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Pathogen research abs 1 || Pathogen research abs 2 || Pathogen research abs 3 || Pathogen research abs 4 || Pathogen research abs 5 || Hormone and endocrine research abs 1 || Hormone and endocrine research abs 2 || Hormone and endocrine research abs 3 || Hormone and endocrine research abs 4 || Hormone and endocrine research abs 5 || Follicle and follicular cells research abs 1 || Interferon research abs 1





Proc Natl Acad Sci U S A. 2001 Jan 30;98(3):1212-7.
Prolonging the half-life of human interferon-alpha 2 in circulation: Design, preparation, and analysis of (2-sulfo-9-fluorenylmethoxycarbonyl)7- interferon-alpha 2.

Shechter Y, Preciado-Patt L, Schreiber G, Fridkin M.

Departments of Biological Chemistry and Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel. yoram.shechteeizmann.ac.il

Polypeptide drugs are generally short-lived species in circulation. In this study, we have covalently linked seven moieties of 2-sulfo-9-fluorenylmethoxycarbonyl (FMS) to the amino groups of human interferon-alpha2. The derivative thus obtained (FMS(7)-IFN-alpha2) has approximately 4% the biological potency and 33 +/- 4% the receptor binding capacity of the native cytokine. Upon incubation, FMS(7)-IFN-alpha2 undergoes time-dependent spontaneous hydrolysis, generating active interferon with t(1/2) values of 24 +/- 2 h at pH 8.5 and 98 +/- 10 h at pH 7.4. When native IFN-alpha2 is intravenously administered to mice, circulating antiviral activity is maintained for a short duration and then declines with t(1/2) = 4 +/- 0.5 h, reaching undetectable values at approximately 18 h after administration. With intravenously administered FMS(7)-IFN-alpha2, there is a lag period of 2 h, followed by a progressive elevation in circulating antiviral-active protein, which peaked at 20 h and declined with t(1/2) = 35 +/- 4 h. FMS(7)-IFN-alpha2 is resistant to alpha-chymotrypsin digest and to proteolytic inactivation by human serum proteases in vitro. We have thus introduced here an inactive IFN-alpha2 derivative, which is resistant to in situ inactivation and has the capability of slowly reverting to the native active protein at physiological conditions in vivo and in vitro. Having these attributes, FMS(7)-IFN-alpha2 maintains prolonged circulating antiviral activity in mice, exceeding 7-8 times the activity of intravenously administered native cytokine.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11158619&dopt=Abstract



Antimicrob Agents Chemother. 2001 Feb;45(2):553-62.
Reduction of no synthase expression and tumor necrosis factor alpha production in macrophages by amphotericin B lipid carriers.

Larabi M, Legrand P, Appel M, Gil S, Lepoivre M, Devissaguet J, Puisieux F, Barratt G.

Laboratoire de Physico-Chimie-Pharmacotechnie-Biopharmacie, UMR CNRS 8612, France.

The present study compared the abilities of different lipid carriers of amphotericin B (AMB) to activate murine peritoneal macrophages, as assessed by their capacities to produce nitric oxide (NO) and tumor necrosis factor alpha (TNF-alpha). Although AMB alone did not induce NO production, synergy was observed with gamma interferon but not with lipopolysaccharide. This synergy could not be explained by the mobilization of the nuclear activation factor NF-kappaB by AMB. On the other hand, AMB induced TNF-alpha production without a costimulator and no synergy was observed. Anti-TNF-alpha antibodies did not influence NO production, and an inhibitor of NO synthase did not affect TNF-alpha production, indicating that the production of one of these effector molecules was independent of that of the other. The incorporation of AMB into lipid carriers reduced NO and TNF-alpha production with all formulations but more so with liposomes than with lipid complexes. NO production was correlated with the induction of NO synthase II, revealed by Western blotting. The extent of association of AMB with macrophages depended on the formulation, especially on the AMB/lipids ratio: the higher the ratio was, the greater the AMB association with macrophages. However, there was no clear correlation between AMB association with macrophages, whether internalized or bound to the membrane, and immunostimulating effects. These results may explain the reduced toxicities of lipid-based formulations of AMB.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11158754&dopt=Abstract



Am J Physiol Lung Cell Mol Physiol. 2001 Feb;280(2):L248-57.
IFN-beta mediates coordinate expression of antigen-processing genes in RSV-infected pulmonary epithelial cells.

Jamaluddin M, Wang S, Garofalo RP, Elliott T, Casola A, Baron S, Brasier AR.

Department of Medicine, The University of Texas Medical Branch, Galveston, Texas 77555-1060, USA.

Major histocompatibility complex (MHC) class I-restricted cytotoxic T lymphocytes (CTLs) clear respiratory tract infections caused by the pneumovirus respiratory syncytial virus (RSV) and also mediate vaccine-induced pulmonary injury. Herein we examined the mechanism for RSV-induced MHC class I presentation. Like infectious viruses, conditioned medium from RSV-infected cells (RSV-CM) induces naive cells to coordinately express a gene cluster encoding the transporter associated with antigen presentation 1 (TAP1) and low molecular mass protein (LMP) 2 and LMP7. Neutralization of RSV-CM with antibodies to interferon (IFN)-beta largely blocked TAP1/LMP2/LMP7 expression, whereas anti-interleukin-1 antibodies were without effect, and recombinant IFN-beta increased TAP1/LMP2/LMP7 expression to levels produced by RSV-CM. LMP2, LMP7, and TAP1 expression were required for MHC class I upregulation because the irreversible proteasome inhibitor lactacystin or transfection with a competitive TAP1 inhibitor blocked inducible class I expression. We conclude that RSV infection coordinately increases MHC class I expression and proteasome activity through the paracrine action of IFN-beta to induce expression of the TAP1/LMP2/LMP7 locus, an event that may be important in the initiation of CTL-mediated lung injury.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11159003&dopt=Abstract



Am J Respir Cell Mol Biol. 2001 Feb;24(2):139-45.
Cytokine-induced bronchoconstriction in precision-cut lung slices is dependent upon cyclooxygenase-2 and thromboxane receptor activation.

Martin C, Uhlig S, Ullrich V.

Faculty of Biology, University of Konstanz, Konstanz, Germany. cmartiz-borstel.de

Cytokines play an essential role in the regulation of inflammatory responses. The effects of cytokines on lung functions are less well known and their study in vivo is complicated by the attraction of leukocytes to the inflamed sites. Recently the model of precision-cut lung slices was developed, where viable lung slices with an intact microanatomy are taken into culture and where bronchoconstriction can be followed by observing single airways under the microscope. We used this model to study the direct effects of cytokines on airway tonus in the absence of blood-derived leukocytes. Incubation of precision-cut lung slices with a mixture of tumor necrosis factor (TNF)-alpha, interleukin (IL)-1beta, and interferon (IFN)-gamma resulted in contraction of airways, which was accompanied by expression of cyclooxygenase (Cox)-2 and thromboxane release into the supernatant. The thromboxane receptor antagonist SQ29548 completely prevented the cytokine-induced bronchoconstriction, whereas the 5-lipoxygenase inhibitor AA681 had no effect on cytokine-induced bronchoconstriction. Preventing the expression of Cox-2 by dexamethasone or blocking Cox-2 activity with the selective Cox-2 inhibitor NS398 attenuated both thromboxane formation and bronchoconstriction. Incubation of lung slices with each of the cytokines alone caused no bronchoconstriction; in fact, IL-1 alone rather dilated the airways. However, simultaneous incubation with TNF and IL-1beta caused a bronchoconstriction that was not further enhanced by IFN-gamma. We conclude that TNF-alpha and IL-1beta synergistically cause bronchoconstriction by induction of Cox-2 and subsequent activation of the thromboxane receptor. Our study raises the possibility that TNF and IL-1 may contribute to bronchospasm during inflammatory lung diseases.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11159047&dopt=Abstract



Am J Respir Cell Mol Biol. 2001 Feb;24(2):203-9.
CD8- and CD95/95L-dependent mechanisms of resistance in mice with chronic pulmonary tuberculosis.

Turner J, D'Souza CD, Pearl JE, Marietta P, Noel M, Frank AA, Appelberg R, Orme IM, Cooper AM.

Mycobacterial Research Laboratories, Colorado State University, 200 W. Lake, Fort Collins, CO 80523, USA.

The role of CD8 T lymphocytes in the immune response to Mycobacterium tuberculosis infection remains enigmatic, with persuasive reports of both cytolytic and noncytolytic (cytokine-mediated) responses to infection. To address the importance of the cytolytic mechanisms, mice with targeted disruptions for CD8 and perforin or with gene mutations in the CD95/ CD95L signaling pathway were exposed to pulmonary infection. All mice tested showed no differences in their ability to contain the growth of infection during the early phase of disease. As the chronic phase of the disease ensued, however, both CD8- and CD95/CD95L-deficient mice gradually lost their ability to limit bacterial growth. This was associated with a tendency toward pyogenic inflammation in the lung. This tendency was not seen in the perforin gene-disrupted mice. In CD8 gene-disrupted mice, the ability to generate interferon-gamma secreting T cells was unimpaired. Although these cells were capable of entering the lung they were unable to influence the increasing bacterial load in this organ.


online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11159055&dopt=Abstract







Loss of hair changes the appearance of a person, and the identity of the person in social context to a certain extent. Hair growth is a complex biological process, which has not yet been completely understood. A multitude of therapeutic measures, including drugs, surgery, and suppelements have been made available, and used. However, due to the diversity of the problems underlying hair loss, there is no single solution for all hair loss cases. Most of chemical drugs and hair transplantation surgeries are not free from varying degrees of undesirable side effects on health.

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