60, 61 In addition, the gene expression of SPDEF and AGR2, 2 genes implicated in IL13-dependent formation of mucus-secreting pulmonary goblet cells, 62, 63 are increased in smokers versus non-smokers.
Trefoil factor-2 (Tff2) is an allergen-induced gene regulated by TH2 cytokines in the lung that promotes human bronchial epithelial cell migration and formation of mucus-producing airway cells (Nikolaidis et al. 2006).
The effects of which can potentially induce the formation of viscous mucus and hinder proper mucus hydration and dispersion, leading to impaired mucociliary transport in various epithelial mucosa.
Regulated order-to-disorder transitions of Mucin-2 are important in the formation of colon mucus aggregates.
The defective protein impairs water movement across epithelia leading to formation of viscous mucus that obstructs the airways of the lungs and ducts of the pancreas.
This causes a compensatory influx of sodium to maintain electroneutrality and a consequent influx of water, extracellular dehydration, and formation of thick mucus in the airways [ 7].
Blunting the acute phase of stimulated mucin secretion in this setting might prevent formation of concentrated mucus that cannot be cleared by ciliary action and therefore contributes to airflow obstruction [ 1, 49, 50, 51].
Saponins and triterpenoids have been reported to have antiulcer activity in several experimental models by the formation of protective mucus on the gastric mucosa and also protect the mucosa from acid effects by selectively inhibiting prostaglandin [ 35, 36].
Since secreted gel-forming mucins are widely acknowledged as an important component in the formation of viscoelastic mucus in stomach and intestine to protect the mucosal epithelium against acidic and proteolytic damages [ 67], the absence of gastric juices, hydrochloric acid and digestive enzymes in the pre-stomach may explain this lack of expression.
During bacterial infection there is formation of pus or mucus could become bloody, altering most physical and optical properties.
