Gaucher's Disease at a National Referral Hospital

Objectives: To determine the prevalence and to characterise Gaucher\'s disease in terms of socio-demographic data, clinical presentation, and management as seen at Kenyatta National Hospital. Design: A retrospective record based study. Setting: Kenyatta National Hospital, a referral and teaching hospital. Main outcome measures: Prevalence (number of cases seen a year), of Gaucher\'s disease, sociodemographic data, clinical presentation, mode of diagnosis and treatment modalities of Gauchers disease. Results: Nine patients were studied, four males and five females giving a prevalence of 0.9 cases seen a year and a M:F ratio of about 1:1. The most common presentation was splenomegaly in nine (100%) cases and hepatomegaly in seven (78%) patients, neurological and bone symptoms were rare, in one (11%) cases and in two (22%) cases respectively. Diagnosis was mainly on basis of presence of Gaucher cells in bone marrow and splenic aspirate as enzyme assay was unavailable. Management was mainly supportive and enzyme therapy was only available for two (22%) patients. Anaemia was the most common complication with seven (78%) patients and one death occurred due to osteomyelitis. Only four (44%) patients were followed up for a period of four years. Conclusions: Gaucher\'s disease is a rare condition at the Kenyatta National Hospital (KNH). The presentation of most patients is organomegaly, (hepatosplenomegaly) and best fits the type 1 or non-neuronopathic Gaucher\'s disease. Neurological manifestations are rare. Management of this condition at the KNH is mainly supportive and enzyme therapy still remains out of reach for most patients

On the dynamics of the adenylate energy system: homeorhesis vs homeostasis.

Biochemical energy is the fundamental element that maintains both the adequate turnover of the biomolecular structures and the functional metabolic viability of unicellular organisms. The levels of ATP, ADP and AMP reflect roughly the energetic status of the cell, and a precise ratio relating them was proposed by Atkinson as the adenylate energy charge (AEC). Under growth-phase conditions, cells maintain the AEC within narrow physiological values, despite extremely large fluctuations in the adenine nucleotides concentration. Intensive experimental studies have shown that these AEC values are preserved in a wide variety of organisms, both eukaryotes and prokaryotes. Here, to understand some of the functional elements involved in the cellular energy status, we present a computational model conformed by some key essential parts of the adenylate energy system. Specifically, we have considered (I) the main synthesis process of ATP from ADP, (II) the main catalyzed phosphotransfer reaction for interconversion of ATP, ADP and AMP, (III) the enzymatic hydrolysis of ATP yielding ADP, and (IV) the enzymatic hydrolysis of ATP providing AMP. This leads to a dynamic metabolic model (with the form of a delayed differential system) in which the enzymatic rate equations and all the physiological kinetic parameters have been explicitly considered and experimentally tested in vitro. Our central hypothesis is that cells are characterized by changing energy dynamics (homeorhesis). The results show that the AEC presents stable transitions between steady states and periodic oscillations and, in agreement with experimental data these oscillations range within the narrow AEC window. Furthermore, the model shows sustained oscillations in the Gibbs free energy and in the total nucleotide pool. The present study provides a step forward towards the understanding of the fundamental principles and quantitative laws governing the adenylate energy system, which is a fundamental element for unveiling the dynamics of cellular life

Dosage effect of zero to three functional LBR-genes in vivo and in vitro

The Lamin B receptor (LBR) is a pivotal architectural protein in the nuclear envelope. Mutations in the Lamin B receptor lead to nuclear hyposegmentation (Pelger-Huët anomaly). We have exactly quantified the nuclear lobulation in neutrophils from individuals with 0, 1, 2 and 3 functional copies of the lamin B receptor gene and analyzed the effect of different mutation types. Our data demonstrate that there is a highly significant gene-dosage effect between the gene copy number and the nuclear segmentation index of neutrophils. This finding is paralleled by a dose-dependent increase in LBR protein and staining intensity of the nuclear membrane in corresponding lymphoblastoid cell lines, which demonstrates a significant correlation on the protein level as well. We further show that LBR expression continually increases during granulopoiesis in vitro from human precursor cells with ovoid nuclei to multi-segmented neutrophil nuclei 11 days later, indicating relevance for regular human granulopoiesis. Altogether, LBR is a unique model that will allow the systematic study of gene-dosage effects and of modifying endogeneous and exogeneous factors on granulopoiesis

Perioperative care of children with sickle cell disease: a systematic review and clinical recommendations.

Children with sickle cell disease (SCD) require specific perioperative care, and clinical practice in this area remains poorly defined. We aimed to a) conduct a systematic, PRISMA-based review of the literature and any available clinical guidelines, practice recommendations, and extract any valuable information for the "best of available-evidence"-based prevention of perioperative adverse events in children with SCD, b) highlight the most urgent priorities in clinical research. As data sources, US National Library of Medicine, Medline, National Guideline Clearinghouse, International Guideline Network, TRIP databases were searched for any content until January 2019. We also included institutional, consortia and expert group guidelines. Included were reports/guidelines in English, French, German, Italian. Excluded were reports on obstetrical and fetal management. We identified 202 reports/guidelines fulfilling the criteria outlined above. A majority focused on visceral, cardiovascular and orthopedic surgery procedures, and only five were multicenter randomized controlled trials and two prospective randomized studies. After grading of quality of evidence, the extracted data was summarized into clinical recommendations for daily practice. Additionally, we designed a risk-grading algorithm to identify contexts likely to be associated with adverse outcomes. In conclusion, we provide a systematic PRISMA-based review of the existing literature and any ancillary practice and delineate a set of clinical recommendations and priorities for research. This article is protected by copyright. All rights reserved