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Biomedical subjects

J R Peña

Publications and source records attributed to J R Peña.

8 recordsLinked to original sources
PubMed1999

Fibrous hamartoma of infancy.

Fibrous harmartoma of infancy is a benign soft tissue tumor that occurs in the first few years of life. Although the lesion is not distinctive clinically, it has a characteristic microscopic appearance. Only 12 cases of fibrous hamartoma of infancy have been reported in the dermatology literature.

Female↗
PubMed1996

mdm2 deletion does not alter growth characteristics of p53-deficient embryo fibroblasts.

The mdm2 gene encodes a protein that is necessary for the negative regulation of p53 function in vivo. Deletion of the mdm2 gene in mice results in early embryonic death while concomitant mdm2 and p53 deletion results in viable offspring. The viability of these mice prompted us to ask if MDM2 had an important growth regulatory function independent of p53. We established mouse embryo fibroblasts null for both p53 and mdm2 and compared them with p53-null fibroblasts. The cells did not differ in their growth rates or their ability to bypass a G1 arrest. Both cell lines formed colonies efficiently when plated at low density and showed a similar degree of genetic instability. Thus, the analysis of several growth parameters indicated no difference between p53-null and p53/mdm2-null cell lines.

Animals↗