Presence and comparison of angiotensin converting enzyme in commercial cell culture sera.

This study explored the presence of angiotensin-converting enzyme (ACE) in commercial cell culture sera, which are used in creating mediums for cell growth and differentiation. Researchers found that ACE can affect the activity of biological peptides when tested on cell lines in laboratory conditions.

Objective and Importance of Study

• The aim of the researchers was to inform cell culture users about the presence of ACE in commercial sera.
• They wished to provide data that could help resolve issues related to the development of peptides, which are potential therapeutic agents.

Extraction and Analysis of Enzymes

• Enzymes were purified from various sources such as foetal bovine, adult bovine, foetal equine, adult equine, and human sera.
• These enzymes demonstrated molecular weights hovering around 170 kilo Daltons.

Influence of Captopril and Lisinopril

• Two drugs capable of inhibiting ACE, captopril and lisinopril, were found to inhibit enzyme activities at nanomolar concentrations, providing a means of managing the influence of ACE.

Dealing with Different Peptides

• The enzymes were capable of breaking down angiotensin I, bradykinin, and epidermal mitosis inhibiting pentapeptide, albeit with varying levels of efficiency.

Effects of Heat Inactivation

• Subjecting the commercial sera to heat inactivation at 56 degrees Celsius for 30 minutes led to a reduction in ACE activity ranging from 35% to 80%.

Implication of Findings

• The presence of ACE activity in commercial cell culture sera can affect how biological peptides behave when tested on in vitro cultured cell lines.
• This could significantly influence the results of experiments that use these cell lines, as the ACE could alter the functionality of the peptides being tested.