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Haem biosynthesis in rheumatoid disease

B C Campbell, N Rennie, G G Thompson

British Journal of Haematology

|December 1, 1978

Summary

This study investigated haem biosynthesis in rheumatoid disease patients. Enzyme activities and porphyrin levels were analyzed, revealing depressed coproporphyrinogen oxidase and potential marrow unresponsiveness contributing to anemia.

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Area of Science:

Biochemistry
Hematology
Rheumatology

Background:

Rheumatoid disease is often associated with anemia.
The precise mechanisms underlying anemia in rheumatoid disease are not fully understood.
Haem biosynthesis is a critical pathway for red blood cell production.

Purpose of the Study:

To investigate the activity of enzymes in the haem biosynthetic pathway in patients with rheumatoid disease.
To determine levels of porphyrins and their precursors in these patients.
To explore potential links between haem biosynthesis, anemia, and rheumatoid disease.

Main Methods:

Enzyme activity assays for six key haem biosynthetic enzymes in blood.
Quantification of porphyrins and porphyrin precursors in blood, urine, and feces.
Comparison of findings between anemic and non-anemic rheumatoid disease patients.

Main Results:

No significant differences in most enzyme activities or porphyrin levels were observed between anemic and non-anemic groups.
Delta-amino-laevulinate synthase activity did not increase adequately in response to anemia.
Coproporphyrinogen oxidase activity was significantly depressed in the studied patients.
Normal ferrochelatase activity and protoporphyrin levels suggest iron unavailability despite normal iron amounts.

Conclusions:

Marrow unresponsiveness, potentially due to inadequate delta-amino-laevulinate synthase response, may contribute to anemia in rheumatoid disease.
Iron unavailability, despite normal iron levels, is indicated by normal ferrochelatase and protoporphyrin.
Depressed coproporphyrinogen oxidase activity is a notable finding in rheumatoid disease patients.

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