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Related Concept Videos

Olfaction01:25

Olfaction

The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
Vitamins01:30

Vitamins

Vitamins, derived from the Latin word for life, are essential organic substances required in small quantities for optimal growth and overall well-being. Unlike other organic nutrients, vitamins don't act as sources of energy or building materials but rather facilitate these nutrients' utilization by the body. Vitamins are predominantly coenzymes, assisting enzymes in specific chemical actions, like the oxidation of glucose for energy involving B vitamins. Most vitamins are not produced in our...
Multiple Sclerosis l: Introduction01:19

Multiple Sclerosis l: Introduction

Multiple sclerosis is a chronic autoimmune disease of the central nervous system (CNS) that affects the brain, spinal cord, and optic nerves. It is an inflammatory demyelinating disorder and a leading cause of neurological disability in young adults.EpidemiologyMS commonly begins between 20 and 40 years of age and is twice as common in women. Its exact cause remains unclear, but genetic susceptibility contributes, with higher risk in first-degree relatives and identical twins. A greater...

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Related Experiment Video

Updated: May 11, 2026

Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
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Vitamin D levels and olfactory dysfunction in multiple sclerosis patients.

Zidan Gao1, Zhuoma Danzhen2,3, Junyu Zhu2

  • 1School of Clinical Medicine, Soochow University, Suzhou, China.

The International Journal of Neuroscience
|February 19, 2024
PubMed
Summary
This summary is machine-generated.

Serum vitamin D levels may impact smell dysfunction in Chinese multiple sclerosis (MS) patients. Lower vitamin D correlated with poorer olfactory function in MS, suggesting a potential regulatory role.

Keywords:
ChinaMultiple sclerosisolfactory testthe University of Pennsylvania smell identification Testvitamin D

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Area of Science:

  • Neurology
  • Endocrinology
  • Otorhinolaryngology

Background:

  • Multiple sclerosis (MS) is a chronic neurological disease.
  • Olfactory dysfunction is a common but often overlooked symptom in MS.
  • The role of vitamin D in MS pathogenesis and symptoms is an area of ongoing research.

Purpose of the Study:

  • To investigate the relationship between serum vitamin D levels and olfactory impairment in Chinese patients with multiple sclerosis.
  • To compare olfactory function and vitamin D levels between MS patients and healthy controls.

Main Methods:

  • A cohort of 25 MS patients and 18 healthy controls (HCs) from Guizhou, China, were recruited.
  • Olfactory function was assessed using the University of Pennsylvania Smell Identification Test (UPSIT).
  • Serum 25-hydroxyvitamin D levels were measured.

Main Results:

  • Significant differences in serum vitamin D levels and UPSIT scores were observed between the MS group and the control group (p < 0.001).
  • A significant positive correlation (r = 0.537, p = 0.021) was found between vitamin D levels and UPSIT scores in MS patients.
  • This suggests that higher vitamin D levels are associated with better olfactory function in this MS cohort.

Conclusions:

  • Serum vitamin D levels may play a role in regulating olfactory dysfunction among patients with multiple sclerosis in Guizhou, China.
  • Further research is warranted to elucidate the mechanisms underlying this association and its clinical implications.