Are filtered plasma proteins processed in the same way by the kidney?
| Autor: | Wayne D. Comper, Leileata M. Russo, J. Vuchkova |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Statistics and Probability medicine.medical_specialty 030232 urology & nephrology Kidney General Biochemistry Genetics and Molecular Biology 03 medical and health sciences Hypoproteinemia 0302 clinical medicine Internal medicine medicine Albuminuria Animals Humans Receptor Dent Disease Proteinuria General Immunology and Microbiology Chemistry Applied Mathematics Albumin Blood Proteins General Medicine Cubilin medicine.disease Blood proteins Rats Molecular Weight 030104 developmental biology Endocrinology medicine.anatomical_structure Modeling and Simulation medicine.symptom General Agricultural and Biological Sciences |
| Zdroj: | Journal of Theoretical Biology. 410:18-24 |
| ISSN: | 0022-5193 |
| DOI: | 10.1016/j.jtbi.2016.09.013 |
| Popis: | In order to understand the mechanism of albuminuria we have explored how other plasma proteins are processed by the kidney as compared to inert molecules like Ficolls. When fractional clearances are plotted versus protein radius there is a remarkable parallelism between protein (molecular weight range 30-150kDa) clearance in healthy controls, in Dent's disease, in nephrotic states and the clearance of Ficolls. Although there are significant differences in the levels of fractional clearances in these states. Dent's disease results in a 2-fold increase in the fractional clearance of proteins as compared to healthy controls whereas in nephrotic states there is a further 3-fold increase in fractional clearance. Previous thinking that albumin uptake was controlled primarily by the megalin/cubilin receptor does not explain the albumin urinary excretion data and is therefore an incorrect concept. Protein clearance in nephrotic states approach the fractional clearance of inert Ficolls for a given radius. It therefore appears that there are two pathways processing these proteins. A low capacity pathway associated with megalin/cubilin that degrades filtered protein (that is inhibited in Dent's disease) and a high capacity pathway that retrieves the filtered protein and returns it to the blood supply (without retrieval nephrotic protein excretion will occur and this will account for hypoproteinemia). On the other hand low molecular weight proteins ( |
| Databáze: | OpenAIRE |
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