Airborne acquisition of Pneumocystis in bronchoscopy units: a hidden danger to healthcare workers.

The possible presence of Pneumocystis in a bronchoscopy unit of a tertiary-hospital was examined by detecting Pneumocystis-specific DNA by polymerase chain reaction in prospectively obtained samples of oropharyngeal wash from seven healthcare workers (HCWs) and air from three areas of the unit at different time points (baseline, days +15,+30,+60,+90 after initiation of the study). Positive samples were genotyped at two genetic loci: the mitochondrial large subunit ribosomal RNA (mtLSUrRNA) fragment by direct sequencing and the gene for dihydropteroate synthase (DHPS) by restriction fragment-length polymorphism. Pneumocystis DNA was identified in 13/24 samples from HCWs, in 4/14 air samples and also in two patients with Pneumocystis pneumonia (PcP) and another with a Pneumocystis-associated disease subjected to bronchoscopy on days +15 and +60 after initiation of the study. The HCWs harbored a high rate of mtLSU-rRNA genotypes 1 and 3 and samples from air and patients with only genotype 3. DHPS mutations related to sulpha resistance were detected in three samples from HCWs and in one from air; 65% of the positive samples showed genotypic concordance. The study demonstrates that HCWs of bronchoscopy units represent a new dynamic reservoir and a possible source of infection for human Pneumocystis species, including DHPS genotypes related to sulpha resistance that could be transmitted within hospitals to immunosuppressed hosts in whom a PcP can develop. The results provide the first evidence of the risk of Pneumocystis transmission in the bronchoscopy units and arguments to improve prevention and control of this infection in nosocomial setting.

Pneumocystis jirovecii colonization in patients treated with infliximab.

BACKGROUND: Infliximab, a chimeric antitumour necrosis factor (TNF) monoclonal antibody, has become an established effective therapy for inflammatory rheumatic disease. However, TNF is a critical factor in host defence, and the suppression of its biological activity may be associated with the increased risk of opportunistic infections. The frequent use of infliximab in clinical practice has identified Pneumocystis jirovecii pneumonia (PcP) as a serious complication. Individuals colonized with Pneumocystis may be at high risk of development of PcP when they have undergone immunosuppression. Hence, we addressed the question of the frequency of Pneumocystis colonization among patients treated with infliximab. DESIGN: We examined 125 oropharyngeal washes collected from 78 individuals with rheumatoid arthritis, 30 with ankylosing spondylitis and 17 with psoriatic arthritis, half of them underwent infliximab therapy, using a real-time polymerase chain reaction assay that employs specific primers from a portion of the mitochondrial large-subunit rRNA gene of P. jirovecii. RESULTS: Pneumocystis jirovecii colonization was detected in 32 (25·6%) patients. In a multivariate regression model, only duration of infliximab treatment for more than 3 years and use of corticosteroid were significantly and independently associated with risk of Pneumocystis colonization. However, the effect of corticosteroid on P. jirovecii colonization rate was not linearly dose dependent as showed other logistic regression analysis. CONCLUSIONS: There is a high rate of P. jirovecii colonization among patients with rheumatologic diseases treated with infliximab. The identification of patients colonized by P. jirovecii before starting the treatment with infliximab could be a strategy for PcP prevention.

Dinuclear triphenylphosphinegold(I) sulfanylcarboxylates: Synthesis, structure and cytotoxic activity against cancer cell lines.

Compounds of the type [(AuPPh(3))(2)(xspa)]; H(2)xspa [x:p=3-phenyl-, f=3-(2-furyl)-, t=3-(2-thienyl)-, -o-py=3-(2-pyridyl)-, Clp=3-(2-chlorophenyl)-, -o-mp=3-(2-methoxyphenyl)-, -p-mp=3-(4-methoxyphenyl)-, -o-hp=3-(2-hydroxyphenyl)-, -p-hp=3-(4-hydroxyphenyl)-, -diBr-o-hp=3-(3,5-dibromo-2-hydroxyphenyl)-; spa=2-sulfanyl propenoato] were synthesized and characterized by IR and NMR ((1)H, (13)C and (31)P) spectroscopy and by FAB mass spectrometry. The structures of [(AuPPh(3))(2)(Clpspa)], [(AuPPh(3))(2)(o-hpspa)], [(AuPPh(3))(2)(p-hpspa)].MeOH and [(AuPPh(3))(2)(diBr-o-hpspa)].2Me(2)CO show the dinuclear nature of the complexes with the two gold atoms, one of which is also O-bonded to an O atom of the carboxylate group, bonded to the S atom. The in vitro antitumor activities against the HeLa-229, A2780 and A2780cis cell lines were determined and the compounds were found to be highly effective, in particular against the A2780cis cell line, with eight of the nine compounds having IC(50) values better than that of cisplatin. This behavior is indicative of a high ability to circumvent the cellular resistance to this drug.

El ser humano como reservorio de Pneumocystis / Human reservoirs of Pneumocystis

Pneumocystis jirovecii es un hongo y se lo reconoce como una especie que infecta exclusivamente a seres humanos; es el agente causante de la PCP (Pneumocystis pneumonia ‘neumonía por Pneumocystis’). La utilización de técnicas de biología molecular como herramienta diagnóstica ha permitido detectar la presencia de este hongo en individuos que se encuentran solamente colonizados por el microorganismo. Esta colonización, observada en diversos grupos de población, puede actuar como un reservorio del hongo para el ser humano. Varios estudios también han demostrado la presencia de P. jirovecii con mutaciones asociadas a resistencia a sulfamidas en pacientes colonizados; éstos podrían transmitir este genotipo mutante a individuos susceptibles al desarrollo de una PCP. El creciente interés respecto a la colonización por P. jirovecii conducirá a diseñar nuevas estrategias para la prevención y el tratamiento de la neumonía causada por este patógeno (AU)

Pneumocystis jirovecii, the fungal agent that causes Pneumocystis pneumonia (PCP), is known to exclusively infect humans. Molecular studies have enabled detection of this fungus in individuals who have been colonized by P. jirovecii. Such colonization, found in several populations, seems to act as a human reservoir for the fungus. Various studies have reported mutations associated with sulfa resistance in P. jirovecii strains isolated from colonized patients, who can transmit the mutant genotype to PCP-susceptible individuals. The growing interest in P. jirovecii colonization may prompt the design of new prevention and management strategies for PCP (AU)

[Human reservoirs of Pneumocystis]. / El ser humano como reservorio de Pneumocystis.

Pneumocystis jirovecii, the fungal agent that causes Pneumocystis pneumonia (PCP), is known to exclusively infect humans. Molecular studies have enabled detection of this fungus in individuals who have been colonized by P. jirovecii. Such colonization, found in several populations, seems to act as a human reservoir for the fungus. Various studies have reported mutations associated with sulfa resistance in P. jirovecii strains isolated from colonized patients, who can transmit the mutant genotype to PCP-susceptible individuals. The growing interest in P. jirovecii colonization may prompt the design of new prevention and management strategies for PCP.

Synthesis, structure and cytotoxicity studies of diisopropylammonium and triethylammonium salts of triphenylphosphinegold(I) sulfanylcarboxylates.

Compounds of the type [HQ][Au(PPh(3))(xspa)] and [HP][Au(PPh(3))(xspa)] {HQ=diisopropylammonium; HP=triethylammonium; H(2)xspa=3-aryl-2-sulfanylpropenoic acids [x: p=3-phenyl-, f=3-(2-furyl)-, t=3-(2-thienyl)-, -o-py=3-(2-pyridyl)-, Clp=3-(2-chlorophenyl)-, -o-mp=3-(2-methoxyphenyl)-, -p-mp=3-(4-methoxyphenyl)-, -o-hp=3-(2-hydroxyphenyl)-, -p-hp=3-(4-hydroxyphenyl)-, diBr-o-hp=3-(3,5-dibromo-2-hydroxyphenyl]} were synthesized and characterized by IR and NMR ((1)H, (13)C and (31)P) spectroscopy and by FAB mass spectrometry. The structures of [HQ][Au(PPh(3))(Clpspa)] and [HQ][Au(PPh(3))(-o-mpspa)] show that the crystal contains hydrogen-bonded diisopropylammonium cations and [Au(PPh(3))(xspa)](-) anions. The anions in the two compounds have different structures, with the carboxylate group either coordinated or not coordinated to the gold atom, respectively. The in vitro antitumour activities against the HeLa-229, A2780 and A2780cis cell lines were determined for all complexes. The diisopropylammonium derivatives were generally found to be more active, in particular against the A2780cis cell line, and showed a high ability to circumvent the cellular resistance to cisplatin.

Synthesis and antimicrobial activities of silver(I) 3-(substituted phenyl)sulfanylpropenoates.

We investigated the reactions of silver nitrate with 3-(substituted phenyl)-2-sulfanylpropenoic acids H(2)L [L=xspa, where spa=2-sulfanylpropenoato and xin{Clp=3-(2-chlorophenyl)-, -o-mp=3-(2-methoxyphenyl)-, -o-hp=3-(2-hydroxyphenyl)-, -p-hp=3-(4-hydroxyphenyl)-, diBr-o-hp=3-(3,5-dibromo-2-hydroxyphenyl)-}] in 1:1 and 2:1 molar ratios. The 1:1 reactions gave compounds of type [Ag(HL)], which reacted with NaOH to afford Na[Ag(L)].xH(2)O (x=1 or 2) and with diisopropylamine to afford [HQ][Ag(L)] (HQ=diisopropylammonium). The 2:1 reactions gave products of type [Ag(2)(L)]. All the new compounds were isolated and characterized by IR spectroscopy, and all except the 2:1 adducts (which were insoluble) were studied by (1)H and (13)C NMR spectroscopy; ESI-MS spectrometry was also used for [HQ][Ag(L)] and Na[Ag(L)].xH(2)O, and the crystal structures of H(2)Clpspa and [HQ][Ag(Clpspa)] were determined by X-ray diffractometry. The antimicrobial activities of the complexes against Escherichia coli, Staphylococcus aureus, Bacillus subtilis, Candida albicans, Pseudomonas aeruginosa and carbapenem-resistant P. aeruginosa were evaluated and compared with those of Ag(I) complexes with other aryl sulfanylpropenoates or related ligands.

Pneumocystis jirovecii transmission from immunocompetent carriers to infant.

We report a case of Pneumocystis jirovecii transmission from colonized grandparents to their infant granddaughter. Genotyping of P. jirovecii showed the same genotypes in samples from the infant and her grandparents. These findings support P. jirovecii transmission from immunocompetent carrier adults to a susceptible child.

Antiphospholipid antibodies investigation in Pneumocystis jirovecii carriers.

It is well documented that antiphospholipid antibodies are increased in patients with HIV-1 infection and these are most commonly seen in those with Pneumocystis jirovecii pneumonia. Therefore it has been proposed that this could be the cause of its presence. Recently, P. jirovecii subclinical infection has been described in non-immunodeficient patients. We report here our experience concerning the possible relationship between P. jirovecii infection in non-immunocompromized adults and the production of antiphospholipid antibodies. Circulating lupus anticoagulant and IgM anticardiolipin antibodies were negative in all patients. IgG anticardiolipin antibodies were positive in 2 out of 5 (40%) P. jirovecii carriers and 2 out of 10 (20%) subjects with no evidence of pulmonary infection by this microorganism (p=0.4).

Synthesis, structural characterization, and antiinflammatory activity of triethylphosphinegold(I) sulfanylpropenoates of the type [(AuPEt3)2xspa] [H2xspa = 3-(aryl)-2-sulfanylpropenoic acid]: an (H2O)6 cluster in the lattice of the complexes [(AuPEt3)2xspa] x 3 H2O.

Gold complexes of the type [(AuPEt3)2xspa] were prepared by reacting AuPEt3Cl in basic media with the 3-(aryl)-2-sulfanylpropenoic acids H2xspa [x = p, Clp, -o-mp, -p-mp, -o-hp, -p-hp, diBr-o-hp, f, t, -o-py; p = 3-phenyl, Clp = 3-(2-chlorophenyl)-, -o-mp = 3-(2-methoxyphenyl)-, -p-mp = 3-(4-methoxyphenyl)-, -o-hp = 3-(2-hydroxyphenyl)-, -p-hp = 3-(4-hydroxyphenyl)-, diBr-o-hp = 3-(3,5- dibromo-2-hydroxyphenyl)-, f = 3-(2-furyl)-, t = 3-(2-thienyl)-, -o-py = 3-(2-pyridyl); spa = 2-sulfanylpropenoato], and 2-cyclopentylidene-2-sulfanylacetic acid (H2cpa). The complexes were characterized by spectroscopic methods (IR, (1)H, (13)C and (31)P NMR) and mass spectrometry, and the complexes [(AuPEt3)2pspa] x 3 H2O, [(AuPEt3)2-p-hpspa] x 3 H2O, [(AuPEt3)2tspa)] x 3 H2O, and [(AuPEt3)2-o-hpspa] by X-ray diffractometry. The crystals of the first three complexes contain (H2O)6 clusters hydrogen bonded to [(AuPEt3)2xspa]2 dimer units, whereas in the -o-hpspa derivative the hydrogen bonds are between the monomer [(AuPEt3)2-o-hpspa] units. The antiinflammatory activity of the complexes against plantar edema induced by carrageenan in rats is generally significant, with the values for the o-hpspa and tspa derivatives being particularly high.

Synthesis, structure and cytotoxicity of triphenylphosphinegold(I) sulfanylpropenoates.

The reaction of triphenylphosphinegold(I) chloride in ethanol in a 1:1 molar ratio with the 3-(aryl)-2-sulfanylpropenoic acids H(2)xspa [x: p=3-phenyl-, Clp=3-(2-chlorophenyl)-, -o-mp=3-(2-methoxyphenyl)-, -p-mp=3-(4-methoxyphenyl)-, -o-hp=3-(2-hydroxyphenyl)-, -p-hp=3-(4-hydroxyphenyl)-, diBr-o-hp=3-(3,5-dibromo-2-hydroxyphenyl)-, f=3-(2-furyl)-, t=3-(2-thienyl)-, -o-py=3-(2-pyridyl)-; spa=2-sulfanylpropenoato] gave compounds of the type [Au(PPh(3))(Hxspa)], which were isolated and characterized as solids by elemental analysis, IR spectroscopy and FAB mass spectrometry and in solution by (1)H, (13)C and (31)P NMR spectroscopy. The structures of the complexes [Au(PPh(3))(HClpspa)], [Au(PPh(3))(H-o-mpspa)] and [Au(PPh(3))(H-p-mpspa)].2/3C(3)H(6)O were determined by X-ray diffractometry. Hydrogen bonding was found along with Au-S and Au-P bonds in all cases and weak pi-pi stacking was found in the H-p-mpspa derivative. The in vitro antitumour activities against the HeLa-229, A2780 and A2780cis cell lines were determined for all complexes.

Synthesis and antimicrobial activities of silver(I) sulfanylcarboxylates. Structural isomers with identically or unequally coordinated Ag centers in an Ag4S4 ring.

We have investigated the reactions of silver nitrate and 3-(aryl)-2-sulfanylpropenoic acids [H(2)xspa, x: p = 3-phenyl-, f = 3-(2-furyl)-, t = 3-(2-thienyl)-, py = 3-(2-pyridyl)-] and 2-cyclopentylidene-2-sulfanylacetic acid (H(2)L) in 1 : 1 and 2 : 1 molar ratios. The 1 : 1 molar ratio gave compounds of type [Ag(HL)]; reaction of these compounds with diisopropylamine and NaOH gave [HQ][Ag(L)] (HQ = diisopropylammonium) and Na[Ag(L)] x H(2)O, respectively. These compounds, as well as those of type [Ag(2)(L)] obtained with the 1 : 2 molar ratio, were isolated and characterized by IR and NMR ((1)H and (13)C) spectroscopy. (109)Ag NMR spectroscopy and ESI-MS spectrometry were also used in some cases. The crystal structures of [HQ][Ag(pspa)] (11), in which the presence of structural isomers was detected, and [HQ][Ag(cpa)] (15) were determined by X-ray diffractometry. The antimicrobial activity of the complexes against E. coli, S. aureus, B. subtilis, P. aeruginosa/Resistant P. aeruginosa, and C. albicans was tested.

Systemic inflammation in patients with chronic obstructive pulmonary disease who are colonized with Pneumocystis jiroveci.

In chronic obstructive pulmonary disease, high levels of airway and systemic inflammatory markers are associated with a faster decrease in lung function. Our study shows that patients colonized by Pneumocystis jiroveci have higher proinflammatory cytokine levels than do noncolonized patients. This suggests that Pneumocystis may play a role in disease progression.

New structural features in triphenylphosphinesilver(I) sulfanylcarboxylates.

We investigated the reactions of 1.5 : 1 : 1 mole ratio mixtures of triphenylphosphine, silver nitrate and 3-(aryl)-2-sulfanylpropenoic acids H(2)xspa in chloroform/water, where in the acid nomenclature, spa = 2-sulfanylpropenoato and x = p, Clp, mp, diBr-o-hp or f with p = 3-phenyl-, Clp = 3-(2-chlorophenyl)-, mp = 3-methoxyphenyl-, diBr-o-hp = 3-(3,5-dibromo-2-hydroxyphenyl)- and f = 3-(2-furyl)-. The compounds [Ag(PPh(3))(Hpspa)](1), [(AgPPh3)2(xspa)][x = Clp (2), o-mp (3), p-mp (4), diBr-o-hp (5) and f (6)] and [Ag(PPh3)3(Hfspa)](7) were isolated and all except 7 were characterized by IR, Raman and FAB mass spectrometry and by 1H, 13C and 31P NMR spectroscopy. Compound 6 was also characterized by (13)C CP/MAS, and compounds 1 and 6 by (109)Ag NMR spectroscopy. The crystal structures of 1, 2, 3, 4.(CH3)2CO, 5, 6.(CH3)2CO and 7 were determined by X-ray diffraction. has a supramolecular structure based on hydrogen bonding between dinuclear units, and all the other complexes adopt discrete structures. 2, 3, 4.(CH3)2CO, 5, and 6.(CH3)2CO are tetranuclear, and 7 mononuclear. The tetranuclear complexes contain the eight-membered coordination ring Ag4S2O2 (2, 3, 4.(CH3)2CO, 6.(CH3)2CO) or the twelve-membered ring Ag4(CO2)2S2 (5).

Pneumocystis jirovecii in general population.

The possible presence of Pneumocystis among healthy adults was examined by detecting Pneumocystis jirovecii-specific DNA in prospectively obtained oropharyngeal wash samples from 50 persons without underlying lung disease or immunosuppression. Pneumocystis carriage, defined by detecting Pneumocystis DNA by nested polymerase chain reaction in 2 independent analyses plus successful mitochondrial large subunit ribosomal RNA typing by direct sequencing, was found in 20% of cases. All carriers were asymptomatic, anti-HIV negative, and had normal total lymphocyte and CD4+ cell counts. A second sample obtained in the 6-month follow-up was positive in 2 of 9 available carriers. Genotype analysis showed different polymorphisms; 85A/248C (40%) and 85C/248C (30%) were most frequently observed. This study provides the first evidence that P. jirovecii DNA can be frequently detected in the respiratory tract of immunocompetent adults, which agrees with the hypothesis that the general population could be a reservoir and source of this infection.