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Marked variation in responses to long-term nitric oxide inhibition during pregnancy in outbred rats from two different colonies.
Am J Obstet Gynecol. 2001 Mar; 184(4):686-93.AJ

Abstract

OBJECTIVE

Some but not all studies have shown that long-term nitric oxide synthase inhibition during pregnancy induces symptoms similar to those of preeclampsia that include hypertension, proteinuria, and intrauterine growth restriction. This study was undertaken to compare the effects of long-term nitric oxide synthase inhibition during pregnancy on blood pressure and fetal weight between Sprague-Dawley rats from outbred colonies of two different suppliers.

STUDY DESIGN

Osmotic minipumps were inserted on day 10 or day 17 of pregnancy in Sprague-Dawley rats obtained from Charles River Laboratories, Inc, Wilmington, Mass, or Harlan Sprague Dawley, Inc, Indianapolis, Ind. The pumps were set to deliver vehicle only (control group) or N omega-nitro-L -arginine methyl ester (a nitric oxide synthase inhibitor) at a rate of 50 mg/d until postpartum day 7. Systolic blood pressures were measured daily with the tail-cuff method. Neonatal weights and survival were recorded.

RESULTS

N omega-nitro-L -arginine methyl ester infusion initiated on gestational day 10 increased blood pressure relative to control levels in all rats studied. Harlan rats were much more sensitive to the hypertensive effect of N omega-nitro-L -arginine methyl ester. When N omega-nitro-L -arginine methyl ester infusion was initiated on gestational day 17, blood pressure increased only in Harlan rats. Pups born to Harlan rats treated with N omega-nitro-L -arginine methyl ester had lower birth weights and a higher stillbirth rate than did pups of Charles River rats. The degree of hypertension was significantly correlated with the deleterious effects of N omega-nitro-L -arginine methyl ester on the fetuses.

CONCLUSION

Within the same strain of rats the effects of long-term nitric oxide synthase inhibition on blood pressure and fetal outcome depended on the original animal colony, with animals from Harlan Sprague Dawley being more sensitive than those from Charles River Laboratories. This difference in response between animals from different suppliers is most likely caused by genetic differences inbred into the strain. In addition to explaining some of the reported inconsistencies between laboratories, these results may also provide insights into the genetic basis of preeclampsia.

Authors+Show Affiliations

Division of Reproductive Sciences, Department of Obstetrics and Gynecology, University of Texas Medical Branch, 77555-1062, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

11262473

Citation

Buhimschi, I A., et al. "Marked Variation in Responses to Long-term Nitric Oxide Inhibition During Pregnancy in Outbred Rats From Two Different Colonies." American Journal of Obstetrics and Gynecology, vol. 184, no. 4, 2001, pp. 686-93.
Buhimschi IA, Shi SQ, Saade GR, et al. Marked variation in responses to long-term nitric oxide inhibition during pregnancy in outbred rats from two different colonies. Am J Obstet Gynecol. 2001;184(4):686-93.
Buhimschi, I. A., Shi, S. Q., Saade, G. R., & Garfield, R. E. (2001). Marked variation in responses to long-term nitric oxide inhibition during pregnancy in outbred rats from two different colonies. American Journal of Obstetrics and Gynecology, 184(4), 686-93.
Buhimschi IA, et al. Marked Variation in Responses to Long-term Nitric Oxide Inhibition During Pregnancy in Outbred Rats From Two Different Colonies. Am J Obstet Gynecol. 2001;184(4):686-93. PubMed PMID: 11262473.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Marked variation in responses to long-term nitric oxide inhibition during pregnancy in outbred rats from two different colonies. AU - Buhimschi,I A, AU - Shi,S Q, AU - Saade,G R, AU - Garfield,R E, PY - 2001/3/23/pubmed PY - 2001/5/1/medline PY - 2001/3/23/entrez SP - 686 EP - 93 JF - American journal of obstetrics and gynecology JO - Am J Obstet Gynecol VL - 184 IS - 4 N2 - OBJECTIVE: Some but not all studies have shown that long-term nitric oxide synthase inhibition during pregnancy induces symptoms similar to those of preeclampsia that include hypertension, proteinuria, and intrauterine growth restriction. This study was undertaken to compare the effects of long-term nitric oxide synthase inhibition during pregnancy on blood pressure and fetal weight between Sprague-Dawley rats from outbred colonies of two different suppliers. STUDY DESIGN: Osmotic minipumps were inserted on day 10 or day 17 of pregnancy in Sprague-Dawley rats obtained from Charles River Laboratories, Inc, Wilmington, Mass, or Harlan Sprague Dawley, Inc, Indianapolis, Ind. The pumps were set to deliver vehicle only (control group) or N omega-nitro-L -arginine methyl ester (a nitric oxide synthase inhibitor) at a rate of 50 mg/d until postpartum day 7. Systolic blood pressures were measured daily with the tail-cuff method. Neonatal weights and survival were recorded. RESULTS: N omega-nitro-L -arginine methyl ester infusion initiated on gestational day 10 increased blood pressure relative to control levels in all rats studied. Harlan rats were much more sensitive to the hypertensive effect of N omega-nitro-L -arginine methyl ester. When N omega-nitro-L -arginine methyl ester infusion was initiated on gestational day 17, blood pressure increased only in Harlan rats. Pups born to Harlan rats treated with N omega-nitro-L -arginine methyl ester had lower birth weights and a higher stillbirth rate than did pups of Charles River rats. The degree of hypertension was significantly correlated with the deleterious effects of N omega-nitro-L -arginine methyl ester on the fetuses. CONCLUSION: Within the same strain of rats the effects of long-term nitric oxide synthase inhibition on blood pressure and fetal outcome depended on the original animal colony, with animals from Harlan Sprague Dawley being more sensitive than those from Charles River Laboratories. This difference in response between animals from different suppliers is most likely caused by genetic differences inbred into the strain. In addition to explaining some of the reported inconsistencies between laboratories, these results may also provide insights into the genetic basis of preeclampsia. SN - 0002-9378 UR - https://www.unboundmedicine.com/medline/citation/11262473/Marked_variation_in_responses_to_long_term_nitric_oxide_inhibition_during_pregnancy_in_outbred_rats_from_two_different_colonies_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0002-9378(01)59894-4 DB - PRIME DP - Unbound Medicine ER -