Dipeptidyl peptidase
Dipeptidyl Peptidase
Dipeptidyl peptidase (DPP) is a type of enzyme that plays a crucial role in the regulation of various physiological processes in the human body. These enzymes are involved in the cleavage of dipeptides from the N-terminus of polypeptides, which is essential for the activation or inactivation of many bioactive peptides.
Types of Dipeptidyl Peptidases
There are several types of dipeptidyl peptidases, each with distinct functions and substrate specificities. The most well-known types include:
- Dipeptidyl Peptidase-4 (DPP-4)
- Dipeptidyl Peptidase-8 (DPP-8)
- Dipeptidyl Peptidase-9 (DPP-9)
Dipeptidyl Peptidase-4 (DPP-4)
DPP-4 is a serine exopeptidase that is widely expressed in various tissues, including the intestine, liver, and kidney. It is involved in the inactivation of incretin hormones such as glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP), which are important for the regulation of blood glucose levels.
Dipeptidyl Peptidase-8 and Dipeptidyl Peptidase-9
DPP-8 and DPP-9 are closely related enzymes that are less well understood compared to DPP-4. They are expressed in various tissues and are thought to play roles in immune regulation and cell proliferation.
Physiological Functions
Dipeptidyl peptidases are involved in numerous physiological processes, including:
- Regulation of glucose metabolism
- Modulation of the immune system
- Control of inflammation
- Regulation of appetite and satiety
Clinical Significance
Dipeptidyl peptidases, particularly DPP-4, have significant clinical implications. Inhibition of DPP-4 is a therapeutic strategy for the treatment of type 2 diabetes mellitus. DPP-4 inhibitors, also known as "gliptins," help to prolong the action of incretin hormones, thereby enhancing insulin secretion and lowering blood glucose levels.
DPP-4 Inhibitors
DPP-4 inhibitors are a class of oral hypoglycemic agents used in the management of type 2 diabetes. Some common DPP-4 inhibitors include:
Potential Side Effects
While DPP-4 inhibitors are generally well-tolerated, they may cause side effects such as:
Research and Development
Ongoing research is focused on understanding the broader roles of dipeptidyl peptidases in health and disease, as well as developing new therapeutic agents targeting these enzymes for various conditions beyond diabetes.
See Also
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