UNASSIGNED: Vertebral compression fractures (VFs) are a common and severe finding in patients with osteoporosis. In children, VFs have the unique potential to reshape and regain their original configuration. Spontaneous vertebral body reshaping (i.e., medication-unassisted) has been reported in secondary osteoporosis. Here we describe a previously unreported spontaneous vertebral reshaping in an adolescent with osteogenesis imperfecta (OI) with multiple vertebral fractures.
UNASSIGNED: A 17-year-old female was diagnosed with OI type I at 5 years of age caused by a novel frameshift variant in COL1A1 (NM_000088.4: c.540delC; p.Met181TrpfsTer84). Due to parental reservations about medication, she had never received bisphosphonate or any other bone active therapy. A lateral spine X-ray demonstrated transparent bones and no VF. However, previous spine X-rays taken at age of 6 years at an external institution showed VFs in T5-7 (Genant semiquantitative method grade I-II). The two lateral spine x-rays, taken 11 years apart, demonstrate that substantial spontaneous vertebral reshaping occurred without bone active therapy during puberty.
UNASSIGNED: Vertebral reshaping is explained by the stabilization of bone mineral density (BMD) and the remaining growth capacity the children. We hypothesize that spontaneous reshaping may occur in milder forms of OI, and that puberty may be a key mediator of the phenomenon. In all children with OI and vertebral fractures, we nevertheless recommend bisphosphonate therapy since it improves bone mass, BMD, vertebral shape, physical activity and reduces fracture rates.

Male and female mice with a dominant severe bone fragility disorder, osteogenesis imperfecta, and their wild-type littermates (FVB background) were challenged with a long-term (26 weeks) high-fat diet to evaluate the development of obesity and glucose intolerance. Here we present data for the measurements of body mass, the outcome of glucose tolerance tests during the long-term diet, as well as organ weights and bone phenotype at the end of the study. Interpretation of the data and further in-depth analysis can be found in the article \"Male but not female mice with severe osteogenesis imperfecta are partially protected from high-fat diet-induced obesity.\" by Tauer JT, Boraschi-Diaz I, Al Rifai O, Rauch F, Ferron M, Komarova SV, published in Molecular Genetics and Metabolism. The data presented here demonstrate individual mouse outcomes of long-term diet experiments that can be reused for comparative studies of diet-induced changes in wild-type mice on different backgrounds and different mouse models of osteogenesis imperfecta.

A young female with pulmonary congestion suspected to be secondary to mitral valve disease with left atrial appendage thrombus was given therapy for heart failure and anticoagulation. Subsequent multimodality imaging with echocardiography and magnetic resonance imaging established an accurate but rare diagnosis of spindle cell sarcoma of the heart. (Level of Difficulty: Intermediate.).

暂无摘要。

The extracellular matrix is engaged in an ever-evolving and elegant ballet of dynamic reciprocity that directly and bi-directionally regulates cell behavior. Homeostatic and pathophysiological changes in cell-matrix signaling cascades manifest as complex matrix phenotypes. Indeed, the extracellular matrix can be implicated in virtually every known human disease, thus, making it the most critical and dynamic \"organ\" in the human body. The overall goal of this Special Issue is to provide an accurate and inclusive functional definition that addresses the inherent complexity of matrix phenotypes. This goal is summarily achieved via a corpus of expertly written articles, reviews and original research, focused at answering this question empirically and fundamentally via state-of-the-art methods and research strategies.

Classical osteogenesis imperfecta (OI) is an inherited rare brittle bone disease caused by dominant mutations in the COL1A1 or COL1A2 genes, encoding for the α chains of collagen type I. The definitive cure for the disease will require a gene therapy approach, aimed to correct or suppress the mutant allele. Interestingly, individuals lacking α2(I) chain and synthetizing collagen α1(I)3 homotrimers do not show bone phenotype, making appealing a bone specific COL1A2 silencing approach for OI therapy. To this aim, three different Col1a2-silencing RNAs (siRNAs), -3554, -3825 and -4125, selected at the 3\'-end of the murine Col1a2 transcript were tested in vitro and in vivo. In murine embryonic fibroblasts Col1a2-siRNA-3554 was able to efficiently and specifically target the Col1a2 mRNA and to strongly reduce α2(I) chain expression. Its efficiency and specificity were also demonstrated in primary murine osteoblasts, whose mineralization was preserved. The efficiency of Col1a2-siRNA-3554 was proved also in vivo. Biphasic calcium phosphate implants loaded with murine mesenchymal stem cells were intramuscularly transplanted in nude mice and injected with Col1a2-siRNA-3554 three times a week for three weeks. Collagen α2 silencing was demonstrated both at mRNA and protein level and Masson\'s Trichrome staining confirmed the presence of newly formed collagen matrix. Our data pave the way for further investigation of Col1a2 silencing and siRNA delivery to the bone tissue as a possible strategy for OI therapy.

Very few cases of simultaneous occurrence of tibial tuberosity fracture with lower pole patella and distal patellar tendon rupture type injuries have been reported in adolescent athletic age group, but its occurrence in osteogenesis imperfecta (OI)* has not been reported to the best of our knowledge in a literature search of last 5 years in the English Language. The mechanism of avulsion injury after low-velocity trauma and the underlying pathology is a unique combination in our patient and a note on updates in general management of osteogenesis imperfecta is discussed.