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Biochemistry of human converting enzyme.
Summary
Researchers purified human kidney angiotensin converting enzyme (ACE) and developed an antibody. This antibody revealed ACE localization in various human tissues, including unique presence in renal carcinoma, suggesting potential isoenzymes.
Area of Science:
- Biochemistry
- Immunology
- Cell Biology
Background:
- Angiotensin converting enzyme (ACE) plays a crucial role in the renin-angiotensin system.
- Understanding ACE distribution and potential variations is vital for physiological and pathological studies.
Purpose of the Study:
- To purify human kidney ACE and generate a specific antibody.
- To investigate the tissue distribution and cellular localization of ACE in humans.
- To explore ACE presence in renal carcinoma tissues.
Main Methods:
- Purification of ACE from human kidney.
- Antibody generation in rabbits against purified human ACE.
- Immunofluorescence and immunoelectron microscopy for cellular localization.
- Immunocytological analysis of human tissues, including carcinoma.
Main Results:
- Purified human kidney ACE was obtained.
- The generated antibody recognized ACE from various human sources (kidney, lung, intestine, plasma, urine).
- ACE was localized to the plasma membrane and vesicles in lung endothelium, and brush border/intercellular membranes of kidney proximal tubules.
- ACE was detected in alveolar macrophages and renal carcinoma tissues, with the latter showing potential immunological differences.
Conclusions:
- The study successfully characterized human kidney ACE and its antibody.
- ACE exhibits specific tissue and cellular localization patterns in humans.
- The presence and potential distinct nature of ACE in renal carcinoma warrant further investigation.