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Due to a great deal of biological activities, quinoline derivatives have drawn attention for synthesis and biological activities in the search for new anticancer drug development. In this work, a variety of substituted (phenyl, nitro, cyano, N‐oxide, and methoxy) quinoline derivatives (3‐13) were tested in vitro for their biological activity against cancer cell lines, including rat glioblastoma (C6), human cervical cancer cells (HeLa), and human adenocarcinoma (HT29). 6‐Bromo‐5‐nitroquinoline (4), and 6,8‐diphenylquinoline (compound 13) showed the greatest antiproliferative activity as compared with the reference drug, 5‐fluorouracil (5‐FU), while the other compounds showed low antiproliferative activity. 6‐Bromo‐5‐nitroquinoline (4) possesses lower cytotoxic activity than 5‐FU in HT29 cell line. Due to its the apoptotic activity 6‐Bromo‐5‐nitroquinoline (4) has the potential to cause cancer cell death.

Birds are the specific hosts of many tick species and may contribute to the dissemination of ticks and tick-borne pathogens throughout the world. Determination of ticks infesting birds and their pathogens are important for the detection of natural foci of human pathogens. Unfortunately, there is very limited information about the occurrence of ticks on birds and associated pathogens in Turkey. We performed a tick survey on three passerine bird species; Parus major, Sylvia atricapilla, and Turdus merula. Ticks collected from these birds were identified to species and tested for the presence of Borrelia, Ehrlichia, and Rickettsia species. Ixodes arboricola Schulze & Schlottke, Ixodes frontalis Panzer, and Ixodes ricinus L. were found on the birds. This is the first study reporting the presence of I. frontalis and I. arboricola on S. atricapilla and P. major, respectively, in Turkey. In addition, the results of polymerase chain reaction (PCR) with primers specific for gltA and ompA genes and DNA sequence analysis of positive PCR products indicated the presence of Candidatus Rickettsia vini in I. arboricola ticks. In conclusion, this is the first record of both I. arboricola and Candidatus Rickettsia vini in Turkey. Therefore, future studies needed to be conducted on the ticks infesting birds and their pathogens to elucidate the role of birds in the dispersal of tick species and tick-borne pathogens in Turkey.

2,3'-Biindole (2) was synthesized via bromination of indole (1) with molecular bromine and underwent simultaneous dimerization. Antiproliferative and cytotoxic activity of 2 was investigated in vitro on C6 (rat brain tumor), HeLa (human cervix carcinoma), and HT29 (human colon carcinoma) cells lines by using BrdU cell proliferation ELISA and lactate dehydrogenase (LDH) assays. In contrast to 5-fluorouracil (5-FU), 2,3'-biindole (2) significantly inhibited proliferation of HeLa and HT29 cell lines. According to LDH assay, the cytotoxicity of compound 2 was low on HT29 cell lines and high on HeLa and C6 cell lines. Moreover, 2 did not cause any DNA laddering on the DNA of tested cells; therefore, it is suggested that the mechanism of action of this compound may not involve apoptosis. In addition, 2 inhibited relaxation of supercoiled plasmid DNA by topoisomerase activity. Results of the present study indicates that biindole (2) may have promising anticancer and antitopoisomerase potential with an unknown mechanism of action.