The role of membrane trafficking and retromer complex in Parkinson's and Alzheimer's disease.

Membrane trafficking is a physiological process encompassing different pathways involved in transporting cellular products across cell membranes to specific cell locations via encapsulated vesicles. This process is required for cells to mature and function properly, allowing them to adapt to their surroundings. The retromer complex is a complex composed of nexin proteins and peptides that play a vital role in the endosomal pathway of membrane trafficking. In humans, any interference in normal membrane trafficking or retromer complex can cause profound changes such as those seen in neurodegenerative disorders such as Alzheimer's and Parkinson's. Several studies have explored the potential causative mechanisms in developing both disease processes; however, the role of retromer trafficking in their pathogenesis is becoming increasingly significant with promising therapeutic applications. This manuscript describes the processes involved in membrane transport and the roles of the retromer in the onset and progression of Alzheimer's and Parkinson's. Moreover, we will also explore how these aberrant mechanisms may serve as possible avenues for treatment development in both diseases and the prospect of its future application.

Validity of "Mid-Upper Arm Circumference" as a Parameter to Identify Undernourished Children in Rural Gujarat.

Introduction: Mid-upper arm circumference (MUAC) measures the arm muscle and fat area. The use of MUAC as a screening measure for assessing undernutrition has the following advantages; it makes use of a simple equipment, is easy to carry at the field sites, and requires minimal training. In India, "mid-upper arm circumference" is widely used and accepted in many nutritional programs. Objectives: This study was conducted with the primary objective to compare different anthropometric parameters of children and to validate the usefulness and limitations of MUAC to screen out undernourished children. Subject and Methods: Anthropometric measurements were recorded for all the anganwadi centers of the selected sub-center that comes under the field practice area of our department. The measurements like weight, height, MUAC were done according to the standard guidelines as per WHO, and further, calculations were done with the help of "Anthro software 3.2.2." Comparisons were done between categorization of MUAC tape and Weight-for-Height Z-scores (WHZ), and hence, the sensitivity and specificity of the MUAC tape to screen the malnourished child were found out. Results: Sensitivity of MUAC to categorize a child in red/yellow was only 9.03%, negative predictive value (NPV) was 40.75%, specificity came 95.10%, and positive predictive value was 73.68% on taking WHZ as the gold standard. Conclusion: MUAC has a limited role in screening out an undernourished child (red/yellow category), whereas it has a good role in screening healthy children (green category).