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Related Experiment Video

Updated: Jun 7, 2026

In Vitro Assay to Measure Phosphatidylethanolamine Methyltransferase Activity

In Vitro Assay to Measure Phosphatidylethanolamine Methyltransferase Activity

Published on: January 5, 2016

PACAP-regulated phenylethanolamine N-methyltransferase gene expression.

Tze Chun Tai¹, David C Wong-Faull, Robert Claycomb

¹Department of Psychiatry, Harvard Medical School and Laboratory of Molecular and Developmental Neurobiology, McLean Hospital, Belmont, Massachusetts, USA.

Journal of Neurochemistry

|November 3, 2010

Summary

This summary is machine-generated.

Pituitary adenylate cyclase activating polypeptide (PACAP) activates the phenylethanolamine N-methyltransferase (PNMT) gene promoter. This activation relies on early growth response protein (Egr-1) and activator protein 2 (AP-2) transcription factors, coordinated via specific signaling pathways.

Related Experiment Videos

Last Updated: Jun 7, 2026

In Vitro Assay to Measure Phosphatidylethanolamine Methyltransferase Activity

In Vitro Assay to Measure Phosphatidylethanolamine Methyltransferase Activity

Published on: January 5, 2016

Area of Science:

Molecular Endocrinology
Gene Regulation
Neurobiology

Background:

Pituitary adenylate cyclase activating polypeptide (PACAP) is a neuropeptide with diverse physiological roles.
Phenylethanolamine N-methyltransferase (PNMT) is a key enzyme in catecholamine synthesis.
Understanding the regulation of PNMT gene expression is crucial for neuroendocrine research.

Purpose of the Study:

To elucidate the molecular mechanisms by which PACAP regulates the rat PNMT gene promoter.
To identify the transcription factors and signaling pathways involved in PACAP-mediated PNMT gene induction.

Main Methods:

Utilized deletion mutation analysis of the rat PNMT promoter in PC12 cells.
Employed siRNA knock-down to assess the roles of Egr-1 and AP-2.
Investigated signaling pathways using specific inhibitors (MDL12,330A, H89, U73122).
Analyzed mRNA and protein levels of key factors and transcription factor binding.

Main Results:

PACAP activates the proximal -893 bp of the rat PNMT promoter via PACAP type I receptors.
The -392 bp region, containing Egr-1, Sp1, and AP-2 binding sites, is sufficient for PACAP activation.
Egr-1 is essential, while AP-2 sites (-650, -573, -103 bp) contribute cooperatively to PACAP stimulation.
PACAP-induced PNMT gene expression is mediated by cAMP-PKA and PLC signaling pathways.

Conclusions:

PACAP stimulates PNMT gene expression through PACAP type I receptors and specific intracellular signaling.
Egr-1 and AP-2 act as cooperative transcription factors in PACAP-mediated PNMT gene regulation.
This study establishes a novel link between AP-2 transcription factors and PACAP-induced gene expression.