Related Experiment Videos
IL-5 mRNA expression in blood lymphocytes from patients with Kimura's disease and parasite infection
H Enokihara1, T Koike, H Arimura
1Third Department of Internal Medicine, Dokkyo University, School of Medicine, Tochigi, Japan.
Abstract:
Blood lymphocytes from patients with eosinophilia are known to produce interleukin-5 (IL-5) with appropriate stimulation in vitro. To determine whether blood lymphocytes from these patients produce IL-5 in vivo, we tested the IL-5 mRNA expression in blood lymphocytes immediately after separation by reverse-transcriptase polymerase chain reaction (RT-PCR) method. We found that lymphocytes from eosinophilic patients expressed IL-5 mRNA, but lymphocytes from normal volunteers did not express the lymphokine. These findings suggest that in patients with eosinophilia, peripheral blood lymphocytes produce IL-5 in vivo.
Insights
Peripheral blood lymphocytes in patients with eosinophilia produce interleukin-5 (IL-5) in vivo. This study confirms IL-5 mRNA expression in eosinophilic patients, unlike healthy individuals, indicating local cytokine production.
Area of Science:
- Immunology
- Molecular Biology
Background:
- Eosinophilia is associated with elevated Interleukin-5 (IL-5) levels.
- Previous studies demonstrated in vitro IL-5 production by lymphocytes from eosinophilic patients.
Purpose of the Study:
- To investigate in vivo IL-5 production by peripheral blood lymphocytes in patients with eosinophilia.
- To determine if IL-5 mRNA is expressed in lymphocytes from these patients under physiological conditions.
Main Methods:
- Blood lymphocytes were isolated from patients with eosinophilia and healthy volunteers.
- Reverse-transcriptase polymerase chain reaction (RT-PCR) was used to detect IL-5 mRNA expression immediately after cell separation.
Main Results:
- IL-5 mRNA was detected in blood lymphocytes from patients with eosinophilia.
- Lymphocytes from normal volunteers did not show detectable IL-5 mRNA expression.
- This indicates active IL-5 gene transcription in vivo.
Conclusions:
- Peripheral blood lymphocytes in patients with eosinophilia actively produce IL-5 in vivo.
- The findings support a role for lymphocyte-derived IL-5 in the pathogenesis of eosinophilia.
- This study provides direct evidence of in vivo cytokine production in this condition.