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Alpha-1 antitrypsin deficiency in emphysema.

H Khan1, K A Salman, S Ahmed

  • 1Department of Biochemistry, JN Medical College, Aligarh Muslim University, India.

The Journal of the Association of Physicians of India
|August 8, 2002
PubMed
Summary

Alpha-1 antitrypsin deficiency is a genetic disorder impacting lung health, increasing emphysema risk. Cigarette smoking exacerbates these risks by reducing protective proteinase inhibitory activity.

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Area of Science:

  • Biochemistry
  • Genetics
  • Pulmonology

Background:

  • Human plasma contains proteinase inhibitors, crucial for regulating enzyme activity.
  • Serine proteases and their inhibitors (serpins) are vital in physiological processes like coagulation and inflammation.
  • Alpha-1 antitrypsin (alpha1 ATD) is the primary inhibitor of neutrophil elastase, protecting lung elastic tissue.

Purpose of the Study:

  • To highlight the role of alpha-1 antitrypsin (alpha1 ATD) as a key proteinase inhibitor.
  • To discuss the genetic disorder alpha1 ATD deficiency and its prevalence.
  • To explain the link between alpha1 ATD deficiency, emphysema, and the impact of cigarette smoking.

Main Methods:

  • Review of existing literature on proteinase inhibitors in human plasma.
  • Analysis of the physiological role of alpha-1 antitrypsin (alpha1 ATD).
  • Examination of the genetic basis and population prevalence of alpha1 ATD deficiency.

Main Results:

  • Alpha-1 antitrypsin (alpha1 ATD) is the most abundant plasma serine protease inhibitor.
  • Alpha1 ATD deficiency is a significant genetic disorder, particularly in populations of North European descent.
  • Reduced alpha1 ATD levels lead to unchecked elastase activity, causing lung tissue destruction and emphysema.
  • Cigarette smoking worsens lung damage by inhibiting proteinase activity and inducing bronchoalveolar changes.
  • Abnormal alpha1 ATD phenotypes are associated with increased asthma prevalence and severity.

Conclusions:

  • Alpha-1 antitrypsin (alpha1 ATD) plays a critical role in preventing lung diseases like emphysema.
  • Alpha1 ATD deficiency represents a substantial public health concern, influenced by genetic and environmental factors.
  • Understanding alpha1 ATD's function is crucial for managing and potentially preventing respiratory conditions.

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