[Autonomic nervous system and pancreas. (Analysis of the influence of different types of autonomic denervation in glandular regeneration phenomena and the interactions of the exocrine-endocrine-Axis)].
The present tests, in male Wistar rats, center around the trophic and functional changes of the pancreatic gland (R G), both exocrine and endocrine, induced by different types of autonomic nervous interruptions. First Group of Tests: Following one year celiac ganglionectomy (CG), nonpancreatectomized (Non-Pt) rats showed, basally, in blood, a drop of glucose (G), without changes of insulin (I). At autopsy, the CG animals showed an increase of the pancreatic we weight, of the total protein, of the RNA but not DNA. In the Pt. 95% rats, superimposing CG triggered, on the one hand, a drop to control values of the raised G blood levels, and on the other, a rise of I Besides, in feces, a rising of chymotrypsin concentration. At autopsy, in the PG, an increase of total protein and of RNA. Second Group of Tests: CG, after 6 months, induced, in blood, both basally and a 2 h glucose tolerance test, significant opposite enzyme activities changes in respect to C. Indeed, as amylase (A) was increased, that of lipase (L) was depressed. When alcohol feeding (AF) was superimposed to CG rats, a reversal of the L values was observed. The latter reached levels significantly higher those of the C. In in-vitro tests, the isolated islets of CG disclosed to release more I to the bath medium than those of the C animals. Third Group of Tests: Analyzing, in conscious animal, the L excretory changes in the basal bile pancreatic secretion (BB-PS) induced by chronic (2 months interruption of the autonomic nervous innervation of the PG, it was found that CG, truncal vagotomy (V), the association of CG + V, peri-Vaterian duodenotomy (PV-D), but not bilateral splachicectomy (Spl), inhibit, significantly the L output. It was also shown that superimosing AF to the V or CG + V animals reverted to C values the I depressed levels. In acute interruptions (24 h) of the autonomic nervous innervation of the PG: CG, V, P. V-D, the depression in the BBPS is highly significant, more than 40%. From these three sets of experiments it is concluded that: Firstly, CG increases the regenerative and functional capacity of both the exocrine pancreas. This is distinctively evident when the secretory mass is reduced like in the Pt. 95% series of animals. CG probably exerts its effects suppressing the releasing of some negative reins: adrenergic, pepdidergic (galanin). Secondly, CG evokes modifications of the normal Islet-pancreon inter-relationships. The rising of A and the drop of L in blood elicited by this type of autonomic nervous interruption probably reflects an increased release of I by the Langerhans islet. Thirdly, CG, the same as V. CG + V and P.V-D, but not Spl, depress the intrapancreatic cholinergic tone. This might by at the basis of the depression of L excretion in the BB-PS. The reversion to C Through the coupling of chronic alcohol intoxication to the autonomic decentralized PG would be a reflection of an increased sensitivity to ethanol of the intrapancreatic ganglionic neurons. The augmented acetylcholine release at the nerve terminal would lead to a high intrapancreatic cholinergic tone that, in the end, might be at the basis of the reversal changes induced in the autonomic decentralized PG by the chronic ethanol intoxication.
Tiscornia
M O
MO
Programa de Estudios Pancreáticos, Hospital de Clínicas, Facultad de Medicina de Buenos Aires.
Lehmann
E
E
De Hamamura
S S
SS
Negri
G
G
Otero
G
G
Waisman
H
H
D000818:Animals; D017763:Autonomic Denervation; D001341:Autonomic Nervous System / Q000502:physiology* / Q000601:surgery; D002447:Celiac Plexus / Q000502:physiology / Q000601:surgery; D000431:Ethanol / Q000633:toxicity; D015171:Ganglionectomy; D007328:Insulin / Q000378:metabolism; D000078790:Insulin Secretion; D007515:Islets of Langerhans / Q000378:metabolism; D008049:Lipase / Q000378:metabolism; D008297:Male; D010179:Pancreas / Q000294:innervation / Q000502:physiology* / Q000601:surgery; D010180:Pancreatectomy; D051381:Rats; D017208:Rats, Wistar; D012038:Regeneration; D014628:Vagotomy
D007328:Insulin; D000431:Ethanol; D008049:Lipase