Biomedical subjects

P Pystynen

Publications and source records attributed to P Pystynen.

At least 55 records · Page 3Linked to original sources

PubMed1975

[Cervical status and subjective symptoms in the normal pregnancy].

In 426 unselected pregnant women who came into the routine examination included in the maternity care and who were grouped according to the week of gestation the cervical status was examined and the subjective symptoms were observed. Attention was also paid to the correspondence between the occurrence of the subjective symptoms and the change in the cervical status. In total 984 examinations were carried out. Before the 33rd week of gestation no open internal orifice of the cervix uteri were found. All parities in total the cervix had become shorter (less than or equal to 2 cm) in 7,0 per cent of the cases before the 33rd week of gestation. Subjective symptoms occurred in 19,1 per cent of the cases. Towards the end of the gestational period the changes in the cervical status and the subjective symptoms became more frequent. In all the groups of gestational week the cervical status became pathologic significantly more frequently in pregnancies with subjective symptoms than in pregnancies with no symptoms.

Cervix Uteri↗

PubMed1975

Steroid binding properties of estradiol receptors in human breast cancer.

The incidence of a specific estradiol receptor among the Finnish breast cancer patients was investigated using methods involving dextran-coated charcoal or sucrose density gradient centrifugation techniques. An estradiol receptor was detected in 20 (71%) out of the 28 tumor specimens studied with the following binding site concentrations: 100-1000 fmoles/mg cytosol protein in 12 patients; 10-99 fmoles/mg cytosol protein in 6 patients and below 10 fmoles/mg cytosol protein in 2 patients the lowest detectable level being about 5 fmoles/mg cytosol protein. The apparent intrinsic association constant of the receptor for estradiol-17 beta ranged from 0.4-32 X 10(10) liters/mole in different breast cancer specimens. Estradiol receptor concentration did not seem to correlate well with the age of the patients or the microscopic structure of the tumor. The ligand-binding specificity of the receptor was studied with 25 different estrogen derivatives in 6 separate tumor specimens. The binding proteins in all these tumors showed very similar ligand specificities, despite differences in their histological types and estradiol-binding site concentrations. The phenolic hydroxyl group at C--3 was essential for an effective binding by the receptor, whereas certain modifications in the D-ring structure were well tolerated. As is the case with other steroid receptors, certain hydrophobic substituents seemed to increase the binding of the ligand by the breast cancer estradiol receptor. The in vitro binding affinity and the in vivo biological (estrogenic) potency of some of the steroids investigated did not correlate very well.

Adsorption↗

PubMed1974