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. 1998 Feb;152(2):437–444.

The fetal form of the acetylcholine receptor distinguishes rhabdomyosarcomas from other childhood tumors.

S Gattenloehner 1, A Vincent 1, I Leuschner 1, S Tzartos 1, H K Müller-Hermelink 1, T Kirchner 1, A Marx 1
PMCID: PMC1857958  PMID: 9466570

Abstract

The fetal nicotinic acetylcholine receptor (AChR) of muscle is an oligomeric membrane protein with subunit composition alpha2betadeltagamma. After birth, the adult form, in which an epsilon-subunit replaces the gamma-subunit, predominates, and expression of the fetal form is limited to thymic myoid cells, extraocular muscles, and denervated striated muscle. We looked for expression of AChR in rhabdomyosarcomas and other childhood tumors by reverse transcription polymerase chain reaction and immunohistochemistry. mRNA for the AChR gamma-subunit was detected in all embryonal and alveolar rhabdomyosarcomas tested (n = 16) and in some tumors with a rhabdomyomatous component (n = 2) but not in other nonrhabdomyomatous tumors of childhood and adults (n = 45). The fetal form of the AChR was detected immunohistochemically in five of eight embryonal and four of eight alveolar rhabdomyosarcomas and in two Wilms' tumors with a rhabdomyomatous component but not in other tumors or in normal muscle. We conclude that reverse transcription polymerase chain reaction for AChR gamma-subunit could be useful for the diagnosis of rhabdomyosarcoma of childhood and for the detection of micrometastases and minimal residual disease. In addition, the fetal AChR protein is the first extracellular tumor marker that can distinguish rhabdomyosarcomas from nonrhabdomyomatous tumors and from normal muscle. Our findings, therefore, imply that the fetal AChR may be a target for in vivo imaging and, as AChR internalization and degradation is increased by antibody-induced cross-linking, may also provide a sensitive and specific target for immunotherapeutic strategies.

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