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J Oral Pathol Med. 2005 Jan;34(1):23-9.

Orofacial and gastrointestinal hyperplasia and neoplasia in smad4+/- and elf+/-/smad4+/- mutant mice.

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Oral Pathology Research Laboratory, Department of Veterans Affairs Medical Center, Washington, DC 20422, USA.



Smad4 is vital to the roles of Smads 2 and 3 in transforming growth factor-beta (TGF)-beta signal transduction, and inactivated Smad4 is common to human gastrointestinal cancers. The embryonic liver fodrin (ELF) is a beta-spectrin that facilitates the nuclear translocation of activated Smad4.


Smad4+/- mice, known to develop gastrointestinal cancer, were crossbred with elf+/- mice. The smad4+/- and smad4+/-/elf+/- offspring were autopsied as abnormalities developed.


In addition to polyps and adenocarcinomas of the stomach and duodenum, the smad4+/- mice developed squamous cell carcinomas of the skin, oral mucosa and forestomach, benign neoplasms of connective tissue and lacrimal gland, and a lymphoma. The smad4+/-/elf+/- mice developed extensive hyperplasia and neoplasia of the gastric mucosa.


These findings indicate that investigating interactions among smad4, elf, and other genes involved in TGF-beta signaling should be useful in further delineating the processes of neoplasia in a wide variety of tissues.

[Indexed for MEDLINE]

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