Our central objectives are to understand why anoxia induces normal rat fibroblasts to express very high levels of retrovirus/retrotransposon related VL30 element RNA, and to understand the relationship of this process to malignant neoplasia. This is of particular interest in that VL30 elements have been incorporated into the genomes of two separate rat-derived murine sarcoma viruses, and VL30 RNA is very often found expressed at elevated levels in rodent cancers. 1. To evaluate if gene products are encoded within anoxia inducible VL30 RNA, we will sequence cDNA clones. Immune precipitation with antibodies to synthetic polypeptides will confirm that open reading frames are actually used. 2. Antipeptide sera to VL30 sequences detects at least one polypeptide of 61 kilodaltons, p61. Like VL30 itself, p61 is also anoxia inducible. p61 will be purified and partially sequenced, to facilitate cloning and to define relatedness to known proteins. Oligonucleotide probes will be used to evaluate if p61 is a non-VL30 gene which was incorporated into the VL30 region of Harvey carcoma virus. 3. With VL30 representing a multigene family with 50-100 copies per cell in rat DNA, we will use restriction mapping of cDNA clones to determine if only one or many of these elements are expressed in response to anoxia. 4. Does the anoxia inducible control site reside within the VL30 element itself, or elsewhere in the rat cell? Anoxia responsive rat VL30 DNA will be introduced into non-rat cells via retroviral pseudotyping or DNA transfection, and anoxia responsiveness elevated. 5. What is the nature of the human homolog of the anoxia inducible rat VL30? Is it a true VL30 element? Does it encode anything? Is it expressed as RNA anomalously in tumor tissues? The human VL30 homolog will be cloned and sequenced, and RNA transcripts quantitated in normal and tumor tissues. Together, these studies should advance our understanding of the roles played by VL30 elements in normal cells responding to anoxia. Our work should further clarify the role of VL30 elements in cancer.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA048828-03
Application #
3192773
Study Section
Pathology B Study Section (PTHB)
Project Start
1990-01-01
Project End
1993-12-31
Budget Start
1992-01-01
Budget End
1993-12-31
Support Year
3
Fiscal Year
1992
Total Cost
Indirect Cost
Name
Roswell Park Cancer Institute Corp
Department
Type
DUNS #
City
Buffalo
State
NY
Country
United States
Zip Code
14263
Estes, S D; Stoler, D L; Anderson, G R (1995) Normal fibroblasts induce the C/EBP beta and ATF-4 bZIP transcription factors in response to anoxia. Exp Cell Res 220:47-54
Russo, C A; Weber, T K; Volpe, C M et al. (1995) An anoxia inducible endonuclease and enhanced DNA breakage as contributors to genomic instability in cancer. Cancer Res 55:1122-8
Anderson, G R; Volpe, C M; Russo, C A et al. (1995) The anoxic fibroblast response is an early-stage wound healing program. J Surg Res 59:666-74
Estes, S D; Stoler, D L; Anderson, G R (1995) Anoxic induction of a sarcoma virus-related VL30 retrotransposon is mediated by a cis-acting element which binds hypoxia-inducible factor 1 and an anoxia-inducible factor. J Virol 69:6335-41
Firulli, B A; Anderson, G R; Stoler, D L et al. (1993) Anoxia-inducible rat VL30 elements and their relationship to ras-containing sarcoma viruses. J Virol 67:6857-62
Anderson, G R; Stoler, D L (1993) Anoxia, wound healing, VL30 elements, and the molecular basis of malignant conversion. Bioessays 15:265-72
Asch, H L; Vinci, R Z; Chang, J Y et al. (1993) Comparative expression of endogenous retrotransposons in adult mouse mammary gland during normal development and differentiation. Cell Biol Int 17:961-8
Asch, B B; Asch, H L; Stoler, D L et al. (1993) De-regulation of endogenous retrotransposons in mouse mammary carcinomas of diverse etiologies. Int J Cancer 54:813-9
Petrelli, N J; Hanna, S; Rodriguez-Bigas, M et al. (1992) The use of the major anoxic stress response protein P34, the K isozyme of lactate dehydrogenase, and carcinoembryonic antigen in the follow-up of patients with colorectal adenocarcinoma. Cancer 70:1834-7
Stoler, D L; Anderson, G R; Russo, C A et al. (1992) Anoxia-inducible endonuclease activity as a potential basis of the genomic instability of cancer cells. Cancer Res 52:4372-8

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