Pathophysiology and clinical manifestations of osteoporosis

Dietary Protein Intake in Relation to the Risk of Osteoporosis in Middle-Aged and Older Individuals: A Cross-Sectional Study

OBJECTIVES

Dietary protein intake is of great significance for the bone health of middle-aged and elderly people. This study is aimed to explore the relationships between dietary protein intake and the risk of osteoporosis in middle-aged and older individuals among US population.

METHODS

Based on the National Health and Nutrition Examination Survey (NHANES), this study includes a total of 20497 participants during 2005-2008, and identify 4707 middle-aged and older people aged 45 years or above. Demographic data and relevant dietary intake information are acquired through in-home management questionnaires. The logistic regression models are established to identify the odds ratio (OR) and 95% confidence interval (CI) of OP in each quartile category of energy-adjusted dietary protein intake. The receiver operating characteristic (ROC) curve is applied to explore the optimal cut-off value of daily dietary protein intake for predicting risk of OP.

RESULTS

442 participants with OP are identified among 4707 middle-aged and older people, and the dietary protein intake of OP group is significantly lower than that of non-OP group (P<0.001). The logistic regression analysis shows that with the increase of daily dietary protein intake, the prevalence of OP in each quartile category decreases gradually (P<0.001). This trend is not altered in univariate model (P<0.001), as well as the adjustments for the covariates of age and BMI (Model 1, P<0.001), the covariates of sex (Model 2, P=0.036), the covariates of smoking, drinking alcohol, education, ratio of family income to poverty, hypertension and diabetes (Model 3, P<0.001), and the covariates of dietary intake (Model 4, P=0.008). Moreover, we also identify that the daily dietary protein intake of 61.2g is the optimal cut-off value for predicting risk of OP.

CONCLUSION

In general, among US population, the lower daily dietary protein intake is positively related to the ascending risk of OP in middle-aged and older individuals.

Potential Role of Lycopene in the Prevention of Postmenopausal Bone Loss: Evidence from Molecular to Clinical Studies

Osteoporosis is a metabolic bone disease characterized by reduced bone mineral density, which affects the quality of life of the aging population. Furthermore, disruption of bone microarchitecture and the alteration of non-collagenous protein in bones lead to higher fracture risk. This is most common in postmenopausal women. Certain medications are being used for the treatment of osteoporosis; however, these may be accompanied by undesirable side effects. Phytochemicals from fruits and vegetables are a source of micronutrients for the maintenance of bone health. Among them, lycopene has recently been shown to have a potential protective effect against bone loss. Lycopene is a lipid-soluble carotenoid that exists in both all-trans and cis-configurations in nature. Tomato and tomato products are rich sources of lycopene. Several human epidemiological studies, supplemented by in vivo and in vitro studies, have shown decreased bone loss following the consumption of lycopene/tomato. However, there are still limited studies that have evaluated the effect of lycopene on the prevention of bone loss in postmenopausal women. Therefore, the aim of this review is to summarize the relevant literature on the potential impact of lycopene on postmenopausal bone loss with molecular and clinical evidence, including an overview of bone biology and the pathophysiology of osteoporosis.

The Potential Influence of Bone-Derived Modulators on the Progression of Alzheimer's Disease

Bone, the major structural scaffold of the human body, has recently been demonstrated to interact with several other organ systems through the actions of bone-derived cells and bone-derived cell secretory proteins. Interestingly, the brain is one organ that appears to fall into this interconnected network. Furthermore, the fact that osteoporosis and Alzheimer's disease are two common age-related disorders raises the possibility that these two organ systems are interconnected in terms of disease pathogenesis. This review focuses on the latest evidence demonstrating the impact of bone-derived cells and bone-derived proteins on the central nervous system, and on how this may be relevant in the progression of Alzheimer's disease and for the identification of novel therapeutic approaches to treat this neurodegenerative disorder.

Simple and fast diagnosis of osteoporosis based on UV-visible hair fluorescence spectroscopy

The aim of this work is to propose a new analytical technique based on UV-visible fluorescence as an alternative to x-ray absorptiometry for diagnosing osteoporosis, as well as its early stage by identifying osteopenia. The equipment used consists of very cheap equipment compared to x-ray scanners with an LED as the excitation source. In this work, we analyzed 90 hair samples taken from volunteers of different ages at Habib Thameur Hospital in Tunis. These samples were previously analyzed by bone mineral density (BMD) and correspond to people suffering from osteoporosis and osteopenia, as well as healthy people. The main idea of this study is to show the correlation between the deficiency of bone density given by BMD and the variations of the relative concentrations of molecules present in the hair causing the changes observed in the fluorescence spectra. The results extracted from the spectra show a clear discrimination between healthy and sick patients and a very good correlation, in a Spearman sense, between the spectral measurements and the BMD's data for the patients with osteoporosis. In addition, we have isolated the main spectral region responsible for this correlation, which facilitates the identification of the molecule concentrations related to the decrease in BMD.

Prevalence of thoracic vertebral fractures in Spanish patients hospitalized in Internal Medicine Departments. Assessment of the clinical inertia. (PREFRAMI study)

PURPOSE

To study the prevalence of vertebral fractures (VF), the associated risk factors and the degree of diagnosis and prescription upon discharge in a series of hospitalized medical patients ≥50 years of age.

METHODS

A cross-sectional, multicentre and observational study in which a prevalence cut-off was carried out concerning patients admitted to six Internal Medicine departments in Malaga (Spain). The main variables were the existence of a fracture in the spine lateral x-ray, the inclusion of the diagnosis of a fracture in the discharge report, and the establishment of anti-osteoporotic treatment at discharge.

RESULTS

254 patients were included (mean age 66.4±14.9 years). The prevalence of VF was of 14.2% (36 cases). Patients with VF presented with a higher mean age, compared to those without VF (70.14 vs. 65.7 years) (p=0.035). The means contrast for the FRAX index variable (major osteoporotic and hip fracture), grouping according to the presence of VF, did not show any statistical significance (p=0.369 and p=0.788, respectively). Only in 8.3% of the discharge reports of patients with VF had the diagnosis of VF and/or osteoporosis been recorded and the prescription of anti-osteoporotic drugs been included.

CONCLUSIONS

A high prevalence of asymptomatic VF is verified in medical inpatients ≥50 years of age. The FRAX index did not turn out to be predictive of the presence of VF in this population. There is an underdiagnosis of osteoporotic VF in the coding at hospital discharge. Action protocols are necessary to avoid clinical inactivity regarding this entity.