The olfactory system is an important component of the sensory nervous system and is also one of the earliest senses to appear in animal evolution. Smell plays a very important role in both animal survival and human life. The olfactory function is closely related to many diseases, such as epilepsy patients sometimes experiencing olfactory hallucinations before seizures; People who were originally sensitive to smell later have a decreased sense of smell, which may be related to Parkinson's or Alzheimer's disease.There is ample evidence to prove that the function of VIP interneurons in the brain is crucial for ensuring olfaction, and the key to this study is how to restore the activity of VIP Peptide Powder and VIP interneurons.
1.What are the relevant studies on the regulation of VIP neurons on local olfactory neural circuits and olfactory function?
The study of olfactory perception process and olfactory function can not only reveal the operating principles of the olfactory system itself, but also provide important information for the pathogenesis and early diagnosis of certain related diseases. The olfactory bulb is the first center for olfactory information transmission, and its complex neural circuits can extract and integrate olfactory information from olfactory neurons, and perform complex information processing and corresponding encoding. M/Ts are two types of projection neurons in the olfactory bulb, and different types of interneurons in the olfactory bulb play important roles in regulating the output of M/Ts, among which there are a large number of VIP interneurons distributed in the outer reticular layer.Researchers believe that VIP interneurons play important roles in sensory information processing in the cortex, the formation of key circuits during development, and the maintenance of memory in related behavioral processes. However, their role in regulating olfactory nerve circuits and representing olfactory information has not been studied.
2.What is the role of VIP interneurons in the regulation of olfactory nerve circuits and the representation of olfactory information?
The researchers first elucidated the distribution and electrophysiological characteristics of VIP neurons in the olfactory bulb, demonstrating that VIP neurons are mainly distributed in the outer reticular layer and glomerular layer (Figure 1A); Like other outer reticular layer neurons, VIP neurons receive excitatory neural inputs from Sangha cells (Figure 1BC). The fiber optic calcium recording results showed that VIP neurons exhibited inhibitory responses to odors (Figure 1D). In order to investigate the role of VIP neurons in olfactory information representation, researchers combined awake head fixation in vivo electrophysiological recording technology and optogenetic technology to study the effects of activating VIP neurons on the M/Ts electrical activity of olfactory bulb output neurons and the local field potential (LFP) of the olfactory bulb. The results showed that photoactivation of VIP neurons inhibited spontaneous M/Ts electrical activity (Figure 2A); Odor can induce excitatory and inhibitory responses in M/Ts, while photoactivation of VIP neurons inhibits odor induced excitatory and inhibitory responses (Figure 2B). Electrical activity provides important information for the representation and encoding of olfactory information at the single-cell level, while LFP can reflect the local neural circuits of the olfactory bulb and the processing and integration of information between the olfactory bulb and other brain regions. The LFP oscillations in the olfactory bulb, especially beta oscillations and high gamma oscillations, exhibit strong and stable responses to odors and play an important role in odor detection. Field potential data indicate that activating VIP neurons suppresses odor induced beta and high gamma oscillations. These results suggest that VIP neurons play an important role in olfactory information representation.
3.Will VIP neurons affect olfactory behavior?
The results of in vivo electrophysiological studies suggest that VIP neurons form inhibitory synaptic connections with olfactory bulb output neurons (M/Ts). To verify this experimental conclusion, the researchers further investigated the regulatory effect of VIP neurons on olfactory bulb cells using ex vivo patch clamp technique. The research results found that, unlike the disinhibition effect of VIP neurons in the cortex, VIP neurons in the olfactory bulb directly inhibit Sangha cells by releasing GABA neurotransmitters (Figure 3).
Since VIP neurons can inhibit the electrical activity of olfactory bulb output neurons and affect the representation of olfactory information, will VIP neurons affect olfactory behavior? Researchers used chemical genetic methods to inactivate VIP neurons in the olfactory bulb and detected olfactory related behaviors at the behavioral level. The research results found that inactivating VIP neurons reduced the olfactory detection and resolution ability of mice , but did not affect innate odor preference and aversion behavior.
4.How to achieve the recovery of VIP neurons?
This study elucidated the basic characteristics of a class of interneurons widely distributed in the outer reticular and glomerular layers of the olfactory bulb - vasoactive intestinal peptide expressing (VIP) neurons - and their synaptic connections with olfactory bulb output neurons - monk cap cells and tufted cells (M/Ts), and investigated their important roles in olfactory related behavior. However, neurons in the human body continue to die out with aging, and Vasoactive Intendal Peptide neurons are no exception. So scientists implanted Vasoactive Intesting Peptide powder into mice of different ages and still found that VIP neurons can be activated in a reasonable way.
5.Why do you choose our VIP Pepper Powder?
In short, this work elucidates the important role of VIP neurons in regulating olfactory information representation and olfactory function in the olfactory bulb. The research results contribute to understanding the regulatory role and mechanism of the neural circuits within the olfactory bulb on olfactory output, as well as the encoding process of olfactory information in the olfactory bulb. On the other hand, it can also provide new clues for the function of VIP interneurons in the brain and new applications of VIP Pepper Powder.
Currently, research on VIP Pepper is in full swing. If you are interested, please feel free to contact us.(Our email address is:sales6@faithfulbio.com) Compared to other companies, our Vasoactive Intendal Peptide has the following advantages:
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