Mycoplasma bacteria are one of the most common causes of bacterial pneumonia in children. It is still unclear how the disease develops.
Researchers from the University Children's Hospital Zurich and UZH have now demonstrated that there are specific immune cells, so-called B cells, which are crucial for recovery from the infection. The antibodies produced by these cells eliminate mycoplasma in the lungs, whereas these bacteria can persist in the upper respiratory tract.
Pneumonia
Pneumonia is a lung infection that can be caused by a bacteria or a virus. It causes inflammation of the alveoli or the air sacs of the lungs.
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‘Specific immune cells,which are crucial for recovery from the bacterial infection are eliminated from the lungs in response to antibiotics but they persist in the upper respiratory tract.’
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The team of researchers cultured the bacteria with a fluorescent dye and were thus for the first time able to visually track the pathogen in the lung and upper respiratory tract during an infection. The findings from the newly developed mouse model mimic clinical observations in children, whose upper respiratory tracts still contained mycoplasma following an infection.
Different immune responses in the lung and upper respiratory tract
Infectious disease specialist Patrick Meyer Sauteur showed together with the international team that there are significant differences between the lung and the upper respiratory tract in the immune response after an infection.
![Respiratory Diseases]( "Respiratory Diseases")
Respiratory diseases affect any part of the respiratory system. Some of the lung diseases like chronic obstructive pulmonary disease can lead to respiratory failure.
The researchers found more so-called IgM and IgG antibodies in the lung as well as an increase and activation of B cells in local lymph nodes - which meant that pathogens were able to be eliminated within weeks. In contrast, in the upper respiratory tract they found IgA antibodies but no activation of B cells, which corresponds to the observed persistence of the pathogen at this site.
In the end, experiments carried out with B cell-deficient mice demonstrated that the transfer of antibodies into these mice effectively eliminated the bacteria in the lung, but was not able to clear the bacteria in the upper respiratory tract. B cells with crucial role
"This data is the first proof that the antibody response is crucial to clear pulmonary infections caused by mycoplasma," states Patrick Meyer Sauteur. These findings may help develop specific vaccines that elicit antibody responses to protect from infection: "Our work paves the way for the development of vaccines against mycoplasma. Target groups for such vaccines would include young children without treatment alternatives as a result of the emerging resistance to antibiotics against mycoplasma in certain countries," concludes Meyer Sauteur.
Source: Eurekalert
Infectious disease specialist Patrick Meyer Sauteur showed together with the international team that there are significant differences between the lung and the upper respiratory tract in the immune response after an infection.
Respiratory Diseases
Respiratory diseases affect any part of the respiratory system. Some of the lung diseases like chronic obstructive pulmonary disease can lead to respiratory failure.
Advertisement
The researchers found more so-called IgM and IgG antibodies in the lung as well as an increase and activation of B cells in local lymph nodes - which meant that pathogens were able to be eliminated within weeks. In contrast, in the upper respiratory tract they found IgA antibodies but no activation of B cells, which corresponds to the observed persistence of the pathogen at this site.
In the end, experiments carried out with B cell-deficient mice demonstrated that the transfer of antibodies into these mice effectively eliminated the bacteria in the lung, but was not able to clear the bacteria in the upper respiratory tract. B cells with crucial role
"This data is the first proof that the antibody response is crucial to clear pulmonary infections caused by mycoplasma," states Patrick Meyer Sauteur. These findings may help develop specific vaccines that elicit antibody responses to protect from infection: "Our work paves the way for the development of vaccines against mycoplasma. Target groups for such vaccines would include young children without treatment alternatives as a result of the emerging resistance to antibiotics against mycoplasma in certain countries," concludes Meyer Sauteur.
Source: Eurekalert
Legionnaires’ disease
Legionnaires' disease is a severe form of pneumonia caused by a type of bacteria. The infection is likely to spread when people inhale tiny water droplets containing the bacteria.
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