano L, Orio F, Lombardi G, Rotoli B, Colao A.
Department of Molecular and Clinical Endocrinology and Oncology, Federico II University, Naples, Italy.
BACKGROUND: The progressively increasing number of long-term survivors after allogeneic bone marrow transplantation (allo-BMT) led researchers to focus on the early and late complications of this procedure. Endocrine dysfunction occurred mostly in patients who had undergone total body irradiation (TBI) as part of pretransplantation treatment. The extent to which chemotherapy and immune system derangement affect endocrine function in allo-BMT recipients is still unclear. METHODS: Forty consecutive patients (21 women, 19 men) with hematologic diseases surviving 12 or more months after allo-BMT from HLA-identical siblings were studied. Patients' age at transplantation ranged from 13 to 45 years and their post-BMT follow-up lasted 12-62 months. The conditioning regimen BUCY2 was employed. Graft versus host disease (GVHD) was observed in the acute form in 13 patients and in the chronic form in 26. The function of hypothalamic-pituitary-gonad, thyroid, somatotrophic, and adrenal axes was assessed. RESULTS: The most common endocrine dysfunction was ovarian insufficiency (95% of women), followed by an increase in follicle-stimulating hormone in 47% of men, indicating spermatogenesis damage. Hormone replacement therapy was contraindicated in three women because of chronic liver GVHD and it was ineffective partially in four others because of reduced intestinal or cutaneous absorption. Thyroid dysfunction occurred in 47.5% of patients and included low T3 syndrome, chronic thyroiditis, and transient subclinical hyperthyroidism and subclinical hypothyroidism. Adrenal function was abnormal in 10%, mostly related to the prolonged corticosteroid treatment. IGF-I was lower than age-reference values in 27% of all patients and in 38% of those with chronic GVHD. Thyroid, adrenal, and IGF-I impairments were more frequent in patients with chronic GVHD than in patients without this disease (P = 0.048). CONCLUSIONS: A high prevalence of endocrine dysfunction was detected in a cohort of allo-BMT recipients not treated by TBI. Although gonadal failure was likely related to intensive myeloablative treatments, thyroid, adrenal, and IGF-I impairments were late events, suggesting that immunosuppressive treatment and immune system derangement may play a role in the development of endocrine dysfunction after allografting. 2002 American Cancer Society.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12209694&dopt=Abstract
J Biomed Mater Res. 2002 Dec 5;62(3):372-7.
Optimization of monomethoxy-polyethylene glycol grafting on the pancreatic islet capsules.
Lee DY, Yang K, Lee S, Chae SY, Kim KW, Lee MK, Han DJ, Byun Y.
Department of Materials Science and Engineering, Kwangju Institute of Science and Technology, 1 Oryong-dong, Puk-gu, Gwangju 500-712, Korea.
As a new approach to islet transplantation, biocompatible monomethoxy-poly(ethylene glycol) (mPEG) was chemically grafted onto the pancreatic islet capsule. The aim of this study was to determine the optimal conditions for completely covering the islet by the mPEG while maintaining a high viability of islets according to the reaction time and the repeating number of the reaction. By grafting the fluorescein-PEG instead of mPEG, we determined the optimal mPEG grafting time as 1 h, during which time the procedure did not reduce islet viability. Insulin secretion from islets where the mPEG was grafted on for 3 times was similar to that of control islets. Moreover, the mPEG-grafted islets rapidly responded to the changes in the glucose concentration in the same pattern as did control islets. These results showed that mPEG grafting did not damage the function of islets. In conclusion, when the mPEG grafting was performed for 1 h and repeated twice with 1-day culture between each mPEG-grafting step, the mPEG completely covered the islet capsules without any damage to the viability and function of the islets. The main advantage of mPEG grafting on the islet capsule is that it can protect the islet against the host's immune system without increasing the islet size so that it can be administered into the portal vein by the catheter. 2002 Wiley Periodicals, Inc.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12209922&dopt=Abstract
Int J Cancer. 2002 Sep 10;101(2):151-5.
Indoleamine 2,3-dioxygenase contributes to tumor cell evasion of T cell-mediated rejection.
Friberg M, Jennings R, Alsarraj M, Dessureault S, Cantor A, Extermann M, Mellor AL, Munn DH, Antonia SJ.
Department of Interdisciplinary Oncology, H. Lee Moffitt Cancer Center, Tampa, FL 33612, USA.
The priming of an appropriate anti-tumor T cell response rarely results in the rejection of established tumors. The characteristics of tumors that allow them to evade a T cell-mediated rejection are unknown for many tumors. We report on evidence that the expression of the immunosuppressive enzyme, indoleamine 2,3-dioxygenase (IDO) by mononuclear cells that invade tumors and tumor-draining lymph nodes, is 1 mechanism that may account for this observation. Lewis lung carcinoma (LLC) cells stimulated a more robust allogeneic T cell response in vitro in the presence of a competitive inhibitor of IDO, 1-methyl tryptophan. When administered in vivo this inhibitor also resulted in delayed LLC tumor growth in syngeneic mice. Our study provides evidence for a novel mechanism whereby tumors evade rejection by the immune system, and suggests the possibility that inhibiting IDO may be developed as an anti-cancer immunotherapeutic strategy. 2002 Wiley-Liss, Inc.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12209992&dopt=Abstract
Parasitology. 2002 Aug;125(Pt 2):93-8.
Reduced efficacy of the immune melanization response in mosquitoes infected by malaria parasites.
Boete C, Paul RE, Koella JC.
Laboratoire de Parasitologie Evolutive, CNRS UMR 7103, Universite P. & M. Curie, Paris, France. cboetnv.jussieu.fr
Although the mosquito vectors of malaria have an effective immune system capable of encapsulating many foreign particles, they rarely encapsulate malaria parasites in natural populations. A possible reason for this apparent paradox is that infection by malaria reduces the capability of the mosquito to mount an effective immune response. To investigate this possibility, we blood-fed Aedes aegypti mosquitoes on an uninfected chicken or on one infected with Plasmodium gallinaceum, and compared the proportions of the infected and uninfected mosquitoes that melanized a negatively charged Sephadex bead injected into the thorax 1, 2 and 4 days after blood-feeding. About 40% of the uninfected mosquitoes, but less than 25% of the infected ones, melanized the bead. The difference between infected and uninfected mosquitoes was most obvious 1 day after infection (at the parasite's ookinete stage), while the difference diminished during the early oocyst stage (2 days after infection) and disappeared at the later oocyst stage (4 days after infection). These results suggest that the parasite can either actively suppress its vector's immune response or that it modifies the blood of its chicken host in away that reduces the efficacy of the mosquito's immune system. In either case, the reduction of immunocompetence can have important consequences for malaria control, in particular for the current effort being invested into the genetic manipulation of mosquitoes.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12211612&dopt=Abstract
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