Archives of Medical Research最新文献

Background

The optimal dose of rabbit anti-thymocyte globulin (r-ATG) in renal transplantation is still under debate. We previously reported that a low-dose r-ATG induction of 3 mg/kg can be used safely and effectively in low-risk kidney transplants with good results in the first year after transplantation compared to basiliximab induction.

Aims

The purpose of this study is to evaluate the long-term impact of this trial of low-dose r-ATG versus basiliximab on post-transplant outcomes (patient and graft survival, biopsy-proven acute rejection incidence [BPAR], infectious complications, and side effects).

Methods

Observational study (three-year follow-up) of a 12-month single-center, open-label RCT in de novo kidney allograft recipients assigned to receive either thymoglobulin or basiliximab before transplantation.

Results

Patients in the basiliximab group (BG) underwent more kidney transplant biopsies than patients in the low-dose r-ATG group (TG) (50 vs. 31.8%, p = 0.07). Although the 12-month cumulative incidence of BPAR was lower in BG, by the end of the three-year follow-up period this incidence was higher (22%) than in the low-dose TG (15%) (p = ns). Steroids were withdrawn more frequently in the TG group and sirolimus was most frequently indicated. Graft function and graft survival were higher in the low-dose TG than in the BG at three-year follow-up but not statistically significant. Patient survival was similar between groups (>90%).

Conclusions

These three-year follow-up data confirm the efficacy and favorable safety aspects of the low-dose r-ATG (3 mg/kg) in low-risk kidney transplantation.

Background

Elder abuse (EA), depressive symptoms, and loneliness represent a growing risk to the health, well-being, and premature mortality of older adults. However, the role of loneliness in the relationship between EA and depressive symptoms has not yet been examined.

Aims

To investigate the associations between these constructs and to explore the possible mediating role of loneliness in the relationship between EA and depressive symptoms in a representative sample of older Mexican people.

Methods

A representative community-dwelling survey of older adults aged 60 and older was conducted in two cities in Mexico (Mexico City and Xalapa) in 2018–2019. Measurements of EA, loneliness, depressive symptoms, health, and sociodemographic data were collected. Regression and mediation models were tested to analyze the associations between these variables.

Results

The prevalence of EA was 16.3%, loneliness was 50%, and depressive symptoms were 25.5%. The odds ratio (OR) for the occurrence of depressive symptoms was 2.7 when the combined effects of EA and loneliness were considered. The proportion of the effect that could explain the mediating role of loneliness was 31%.

Conclusion

To effectively reduce depressive symptoms in older individuals affected by emotional or psychological abuse and neglect, it is crucial to address both the mediating influence of loneliness and EA itself in therapeutic and preventive interventions.

Background and Aims

This study aimed to quantify adverse perinatal outcomes (APO), including small/large for gestational age (SGA/LGA) and preterm birth (PTB), in pregnant women with abnormal red cell distribution width (RDW) and explore the related mechanisms.

Methods

This study included 11,659 pregnant women who delivered in a specialized hospital. At the time of admission, the lipid profiles and whole blood cell counts were assessed, and APO was analyzed.

Results

Women with high RDW (>18.5% [the 97.5^th percentile]) in late pregnancy had a higher risk of LGA compared with those with low RDW (<12.3% [the 2.5^th percentile]), whereas women with low RDW had a higher risk of SGA and PTB, compared with those with high RDW. A 1% increase in RDW was associated with an increased risk of LGA and a decreased risk of SGA and PTB. Consistent associations were observed in sensitivity analysis among pregnant women of non-advanced age, non-obesity, non-pregnancy complications, and non-PTB (for SGA/LGA only). Increased RDW was significantly associated with increased triglycerides and decreased high-density lipoprotein cholesterol (HDL-C). Triglycerides and HDL-C significantly mediated 10.63 and 15.8% of RDW-associated LGA, 9.51% and 9.40 of RDW-associated SGA, and 8.44 and –8.25% of RDW-associated PTB, respectively.

Conclusion

Abnormal RDW was associated with an increased risk of APO, and the RDW-associated APO risk could be partially mediated by triglycerides and HDL-C, suggesting that RDW may be a promising APO predictor.

Background

Given the importance of understanding psychosocial well-being as part of aging characteristics and processes, the present study aimed to describe life satisfaction among middle-aged and older adults in Mexico, according to sociodemographic, economic, psychosocial, and health factors.

Methods

Data were obtained from the Mexican Health and Aging Study (MHAS), a longitudinal, nationally representative survey of adults aged 50 years and older. Data from the 2012, 2015, and 2018 waves were analyzed for this study. Life satisfaction in the MHAS is assessed using the Spanish version of the Satisfaction with Life Scale (SWLS). For the construction of the trajectories over six years of follow-up, quartiles of the scale were calculated for each wave. Multinomial regression models were then estimated to determine significant factors associated with each trajectory.

Results

A total of 8,376 individuals aged 50 years and older met our study criteria for complete data in the three follow-up waves. Four life satisfaction trajectories were identified over six years of follow-up: high-constant, high-low, low-high, and low-constant. Subjective or psychosocial characteristics such as depressive symptoms, self-reported health, and functional ability were highly significant factors associated with life satisfaction trajectories, while multimorbidity was not significant.

Conclusions

This research contributes to the understanding of psychosocial well-being in Mexican older adults by exploring life satisfaction trajectories and their associated factors. The study shows that psychosocial and economic factors, along with functional abilities, have a much greater impact on life satisfaction, beyond the presence of comorbidity.

Background

Excessive expression of hemoglobin F (HbF) is a characteristic feature and important diagnostic marker of β⁰-thalassemia/HbE disease. However, some patients may exhibit low-HbF levels, leading to misdiagnosis and precluding genetic counseling. The genetic factors influencing these differences in HbF expression in this atypical disease are not completely understood.

Aims

To investigate determinants contributing to the non-elevation of HbF expression in β⁰-thalassemia/HbE disease.

Methods

We studied 231 patients with β⁰-thalassemia/HbE confirmed by DNA analysis; classified them into the low-HbF (n = 62) and high-HbF (n = 169) groups; analyzed hematological parameters and hemoglobin levels in both groups; and characterized mutations in β- and α-globin genes and genetic variants in γ-globin promoters.

Results

Both groups showed similar rates of type β⁰-thalassemia mutations but significantly different proportions of α-globin mutations: approximately 88.7% (95% confidence interval [CI] = 66.8–115.5) and 39.1% (95% CI = 30.2–49.7) in the low- and high-HbF groups, respectively. The results revealed single-nucleotide polymorphisms (SNPs) at -158 (C>T) in the ^Gγ-globin promoters and novel SNPs at the 5′ untranslated region position 25 (G>A) in ^Aγ-globin promoters. The distribution of CC genotypes of the ^Gγ-globin promoter in the low-HbF group was significantly higher than that in the high-HbF group.

Conclusions

Cases with HbE predominance with low-HbF levels and undetectable HbA may not be as conclusive as those with homozygous HbE until DNA analysis is performed. Concomitant inheritance of α-thalassemia is an important inherent factor modifying HbF expression in a typical β⁰-thalassemia/HbE, and SNPs with the CC genotype in the ^Gγ-globin promoter may indicate unelevated HbF expression in patients with this disease.

Background

Prolonged hospitalization due to the COVID-19 pandemic gathered risk factors for developing invasive candidiasis.

Aim

To describe Candida spp. isolated from patients with clinical suspicion of COVID treated in a public hospital specialized in COVID-19 during the pandemic, considering the susceptibility profiles and the risk factors related to the species detected in a positive yeast culture.

Methods

From different samples of 33 patients with comorbidities, 42 clinical isolates were identified by VITEK^Ⓡ MS Plus. Antifungal susceptibility testing was performed using VITEK^Ⓡ 2 Compact with the AST-YS08 card.

Results

The most frequently identified species were C. albicans and C. glabrata, which were also the most common co-infections, Saprochaete capitata, an uncommon yeast was isolated in one patient. 85% of the co-infections were COVID positive and 100% of patients with a co-infection required mechanical ventilation (MV) which has been described as one of the major predisposing factors to candidiasis. Candida species vary in their response to treatment. In this study, 44% of isolates identified as C. glabrata were fluconazole-resistant, which were also immediately susceptible to caspofungin; this profile limits therapeutic options and emphasizes the importance of evaluating the susceptibility profile.

Conclusions

This work highlights the increase in isolation of different Candida species during COVID-19 and the importance of establishing criteria to declare Candida colonization or infection and the correct etiological identification to establish an agent-based antifungal treatment, to reduce the spreading risk of Candida spp. in the hospital environment, mortality, time, and cost of hospitalization.

Background

The aging population prompts studying risk factors and markers to predict healthy aging. Telomere length is a promising candidate for assessing various age-related traits.

Aim of the study

To investigate the association between physical performance and telomere length.

Methods

We enrolled 323 older Mexican adults from the “Cohort of Obesity, Sarcopenia, and Frailty of Older Mexican Adults” affiliated with the Instituto Mexicano del Seguro Social and assessed their physical performance using the Short Physical Performance Battery, dividing participants into low (≤7) and high (>7) groups. Absolute telomere length was determined by qPCR, and individuals were classified into short (≤4.22 kb) and long (>4.22 kb) groups. We calculated the mean and adjusted mean, considering sex and age, among others, with 95% CI. We estimated the effect size between physical performance and telomere length using Cohen's d for unequal group sizes and calculated the odds ratio for physical performance based on telomere length.

Results

Participants with low physical performance had significantly shorter telomeres (mean _4.14.4_4.7 kb, adjusted mean _3.54.0_4.5 kb, p <0.001), while those with high physical performance exhibited longer telomeres (mean _5.55.7_5.9 kb, adjusted mean _4.75.3_5.8 kb, p <0.001), with a medium-to-high telomere length effect size (d = 0.762). The odds of low physical activity increased _2.13.6_6.1-fold per kb of telomere attrition (adjOR _1.73.3_6.3, p <0.001).

Conclusion

Decreased physical function is associated with shorter telomere length. Absolute telomere length presents a promising biomarker for distinguishing between healthy and unhealthy aging, warranting further investigation.

Umbilical cord blood (UCB) is a rich source of hematopoietic stem and progenitor cells that are biologically superior to their adult counterparts. UCB cells can be stored for several years without compromising their numbers or function. Today, public and private UCB banks have been established in several countries around the world. After 35 years since the first UCB transplant (UCBT), more than 50,000 UCBTs have been performed worldwide. In pediatric patients, UCBT is comparable to or superior to bone marrow transplantation. In adult patients, UCB can be an alternative source of hematopoietic cells when an HLA-matched unrelated adult donor is not available and when a transplant is urgently needed. Delayed engraftment (due to reduced absolute numbers of hematopoietic cells) and higher costs have led many medical institutions not to consider UCB as a first-line cell source for hematopoietic transplants. As a result, the use of UCB as a source of hematopoietic stem and progenitor cells for transplantation has declined over the past decade. Several approaches are being investigated to make UCBTs more efficient, including improving the homing capabilities of primitive UCB cells and increasing the number of hematopoietic cells to be infused. Several of these approaches have already been applied in the clinic with promising results. UCB also contains immune effector cells, including monocytes and various lymphocyte subsets, which, together with stem and progenitor cells, are excellent candidates for the development of cellular therapies for hematological and non-hematological diseases.

Leishmaniasis is a relevant disease worldwide due to its presence in many countries and an estimated prevalence of 10 million people. The causative agent of this disease is the obligate intracellular parasite Leishmania which can infect different cell types. Part of its success depends on its ability to evade host defense mechanisms such as apoptosis. Apoptosis is a finely programmed process of cell death in which cells silently dismantle and actively participate in several processes such as immune response, differentiation, and cell growth. Leishmania has the ability to delay its initiation to persist in the cell. It has been well documented that different Leishmania species target different pathways that lead to apoptosis of cells such as macrophages, neutrophils, and dendritic cells. In many cases, the observed anti-apoptotic effect has been associated with a significant reduction in caspase-3 activity. Leishmania has also been shown to target several pathways involved in apoptosis such as MAPK, PI3K/Akt, and the antiapoptotic protein Bcl-xL. Understanding the strategies used by Leishmania to subvert the defense mechanisms of host cells, particularly apoptosis, is very relevant for the development of therapies and vaccines. In recent years, the drug artemisinin has been shown to be effective against several parasitic diseases. Its role against Leishmania may be promising. In this review, we provide important aspects of the disease, the strategies used by the parasite to suppress apoptosis, and the role of artemisinin in Leishmania infection.