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Effects on growth after portal hypertension induced in young rats
Luiz Eduardo Correia Miranda1, Reginaldo Ceneviva, Hélio Vannucchi
1Department of Surgery and Anatomy, Ribeirão Preto Medical School, University, Ribeirão Preto, São Paulo, SP, Brazil. lecmiranda@terra.com.br
Insights
Portal hypertension in young rats did not cause lasting growth delays. Despite initial hindrances, rats recovered their growth rate, challenging previous hypotheses on growth deficits.
Area of Science:
- Pediatric Gastroenterology
- Developmental Biology
- Animal Models
Background:
- Physical growth retardation is observed in children with portal hypertension.
- Portosystemic shunting is hypothesized to cause metabolic changes leading to growth deficits.
Purpose of the Study:
- To investigate the impact of induced portal hypertension on the growth of young rats.
- To evaluate the metabolic and physiological effects of early-life portal hypertension.
Main Methods:
- Twenty young rats were divided into portal hypertension and sham operation groups.
- Growth parameters including diet intake, weight gain, and urinary creatinine were monitored over five weeks.
- Biochemical tests, prothrombin time, and hematocrit were analyzed post-surgery.
Main Results:
- Rats with induced portal hypertension showed an initial growth delay in the first week post-surgery.
- Growth rates normalized in subsequent weeks, with rats catching up to the control group.
- No significant differences were found in urinary creatinine, biochemical markers, or hematocrit between groups.
Conclusions:
- Early-stage induced portal hypertension in rats does not lead to sustained growth delay.
- The findings do not support the hypothesis that portal hypertension causes long-term growth deficits.
- This study suggests compensatory mechanisms may mitigate growth impacts of portal hypertension in young animals.
Background:
Physical growth retardation in children with hypertension portal was observed regardless of schistosomiasis. It has been suggested that the shunt of portal blood through portosystemic collateral vessels would result in metabolic consequences that would lead to the physical growth deficit observed.
Aim:
Study the effects of hypertension portal in the growth of young rats.
Methods:
The growth of 20 young rats, divided in the groups hypertension portal, n = 10, 103 +/- 3.7 g and sham operation n = 10, 102.6 +/- 3.4 g was evaluated throughout 5 weeks and the following parameters were under observation: quality of diet offered, diet ingestion, weight increase and urinary creatinine within 24 hours. At the end of the experiment, blood was taken for biochemical tests, prothrombin time and hematocrit and hypertension portal was measured.
Results/Conclusions:
Rats with hypertension portal induced at early stages of their lives present growth delay in the first week after surgery recovering their growth rhythm in the next weeks, catching up with the sham animals. Differences related to urinary creatinine excretion, biochemical tests and hematocrit were not observed. Such results are evidence against the hypothesis that the hypertension portal induced in early stages of rats lives would cause delay in their growth.
