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The lacrimal gland is primarily responsible for the aqueous portion of the tear film. Simultaneous addition of cholinergic agonists or growth factors with cAMP-dependent agonists potentiates secretion. Recent investigations revealed that cAMP decreases p44/p42 mitogen-activated protein kinase (MAPK) activity stimulated by cholinergic agonists and growth factors that could account for this potentiation. In this study the authors identify the signal transduction pathway used by cAMP to inhibit MAPK activity.

investigative ophthalmology and visual science

Identification of the Raf-1 Signaling Pathway Used by cAMP to Inhibit p42/p44 MAPK in Rat Lacrimal Gland Acini: Role in Potentiation of Protein Secretion