Patients with diabetes mellitus have a decreased olfactory function compared to healthy individuals. Hyposmia is more
common in type 2 diabetes (DM2) and is characterized by a decreased ability to recognize odors, impaired olfactory
memory, which reduces the quality of life of patients. The mechanisms of hyposmia require studies in animal models, but
no such studies have been performed in most commonly used animal models of DM2. The aim of the present study was to
investigate olfactory function in the model of nicotinamide-streptozotocin-induced DM2 in rats using widely used
behavioral tests of food search performance by smell and olfactory preference. The model of DM2 in male rats showed a
decrease in performance and an increase in the time spent on searching for food objects by smell, compared to the
control group, which suggests that diabetic animals develop hyposmia. The results of the test for differentiation of the
pheromonal mimetic isovaleric acid from bio-indifferent odorants showed no differences between the groups. These results
indicate that the development of DM2 in adult rats predominantly affects the functioning of the main olfactory system
rather than the functioning of the additional system responsible for the perception of pheromones and pheromonal
mimetics.
Key words:
Type 2 diabetes mellitus, olfaction, rat, food search performance test, olfactory preference test, nicotinamide-
streptozotocin-induced model
DOI: 10.31857/S0235009225010067
EDN: UUOHUA
Cite:
Gorskaya А. V., Chistyakova O. V., Vasiliev D. S.
Nikotinamid-streptozototsin-indutsirovannyi sakharnyi diabet 2-go tipa privodit k narusheniyu funktsionirovaniya osnovnoi obonyatelnoi sistemy u krys-samtsov linii wistar
[Nicotinamide-streptozotocin-induced type 2 diabetes mellitus leads to impaired function of the main olfactory system in male wistar rats].
Sensornye sistemy [Sensory systems].
2025.
V. 39(1).
P. 56–63 (in Russian). doi: 10.31857/S0235009225010067
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