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Neonatal and adult patterns of lectin binding to rat small intestinal microvillus membranes
M Stern1, B Gellermann, I Schall
1Universitäts-Kinderkliniken Hamburg, FRG.
Abstract:
To investigate postnatal developmental changes of rat small intestinal microvillus membrane (MVM) sugar components, binding studies were done using peanut agglutinin (PNA) and soybean agglutinin (SBA). MVM were prepared from rats of different ages (new-borns to 12 weeks). The Airfuge method was used for separation of unbound material. Characteristics of sugar ligand specificity were different for PNA and SBA, although D(+)galactose was used as an inhibitor for both lectins. Concentration curves and Scatchard plots showed partial saturation of total binding, and at least two groups of MVM ligands. Differences in lectin binding between newborn and adult MVM were opposite for PNA and SBA (newborns bound more PNA, but less SBA). During the first few postnatal weeks in rats, SBA binding changed early, and PNA binding exhibited an intermediate change, not related to weaning. Changes in MVM glycoproteins shown by lectin binding appear to be part of a complex postnatal maturational process in rats, involving different biochemical, functional, and biophysical membrane characteristics.
Insights
Rat small intestinal microvillus membrane (MVM) sugar components change postnatally. Lectin binding studies with peanut agglutinin (PNA) and soybean agglutinin (SBA) reveal distinct developmental patterns in MVM glycoproteins.
Area of Science:
- Biochemistry
- Developmental Biology
- Cell Biology
Background:
- The small intestine's microvillus membrane (MVM) plays a crucial role in nutrient absorption.
- Postnatal development involves significant changes in intestinal structure and function.
- Understanding MVM composition changes is key to understanding intestinal maturation.
Purpose of the Study:
- To investigate postnatal developmental changes in rat small intestinal MVM sugar components.
- To characterize the binding specificities of peanut agglutinin (PNA) and soybean agglutinin (SBA) lectins to MVM.
Main Methods:
- Preparation of MVM from rats aged newborn to 12 weeks.
- Lectin binding studies using PNA and SBA.
- Airfuge method for separating unbound material.
- Analysis of binding data using concentration curves and Scatchard plots.
Main Results:
- PNA and SBA exhibited different sugar ligand specificities, though both were inhibited by D(+)galactose.
- Scatchard plot analysis indicated at least two MVM ligand groups.
- Lectin binding differences between newborn and adult MVM were inverse for PNA and SBA.
- SBA binding changed early in postnatal development, while PNA binding showed an intermediate change.
Conclusions:
- Changes in MVM glycoproteins, as indicated by lectin binding, are integral to complex postnatal rat intestinal maturation.
- These changes involve alterations in biochemical, functional, and biophysical membrane characteristics.
- Distinct developmental trajectories for PNA and SBA binding highlight specific maturational processes.