In diabetes-prone BioBreeding rats, an enteropathy often precedes the onset of auto-immune insulitis. The present study draws attention to quantitative and qualitative alterations of intestinal mucins in this animal model of type 1 diabetes mellitus. Male and female diabetes-resistant (BBc) and diabetes-prone (BBdp) BioBreeding rats fed, from one to two weeks after weaning onwards, either a plant-based diabetes-promoting diet (NTP) or a hydrolysed casein diabetes-protective diet (HC), were sacrificed at 11-14 weeks of age. Proteins and total mucins, as well as acid and neutral mucins, were measured in a segment of the intestinal tract, located 25-30 cm below the pylorus. No significant difference between BBc and BBdp rats was found when fed the HC diet. However, the NTP diet lowered both total and neutral mucins, whilst failing to affect significantly acidic mucins. The effects of the NTP diet were more pronounced in BBdp rats than in BBc rats. It is speculated that the quantitative and qualitative changes evoked by the NTP diet in BBdp rats may play a role in the alteration of gut permeability found under the same experimental conditions.
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