Enzymatic radioiodination of succinyl cyclic AMP tyrosine methyl ester by lactoperoxidase and radioimmunoassay for cyclic AMP.

نویسندگان

  • K Sato
  • Y Miyachi
  • A Mizuchi
  • N Ohsawa
  • K Kosaka
چکیده

A highly specific and simple radioimmunoassay for cyclic AMP with a sensitivity of 0.04 picomoles/tube has been developed according to the method of Steiner et al., using 125I-succinyl cyclic AMP tyrosine methyl ester as a tracer. The tracer with higher immunoactivities could be simply and constantly prepared by an enzymatic iodination procedure utilizing lactoperoxidase, radioactive iodide and hydrogen peroxide generated by glucose-glucose oxidase system, rather than by chloramine-T procedure.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Instability of succinyl ester linkages in O2'-monosuccinyl cyclic AMP-protein conjugates at neutral pH.

Chromatographic and immunological evidence is presented regarding the hydrolysis of the ester linkage of O2'-monosuccinyl cyclic AMP in neutral solutions. Such hydrolysis occurs whether the nucleotide derivative is present in free form in solution or conjugated through its succinyl carboxyl group via an amide bond to proteins. The latter process apparently occurs when succinyl cyclic AMP is con...

متن کامل

Radioimmunoassay for Cyclic Nucleotides

Sensitive and specific radioimmunoassays have been developed for cyclic adenosine 3’, 5’-monophosphate (CAMP), cyclic guanosine 3’ ,5’-monophosphate (cGMP), cyclic inosine 3’ ,5’-monophosphate (cIMP), and cyclic uridine 3’, 5’monophosphate (cUMP). These assays are based upon competition of the cyclic nucleotide with isotopically labeled cyclic nucleotide derivatives for binding sites on specifi...

متن کامل

Development of a radioimmunoassay for cyclic somatostatin: antibody production, comparative radioiodination, and dose-response curve.

Since somatostatin lacks a tyrosine residue that can be readily iodinated, three different radiolabeling procedures for synthetic cyclic Tyr^som'atostatin were compared with each other. In addition, cyclic somatostatin was radiolabeled with the Bolton-Hunter reagent. The radiolabeled antigens were purified by G-25 Sephadex adsorption chromatography and thus separated from unreacted components. ...

متن کامل

A homogeneous immunoassay for cyclic nucleotides based on chemiluminescence energy transfer.

A chemiluminescent derivative of cyclic AMP, aminobutylethylisoluminol succinyl cyclic AMP (ABEI-scAMP), was synthesized in order to develop a homogeneous immunoassay based on non-radiative energy transfer. ABEI-scAMP was chemiluminescent (5.1 X 10(18) luminescent counts X mol-1 at pH 13), pure (greater than 95%) stable and immunologically active. A conventional immunoassay was established usin...

متن کامل

MSH inhibits growth in a line of amelanotic hamster melanoma cells and induces increases in cyclic AMP levels and tyrosinase activity without inducing melanogenesis.

In Bomirski Ab amelanotic hamster melanoma cells, L-tyrosine and/or L-dopa induce increases in tyrosinase activity as well as synthesis of melanosomes and melanin. L-tyrosine also modifies melanocyte-stimulating hormone (MSH) binding. In this paper we show that in the Bomirski amelanotic melanoma system MSH and agents that raise intracellular cyclic AMP induce dendrite formation, inhibit cell g...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Endocrinologia japonica

دوره 23 3  شماره 

صفحات  -

تاریخ انتشار 1976