The Epidemiology of Depressive Symptoms and Poor Sleep: Findings from the English Longitudinal Study of Ageing (ELSA)

Purpose

The reasons for the comorbidity between depressed mood and poor sleep are not well understood.

Method

Participants were 5172 adults aged 50 years and older from the English Longitudinal Study of Ageing. Sleep was measured via self-report and depressive symptoms using the Centre for Epidemiological Studies Depression scale.

Results

Greater depressive symptoms and sleep complaints were associated with female sex, non-cohabitation, relative poverty, smoking, infrequent physical activity, infrequent alcohol consumption, higher body mass index (BMI), diagnosis of hypertension, coronary heart disease, diabetes/high blood glucose, pulmonary disease, arthritis, and higher levels of fibrinogen and C-reactive protein (all p?<?0.05). At a 4-year follow-up, depressive symptoms and sleep complaints were both predicted by baseline depressive symptoms and sleep complaints, relative poverty, smoking, physical inactivity, BMI, and arthritis (all p?<?0.05).

Conclusion

Depressive symptoms and sleep complaints share a range of correlates cross-sectionally and prospectively. These findings highlight the common comorbidity between depressive symptoms and sleep complaints underscoring the need for further research to understand their combined detrimental effect on long-term health and wellbeing.

     

Effects of Aquatic Exercise on Sleep in Older Adults with Mild Sleep Impairment: a Randomized Controlled Trial

Background

Exercise has been found to be associated with improved sleep quality. However, most of the evidence is based on resistance exercise, walking, or gym-based aerobic activity.

Purpose

This study aimed to examine the effects of an 8-week aquatic exercise program on objectively measured sleep parameters among older adults with mild sleep impairment.

Methods

A total of 67 eligible older adults with sleep impairment were selected and randomized to exercise and control groups, and 63 participants completed the study. The program involved 2?×?60-min sessions of aquatic exercise for 8 weeks. Participants wore wrist actigraphs to assess seven parameters of sleep for 1 week before and after the intervention. Mixed-design analysis of variance (ANOVA) was used to assess the differences between groups in each of the sleep parameters.

Results

No significant group differences on demographic variables, life satisfaction, percentage of body fat, fitness, seated blood pressure, and any parameter of sleep were found at baseline. Significant group?×?time interaction effects were found in sleep onset latency, F(1,58)?=?6.921, p?=?.011, partial eta squared?=?.011, and in sleep efficiency, F(1, 61)?=?16.909, p?<?0.001, partial eta squared?=?.217. The exercise group reported significantly less time on sleep onset latency (mean difference?=?7.9 min) and greater sleep efficiency (mean difference?=?5.9 %) than the control group at posttest. There was no significant difference between groups in change of total sleep time, wake after sleep onset, activity counts, or number and length of awakenings.

Conclusions

An 8-week aquatic exercise has significant benefits on some sleep parameters, including less time for sleep onset latency and better sleep efficiency in older adults with mild sleep impairment.

     

Psychosocial Quality-of-Life,Lifestyle and Adiposity: A Longitudinal Study in Pre-schoolers (Ballabeina Study)

Purpose

In obesity prevention, understanding psychosocial influences in early life is pivotal. Reviews reported contradictory results and a lack of longitudinal studies focusing on underlying lifestyle factors. This study tested whether psychosocial Quality-Of-Life (QOL) was associated with pre-schoolers’ lifestyle and adiposity changes over one school year and whether lifestyle moderated the latter. It was hypothesised that QOL might not impact adiposity in everybody but that this might depend on preceding lifestyle.

Method

Longitudinal data from 291 Swiss pre-schoolers (initially 3.9–6.3 years) was available. The following measures were used in longitudinal regressions: psychosocial QOL by PedsQL, adiposity (BMI z-score, waist, fat%), diet (food frequency), sedentary time and accelerometer-based activity.

Results

Concerning lifestyle, low psychosocial QOL was only related to unfavourable changes in diet (less fruit β?=?0.21 and more fat intake β?=??0.28) and lower physical activity (β?=?0.21). Longitudinal QOL-adiposity relations appeared only after moderation by lifestyle factors (beta-range 0.13–0.67). Low psychosocial QOL was associated with increased adiposity in children with an unhealthy diet intake or high sedentary time. By contrast, low psychosocial QOL was associated with decreasing adiposity in high fruit consumers or more physically active pre-schoolers.

Conclusion

Results emphasise the need for testing moderation in the QOL-adiposity relation. An unhealthy diet can be a vulnerability factor and high physical activity a protective factor in QOL-related adiposity. Consequently, QOL and lifestyle should be targeted concurrently in multi-factorial obesity prevention. The environment should be an ‘activity encouraging, healthy food zone’ that minimises opportunities for stress-induced eating. In addition, appropriate stress coping skills should be acquired.

     

Psychosocial and Clinical Correlates of Fatigue in Haemodialysis Patients: the Importance of Patients’ Illness Cognitions and Behaviours

Purpose

Fatigue is commonly experienced in end-stage kidney disease (ESKD) and is associated with poor outcomes. Currently, little research has examined the psychosocial correlates of fatigue severity and its impact on renal disease patients. We predicted that psychological factors (distress, cognitions and behaviours) would be associated with fatigue severity and impairment in ESKD patients even when controlling for clinical and disease factors.

Method

One hundred seventy-four haemodialysis patients completed the Chalder Fatigue Questionnaire (fatigue severity) and the Work and Social Adjustment Scale (fatigue-related impairment) in addition to measures evaluating distress, fatigue perceptions, symptom beliefs and behaviours. Demographic and clinical data were also collected.

Results

Fatigue severity was not related to haemoglobin levels, serum albumin or dialysis vintage. In hierarchical regression models, demographic and clinical factors explained 20 % of the variance in fatigue (ethnicity, body mass index, exercise, log C-reactive protein and multimorbidity). Psychological distress (beta?=?0.21, p?<?0.01), negative beliefs about fatigue (beta?=?0.10, p?=?0.01) and unhelpful behaviours (all-or-nothing behaviour [beta?=?0.28, p?<?0.01] and avoidance [beta?=?0.16, p?<?0.01]) explained an additional 36.4 % of the variance. Fatigue-related impairment was associated with psychological distress, perceptions that symptoms indicate damage, avoidance behaviour and the level of fatigue severity.

Conclusion

Patients’ mood, beliefs and behaviours are associated with fatigue in dialysis patients. Psychological interventions to alter these factors may reduce fatigue severity and fatigue-related disability in ESKD patients.

     

Health-Related Quality of Life in Adult Patients with Common Variable Immunodeficiency Disorders and Impact of Treatment

Purpose

Common variable immunodeficiency disorder (CVID) is a primary immunodeficiency disease (PIDD) often associated with severe and chronic infections. Patients commonly receive immunoglobulin (Ig) treatment to reduce the cycle of recurrent infection and improve physical functioning. However, how Ig treatment in CVID affects quality of life (QOL) has not been thoroughly evaluated. The purpose of a recent Immune Deficiency Foundation (IDF) mail survey was to assess the factors that are associated with QOL in patients with CVID receiving Ig treatment.

Methods

A 75-question survey developed by the IDF and a 12-item Short Form Health Survey (SF-12) to assess QOL were mailed to adults with CVID. Mean SF-12 scores were compared between patients with CVID and the general US adult population normative sample.

Results

Overall, 945 patients with CVID completed the surveys. More than half of the patients (54.9%) received intravenous Ig and 44.9% received subcutaneous Ig treatment. Patients with CVID had significantly lower SF-12 scores compared with the general US population regardless of sex or age (p < 0.05). Route of IgG replacement did not dramatically improve QOL. SF-12 scores were highest in patients with CVID who have well-controlled PIDD, lacked physical impairments, were not bothered by treatment, and received Ig infusions at home.

Conclusion

These data provide insight into what factors are most associated with physical and mental health, which can serve to improve QOL in patients in this population. Improvements in QOL can result from early detection of disease, limiting digestive system disease, attention to fatigue, and implementation of an individual treatment plan for the patient.

     

Sleep Quality in Ulcerative Colitis: Associations with Inflammation,Psychological Distress,and Quality of Life

Purpose

Treatment of ulcerative colitis (UC), given its chronicity and its associated disruptive and often distressing symptoms, is increasingly focusing on maximizing patient quality of life. Poorer quality of life has been found among patients with poor sleep quality, which is much more common in patients with UC than in the general population and may be associated with inflammation and psychological distress.

Method

Forty-seven patients with UC (n?=?11 flaring) completed measures of sleep quality, depression, state anxiety, gastrointestinal-related anxiety, perceived stress, and quality of life. Measures of inflammation were also obtained.

Results

Patients endorsed high rates of poor sleep quality, which was highly correlated with depression and poorer inflammatory bowel disease-related quality of life, but was generally not related to other areas of psychological functioning or inflammation. Sleep quality was significantly independently associated with depression and female gender.

Conclusion

Poor sleep quality is prevalent in patients with UC and is strongly related to depression, suggesting that sleep and mood are important areas to assess in patients with UC in order to inform tailored treatment to improve quality of life.

     

Predictors of obstructive sleep apnea

Background

A patient’s condition, such as obesity, plays a key role in the pathophysiology of obstructive sleep apnea (OSA). This study focuses on morphometric data that might be associated with the apnea–hypopnea index (AHI) and could therefore be used to predict OSA in order to better select patients for cardiorespiratory polysomnography (PSG).

Methods

Data of 110 patients with suspected OSA in the sleep center outpatient department were analyzed retrospectively. The data included morphometric measurements such as neck, waist, and hip circumference; weight; body size; age; and Epworth Sleepiness Scale (ESS). The results of the patients’ overnight polygraphy, the AHI, completed the data.

Results

Neck and waist circumference can predict the AHI (p < 0.01). Power of prediction was higher for both factors among male (p < 0.01) compared to female patients (p = 0.05). In the case of neck circumference, the threshold value is 40 cm. Neck circumferences of more than 40 cm are strongly associated with a higher AHI (p < 0.001).

Conclusion

It was possible to confirm the roles of waist and neck circumference as important parameters for a prediction model. Nevertheless, these parameters alone are not precise enough to completely neglect factors such as anatomic morphology in order to predict OSA and its severity.

     

Passive administration of purified secretory IgA from human colostrum induces protection against <Emphasis Type="Italic">Mycobacterium tuberculosis</Emphasis> in a murine model of progressive pulmonary infection

Background

Immunoglobulin A is the most abundant isotype in secretions from mucosal surfaces of the gastrointestinal, respiratory and genitourinary tracts and in external secretions such as colostrum, breast milk, tears and saliva. The high concentration of human secretory IgA (hsIgA) in human colostrum strongly suggests that it should play an important role in the passive immune protection against gastrointestinal and respiratory infections.

Materials and methods

Human secretory IgA was purified from colostrum. The reactivity of hsIgA against mycobacterial antigens and its protective capacity against mycobacterial infection was evaluated.

Results

The passive administration of hsIgA reduces the pneumonic area before challenge with M. tuberculosis. The intratracheal administration of M. tuberculosis preincubated with hsIgA to mice greatly reduced the bacterial load in the lungs and diminished lung tissue injury.

Conclusions

HsIgA purified from colostrum protects against M. tuberculosis infection in an experimental mouse model.

     

The host control of a clinical isolate strain of <Emphasis Type="Italic">P. aeruginosa</Emphasis> infection is independent of Nod-1 but depends on MyD88

Objective and design

The objective of this study was to investigate the role of Nod1 in the recruitment of neutrophils into the infection site and in the establishment of the inflammatory response elicited by a clinical isolate strain of P. aeruginosa in vivo, while comparing it to the well-established role of MyD88 in this process.

Subjects

Wild-type, Nod1^?/? and MyD88^?/? mice, all with a C57Bl/6 background.

Methods

Mice were intranasally infected with Pseudomonas aeruginosa DZ605. Bronchoalveolar lavage and blood were harvested 6 or 20 h post-infection for evaluating bacterial load, chemokine levels and neutrophil migration. Survival post-infection was also observed.

Results

We show here that wild-type and Nod1^?/? mice induce similar lung chemokine levels, neutrophil recruitment, and bacterial load, thus leading to equal survival rates upon P. aeruginosa pulmonary infection. Furthermore, we confirmed the essential role of MyD88-dependent signalling in recruiting neutrophils and controlling P. aeruginosa-induced pulmonary infection.

Conclusion

The results suggest that in contrast to MyD88, under our experimental conditions, the absence of Nod1 does not impair the recruitment of neutrophils in response to P. aeruginosa DZ605.

     

The alpha-lipoic acid derivative DHLHZn: a new therapeutic agent for acute lung injury in vivo

Objective and design

An animal experiment was performed to demonstrate the anti-inflammatory effects of an alpha-lipoic acid (ALA) derivative, dihydrolipoyl histidinate zinc complex (DHLHZn) for acute lung injury (ALI) and to investigate the mechanism of action.

Material

Rats were randomly divided into three experimental groups: control group (n = 17), DHLHZn(?) group (n = 11, ALI model rats), and DHLHZn(+) group (n = 12, ALI model rats treated by DHLHZn).

Treatment

Lipopolysaccharides (LPS, 10 mg/kg) were administered intratracheally in the DHLHZn(?) group and the DHLHZn(+) group. For the DHLHZn(+) group, DHLHZn (100 mg/kg) was administered intraperitoneally 2 h prior to LPS administration.

Methods

Four hours after LPS administration, bronchoalveolar lavage fluid (BALF) and lung tissue were collected. The findings were analyzed using the Mann–Whitney U test.

Results

Total number of cells, number of neutrophils and lymphocytes, levels of various inflammatory cytokines, and NF-kB p65 concentration of BALF were significantly lower in the DHLHZn(+) group than in the DHLHZn(?) group (p < 0.05). ALI pathology scores were significantly lower in the DHLHZn(+) group than in the DHLHZn(?) group (p < 0.001).

Conclusions

Anti-inflammatory effects of DHLHZn for ALI were demonstrated by BALF and histopathological findings. The mechanism of action of DHLHZn was considered to be via inhibition of the NF-kB signaling pathway. DHLHZn is thus suggested to be a new prophylactic agent for ALI.

     

Role of topoisomerase mutations,plasmid mediated resistance (<Emphasis Type="Italic">qnr</Emphasis>) and acrAB efflux pump in fluoroquinolone resistant clinical isolates of avian <Emphasis Type="Italic">Escherichia coli</Emphasis>

Introduction

We investigated the role of topoisomerase mutations, increased level of the multidrug efflux pump AcrAB, and the plasmid-borne genes (qnr) in the fluoroquinolone (FQ) resistant avian Escherichia coli simultaneously.

Material and method

Here, we used four FQs (ciprofloxacin, enrofloxacin, ofloxacin and pefloxacin) and eight clinical isolates of E. coli containing six fluoroquinolone-resistant and two fluoroquinolone- susceptible. PCR and direct sequencing methods were used to detect the role of regulator/ repressor gene (acrR).

Objective

The objective of this study was to determine the relationship of these resistance mechanisms for fluoroquinolone resistance.

Result

The results showed that (i) all four fluoroquinolone- resistant isolates have topoisomerase mutation and plasmid borne genes qnrS and aac(6')-Ib; (ii) three FQ (enrofloxacin, ofloxacin and pefloxacin) resistant isolates harboring qnrS genes; (iii) two FQ (ciprofloxacin and pefloxacin) resistant isolates had topoisomerase mutation and plasmid borne gene qnrS; (iv) all fluoroquinolone susceptible were not harboring qnrS gene and topoisomerase mutation (v) All isolates were negative for qnrA and qnrB.

Conclusion

We found that FQs resistance combination was correlated with synergistically contribution of these resistance mechanisms. Plasmid mediated resistance by qnrS was correlated to pefloxacin resistance but did not correlate to ofloxacin, enrofloxacin and ciprofloxacin. This mechanism might be account for the pefloxacin resistance in avian E. coli.

     

Picture perfect—how seeking perfection influences sleep and romantic relationships

Background

Studies have shown that sleep quality is negatively affected by perfectionism. Moreover, partner- or relationship-oriented perfectionism negatively influences relationship quality.

Objective

This paper aims to investigate the association of general perfectionism with sleep quality and relationship quality.

Materials and methods

A study assessing perfectionism, sleep quality, and relationship quality was performed via analyzing online questionnaires completed by 489 German adults from the general population.

Results

Participants with impaired sleep showed a higher level of maladaptive perfectionism (concern over mistakes and doubts, parental expectations, and criticism) than participants with good sleep, whereby the severity of sleep problems was not determining. Relationship quality is affected by perfectionism. However, this association is mediated by sleep quality.

Conclusion

Perfectionism is associated with worse sleep quality but not with worse relationship quality when sleep quality is integrated into the model as a mediator.

     

Antimicrobial activity of HL-60 cells compared to primary blood-derived neutrophils against <Emphasis Type="Italic">Staphylococcus aureus</Emphasis>

Background

The human leukemia cell line HL-60 is considered an alternative cell culture model to study neutrophil differentiation and migration. The aim of this study was to characterize the suitability of HL-60 cells differentiated to neutrophil-like cells (nHL-60) as substitute for blood-derived human neutrophils to investigate the interaction of neutrophils with Staphylococcus aureus.

Methods

For this purpose, antimicrobial activity, bacterial uptake, production of reactive oxygen species and the release of neutrophil extracellular traps (NETs) by nHL-60 cells were analyzed and compared to primary blood-derived neutrophils using Staphylococcus aureus as important human and animal pathogen.

Results

Overall, the antimicrobial activities of nHL-60 cells were distinctly lower compared to blood-derived neutrophils. Furthermore, production of reactive oxygen species as well as NET formation was clearly impaired in nHL-60 cells.

Conclusion

This study indicates that HL-60 cells are of limited usage as an alternative model to study antimicrobial functions of neutrophils against Staphylococcus aureus.

     

Predicting the potential global distribution of diosgenin-contained <Emphasis Type="Italic">Dioscorea</Emphasis> species

Background

Diosgenin, mainly extracted from wild diosgenin-contained Dioscorea species, is a well-known starting material of steroidal and contraceptive drugs. However, due to large market demand and increasingly ecological damage, wild Dioscorea species resources available have been gradually declining. Therefore, identification of new potential ecological distribution of diosgenin-contained Dioscorea species is necessary for diosgenin production.

Methods

In this study, a large occurrence dataset (1808 data points) of diosgenin-contained Dioscorea species was obtained from Eastern Asia, Southern North America and Southern Africa. Along with the data for six critical environmental parameters and one soil factor, Geographic Information System for Global Medicinal Plant was applied to predict the potential suitable distribution of Dioscorea species.

Results

The results showed that the potential distribution of these Dioscorea species covered a wide field, and that new ecological suitability areas were mainly distributed in the central region of South America, the southern part of the European and coastal region of Oceania. Jackknife test indicated that annual precipitation and annual mean radiation were the important climatic factors controlling the distribution of Dioscorea species.

Conclusions

The suitable areas and critical climatic factors will serve as a useful guide for diosgenin-contained Dioscorea species conservation and cultivation in ecological suitable areas.

     

Pam2CSK4 and Pam3CSK4 induce iNOS expression via TBK1 and MyD88 molecules in mouse macrophage cell line RAW264.7

Objective

The aim of this study was to investigate the involvement of TLR adaptor molecules, such as TRIF, MyD88, and TBK1 in the induction of iNOS and nitric oxide (NO) production in Pam2CSK4 and Pam3CSK4-treated mouse macrophages.

Method

Mouse macrophage cell line (RAW264.7) was transfected with trif, myd88, and tbk1 siRNAs before stimulated with Pam2CSK4 and Pam3CSK4. The iNOS gene and protein expression were determined by RT-PCR and immunoblotting, respectively. The NO production was determined by Griess reaction assay.

Results

The results showed that the induction of iNOS expression and NO production by Pam2CSK4 and Pam3CSK4 were diminished in tbk1 and myd88-depleted mouse macrophages but not trif-depleted cells.

Conclusion

These results suggested that the TBK1 and MyD88 molecules were essential for the induction of iNOS expression and NO production by both Pam2CSK4 and Pam3CSK4 via TLR2 signaling.

     

Through thick and thin?

Background

A good romantic relationship quality increases resilience against mental and physical health problems. Regarding correlates of relationship quality, research has focused mostly on attachment style and personality traits such as the Big Five.

Objective

The current study aims to find further predictors of a good relationship quality, such as sleep, demographics, and the boundary concept.

Materials and methods

For the study, 336 subjects were recruited, most of them women (79.76%). Only participants who were in a relationship were included in the analyses (N?=?216). The effects of sleep (Pittsburgh Sleep Quality Index, PSQI), demographics, and thin or thick boundaries (Boundary Personality Questionnaire, BPQ) on relationship quality (Partnerschaftsfragebogen—Kurzversion, PFB-K) were assessed using multiple regression.

Results

Age and thickness of boundaries were significantly connected with relationship quality. Sleep quality, gender, body mass index, and accommodation were not related to relationship quality.

Conclusion

The current study confirms the importance of age and provides new insight into the effects of boundaries in terms of relationship quality. Methodological limitations (e.g., homogenous and healthy sample) might compromise the findings regarding sleep. Future studies should include a more diverse sample and investigate further correlates of the boundary concept.

     

Glücklich als Paar – glücklicher Schlaf?

Background

Millions of people share a bed with their partner. Sleep und relationship could possibly influence each other.

Objectives

To identify and discuss connections between relationship and sleep quality.

Methods

Review of the literature in electronic databases.

Results

Conflict and violence in relationships lead to decreases in both partners’ sleep quality. Constructive approaches to resolving conflicts is necessary for good sleep, and vice versa. Women prefer partners with sleep-wake rhythms matching their own and report higher relationship satisfactions when the couple’s chronotypes are compatible.

Conclusions

Sleep and circadian rhythms play important roles in relationships. When treating insomnia, the relationship and the partner’s sleep should be taken into account.

     

Perseverative Cognition as an Explanatory Mechanism in the Relation Between Job Demands and Sleep Quality

Purpose

The aim of this longitudinal three-wave study was to examine (i) reciprocal associations among job demands, work-related perseverative cognition (PC), and sleep quality; (ii) PC as a mediator in-between job demands and sleep quality; and (iii) continuous high job demands in relation to sleep quality and work-related PC over time.

Method

A representative sample of the Swedish working population was approached in 2010, 2012, and 2014, and 2316 respondents were included in this longitudinal full-panel survey study. Structural equation modelling was performed to analyse the temporal relations between job demands, work-related PC, and sleep quality. Additionally, a subsample (N = 1149) consisting of individuals who reported the same level of exposure to job demands during all three waves (i.e. stable high, stable moderate, or stable low job demands) was examined in relation to PC and sleep quality over time.

Results

Analyses showed that job demands, PC, and poor sleep quality were positively and reciprocally related. Work-related PC mediated the normal and reversed, direct across-wave relations between job demands and sleep quality. Individuals with continuous high job demands reported significantly lower sleep quality and higher work-related PC, compared to individuals with continuous moderate/low job demands.

Conclusion

This study substantiated reciprocal relations between job demands, work-related PC, and sleep quality and supported work-related PC as an underlying mechanism of the reciprocal job demands-sleep relationship. Moreover, this study showed that chronically high job demands are a risk factor for low sleep quality.

     

LncRNA MEG3 impacts proliferation,invasion, and migration of ovarian cancer cells through regulating <Emphasis Type="Italic">PTEN</Emphasis>

Objective and design

We investigated the expressions of lncRNA MEG3 and PTEN in ovarian cancer tissues and their effects on cell proliferation, cycle and apoptosis of ovarian cancer.

Methods

Expression levels of MEG3 in ovarian cancer cell lines and normal ovarian cell lines were detected by qRT-PCR. Cell viability was detected by MTT assay. Cell apoptosis and cell cycle distribution were measured by flow cytometry. Cell invasion capability was tested by transwell assay. Cell migration capacity was tested by wound healing. The xenograft model was constructed to explore the effect of lncRNA MEG3 on ovarian cancer in vivo.

Result

Compared with normal ovarian cells, expression levels of MEG3 and PTEN were relatively lower in ovarian cancer cells. There was a positive correlation between the expression of PTEN and the expression of MEG3. Enhanced expression level of PTEN suppressed SKOV3 cell proliferation, increased cell apoptosis rate, and decreased cell invasion and migration.

Conclusion

LncRNA MEG3 and PTEN were down-regulated in ovarian cancer cells. LncRNA MEG3 regulated the downstream gene PTEN in ovarian cancer cells to prohibit cell proliferation, promote apoptosis and block cell cycle progression.

     

The effects of phosphanegold(I) thiolates on the biological properties of <Emphasis Type="Italic">Acanthamoeba castellanii</Emphasis> belonging to the T4 genotype

Background

Gold compounds have shown promise in the treatment of non-communicable diseases such as rheumatoid arthritis and cancer, and are considered of value as anti-microbial agents against Gram-negative and Gram-positive bacteria, and have anti-parasitic properties against Schistosoma mansoni, Trypanosoma brucei, Plasmodium falciparum, Leishmania infantinum, Giardia lamblia, and Entamoeba histolytica. They are known to affect enzymatic activities that are required for the cellular respiration processes.

Methods

Anti-amoebic effects of phosphanegold(I) thiolates were tested against clinical isolate of A. castellanii belonging to the T4 genotype by employing viability assays, growth inhibition assays, encystation assays, excystation assays, and zymographic assays.

Results

The treatment of A. castellanii with the phosphanegold(I) thiolates tested (i) had no effect on the viability of A. castellanii as determined by Trypan blue exclusion test, (ii) did not affect amoebae growth using PYG growth medium, (iii) did not inhibit cellular differentiation, and (iv) had no effect on the extracellular proteolytic activities of A. castellanii.

Conclusion

Being free-living amoeba, A. castellanii is a versatile respirator and possesses respiratory mechanisms that adapt to various aerobic and anaerobic environments to avoid toxic threats and adverse conditions. For the first time, our findings showed that A. castellanii exhibits resistance to the toxic effects of gold compounds and could prove to be an attractive model to study mechanisms of metal resistance in eukaryotic cells.