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Abstract
The results of this study indicate that the liver has not lost its capacity to regenerate
following portacaval shunt, and the degree of restoration is not significantly different
from that observed in intact animals following partial hepatectomy. Such conclusions
result from the use of shunt animals, rather than intact normal animals, as suitable
controls for the assessment of regeneration. The effect upon the liver of portacaval
shunt alone has thus been distinguished from that following combined shunt and partial
hepatectomy.
Considerable atrophy results from restriction of portal blood flow. Such livers are
capable of restoration of hepatic mass and protein, and, as evidenced by mitotic counts
and incorporation of P32 into DNA, parenchymal cells undergo division in a fashion comparable to that observed
following liver resection in animals with an intact circulation. Contrary to the reports
of others, it appears from these findings that portal blood, or blood per se, traversing
the liver via the portal circulation, is not so much a prerequisite for hepatic restoration
as it is for the inhibition of hepatic atrophy.
Liver atrophy was slight after side-to-side shunt, as compared with that after end-to-side
shunt. The degree of hepatic (and protein) restoration following partial resection
was, however, similar in both groups (65 per cent and 61 per cent). Possible clinical
significance of these findings is being entertained.
No evidence was obtained to support the importance of a humoral factor in the process
of liver regeneration in portacaval shunt animals. The injection of plasma from hepatectomized
rats into single shunt animals and partial hepatectomy, with or without antecedent
portacaval shunt in one member of a parabiotic pair, failed to disclose significant
differences in the number of mitoses or DNA-P specific activity of liver compatible
with the presence of such a factor.
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Article info
Footnotes
☆Supported by United States Public Health Service Grants No. A-4651 and No. A-369.
☆☆Read at the Twenty-third Annual Meeting of the Society of University Surgeons, Cleveland, Ohio, Feb. 8–10, 1962.
Identification
Copyright
© 1962 Published by Elsevier Inc.