N. Tanda et al., IL-1-BETA AND IL-6 IN MOUSE PAROTID ACINAR-CELLS - CHARACTERIZATION OF SYNTHESIS, STORAGE, AND RELEASE, American journal of physiology: Gastrointestinal and liver physiology, 37(1), 1998, pp. 147-156
Synthesis, storage, and secretion of the proinflammatory cytokine inte
rleukin-1 beta (IL-1 beta) and the anti-inflammatory cytokine IL-6 hav
e not been established in normal exocrine gland secretory cells. Parot
id glands and isolated acinar cells prepared from BALB/c mice were hom
ogenized for RNA isolation and reverse transcription-polymerase chain
reaction (RT-PCR). IL-1 beta and IL-6 enzyme-linked immunosorbent assa
ys (ELISAs) were done on supernatants prepared from mouse parotid acin
ar cell (MPAC) preparations unstimulated or stimulated between 0 and 1
0 min with 10(-5) M norepinephrine at 37 degrees C. MPACs were fixed i
n paraformaldehyde, frozen sectioned for light and electron microscopy
, and labeled with antibodies to IL-1 beta and IL-6. Mouse specific ri
boprobes to IL-1 and IL-6 were used for in situ hybridization. RT-PCR
yielded the expected IL-1 (336-bp) and IL-6 (614-bp) mRNA products. By
ELISA, stimulated MPACs showed a significant increase in IL-1 beta (P
< 0.03) and IL-6 (P < 0.01) release into supernatants by 10 min that
paralleled the time course of amylase release. In situ hybridization s
howed the presence of transcripts for IL-1 and IL-6 in glandular epith
elial cells. Gold-labeled IL-1 beta and IL-6 were significantly higher
(P < 0.01) in granules than in the nucleus and cytoplasm. This study
shows that MPACs synthesize IL-1 beta and IL-6 and release these cytok
ines from their granules after alpha- and beta-adrenergic stimulation.