Kinins and respiratory tract diseases

Area of Science:

• Biochemistry
• Pharmacology
• Immunology

Background:

• Bradykinin and kinins are peptidic hormones involved in inflammatory processes.
• The B1, B2, and B3 receptors are proposed mediators of kinin biological effects, with B1 and B2 largely confirmed.
• The precise role of bradykinin in asthma pathophysiology is unclear, though asthmatic subjects show hyperresponsiveness.

Purpose of the Study:

• To explore the role of bradykinin and kinins in airway diseases, including asthma and rhinitis.
• To investigate the potential link between kinins and cough associated with angiotensin-converting enzyme (ACE) inhibitors.
• To examine the proposed role of kinins in regulating lung carcinoma growth.

Main Methods:

• Review of existing literature on kinin function and involvement in various pathologies.
• Analysis of studies investigating bradykinin's effects on airway smooth muscle and inflammation.
• Examination of evidence linking kinins to ACE inhibitor-induced cough and lung cancer.

Main Results:

• Kinins may cause bronchoconstriction directly or indirectly through inflammation.
• Kinins are detected in nasal secretions during rhinovirus infections, contributing to rhinitis symptoms.
• Bradykinin's degradation by ACE suggests a link to ACE inhibitor side effects like cough.

Conclusions:

• Bradykinin and kinins play a significant role in airway inflammation and symptomatology.
• Further research is needed to fully elucidate the mechanisms of kinin action in airways and their pathological relevance.
• Understanding kinin pathways may offer insights into treating respiratory conditions and managing drug side effects.