Olfactory sensitivity to odorant molecules is a complex biological function influenced by both endogenous factors, such as genetic background and physiological state, and exogenous factors, such as environmental conditions. In animals, this vital ability is mediated by olfactory sensory neurons (OSNs), which are distributed across several specialized olfactory subsystems depending on the species. Using the phosphorylation of the ribosomal protein S6 (rpS6) in OSNs following sensory stimulation, we developed an ex vivo assay allowing the simultaneous conditioning and odorant stimulation of different mouse olfactory subsystems, including the main olfactory epithelium, the vomeronasal organ, and the Grueneberg ganglion. This approach enabled us to observe odorant-induced neuronal activity within the different olfactory subsystems and to demonstrate the impact of environmental conditioning, such as temperature variations, on olfactory sensitivity, specifically in the Grueneberg ganglion. We further applied our rpS6-based assay to the human olfactory system and demonstrated its feasibility. Our findings show that analyzing rpS6 signal intensity is a robust and highly reproducible indicator of neuronal activity across various olfactory systems, while avoiding stress and some experimental limitations associated with in vivo exposure. The potential extension of this assay to other conditioning paradigms and olfactory systems, as well as its application to other animal species, including human olfactory diagnostics, is also discussed.

• MeSH
• čich fyziologie   MeSH
• čichová sliznice metabolismus   MeSH
• čichové buňky * metabolismus   fyziologie   MeSH
• fosforylace MeSH
• lidé MeSH
• myši inbrední C57BL MeSH
• myši MeSH
• odoranty analýza   MeSH
• ribozomální protein S6 * metabolismus   MeSH
• vomeronazální orgán metabolismus   fyziologie   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• mužské pohlaví MeSH
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH

• Klíčová slova
• Ostatní lékařské obory,
• MeSH
• centrální nervový systém anatomie a histologie   MeSH

• NLK Obory
• neurologie
• anatomie

Olfaction enables most mammalian species to detect and discriminate vast numbers of chemical structures called odorants and pheromones. The perception of such chemical compounds is mediated via two major olfactory systems, the main olfactory system and the vomeronasal system, as well as minor systems, such as the septal organ and the Grueneberg ganglion. Distinct differences exist not only among species but also among individuals in terms of their olfactory sensitivity; however, little is known about the mechanisms that determine these differences. In research on the olfactory sensitivity of mammals, scientists thus depend in most cases on behavioral testing. In this article, we reviewed scientific studies performed on various mammalian species using different methodologies and target chemical substances. Human and non-human primates as well as rodents and dogs are the most frequently studied species. Olfactory threshold studies on other species do not exist with the exception of domestic pigs. Olfactory testing performed on seals, elephants, and bats focused more on discriminative abilities than on sensitivity. An overview of olfactory sensitivity studies as well as olfactory detection ability in most studied mammalian species is presented here, focusing on comparable olfactory detection thresholds. The basics of olfactory perception and olfactory sensitivity factors are also described.

• MeSH
• čich * MeSH
• čichová percepce * MeSH
• lidé MeSH
• senzorické prahy * MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• přehledy MeSH
• srovnávací studie MeSH

An animal's fitness strongly depends on successful feeding, avoidance of predators and reproduction. All of these behaviours commonly involve chemosensation. As a consequence, when species' ecological niches and life histories differ, their chemosensory abilities need to be adapted accordingly. The intertidal insect Clunio marinus (Diptera: Chironomidae) has tuned its olfactory system to two highly divergent niches. The long-lived larvae forage in a marine environment. During the few hours of terrestrial adult life, males have to find the female pupae floating on the water surface, free the cryptic females from their pupal skin, copulate and carry the females to the oviposition sites. In order to explore the possibility for divergent olfactory adaptations within the same species, we investigated the chemosensory system of C. marinus larvae, adult males and adult females at the morphological and molecular level. The larvae have a well-developed olfactory system, but olfactory gene expression only partially overlaps with that of adults, likely reflecting their marine vs. terrestrial lifestyles. The olfactory system of the short-lived adults is simple, displaying no glomeruli in the antennal lobes. There is strong sexual dimorphism, the female olfactory system being particularly reduced in terms of number of antennal annuli and sensilla, olfactory brain centre size and gene expression. We found hints for a pheromone detection system in males, including large trichoid sensilla and expression of specific olfactory receptors and odorant binding proteins. Taken together, this makes C. marinus an excellent model to study within-species evolution and adaptation of chemosensory systems.

• MeSH
• biologická adaptace fyziologie   MeSH
• bulbus olfactorius metabolismus   fyziologie   MeSH
• Chironomidae metabolismus   fyziologie   MeSH
• čich fyziologie   MeSH
• čichové buňky metabolismus   MeSH
• hmyz metabolismus   fyziologie   MeSH
• hmyzí proteiny metabolismus   MeSH
• kladení vajíček fyziologie   MeSH
• kukla metabolismus   fyziologie   MeSH
• larva metabolismus   MeSH
• pohlavní dimorfismus * MeSH
• receptory pachové metabolismus   MeSH
• sensilla metabolismus   fyziologie   MeSH
• vodní organismy metabolismus   fyziologie   MeSH
• zvířata MeSH
• Check Tag
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

Dysfunctional sensory systems, including altered olfactory function, have recently been reported in patients with autism spectrum disorder (ASD). Disturbances in olfactory processing can potentially result from gamma-aminobutyric acid (GABA)ergic synaptic abnormalities. The specific molecular mechanism by which GABAergic transmission affects the olfactory system in ASD remains unclear. Therefore, the present study aimed to evaluate selected components of the GABAergic system in olfactory brain regions and primary olfactory neurons isolated from Shank3-deficient (-/-) mice, which are known for their autism-like behavioral phenotype. Shank3 deficiency led to a significant reduction in GEPHYRIN/GABAAR colocalization in the piriform cortex and in primary neurons isolated from the olfactory bulb, while no change of cell morphology was observed. Gene expression analysis revealed a significant reduction in the mRNA levels of GABA transporter 1 in the olfactory bulb and Collybistin in the frontal cortex of the Shank3-/- mice compared to WT mice. A similar trend of reduction was observed in the expression of Somatostatin in the frontal cortex of Shank3-/- mice. The analysis of the expression of other GABAergic neurotransmission markers did not yield statistically significant results. Overall, it appears that Shank3 deficiency leads to changes in GABAergic synapses in the brain regions that are important for olfactory information processing, which may represent basis for understanding functional impairments in autism.

• MeSH
• GABA metabolismus   MeSH
• lidé MeSH
• mikrofilamentové proteiny metabolismus   MeSH
• myši MeSH
• neurony metabolismus   MeSH
• olfaktoriální kortex * metabolismus   MeSH
• poruchy autistického spektra * metabolismus   MeSH
• proteiny nervové tkáně genetika   metabolismus   MeSH
• synapse metabolismus   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH

Drug addiction is commonly associated with depression and comorbid patients also suffer from higher cravings and increased relapse rate. To address this issue preclinically we combined the olfactory bulbectomy (OBX) model of depression and intravenous methamphetamine self-administration procedure in rats to assess differences in relapse-like behavior. Male Sprague-Dawley rats were divided randomly into two groups; in one group the bilateral olfactory bulbectomy (OBX) was performed while the other group was sham operated. After recovery, intracardiac catheter was implanted. Intravenous self-administration procedure was conducted in operant boxes using nose-poke operandi (Coulbourn Instruments, Inc., USA) under fixed ratio 1 schedule of reinforcement. Methamphetamine was available at dose 0.08 mg/kg/infusion. After stable methamphetamine intake was maintained, a period of forced abstinence was initiated and rats were kept in their home-cages for 14 days. Finally, one reinstatement session was conducted in operant boxes with no drug delivery. In the reinstatement session the mean of 138.4 active nose-pokes was performed by the OBX group, while the sham group displayed 41 responses, i.e. 140 % and 48 % of basal nose-poking during maintenance phase in OBX and sham operated group respectively. OBX group also showed significantly more passive nose-pokes indicating hyperactive behavioral traits in bulbectomized rats. However, the % of active operandum preference was equal in both groups. Olfactory bulbectomy model significantly increased reinstatement of methamphetamine seeking behavior. This paradigm can be used to evaluate potential drugs that are able to suppress the drug-seeking behavior.

• MeSH
• autoaplikace MeSH
• bulbus olfactorius patofyziologie   chirurgie   MeSH
• chování při shánění drogy fyziologie   MeSH
• depresivní poruchy komplikace   patofyziologie   MeSH
• intravenózní podání MeSH
• methamfetamin aplikace a dávkování   MeSH
• modely nemocí na zvířatech MeSH
• náhodné rozdělení MeSH
• operantní podmiňování účinky léků   fyziologie   MeSH
• poruchy spojené s užíváním amfetaminu komplikace   patofyziologie   MeSH
• potkani Sprague-Dawley MeSH
• recidiva MeSH
• stimulanty centrálního nervového systému aplikace a dávkování   MeSH
• zaváděcí katétry MeSH
• zvířata MeSH
• Check Tag
• mužské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• validační studie MeSH

OBJECTIVE: To investigate the coronavirus disease 2019 (COVID-19) status of patients with initial sudden olfactory anosmia (ISOA) through nasopharyngeal swabs for reverse transcription-polymerase chain reaction (RT-PCR) analysis and to explore their olfactory dysfunctions with psychophysical olfactory evaluation. METHODS: A total of 78 ISOA patients were recruited from April 6, 2020, to April 10, 2020, through a public call of University of Mons (Mons, Belgium). Patients benefited from nasopharyngeal swabs and fulfilled the patient-reported outcome questionnaire. Among them, 46 patients performed psychophysical olfactory evaluation using olfactory identification testing. Based on the duration of the ISOA, 2 groups of patients were compared: patients with olfactory dysfunction duration ≤12 days (group 1) and those with duration >12 days (group 2). RESULTS: In group 1, 42 patients (87.5%) had a positive viral load determined by RT-PCR and 6 patients (12.5%) were negative. In group 2, 7 patients (23%) had a positive viral load and 23 patients (77%) were negative. The psychophysical olfactory evaluation reported that anosmia and hyposmia occurred in 24 (52%) and 11 (24%) patients, respectively. Eleven patients were normosmic. The viral load was significantly higher in patients of group 1 compared with those of group 2. CONCLUSIONS: Coronavirus disease 2019 was detected in a high proportion of ISOA patients, especially over the first 12 days of olfactory dysfunction. Anosmia is an important symptom to consider in the detection of COVID-19 infection.

• MeSH
• Betacoronavirus MeSH
• COVID-19 MeSH
• diagnostické techniky dýchacího ústrojí MeSH
• dospělí MeSH
• dysgeuzie MeSH
• fyzikální stimulace MeSH
• hodnocení výsledků péče pacientem MeSH
• klinické laboratorní techniky MeSH
• koronavirové infekce komplikace   diagnóza   MeSH
• lidé středního věku MeSH
• lidé MeSH
• mladý dospělý MeSH
• nosní obstrukce MeSH
• odoranty MeSH
• pandemie MeSH
• polymerázová řetězová reakce s reverzní transkripcí MeSH
• poruchy čichu komplikace   diagnóza   MeSH
• prospektivní studie MeSH
• SARS-CoV-2 MeSH
• senioři MeSH
• studie případů a kontrol MeSH
• testování na COVID-19 MeSH
• virová pneumonie komplikace   diagnóza   MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• Geografické názvy
• Belgie MeSH

Olfactory bulbectomy in rodents is considered a putative model of depression. Depression is often associated with drug addiction. Our previous studies demonstrated that methamphetamine (MA) administration to rat mothers affects both, mothers and their pups. The aim of the present study was to examine the effect of bulbectomy, as a model of depression, and MA administration on behavior of rat mothers and postnatal development of their pups. Adult female Wistar rats were randomly divided into two groups: bulbectomized (OBX) and sham-operated (SH). A period of 20 days was allowed for the development of the depressive-like phenotype. Animals were tested in the motor activity test and 2 % sucrose preference for anhedonia and hyperactive locomotor response to a novel environment, respectively. After then females were impregnated. Pregnant females were exposed to daily subcutaneous (s.c.) injection of MA (5 mg/kg) or saline (SA) during the entire gestation period. Postnatally, maternal behavior and pup development was examined. The effect of a challenge dose of MA (1 mg/kg, s.c.) on behavior was further examined in adult male offspring. Our results showed no differences in the maternal behavior as a matter of bulbectomy, only OBX rats slept more than all the SH controls. Pups from OBX mothers were born with lower birthweight and gained less weight during the postnatal development than pups from SH controls. Both, bulbectomy and MA administration, delayed the eyes opening. As a matter of functional development of the pups, maternal OBX procedure impaired the performance in the Bar-holding test, but only in saline group. OBX/SA group was the worst in the Bar-holding test relative to all the other groups. In addition, pups from OBX mothers dropped more boluses during the Bar-holding test, suggesting that they were more stressed. In adult male offspring, bulbectomy increased immobility only in the SA/SA group. Prenatal MA exposure increased locomotion, while decreasing immobility. In addition, challenge dose of MA in adulthood increased distance traveled, locomotion, rearing, and average and maximal velocity, while decreasing immobility and grooming. In conclusion, our results suggest that depressive-like phenotype of rat mothers induces impairment in somatic and functional development of their male offspring.

• MeSH
• bulbus olfactorius chirurgie   MeSH
• krysa rodu rattus MeSH
• lokomoce MeSH
• methamfetamin toxicita   MeSH
• náhodné rozdělení MeSH
• novorozená zvířata MeSH
• potkani Wistar MeSH
• stimulanty centrálního nervového systému toxicita   MeSH
• těhotenství MeSH
• tělesná hmotnost účinky léků   fyziologie   MeSH
• zpožděný efekt prenatální expozice chemicky indukované   patofyziologie   psychologie   MeSH
• zvířata MeSH
• Check Tag
• krysa rodu rattus MeSH
• mužské pohlaví MeSH
• těhotenství MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH

Čuch zohráva v živote človeka dôležitú úlohu. Fyziologicky dochádza počas starnutia k zhoršeniu čuchu. Čuchové dysfunkcie bolí pozorované pri mnohých ochoreniach. Napriek tomu, že zhoršenie čuchu, prípadne jeho úplná absencia neohrozujú priamo život človeka, môžu byť dôležitým signálom začiatku chorobného procesu. Je dávnejšie známe, že strata čuchu sa objavuje ako jeden z prvých príznakov neurodegeneratívnych ochorení. V zahraničí boli vyvinuté pomerne jednoduché a účinné čuchové testy, ktoré sa s úspechom využívajú a napomáhajú v klinickej praxi správnej diagnostike. V tomto článku sú uvedené najčastejšie používané čuchové testy v zahraničí, ktoré by mohli uľahčiť a zobjektívniť vyšetrenie čuchových schopností aj u nás a tak napomôcť včasnej a správnej diagnóze.

Smell plays an important part in the life of man. During ageing physiological deterioration of smell occurs. Olfactory dysfunctions were observed in many diseases. Despite this deterioration of smell or its complete absence do not threaten directly man's life but can be an important signal of the beginning of a pathological process. It has been known for a long time that loss of smell is one of the first symptoms of neurodegenerative diseases. In other countries relatively simple and effective olfactory tests were developed which are successfully used and help in clinical practice with a correct diagnosis. In the submitted article the authors mention the olfactory tests used most frequently abroad, tests which could facilitate and make more objective examination of olfactory capacity also in this country and thus help with early and correct diagnosis.

• MeSH
• Alzheimerova nemoc etiologie   patologie   MeSH
• čich genetika   MeSH
• finanční podpora výzkumu jako téma MeSH
• klinické chemické testy metody   MeSH
• lidé MeSH
• neurodegenerativní nemoci etiologie   MeSH
• odoranty MeSH
• Parkinsonova nemoc etiologie   patologie   MeSH
• poruchy čichu diagnóza   etiologie   patologie   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• přehledy MeSH

• MeSH
• akční potenciály MeSH
• bulbus olfactorius fyziologie   MeSH
• čich genetika   MeSH
• krysa rodu rattus MeSH
• nervový systém - fyziologické jevy MeSH
• nervový systém MeSH
• šířící se kortikální deprese MeSH
• zvířata MeSH
• Check Tag
• krysa rodu rattus MeSH
• mužské pohlaví MeSH
• zvířata MeSH