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Strain differences and inheritance of angiogenic versus angiostatic activity in oestrogen-induced rat pituitary tumours

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Abstract

In this study we investigated the control of the angiogenic/haemorrhagic phenotype of oestrogen-induced rat pituitary tumours of an F1 hybrid (F1) of Fischer 344 (F344) (tumour susceptible) and Brown Norway (tumour resistant) strains. F1 forms a pituitary tumour upon chronic oestrogen treatment, but microvessel count (MVC) is no greater than untreated. In other words, F1 MVC keeps pace with tissue growth during growth of an oestrogen-induced tumour. On the other hand, F344 showed a significant increase in MVC (P = 0.002) upon chronic oestrogen treatment during growth of a large pituitary tumour. F1 control vasculature showed features intermediate between the parent strains, while oestrogen-treated F1 pituitary has pronounced changes commensurate with vascular remodelling or angiogenic activity, along with regressive changes. In addition, oestrogen-treated F1 does not form the haemorrhagic lakes characteristic of oestrogen-treated F344. We conclude that F1, which has a 50-50 genetic composition of the tumour susceptibility and tumour resistance alleles, shows loss of angiostatic activity in the absence of an effective angiogenic stimulus. As a result it is unable to make the 'switch’ to the angiogenic phenotype.

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Authors and Affiliations

  1. Department of Biological Sciences and Center for Biomedical Research, Oakland University, Rochester, Michigan, USA

    Jyotsna Pandey, Danny Cracchiolo, Fay M. Hansen & Douglas L. Wendell

Authors
  1. Jyotsna Pandey
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  2. Danny Cracchiolo
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  3. Fay M. Hansen
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  4. Douglas L. Wendell
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Correspondence to Douglas L. Wendell.

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Pandey, J., Cracchiolo, D., Hansen, F.M. et al. Strain differences and inheritance of angiogenic versus angiostatic activity in oestrogen-induced rat pituitary tumours. Angiogenesis 5, 53–66 (2002). https://doi.org/10.1023/A:1021550211921

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