Relative binding of therapeutic drugs by sera of seven mammalian species.

The research paper describes a study into how well different drugs bind to the serum (part of blood) in different mammalian species. The drugs tested were Acetaminophen, Lidocaine, Phenobarbital, Procainamide, Quinidine, and Theophylline. The results of this study provide important information for understanding how these drugs interact within the bodies of different mammals.

Research Methodology

• The researchers used pooled commercial serum extracted from seven different mammalian species: cow, goat, horse, human, pig, rabbit, and sheep.
• The serum was mixed with each drug at two concentrations (5 and 10 mM) and then underwent a process called equilibrium dialysis, which is a method used to study how a drug binds to a substance in the body.
• This process was carried out twice for every combination of serum, drug and drug concentration.
• The percentage of each drug that successfully bound itself to the serum was then calculated.

Research Findings

• Phenobarbital displayed significant binding affinity (>20%) to most of the serums tested at both concentrations, most notably to goat, horse, human, and sheep serum.
• Quinidine also showed similar strong binding affinity, but was only tested at the 5 mM concentration. It bound well to sera of cow, goat, horse, human, pig, and rabbit.
• Procainamide, on the other hand, showed negligible binding to most types of serum at both concentrations.
• Acetaminophen, Lidocaine, and Theophylline demonstrated less binding (<20%) to all the serum types tested. It was noted that Acetaminophen did not bind to human serum and Lidocaine showed no binding to horse or pig serum at the 10 mM concentration.
• Although there were differences (interspecies variations) in how each drug bound to the different types of serum, the overall pattern of binding was relatively similar across the seven mammalian species tested.

In conclusion, the study offers valuable insights on how different drugs bind to the serum in various mammalian species, which has implications for animal and human health, as well as drug design and dosage considerations. Phenobarbital and Quinidine showed the strongest binding, Procainamide showed the least, and Acetaminophen, Lidocaine, and Theophylline showed intermediate binding.