Subtype distribution of Blastocystis isolates identified in a Sydney population and pathogenic potential of Blastocystis

Blastocystis is one of the most common enteric parasites present in humans. There is still much uncertainty about the pathogenic potential of this parasite, and it was suggested that its pathogenicity could be subtype-related. This report aimed to study 98 Blastocystis isolates found in human stool specimens to identify the subtypes present and carry out phylogenetic analysis on these isolates. This study also aimed to show the relationship between subtype and symptoms. Five-hundred and thirteen stool samples were submitted to five different diagnostic techniques for the detection of Blastocystis. Polymerase chain reaction (PCR)-positive samples were then sequenced and the small subunit (SSU) rDNA sequences were aligned and submitted to phylogenetic analysis. Ninety-eight samples were positive by any of the diagnostic methods for Blastocystis and 96 were positive by PCR. There were seven different subtypes (1, 2, 3, 4, 6, 7 and 8) identified by PCR and sequencing. This is the first large-scale study to examine the occurrence of Blastocystis in Australia. This study reports the high incidence of subtype 3 (44 %) in this population and discusses the emerging idea of subtype-dependent pathogenicity.

Importance of nonenteric protozoan infections in immunocompromised people

There are many neglected nonenteric protozoa able to cause serious morbidity and mortality in humans, particularly in the developing world. Diseases caused by certain protozoa are often more severe in the presence of HIV. While information regarding neglected tropical diseases caused by trypanosomatids and Plasmodium is abundant, these protozoa are often not a first consideration in Western countries where they are not endemic. As such, diagnostics may not be available in these regions. Due to global travel and immigration, this has become an increasing problem. Inversely, in certain parts of the world (particularly sub-Saharan Africa), the HIV problem is so severe that diseases like microsporidiosis and toxoplasmosis are common. In Western countries, due to the availability of highly active antiretroviral therapy (HAART), these diseases are infrequently encountered. While free-living amoebae are rarely encountered in a clinical setting, when infections do occur, they are often fatal. Rapid diagnosis and treatment are essential to the survival of patients infected with these organisms. This paper reviews information on the diagnosis and treatment of nonenteric protozoal diseases in immunocompromised people, with a focus on patients infected with HIV. The nonenteric microsporidia, some trypanosomatids, Toxoplasma spp., Neospora spp., some free-living amoebae, Plasmodium spp., and Babesia spp. are discussed.

Clinical significance of enteric protozoa in the immunosuppressed human population

Globally, the number of immunosuppressed people increases each year, with the human immunodeficiency virus (HIV) pandemic continuing to spread unabated in many parts of the world. Immunosuppression may also occur in malnourished persons, patients undergoing chemotherapy for malignancy, and those receiving immunosuppressive therapy. Components of the immune system can be functionally or genetically abnormal as a result of acquired (e.g., caused by HIV infection, lymphoma, or high-dose steroids or other immunosuppressive medications) or congenital illnesses, with more than 120 congenital immunodeficiencies described to date that either affect humoral immunity or compromise T-cell function. All individuals affected by immunosuppression are at risk of infection by opportunistic parasites (such as the microsporidia) as well as those more commonly associated with gastrointestinal disease (such as Giardia). The outcome of infection by enteric protozoan parasites is dependent on absolute CD4(+) cell counts, with lower counts being associated with more severe disease, more atypical disease, and a greater risk of disseminated disease. This review summarizes our current state of knowledge on the significance of enteric parasitic protozoa as a cause of disease in immunosuppressed persons and also provides guidance on recent advances in diagnosis and therapy for the control of these important parasites.

Limited genetic diversity among genotypes of Enterocytozoon bieneusi strains isolated from HIV-infected patients from Sydney, Australia

Microsporidia are intracellular parasites, with over 1200 species belonging to 143 genera described to date. They are opportunistic pathogens in humans and can cause chronic diarrhoea in immunosuppressed patients. Both Enterocytozoon bieneusi and Encephalitozoon intestinalis cause intestinal disease, with Enterocytozoon bieneusi more commonly identified in patients with human immunodeficiency virus (HIV) infection. In this study, intestinal microsporidial clinical isolates from patients in Sydney, Australia, were genotyped. All specimens were from HIV-infected men with low CD4(+) T-cell counts (<100 cells mm(-3)). Genotyping of the internal transcribed spacer regions of the rRNA gene showed the presence of only one genotype, the anthroponotic Enterocytozoon bieneusi genotype B strain. This study thus highlighted the limited genetic diversity among Australian Enterocytozoon bieneusi isolates, and it is hypothesized that, due to the reduced incidence of microsporidia and the subsequent reduction in the human reservoir of the anthroponotic genotype B, locally acquired intestinal microsporidiosis will rarely be seen in HIV-infected persons undergoing highly active antiretroviral therapy in the future in Australia.

Achromobacter xylosoxidans subsp. xylosoxidans prosthetic aortic valve infective endocarditis and aortic root abscesses

We report a case of prosthetic valve infective endocarditis and aortic root abscesses caused by Achromobacter xylosoxidans subsp. xylosoxidans. The patient was an intravenous drug user and had injected amphetamines using 'duck pond water' as a diluent. After surgical intervention and 6 weeks of intravenous meropenem therapy, the patient made an uneventful recovery.

Comparison of stool antigen detection kits to PCR for diagnosis of amebiasis

The present study was conducted to compare two stool antigen detection kits with PCR for the diagnosis of Entamoeba histolytica infections by using fecal specimens submitted to the Department of Microbiology at St. Vincent's Hospital, Sydney, and the Institute of Medical and Veterinary Science, Adelaide, Australia. A total of 279 stool samples containing the E complex (E. histolytica, Entamoeba dispar, and Entamoeba moshkovskii) were included in this study. The stool specimens were tested by using two commercially produced enzyme immunoassays (the Entamoeba CELISA PATH and TechLab E. histolytica II kits) to detect antigens of E. histolytica. DNA was extracted from all of the samples with a Qiagen DNA stool mini kit (Qiagen, Hilden, Germany), and a PCR targeting the small-subunit ribosomal DNA was performed on all of the samples. When PCR was used as a reference standard, the CELISA PATH kit showed 28% sensitivity and 100% specificity. The TechLab ELISA (enzyme-linked immunosorbent assay) kit did not prove to be useful in detecting E. histolytica, as it failed to identify any of the E. histolytica samples which were positive by PCR. With the TechLab kit, cross-reactivity was observed for three specimens, one of which was positive for both E. dispar and E. moshkovskii while the other two samples contained E. moshkovskii. Quantitative assessment of the PCR and ELISA results obtained showed that the ELISA kits were 1,000 to 10,000 times less sensitive, and our results show that the CELISA PATH kit and the TechLab ELISA are not useful for the detection of E. histolytica in stool samples from patients in geographical regions where this parasite is not endemic.

Methicillin-resistant Staphylococcus aureus (MRSA) detection: comparison of two molecular methods (IDI-MRSA PCR assay and GenoType MRSA Direct PCR assay) with three selective MRSA agars (MRSA ID, MRSASelect, and CHROMagar MRSA) for use with infection-control swabs

Methicillin-resistant Staphylococcus aureus (MRSA) is an increasing problem. Rapid detection of MRSA-colonized patients has the potential to limit spread of the organism. We evaluated the sensitivities and specificities of MRSA detection by two molecular methods (IDI-MRSA PCR assay and GenoType MRSA Direct PCR assay) and three selective MRSA agars (MRSA ID, MRSASelect, and CHROMagar MRSA), using 205 (101 nasal, 52 groin, and 52 axillary samples) samples from consecutive known MRSA-infected and/or -colonized patients. All detection methods had higher MRSA detection rates for nasal swabs than for axillary and groin swabs. Detection of MRSA by IDI-MRSA was the most sensitive method, independent of the site (94% for nasal samples, 80% for nonnasal samples, and 90% overall). The sensitivities of the GenoType MRSA Direct assay and the MRSA ID, MRSASelect, and CHROMagar MRSA agars with nasal swabs were 70%, 72%, 68%, and 75%, respectively. All detection methods had high specificities (95 to 99%), independent of the swab site. Extended incubation for a further 24 h with selective MRSA agars increased the detection of MRSA, with a corresponding decline in specificity secondary to a significant increase in false-positive results. There was a noticeable difference in test performance of the GenoType MRSA Direct assay in detection of MRSA (28/38 samples [74%]) compared with detection of nonmultiresistant MRSA (17/31 samples [55%]) (susceptible to two or more non-beta-lactam antibiotics). This was not observed with selective MRSA agar plates or IDI-MRSA. Although it is more expensive, in addition to rapid turnaround times of 2 to 4 h, IDI-MRSA offers greater detection of MRSA colonization, independent of the swab site, than do conventional selective agars and GenoType MRSA Direct.

Declining incidence of intestinal microsporidiosis and reduction in AIDS-related mortality following introduction of HAART in Sydney, Australia

Limited data exist regarding the incidence of intestinal microsporidiosis following the introduction of highly active antiretroviral therapy (HAART) in Australia. At St Vincent's Hospital, Sydney, all faecal samples submitted for diarrhoea from HIV-infected patients between 1995 and 2006 underwent screening for microsporidiosis. A total of 3564 patients (7366 faecal specimens) was examined, resulting in 159 patients identified with microsporidiosis. The incidence of microsporidiosis declined from 11% in 1995 to 0% from 2004 onwards. At presentation the majority of patients were severely immunocompromised (median CD4 105 cells/mm(3)), with only 16% of patients on effective HAART. Twenty-four patients (24/76, 32%) died within a median of 22 months following microsporidiosis diagnosis. Significant predictors of AIDS-related mortality at presentation included the level of immunodeficiency and receiving no or ineffective HAART (P<0.05). Patients presenting after 1998 had a significant reduction in the risk of AIDS-related mortality compared with patients presenting before 1998 (hazard ratio 0.27, 95% CI 0.79-0.92). All 52 (68%) surviving patients were on effective HAART, with a median CD4 count 382 cells/mm(3) and HIV RNA of < 50 copies/ml at follow-up (median 4 years). The dramatic decline of intestinal microsporidiosis in our study reconfirms the importance of effective HAART in preventing advanced immunodeficiency, opportunistic infections and associated AIDS-related deaths.

Laboratory diagnostic techniques for Entamoeba species

The genus Entamoeba contains many species, six of which (Entamoeba histolytica, Entamoeba dispar, Entamoeba moshkovskii, Entamoeba polecki, Entamoeba coli, and Entamoeba hartmanni) reside in the human intestinal lumen. Entamoeba histolytica is the causative agent of amebiasis and is considered a leading parasitic cause of death worldwide in humans. Although recent studies highlight the recovery of E. dispar and E. moshkovskii from patients with gastrointestinal symptoms, there is still no convincing evidence of a causal link between the presence of these two species and the symptoms of the host. New approaches to the identification of E. histolytica are based on detection of E. histolytica-specific antigen and DNA in stool and other clinical samples. Several molecular diagnostic tests, including conventional and real-time PCR, have been developed for the detection and differentiation of E. histolytica, E. dispar, and E. moshkovskii in clinical samples. The purpose of this review is to discuss different methods that exist for the identification of E. histolytica, E. dispar, and E. moshkovskii which are available to the clinical diagnostic laboratory. To address the need for a specific diagnostic test for amebiasis, a substantial amount of work has been carried out over the last decade in different parts of the world. The molecular diagnostic tests are increasingly being used for both clinical and research purposes. In order to minimize undue treatment of individuals infected with other species of Entamoeba such as E. dispar and E. moshkovskii, efforts have been made for specific diagnosis of E. histolytica infection and not to treat based simply on the microscopic examination of Entamoeba species in the stool. The incorporation of many new technologies into the diagnostic laboratory will lead to a better understanding of the public health problem and measures to control the disease.

Rhizopus microsporus var. rhizopodiformis sinus-orbital zygomycosis in an immunosuppressed patient: successful treatment with posaconazole after a complicated clinical course

A case of sinus-orbital Rhizopus microsporus var. rhizopodiformis infection in a patient with graft versus host disease following allogeneic blood stem cell transplantation is reported. Commercially available pea straw compost used for gardening was suspected to be the source of the infection. After an initial relapse, treatment with surgical debridement, liposomal amphotericin B and posaconazole was successful.

Bordetella petrii from a clinical sample in Australia: isolation and molecular identification

The first isolation of Bordetella petrii from a patient with chronic suppurative mastoiditis is reported. Molecular characterization of the isolate was performed by sequencing the small-subunit rRNA gene, the Bordetella outer-membrane protein A gene (ompA) and the RisA response regulator gene (risA). This is the first reported case of B. petrii causing suppurative mastoiditis and only the second documented case of a clinically significant B. petrii isolate.

Lymphogranuloma venereum in Australia: anorectal Chlamydia trachomatis serovar L2b in men who have sex with men

Lymphogranuloma venereum (LGV) is a sexually transmitted infection that is causing an ongoing epidemic in men who have sex with men (MSM) in Europe, the United Kingdom, and North America. Twenty-nine rectal swabs positive for Chlamydia trachomatis were analyzed by real-time PCR for the presence of LGV serovars. Genotyping revealed an identical L2b serovar from four specimens. All patients were MSM and human immunodeficiency virus infected. Three of the four presented with severe ulcerative proctitis. We report a cluster of rectal LGV serovar L2b infections in Sydney, Australia.

PCR detection of Entamoeba histolytica, Entamoeba dispar, and Entamoeba moshkovskii in stool samples from Sydney, Australia

This study investigated the presence of Entamoeba histolytica, Entamoeba dispar, and Entamoeba moshkovskii in stool samples from a patient population in Sydney, Australia. Stool samples were tested by microscopy and PCR. Five patients were found with E. histolytica infections, while E. dispar and E. moshkovskii were observed in 63 (70.8%) and 55 (61.8%) patients, respectively, by PCR. This is the first study in Australia using molecular techniques to determine the presence of E. histolytica, E. dispar, and E. moshkovskii.

Veillonella parvula discitis and secondary bacteremia: a rare infection complicating endoscopy and colonoscopy?

We report a case of Veillonella parvula lumbar discitis and secondary bacteremia confirmed by molecular characterization of the 16S rRNA genes. Identification of the organism was essential for an appropriate choice of antimicrobial therapy following the failure of empirical flucloxacillin. Veillonella spp. are normal flora of the gastrointestinal tract, raising the possibility that an endoscopy and colonoscopy performed 8 weeks prior to presentation, during which small intestinal and rectal biopsies were obtained, was the portal of entry. This case highlights the importance of obtaining a microbiologic diagnosis, particularly in patients who previously have had procedures involving instrumentation.

Irritable bowel syndrome: a review on the role of intestinal protozoa and the importance of their detection and diagnosis

Irritable bowel syndrome (IBS) is a functional gastrointestinal disorder in which abdominal pain is associated with a defect or a change in bowel habits. Gut inflammation is one of the proposed mechanisms of pathogenesis. Recent studies have described a possible role for protozoan parasites, such as Blastocystis hominis and Dientamoeba fragilis, in the etiology of IBS. Dientamoeba fragilis is known to cause IBS-like symptoms and has a propensity to cause chronic infections but its diagnosis relies on microscopy of stained smears, which many laboratories do not perform, thereby leading to the misdiagnosis of dientamoebiasis as IBS. The role of B. hominis as an etiological agent of IBS is inconclusive, due to contradictory reports and the controversial nature of B. hominis as a human pathogen. Although Entamoeba histolytica infections occur predominately in developing regions of the world, clinical diagnosis of amebiasis is often difficult because symptoms of patients with IBS may closely mimic those patients with non-dysenteric amoebic colitis. Clinical manifestations of Giardia intestinalis infection also vary from asymptomatic carriage to acute and chronic diarrhoea with abdominal pain. These IBS-like symptoms can be continuous, intermittent, sporadic or recurrent, sometimes lasting years without correct diagnosis. It is essential that all patients with IBS undergo routine parasitological investigations in order to rule out the presence of protozoan parasites as the causative agents of the clinical signs.

Post-kala-azar dermal leishmaniasis due to Leishmania infantum in a human immunodeficiency virus type 1-infected patient

We report the first case of post-kala-azar dermal leishmaniasis due to Leishmania infantum in a human immunodeficiency virus type 1-infected patient in Australia. Molecular characterization of the isolate was performed using PCR restriction fragment length polymorphism targeting both repetitive sequences from Leishmania nuclear DNA and repetitive kinetoplast DNA minicircles for species differentiation.

Evaluation of three diagnostic methods, including real-time PCR, for detection of Dientamoeba fragilis in stool specimens

Dientamoeba fragilis is a protozoan parasite of humans that infects the mucosa of the large intestine and is associated with gastrointestinal disease. We developed a 5' nuclease (TaqMan)-based real-time PCR assay, targeting the small subunit rRNA gene, for the detection of D. fragilis in human stool specimens and compared its sensitivity and specificity to conventional PCR and microscopic examination by a traditional modified iron-hematoxylin staining procedure. Real-time PCR exhibited 100% sensitivity and specificity.

Prospective study of the prevalence, genotyping, and clinical relevance of Dientamoeba fragilis infections in an Australian population

A prospective study was conducted over a 30-month period, in which fecal specimens from 6,750 patients were submitted to the Department of Microbiology at St. Vincent's Hospital, Sydney, Australia. Trophozoites of Dientamoeba fragilis were detected in 60 (0.9%) patients by permanent staining, and confirmation was performed by PCR. Gastrointestinal symptoms were present in all patients, with diarrhea and abdominal pain the most common symptoms. Thirty-two percent of patients presented with chronic symptoms. The average age of infected patients was 39.8 years. No correlation was found between D. fragilis and Enterobius vermicularis, a proposed vector of transmission for D. fragilis. The genetic diversity of 50 D. fragilis isolates was examined by PCR, and the PCR products were analyzed for the presence of restriction fragment length polymorphisms. These results showed no variation in the small-subunit rRNA gene and demonstrated a single genotype for all Australian isolates. This study shows the potential pathogenic properties of D. fragilis and the need for all laboratories to routinely test for this organism.

Detection of Dientamoeba fragilis in fresh stool specimens using PCR

Dientamoeba fragilis is a trichomonad parasite that causes human gastrointestinal disease. Currently microscopy is considered to be the gold standard for diagnosis of D. fragilis infection. However, this method is time-consuming and relatively insensitive. A PCR assay based on the small-subunit ribosomal RNA gene of D. fragilis for the specific detection of D. fragilis DNA in fresh unpreserved stool samples was developed. The D. fragilis PCR was positive in 29/31 samples with positive microscopy and did not cross-react with other protozoan parasites. The PCR protocol showed a specificity of 100% and a sensitivity of 93.5% and the entire procedure can be performed in one day.

The impact of pan-resistant bacterial pathogens on survival after lung transplantation in cystic fibrosis: results from a single large referral centre

Reported actuarial one-year survival for patients with cystic fibrosis (CF) after lung transplant is 55-91%. Infection is the most common cause of early death. Colonization with Burkholderia cepacia complex is associated with reduced survival and international lung transplant referral guidelines support individual unit assessment policies for patients colonized with other pan-resistant bacteria. We examined local data on survival after transplant for CF to determine the impact of colonization with pan-resistant bacteria. A retrospective review of all CF patients from Royal Prince Alfred Hospital (RPAH), Sydney, who underwent lung transplantation at St Vincent's Hospital, Sydney, 1989-2002, was performed. Sixty-five patients were listed for lung transplantation with 54 (male: female=29:25) receiving transplants. Of the 11 patients (17%) who died on the waiting list, six were colonized with pan-resistant Pseudomonas aeruginosa. Thirty of the 54 transplanted patients had at least one pan-resistant organism before transplant. In 28 this included P. aeruginosa. Overall one-year survival was 92% with a median survival of 67 months. Overall survival for the pan-resistant group (N = 30) was not significantly different to survival in those with sensitive organisms (N = 24) (Logrank chi square = 1.6, P = 0.2). Three patients colonized with B. cepacia complex pre-transplant survive at 11, 40 and 60 months post-transplant. Infection contributed to 11 of the 18 post-transplant deaths, with pre-transplant-acquired bacterial pathogens responsible in two cases. Patients continued to acquire multiresistant bacteria post-transplantation. Lung transplant survival at St Vincent's Hospital for CF adults from RPAH compares favourably with international benchmarks. Importantly, colonization with pan-resistant bacteria pre-transplant did not appear to adversely affect survival post-transplant.

Nutrient addition to enhance biological treatment of greywater

This study compares the chemical oxygen demand (COD) removal and respiration rates of a microbial population treating real and synthetic greywaters dosed with nutrient supplements. The nutrient composition of the real and synthetic greywaters was analysed and the dosing regime for nitrogen, phosphorus and a range of trace metals planned accordingly. The doses consisted of eight single additives (macronutrients and trace metals) to the control greywater and six trace metal additions to C: N : P balanced greywater. The COD removal for the control real and synthetic greywater in lab-scale activated sludge systems (0.038 and 0.286 kg COD kg MLSS(-1) d(-1), respectively) confirmed nutrient limitation and the poor degree of greywater treatment. Nutrient dosing increased the COD removal rate and oxygen uptake rate in many cases. The greatest stimulation of microbial activity was observed with zinc additions to C: N: P balanced real greywater (1.291 kg COD kg MLSS(-1) d(-1) over 30 times the control). Inhibitory effects to various extents were rare and limited mainly to the additions of metals to synthetic greywater. The dominance of chemicals effects was observed on addition of some micronutrients; notably iron and aluminium, metals on which many coagulants for use in biotreatment of other wastewaters are based. The data indicate that the impact of understanding microbial processes and the nutrients required for wastewater treatment can only serve to optimise process efficiency for the proposed treatment of greywater.

Modulation of endothelial cell activation in sickle cell disease: a pilot study

The vessel wall endothelium undoubtedly plays a role in the vascular pathobiology of sickle cell disease. This pilot study tested the feasibility of using an inhibitor of nuclear factor (NF)-kappa B, a transcription factor, to modify the endothelial activation state of patients with this vascular disease. For a total of 7 separate drug exposure tests, 3 subjects with sickle cell disease took sulfasalazine (given orally at 1 g every 8 hours), and the activation state of their circulating endothelial cells (CECs) was assessed using immunofluorescence microscopy. Companion studies were also performed using sulfasalazine in sickle transgenic mice to verify its effect simultaneously on both CECs and vessel wall endothelium. Both CECs and tissue vessel wall endothelium in sickle mice have an activated phenotype. In these mice sulfasalazine significantly reduced CEC expression of vascular cell adhesion molecule (VCAM), intracellular adhesion molecule (ICAM), and E-selectin, and it correspondingly reduced expression of these molecules in some tissue vessels. In humans with sickle cell disease, sulfasalazine significantly reduced CEC expression of VCAM, ICAM, and E-selectin, but it did not reduce expression of tissue factor. Addition of a second transcription factor inhibitor, salsalate, did not change this result. This pilot study suggests that endothelial cell activation state can be modified and down-regulated in vivo by sulfasalazine. (Blood. 2001;97:1937-1941)

Involving family members in cancer care: focus group considerations of patients and oncological providers

Family members are an integral part of a patient's cancer care from the moment the diagnosis is delivered to the conclusion of treatment. Family members bring with them a range of emotional reactions, interpersonal dynamics and expectations for the care the patient receives. This study is part of a multi-institutional project to continue to improve the process of cancer care. In this study, 19 focus groups (11 patient and 8 provider) were conducted concerning issues related to doctor-patient communication in eight cancer centers in the United States. The content of the conversations was analyzed and thematic categories emerged that highlight the various strengths and difficulties associated with family involvement. The focus groups' comments support the need for explicit conversations between professional caregivers, patients and their loved ones, in order to negotiate the expectations and needs of each team member. Implications for clinical practice and strategies for working with family members are offered.

Integrating cultures: a tool for mission leaders and others in collaborating organizations

This resource, Integrating Cultures, is a direct response to numerous requests received last fall from mission leaders in CHA-member organizations struggling with the cultural realities of strategic alliances. This tool presents the learnings of five authors who shared their significant experience of collaborative activities in ministry organizations, ranging from joint operating agreements to full mergers of assets and expenses. This resource specifically addresses the challenges facing organizations in the first 18 to 24 months follow the finalization of a collaboration. Strategies are presented here for bringing together previously distinct communities of people into positive, healthy new cultures that reflect the visions and purposes of the collaborative activities. Future articles will recommend culture integration strategies appropriate at other points along the collaboration timeline: the period of initial investigation, the stage of due diligence, and the ongoing life of collaborating entities two years and more after signing the final papers. Integrating Cultures and a resource from CHA collaboration with other-than-Catholic organizations (set for publication later this spring) were developed in response to members' requests for the accurate information they need as they proceed with integration strategies in today's healthcare environment. These resources are examples of the powerful knowledge e transfer and wisdom sharing that is possible when ministry leaders work with and for one another to make Christ's healing presence more evident in our world.

Antibodies to a synthetic peptide can be used to distinguish between muscarinic acetylcholine receptor binding sites in brain and heart

Since the reports elucidating the sequence of four subtypes of muscarinic cholinergic receptors appeared, it has been clear that pharmacological approaches to the study of subtypes of these receptors are inadequate to selectively detect one subtype in the presence of the others. One methodology that can provide more selective reagents with which to study these subtypes is immunology. Thus, using the information on the primary sequence of these receptors available in the literature, rabbits were injected with an oligopeptide, CRKIPKRPGSVHRTPSRQ, conjugated to keyhole limpet hemocyanin. This oligopeptide (m1 C-terminal peptide) corresponds to the 17-amino acid sequence of the carboxyl terminus of a rat m1 muscarinic receptor. This portion of the amino acid sequence of the muscarinic receptor protein has been shown to be unique to the m1 receptor and has not been found in the other subtypes of the receptor thus far sequenced. The antisera (anti-m1 antisera) had high titer against the m1 C-terminal peptide in a solid phase radioimmunoassay. The anti-m1 antisera were shown to immunoprecipitate [3H] quinuclidinyl benzilate ([ 3H]QNB) binding activity solubilized from rat forebrain. [3H]Pirenzepine ([ 3H]PZ) has been shown to interact with a subset of [3H]QNB binding sites in forebrain and heart. The anti-m1 antisera were shown to immunoprecipitate [3H]PZ binding sites in cerebral cortex, hippocampus, and corpus striatum, areas believed to be rich in the m1 subtype of the muscarinic receptor. Although [3H]PZ binding activity was present in receptor preparations solubilized from heart, neither [3H]PZ- nor [3H]QNB-binding activities could be immunoprecipitated from this tissue using the anti-m1 antisera. A monoclonal antibody raised against the porcine atrial muscarinic receptor was shown to immunoprecipitate both [3H]PZ- and [3H]QNB-binding activities solubilized from rat heart, but only [3H]QNB-binding activity could be immunoprecipitated from forebrain using this antibody. Immunoprecipitation of [3H]PZ- and [3H]QNB-binding activity by anti-m1 antisera could be inhibited by the m1 C-terminal peptide. Peptides corresponding to the C-terminal portions of the rat m3 and m4 muscarinic receptor were not inhibitory in the immunoprecipitation assay. This study provides further evidence for subtypes of muscarinic receptors in rat tissues and supports the hypothesis that receptor subtypes defined using PZ can be further subclassified on the basis of differences in primary structure.(ABSTRACT TRUNCATED AT 400 WORDS)

Gastrointestinal viral infections in homosexual men who were symptomatic and seropositive for human immunodeficiency virus

Gastrointestinal viruses, predominantly rotaviruses and adenoviruses, were detected by enzyme-linked immunosorbent assay, electron microscopy, or cell culture in greater than 50% of two groups of homosexual men with symptomatic human immunodeficiency virus (HIV) infection, who did (54%) or did not (50%) have diarrhea. Lower detection rates were observed in HIV-seronegative (15%) and asymptomatic HIV-seropositive (16%) men. In the patients with diarrhea, 95% of the isolates of virus were found in the most immunosuppressed patients, those patients with AIDS-related complex or opportunistic infections associated with AIDS. High excretion rates of these viruses are probably associated with both anal-oral transmission and immunosuppression. These viruses apparently cause acute episodes or relapses of diarrhea in some patients but may be co-pathogens or noncontributory to chronic diarrhea in others.

Needs of the poor call for action on behalf of justice

Catholic health facilities are a special representation or incarnation of the Church. Our response to the medically indigent is perhaps the paradigmatic way we can mediate Christ and Christian values. In the last century the Church's social teaching has reiterated the understanding that Christ identifies with the poor and the underprivileged. The fundamental challenge seems to be how to move this "option for the poor" rom theological scholarship and reflection to healthcare ministry. Poverty and the lack of access to healthcare need to be seen not simply as the problem of individuals but as structural problems. Witnessing, education, and acting on behalf of the poor require the whole healthcare community's cooperation. Individual efforts are multiplied when they are a real part of a "corporate culture" genuinely committed to the poor. One such corporate effort was undertaken by the Sisters of Bon Secours when they developed their Ministerial Stand on Care of the Poor in 1984. A task force published 32 recommendations to aid facility managers in carrying out the statement. Mission committees were formed at Bon Secours Health System facilities to oversee implementation of the recommendations. They promote and evaluate innovative programs to address care of the poor initiatives for the local community.

Pulmonary manifestations of the acquired immunodeficiency syndrome

Between 1983 and 1985, 71 patients with the acquired immunodeficiency syndrome (AIDS) were evaluated. Pulmonary manifestations were present in 42 patients (59%). Pneumocystis carinii pneumonia (PCP) was the most common pulmonary manifestation, present in 32 patients (45%). Other pulmonary findings were cytomegalovirus pneumonia (one patient), Candida pneumonia (one patient), cryptococcal pneumonia (one patient), bacterial pneumonia (three patients), nonspecific pneumonitis (three patients), Kaposi's sarcoma (one patient), and non-Hodgkin's lymphoma (one patient). The presenting features of PCP were reviewed and in seven patients the chest X-ray and blood gases were normal at the time of diagnosis of PCP. Bronchoscopy was a safe and useful technique for obtaining specimens for diagnosis promptly, and a combination of samples obtained by bronchial washings/brushings and transbronchial biopsy was found to give a higher diagnostic yield than any single sample. Drug side-effects were common during therapy, requiring change of therapy in 16 patients. At one month after diagnosis 16% of patients with PCP had died. PCP is a common pulmonary manifestation in patients with AIDS which is treatable and has an initially favourable outcome.

Kinetic studies suggest that light-activated cyclic GMP phosphodiesterase is a complex with G-protein subunits

Cyclic GMP phosphodiesterase (PDE) in rod disk membranes has three subunits of molecular weight 88 000 (alpha), 84 000 (beta), and 13 000 (gamma). Physiological activation of the enzyme by light is mediated by a GTP binding protein (G protein). The enzyme can also be activated by controlled digestion with trypsin, which destroys the gamma subunit, leaving the activated enzyme as PDE alpha beta [Hurley, J. B., & Stryer, L. (1982) J. Biol. Chem. 257, 11094-11099]. Addition of purified gamma subunit to PDE alpha beta inhibited the enzyme fully. This suggested the possibility that G protein could also activate PDE by removing the gamma subunit and leaving the active enzyme in the form of PDE alpha beta. Should this be true, the properties of light- and trypsin-activated enzymes should be comparable. We found this not to be the case. The Km of light-activated enzyme for cyclic GMP was about 0.9-1.4 mM while that of trypsin-activated enzyme was about 140 microM. The cyclic AMP Km was also different for the two enzymes: 6.7 mM for light-activated enzyme and 2.0 mM for trypsin-activated enzyme. The inhibition of both enzymes by the addition of purified gamma subunit also differed significantly. Trypsin-activated enzyme was fully inhibited by the addition of about 200 nM gamma, but light-activated enzyme could not be fully inhibited even with 2600 nM inhibitor subunit. The Ki of the trypsin-activated enzyme for gamma was 15 nM and of the light-activated enzyme 440 nM.(ABSTRACT TRUNCATED AT 250 WORDS)

Controlled comparison of short-wave diathermy treatment with osteopathic treatment in non-specific low back pain

The effectiveness of spinal manipulation carried out by a non-medical qualified osteopath was compared with that of short-wave diathermy (SWD) and a placebo (detuned SWD) in 109 patients with low back pain. More than half the subjects in each of the 3 treatment groups benefited immediately from therapy. Significant improvements were observed in the 3 groups at the end of 2 weeks' treatment, and these were still apparent at 12 weeks. The outcome of treatment was unrelated to the initial severity or duration of pain or to the trend of pain towards deterioration or improvement. It is, therefore, unlikely that the results simply reflect the natural history of low back pain. Benefits obtained with osteopathy and SWD in this study may have been achieved through a placebo effect.

On the capillary-tube viscometry of placental blood

This work was done as the first part of a continuing study of neonatal blood. In a recent paper (1), two parameters, "A" (relative whole-blood viscosity at unit rate of shear and 1% haematocrit) and "beta" (shear-sensitivity exponent) were proposed, as characteristics of a given blood-sample. Here, some 60 placentae yielded (after plasma-manipulation) 130 sub-samples having haematocrits ranging from 3% to 90%. Their viscosities were measured in a capillary viscometer set for a constant wall shear-stress of 1855 mPa. "A" and "beta" were calculated by the method given in (1). Multiple calculations on a number of sub-samples revealed systematic variations within any one blood; but when every A/beta ratio is plotted against the corresponding A, the results follow a smooth curve. This curve occupies a striking, almost central location when A-and-beta values from adult normal and pathological bloods (rotational viscometry) are superimposed on the diagram. An analytic form for the close correlation between haematocrit and relative placental blood-viscosity is given by the adoption of a single "group A" and "group beta" for all 130 results.

Phenol alcohol technique for permanent matricectomy

A simple technique for partial or complete destruction of the nail matrix with the use of phenol alcohol is outlined. A retrospective analysis of 30 random patients suggests that it has a low morbidity, is easy to perform, and has a high success rate. Therefore, it offers an excellent option to cold steel surgery, especially for the nonsurgically oriented dermatologist.

Bone marrow transplantation in 33 patients with malignant blood diseases and severe aplastic anaemia

Allogeneic bone marrow transplantation using HLA-identical sibling donors was performed in 29 patients with malignant blood diseases and in four patients with severe aplastic anaemia. Twenty-five patients received immunosuppressive therapy with cyclosporin A to minimize graft-versus-host disease (GVHD) and eight received methotrexate. Twenty-one of 29 patients (72%) with malignant blood diseases and three of the four patients with severe aplastic anaemia remained alive and disease-free from 0.5 to 16 (median, seven) months after transplantation. Acute GVHD, predominantly of the skin, occurred in 25 of 28 evaluable cyclosporin A recipients (of whom two died), and in all five evaluable methotrexate recipients. Mild chronic GVHD occurred in 10 of 16 evaluable patients. Interstitial pneumonitis occurred in five patients, of whom two died. HLA-identical sibling marrow transplantation is associated with a mortality similar to that of induction chemotherapy for acute leukaemia, and should be considered in adults with acute leukaemia in remission or relapse, chronic myelogenous leukaemia in metamorphosis or blastic transformation, lymphoma unresponsive to conventional therapy, and in severe aplastic anaemia.

Plasma viscosity, haematocrit and red-cell transport

An erythrocyte transport function (ETF) is proposed, as an index of the efficiency of the circulation of red cells. Under defined conditions, this ETF is shown to be proportional to the ratio of haematocrit to whole-blood viscosity (phi/eta), a ratio already used by Chien. The variations of phi/eta with phi, at selected driving pressures in a capillary viscometer, are presented, both for normal and for pathological blood samples. Maximal values of phi/eta appear generally to occur at haematocrits of about 42%, and are strongly dependent upon plasma viscosity. They are also influenced by shear. The concept of 'isograds' (curves of phi/eta against phi at constant velocity gradient) is introduced, and is analysed in technical appendices which also deal with rates of shear in capillary and rotational viscometers when Newtonian or shear-sensitive liquids are measured.

Whole-blood viscosity, as determined by plasma viscosity, haematocrit, and shear

The viscometers used were: (a) a proprietary rotational coaxial-cylinder instrument; and (b) a Harkness capillary-tube viscometer. In (a), the mean shear-rate is selected by the choice of rotational speed. In (b), the wall shear-stress is selected by the choice of driving-pressure. If the viscosity is varied, the mean shear-rate varies, at constant wall shear-stress. The present paper attempts to show how, in principle, a complete family of "constant-rate" (rotational) curves can be computer-plotted from two suitably-spaced capillary-tube measurements. The reverse process, involving the correction of "playback" errors, is touched upon. A variable "Einstein coefficient" is derived from the principal parameters in the computer solution; and the basic problems of compatibility in "rates of shear" are discussed.

Lymphocyte studies in rheumatoid arthritis. V. Suppressor cell function in peripheral blood

Peripheral blood lymphocytes from 30 patients with rheumatoid arthritis and 14 controls were examined for suppressor activity by two different assays. These were the Concanavalin-A-induced and the short-lived suppressor cell assays. There was no difference in suppressor activity between patients and controls, the suppressor activity of HLA-DR3 positive patients was no less than that of non-DR3 patients. However, patients with nodules showed reduced suppression in the short-lived suppressor cell assay when compared with patients without nodules.