Related Experiment Videos
Suppressive effect of ulinastatin on plasma fibronectin depression after cardiac surgery
M Haniuda1, M Morimoto, A Sugenoya
1Department of Surgery, Shinshu University School of Medicine, Matsumoto, Japan.
Insights
Ulinastatin prevents the drop in plasma fibronectin after cardiac surgery by inhibiting proteolytic enzymes. This supports a healthy reticuloendothelial system and phagocytic function post-operation.
Area of Science:
- Biochemistry
- Immunology
- Surgical Research
Background:
- Plasma fibronectin is an opsonic glycoprotein crucial for reticuloendothelial system (RES) phagocytic clearance.
- Postoperative decreases in plasma fibronectin after cardiac surgery are often attributed to opsonic consumption.
- The role of proteolytic enzymes in fibronectin depletion requires further investigation.
Purpose of the Study:
- To investigate the effect of ulinastatin on plasma fibronectin levels in patients undergoing cardiac surgery.
- To determine if ulinastatin can prevent the postoperative depression of plasma fibronectin.
- To elucidate the mechanism by which ulinastatin influences fibronectin levels.
Main Methods:
- Administration of ulinastatin to patients post-cardiac surgery.
- Measurement of plasma fibronectin levels.
- Assessment of ulinastatin's inhibitory activity on proteolytic enzymes.
Main Results:
- Ulinastatin administration inhibited the postoperative decline in plasma fibronectin levels.
- Plasma fibronectin levels were maintained within the normal range in patients treated with ulinastatin.
- The protective effect of ulinastatin on fibronectin levels was linked to its inhibition of proteolytic enzymes.
Conclusions:
- The decrease in plasma fibronectin after cardiac surgery may primarily result from excessive proteolytic enzyme activity.
- Ulinastatin effectively preserves plasma fibronectin levels by inhibiting these enzymes.
- Prophylactic ulinastatin administration may support a functional RES and phagocytic system in major surgical patients.
Abstract:
Plasma fibronectin, an opsonic glycoprotein, is known to modulate the reticuloendothelial phagocytic clearance of nonbacterial and, possibly, bacterial particulates. The decreased plasma fibronectin levels seen after cardiac surgery have been considered to derive mainly from opsonic consumption. In the present study, we demonstrated that the administration of ulinastatin, a human urinary trypsin inhibitor, to patients after cardiac surgery not only inhibited the postoperative depression of plasma fibronectin levels, but also maintained the plasma fibronectin level within the normal range. This effect apparently resulted from the inhibitory activity of ulinastatin on the proteolytic enzymes released after operation. This result suggests that the decreased plasma fibronectin level noted after cardiac surgery may derive mostly from excessive proteolytic enzymes. Our observation also indicates that the prophylactic administration of ulinastatin to patients undergoing major operations will result in a favorably functional reticuloendothelial phagocytic system.