Abstract:
:We have studied the production and release of cholecystokinin (CCK) forms by rat medullary thyroid cancer (MTC) in vivo. MTC cells were inoculated s.c. into 8 Wag-Rij rats. One month later, after i.v. injection of calcium plasma levels of CCK, calcitonin and tissue contents of gastrin and calcitonin were determined by radioimmunoassay (RIA), immunocytochemistry, and high-pressure liquid chromatography (HPLC). The tumors were passed 4 times to 8 rats in 1-month intervals fasting levels of CCK in control rats were unaffected by calcium stimulation, and in tumor-bearing rats, plasma CCK was elevated in 3 out of 4 passages, falling to normal levels at the end of passage 4. Hypercalcemia had no effect on plasma levels of CCK in tumor-bearing rats, but did stimulate the release of calcitonin in both control and some tumor-bearing rats in later passages. CCK-8 sulfate was found in all 4 tumor passages but not CCK-33/39. We conclude that rat MTC synthesizes and releases CCK-8, but unlike calcitonin, release of CCK appears unresponsive to calcium stimulation.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Poston GJ,Draviam EJ,Seitz PK,Rajaraman S,Alexander RW,Cooper CW,Townsend CM Jr,Thompson JCdoi
10.1002/ijc.2910480510subject
Has Abstractpub_date
1991-07-09 00:00:00pages
689-92issue
5eissn
0020-7136issn
1097-0215journal_volume
48pub_type
杂志文章abstract::The autophagy lysosome pathway is essential to maintain cell viability and homeostasis in response to many stressful environments, which is reported to play a vital role in cancer development and therapy. However, the association of genetic alterations of this pathway with risk of cancer remains unclear. Based on geno...
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abstract::We previously reported that some single nucleotide polymorphisms (SNPs) of candidate genes involved in the MTOR complex1 (MTORC1) were associated with risk of gastric cancer (GCa). In the present study, we further evaluated associations of eight potentially functional SNPs of MTOR, MLST8 and RPTOR with survival of 100...
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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journal_title:International journal of cancer
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