Phospholipase D: regulation and functional significance

Area of Science:

• Biochemistry
• Cell Biology
• Signal Transduction

Background:

• Phospholipase D (PLD) hydrolyzes phosphatidylcholine (PC) in most tissues, indicating a significant role in cellular signaling.
• PLD activation mechanisms vary across tissues, suggesting potential isoform diversity.
• The enzymology and molecular biology of PLD remain largely uncharacterized.

Purpose of the Study:

• To summarize the known roles and significance of Phospholipase D (PLD) in cellular processes.
• To highlight areas where PLD activation is strongly implicated, such as mitogenesis and leukocyte hyperresponsiveness.
• To identify knowledge gaps and suggest future research directions concerning PLD function and downstream effectors.

Main Methods:

• Literature review and synthesis of existing research on Phospholipase D.
• Analysis of indirect evidence linking PLD activation to cellular functions.
• Identification of potential downstream signaling molecules and pathways involved in PLD-mediated effects.

Main Results:

• PLD plays a major role in phosphatidylcholine hydrolysis and signal transduction.
• PLD activation is linked to prolonged cellular function changes, notably in mitogenesis and leukocyte hyperresponsiveness.
• Phosphatidic acid (PA) is a likely second messenger, potentially acting via Ca(2+)-independent PKC isoforms.

Conclusions:

• PLD is a key enzyme in cellular signaling with significant roles in cell proliferation and immune cell function.
• Understanding the precise mechanisms and downstream targets of PLD is critical for elucidating its functional significance.
• Future research should focus on the molecular targets and signaling pathways influenced by PLD-generated products like PA.