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Evidence for an increased intracellular free calcium concentration in platelets of bronchial asthma patients

S Kuroda1, K Ishikawa, H Hanamitsu

  • 1Department of Clinical Research, National Okura Hospital, Tokyo.

Internal Medicine (Tokyo, Japan)
|August 1, 1995
PubMed

Insights

Patients with bronchial asthma show higher intracellular free calcium levels in platelets, suggesting a potential role in airway smooth muscle contraction and asthma pathogenesis.

Area of Science:

  • Biomedical research
  • Respiratory medicine
  • Cellular physiology

Background:

  • The exact mechanisms behind bronchial asthma pathogenesis remain unclear.
  • Abnormal intracellular free calcium ([Ca2+]i) metabolism is implicated in various diseases.
  • Investigating [Ca2+]i in asthma could reveal novel insights into disease mechanisms.

Purpose of the Study:

  • To determine if intracellular free calcium ([Ca2+]i) levels are abnormal in individuals with bronchial asthma.
  • To compare [Ca2+]i levels in asthma patients versus healthy controls.

Main Methods:

  • Used the fluorescent indicator Fura-2 to measure resting intracellular free calcium ([Ca2+]i) levels.
  • Analyzed [Ca2+]i in washed platelets from 32 bronchial asthma patients and 63 normal subjects.

Main Results:

  • Bronchial asthma patients exhibited significantly higher mean [Ca2+]i levels (152.7 +/- 44.1 nM) compared to control subjects (129.7 +/- 18.0 nM).
  • The difference in [Ca2+]i levels was statistically significant (p < 0.05).

Conclusions:

  • Elevated intracellular free calcium ([Ca2+]i) in asthma patients suggests a potential link to the condition.
  • This finding supports the hypothesis that abnormal [Ca2+]i contributes to bronchial asthma pathogenesis.
  • Increased [Ca2+]i may play a role in tracheal smooth muscle contraction, a key feature of asthma.

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