RESPIRATION OF MAMMALIAN ERYTHROCYTES.

Area of Science:

• Biochemistry
• Cellular Respiration
• Physiology

Background:

• Non-nucleated mammalian erythrocytes typically do not respire, even when supplied with sugar.
• Methylene blue can induce respiration in these cells.

Purpose of the Study:

• To investigate if organ extracts can also induce erythrocyte respiration.
• To characterize the nature of this induced respiration.

Main Methods:

• Aqueous extracts from various mammalian organs were prepared.
• Erythrocyte respiration was measured in the presence of sugar, methylene blue, and organ extracts.
• The effect of carbon monoxide on induced respiration was assessed.
• Experiments were conducted with both intact and hemolyzed erythrocytes.

Main Results:

• Aqueous organ extracts, particularly from liver, induced respiration in erythrocytes, similar to methylene blue.
• This induced respiration was not inhibited by carbon monoxide.
• The respiratory-inducing capacity varied among organs, with liver and kidney being most effective.
• Hemolyzed erythrocytes did not exhibit induced respiration with either methylene blue or organ extracts.

Conclusions:

• Mammalian erythrocytes possess a latent respiratory capacity that can be activated by specific substances like methylene blue and organ extracts.
• The respiratory supplement in organ extracts is distinct from typical carbon monoxide-sensitive pathways.
• The integrity of the erythrocyte structure is essential for this induced respiration.