nihan Verimli | Istanbul Medipol University (original) (raw)
Papers by nihan Verimli
Thrombosis Research, 2014
Journal of Photochemistry and Photobiology B: Biology
European Journal of Pharmaceutics and Biopharmaceutics
Applied Biochemistry and Biotechnology, 2019
Dense brush conformation-bearing theranostic agents are emerging as drug delivery systems due to ... more Dense brush conformation-bearing theranostic agents are emerging as drug delivery systems due to their higher ability to escape from reticuloendothelial system uptake which prolongs their in vivo circulation time. With the aim of developing dual therapy agent, 13-nm gold nanoparticles' (AuNPs) surfaces were coated with different amounts of polyethylene glycol (PEG) (SH-PEG-NH 2) to obtain dense brush conformation-bearing theranostic agents. Among the 14 different theranostic agent candidates prepared, the one hosting 1819 PEG per particle was selected as the most promising theranostic agent candidate based on structural conformation, stability, size, zeta potential, hemocompatibility, cell inhibition, and cell death pathway towards MCF-7 cell line. To test drug delivery efficiency of the developed PEGylated AuNP and to improve efficacy of the treatment, apoptotic peptide (AP) was covalently conjugated to NH 2 terminus of the PEG in various ratios to yield AuNP-AP conjugate. Among the prepared conjugates, the one having 1 nmol of peptide per milliliter of AuNP yielded the most promising results based on the same criteria as employed for PEGylated AuNPs. Besides, incorporation of AP to AuNP returned in superior efficacy of AP since it was possible to achieve 50% cell death with 1000 times less amount of AP alone.
Climacteric, 2011
Objective To determine the frequency of the vitamin D receptor (VDR) gene polymorphisms BsmI, Apa... more Objective To determine the frequency of the vitamin D receptor (VDR) gene polymorphisms BsmI, ApaI, TaqI and FokI and their associations with bone mineral density (BMD) in postmenopausal Turkish women. Design One hundred and thirty healthy postmenopausal women and 130 premenopausal healthy women acting as controls were included in the study. The BsmI, FokI, ApaI and TaqI polymorphisms in the VDR gene were studied by polymerase chain reaction-restriction fragment length polymorphism method. The BMD of the lumbar vertebrae and femur neck were measured by dual-energy X-ray absorptiometry. Comparisons between the groups were performed using the paired t-test and ANOVA. w 2 or contingency tables were used to analyze qualitative results. Results Genotypes BB, Bb and bb occurred in premenopausal women with frequencies of 16.92%, 50% and 33.08% and in postmenopausal women with frequencies of 16.92%, 56.15% and 26.92%, respectively. Genotypes FF, Ff, ff occurred in premenopausal women with frequencies of 47.69%, 42.31% and 10% and in postmenopausal women with frequencies of 50.77%, 42.31% and 6.92%, respectively. Genotypes AA, Aa, aa occurred in premenopausal women with frequencies of 23.85%, 56.15% and 20% and in postmenopausal women with frequencies of 26.15%, 46.15% and 27.70%, respectively. Genotypes TT, Tt and tt occurred in premenopausal women with frequencies of 37.69%, 45.38% and 16.92% and in postmenopausal women with frequencies of 39.23%, 45% and 15.38%, respectively. There was no difference in the frequencies of VDR gene polymorphisms between premenopausal and postmenopausal women. BMD measurements were not different between genotypes in premenopausal and postmenopausal women. Conclusions The VDR gene BsmI, FokI, ApaI and TaqI polymorphisms have no major influence on bone mineral density in our group of postmenopausal women.
Amaç: Bu tezin amacı GAS6’nın akromegali ve komplikasyonlarıyla ilişkisi olup olmadığını inceleme... more Amaç: Bu tezin amacı GAS6’nın akromegali ve komplikasyonlarıyla ilişkisi olup olmadığını incelemektir. Bu amaca ulaşmak için GAS6 genine ait c.834+7G>A polimorfizmi ve serum GAS6 protein konsantrasyonu; insülin direnci, GH, IGF-1 ve hastalık süresi gibi çeşitli parametreler birlikte incelenmiştir. Gereç ve Yöntem: Marmara Üniversitesi Tıp Fakültesi Endokrinolji Bilim Dalına başvuran hastalardan, akromegali grubu (n=48) ve sağlıklı gönüllülerden kontrol grubu (n=50) oluşturulmuştur. GAS6 genine ait c.834+7G>A polimorfizmi, PZR-RLFP yöntemiyle çalışılmıştır. Serum GAS6 konsantrasyonu ELISA (CUSABIO Human GAS6 ELISA Kit) yöntemiyle belirlenmiştir. Bulgular: Akromegali hastalarında GAS6 genine ait c.834+7G>A polimorfizminin görülme sıklığı, kontrol grubundan farklı değildi (p>0.05). Kontrol grubunda AA, AG ve GG genotiplerinin dağılımı sırasıyla %42, %48 ve %10 olarak saptanırken, akromegali grubunda %45.8, %43.7 ve %10 olarak belirlenmiştir. Serum GAS6 konsantrasyonları akr...
Climacteric, 2011
To determine the frequency of the vitamin D receptor (VDR) gene polymorphisms BsmI, ApaI, TaqI an... more To determine the frequency of the vitamin D receptor (VDR) gene polymorphisms BsmI, ApaI, TaqI and FokI and their associations with bone mineral density (BMD) in postmenopausal Turkish women. One hundred and thirty healthy postmenopausal women and 130 premenopausal healthy women acting as controls were included in the study. The BsmI, FokI, ApaI and TaqI polymorphisms in the VDR gene were studied by polymerase chain reaction-restriction fragment length polymorphism method. The BMD of the lumbar vertebrae and femur neck were measured by dual-energy X-ray absorptiometry. Comparisons between the groups were performed using the paired t-test and ANOVA. χ (2) or contingency tables were used to analyze qualitative results. Genotypes BB, Bb and bb occurred in premenopausal women with frequencies of 16.92%, 50% and 33.08% and in postmenopausal women with frequencies of 16.92%, 56.15% and 26.92%, respectively. Genotypes FF, Ff, ff occurred in premenopausal women with frequencies of 47.69%, 42.31% and 10% and in postmenopausal women with frequencies of 50.77%, 42.31% and 6.92%, respectively. Genotypes AA, Aa, aa occurred in premenopausal women with frequencies of 23.85%, 56.15% and 20% and in postmenopausal women with frequencies of 26.15%, 46.15% and 27.70%, respectively. Genotypes TT, Tt and tt occurred in premenopausal women with frequencies of 37.69%, 45.38% and 16.92% and in postmenopausal women with frequencies of 39.23%, 45% and 15.38%, respectively. There was no difference in the frequencies of VDR gene polymorphisms between premenopausal and postmenopausal women. BMD measurements were not different between genotypes in premenopausal and postmenopausal women. The VDR gene BsmI, FokI, ApaI and TaqI polymorphisms have no major influence on bone mineral density in our group of postmenopausal women.
Journal of photochemistry and photobiology. B, Biology, 2021
It is crucial to develop nanocarrier systems to detect and treat drug-resistant micro tumors to p... more It is crucial to develop nanocarrier systems to detect and treat drug-resistant micro tumors to prevent recurrence and/or metastasis of cancer. Due to their exceptional features such as biocompatibility, easy surface modification, serving as imaging and therapeutic agent, gold nanoparticles (AuNPs) draw attention as theranostic agents. It is beneficial to combine AuNPs with a second imaging and/or treatment modality such as photodynamic therapy (PDT). PDT is a non-mutagenic treatment approach in which photosensitizer is activated with light, generating reactive oxygen species and/or free radicals to destroy tumor cells. With the aim of developing "off-on" theranostic system, citrate stabilized spherical 13 nm AuNPs were densely coated with polyethylene glycol (PEG). To advance the theranostic feature of PEGylated AuNPs, they were further functionalized with FDA-Approved photosensitizer, Verteporfin (BPD-MA). Due to static quenching between BPD-MA and AuNPs as well as in be...
The Journal of Maternal-Fetal & Neonatal Medicine, 2015
Preeclampsia (PE) is a hypertensive disease of pregnancy complicating 2-8% of all pregnancies. Th... more Preeclampsia (PE) is a hypertensive disease of pregnancy complicating 2-8% of all pregnancies. The exact pathophysiology still remains unknown. Growth arrest-specific 6 (Gas6) is a member of the vitamin K-dependent protein family and it has been suggested as a novel atherothrombotic risk factor with anti-angiogenic and pro-atherogenic properties. The goal of the our study was to investigate the relationships between the c.834 + 7G > A polymorphism of GAS6, plasma Gas6 levels and PE. A total of 150 women, including 82 preeclamptic pregnant women and 68 normotensive pregnant (NP) women, were recruited in the current study. Blood samples were taken from all participitants. Plasma Gas6 levels measured by an enzyme-linked immunosorbent assay. GAS6 polymorphism was determined using a PCR-RFLP method. The plasma Gas6 levels of preeclamptic patients were significantly lower than those of NP women (8.65 ± 3.70 ng/ml and 10.89 ± 4.23 ng/ml respectively, p < 0.001). The GG genotype was the most prevalent, and the risk of PE was 3.5-fold higher in pregnant women with GG genotype compared to woman with AA genotype (p < 0.01). The A allele was less frequent in preeclamptic patients than in control subjects (OR = 2.118, 95% CI = 1.330-3.371, p < 0.001). Our results suggest that GAS6 c.834 + 7G > A polymorphism may have a pivotal role in the pathogenesis of PE suggesting that the A allele has a protective role for PE.
Objective: Preeclampsia (PE) is a hypertensive disease of pregnancy complicating 2-8% of all preg... more Objective: Preeclampsia (PE) is a hypertensive disease of pregnancy complicating 2-8% of all pregnancies. The exact pathophysiology still remains unknown. Growth arrest-specific 6 (Gas6) is a member of the vitamin K-dependent protein family and it has been suggested as a novel atherothrombotic risk factor with anti-angiogenic and pro-atherogenic properties. The goal of the our study was to investigate the relationships between the c.834 + 7G4A polymorphism of GAS6, plasma Gas6 levels and PE. Methods: A total of 150 women, including 82 preeclamptic pregnant women and 68 normotensive pregnant (NP) women, were recruited in the current study. Blood samples were taken from all participitants. Plasma Gas6 levels measured by an enzyme-linked immunosorbent assay. GAS6 polymorphism was determined using a PCR-RFLP method. Results: The plasma Gas6 levels of preeclamptic patients were significantly lower than those of NP women (8.65 ± 3.70 ng/ml and 10.89 ± 4.23 ng/ml respectively, p50.001). The GG genotype was the most prevalent, and the risk of PE was 3.5-fold higher in pregnant women with GG genotype compared to woman with AA genotype (p50.01). The A allele was less frequent in preeclamptic patients than in control subjects (OR ¼ 2.118, 95% CI ¼ 1.330-3.371, p50.001). Conclusions: Our results suggest that GAS6 c.834 + 7G4A polymorphism may have a pivotal role in the pathogenesis of PE suggesting that the A allele has a protective role for PE.
Thrombosis Research, 2014
Journal of Photochemistry and Photobiology B: Biology
European Journal of Pharmaceutics and Biopharmaceutics
Applied Biochemistry and Biotechnology, 2019
Dense brush conformation-bearing theranostic agents are emerging as drug delivery systems due to ... more Dense brush conformation-bearing theranostic agents are emerging as drug delivery systems due to their higher ability to escape from reticuloendothelial system uptake which prolongs their in vivo circulation time. With the aim of developing dual therapy agent, 13-nm gold nanoparticles' (AuNPs) surfaces were coated with different amounts of polyethylene glycol (PEG) (SH-PEG-NH 2) to obtain dense brush conformation-bearing theranostic agents. Among the 14 different theranostic agent candidates prepared, the one hosting 1819 PEG per particle was selected as the most promising theranostic agent candidate based on structural conformation, stability, size, zeta potential, hemocompatibility, cell inhibition, and cell death pathway towards MCF-7 cell line. To test drug delivery efficiency of the developed PEGylated AuNP and to improve efficacy of the treatment, apoptotic peptide (AP) was covalently conjugated to NH 2 terminus of the PEG in various ratios to yield AuNP-AP conjugate. Among the prepared conjugates, the one having 1 nmol of peptide per milliliter of AuNP yielded the most promising results based on the same criteria as employed for PEGylated AuNPs. Besides, incorporation of AP to AuNP returned in superior efficacy of AP since it was possible to achieve 50% cell death with 1000 times less amount of AP alone.
Climacteric, 2011
Objective To determine the frequency of the vitamin D receptor (VDR) gene polymorphisms BsmI, Apa... more Objective To determine the frequency of the vitamin D receptor (VDR) gene polymorphisms BsmI, ApaI, TaqI and FokI and their associations with bone mineral density (BMD) in postmenopausal Turkish women. Design One hundred and thirty healthy postmenopausal women and 130 premenopausal healthy women acting as controls were included in the study. The BsmI, FokI, ApaI and TaqI polymorphisms in the VDR gene were studied by polymerase chain reaction-restriction fragment length polymorphism method. The BMD of the lumbar vertebrae and femur neck were measured by dual-energy X-ray absorptiometry. Comparisons between the groups were performed using the paired t-test and ANOVA. w 2 or contingency tables were used to analyze qualitative results. Results Genotypes BB, Bb and bb occurred in premenopausal women with frequencies of 16.92%, 50% and 33.08% and in postmenopausal women with frequencies of 16.92%, 56.15% and 26.92%, respectively. Genotypes FF, Ff, ff occurred in premenopausal women with frequencies of 47.69%, 42.31% and 10% and in postmenopausal women with frequencies of 50.77%, 42.31% and 6.92%, respectively. Genotypes AA, Aa, aa occurred in premenopausal women with frequencies of 23.85%, 56.15% and 20% and in postmenopausal women with frequencies of 26.15%, 46.15% and 27.70%, respectively. Genotypes TT, Tt and tt occurred in premenopausal women with frequencies of 37.69%, 45.38% and 16.92% and in postmenopausal women with frequencies of 39.23%, 45% and 15.38%, respectively. There was no difference in the frequencies of VDR gene polymorphisms between premenopausal and postmenopausal women. BMD measurements were not different between genotypes in premenopausal and postmenopausal women. Conclusions The VDR gene BsmI, FokI, ApaI and TaqI polymorphisms have no major influence on bone mineral density in our group of postmenopausal women.
Amaç: Bu tezin amacı GAS6’nın akromegali ve komplikasyonlarıyla ilişkisi olup olmadığını inceleme... more Amaç: Bu tezin amacı GAS6’nın akromegali ve komplikasyonlarıyla ilişkisi olup olmadığını incelemektir. Bu amaca ulaşmak için GAS6 genine ait c.834+7G>A polimorfizmi ve serum GAS6 protein konsantrasyonu; insülin direnci, GH, IGF-1 ve hastalık süresi gibi çeşitli parametreler birlikte incelenmiştir. Gereç ve Yöntem: Marmara Üniversitesi Tıp Fakültesi Endokrinolji Bilim Dalına başvuran hastalardan, akromegali grubu (n=48) ve sağlıklı gönüllülerden kontrol grubu (n=50) oluşturulmuştur. GAS6 genine ait c.834+7G>A polimorfizmi, PZR-RLFP yöntemiyle çalışılmıştır. Serum GAS6 konsantrasyonu ELISA (CUSABIO Human GAS6 ELISA Kit) yöntemiyle belirlenmiştir. Bulgular: Akromegali hastalarında GAS6 genine ait c.834+7G>A polimorfizminin görülme sıklığı, kontrol grubundan farklı değildi (p>0.05). Kontrol grubunda AA, AG ve GG genotiplerinin dağılımı sırasıyla %42, %48 ve %10 olarak saptanırken, akromegali grubunda %45.8, %43.7 ve %10 olarak belirlenmiştir. Serum GAS6 konsantrasyonları akr...
Climacteric, 2011
To determine the frequency of the vitamin D receptor (VDR) gene polymorphisms BsmI, ApaI, TaqI an... more To determine the frequency of the vitamin D receptor (VDR) gene polymorphisms BsmI, ApaI, TaqI and FokI and their associations with bone mineral density (BMD) in postmenopausal Turkish women. One hundred and thirty healthy postmenopausal women and 130 premenopausal healthy women acting as controls were included in the study. The BsmI, FokI, ApaI and TaqI polymorphisms in the VDR gene were studied by polymerase chain reaction-restriction fragment length polymorphism method. The BMD of the lumbar vertebrae and femur neck were measured by dual-energy X-ray absorptiometry. Comparisons between the groups were performed using the paired t-test and ANOVA. χ (2) or contingency tables were used to analyze qualitative results. Genotypes BB, Bb and bb occurred in premenopausal women with frequencies of 16.92%, 50% and 33.08% and in postmenopausal women with frequencies of 16.92%, 56.15% and 26.92%, respectively. Genotypes FF, Ff, ff occurred in premenopausal women with frequencies of 47.69%, 42.31% and 10% and in postmenopausal women with frequencies of 50.77%, 42.31% and 6.92%, respectively. Genotypes AA, Aa, aa occurred in premenopausal women with frequencies of 23.85%, 56.15% and 20% and in postmenopausal women with frequencies of 26.15%, 46.15% and 27.70%, respectively. Genotypes TT, Tt and tt occurred in premenopausal women with frequencies of 37.69%, 45.38% and 16.92% and in postmenopausal women with frequencies of 39.23%, 45% and 15.38%, respectively. There was no difference in the frequencies of VDR gene polymorphisms between premenopausal and postmenopausal women. BMD measurements were not different between genotypes in premenopausal and postmenopausal women. The VDR gene BsmI, FokI, ApaI and TaqI polymorphisms have no major influence on bone mineral density in our group of postmenopausal women.
Journal of photochemistry and photobiology. B, Biology, 2021
It is crucial to develop nanocarrier systems to detect and treat drug-resistant micro tumors to p... more It is crucial to develop nanocarrier systems to detect and treat drug-resistant micro tumors to prevent recurrence and/or metastasis of cancer. Due to their exceptional features such as biocompatibility, easy surface modification, serving as imaging and therapeutic agent, gold nanoparticles (AuNPs) draw attention as theranostic agents. It is beneficial to combine AuNPs with a second imaging and/or treatment modality such as photodynamic therapy (PDT). PDT is a non-mutagenic treatment approach in which photosensitizer is activated with light, generating reactive oxygen species and/or free radicals to destroy tumor cells. With the aim of developing "off-on" theranostic system, citrate stabilized spherical 13 nm AuNPs were densely coated with polyethylene glycol (PEG). To advance the theranostic feature of PEGylated AuNPs, they were further functionalized with FDA-Approved photosensitizer, Verteporfin (BPD-MA). Due to static quenching between BPD-MA and AuNPs as well as in be...
The Journal of Maternal-Fetal & Neonatal Medicine, 2015
Preeclampsia (PE) is a hypertensive disease of pregnancy complicating 2-8% of all pregnancies. Th... more Preeclampsia (PE) is a hypertensive disease of pregnancy complicating 2-8% of all pregnancies. The exact pathophysiology still remains unknown. Growth arrest-specific 6 (Gas6) is a member of the vitamin K-dependent protein family and it has been suggested as a novel atherothrombotic risk factor with anti-angiogenic and pro-atherogenic properties. The goal of the our study was to investigate the relationships between the c.834 + 7G > A polymorphism of GAS6, plasma Gas6 levels and PE. A total of 150 women, including 82 preeclamptic pregnant women and 68 normotensive pregnant (NP) women, were recruited in the current study. Blood samples were taken from all participitants. Plasma Gas6 levels measured by an enzyme-linked immunosorbent assay. GAS6 polymorphism was determined using a PCR-RFLP method. The plasma Gas6 levels of preeclamptic patients were significantly lower than those of NP women (8.65 ± 3.70 ng/ml and 10.89 ± 4.23 ng/ml respectively, p < 0.001). The GG genotype was the most prevalent, and the risk of PE was 3.5-fold higher in pregnant women with GG genotype compared to woman with AA genotype (p < 0.01). The A allele was less frequent in preeclamptic patients than in control subjects (OR = 2.118, 95% CI = 1.330-3.371, p < 0.001). Our results suggest that GAS6 c.834 + 7G > A polymorphism may have a pivotal role in the pathogenesis of PE suggesting that the A allele has a protective role for PE.
Objective: Preeclampsia (PE) is a hypertensive disease of pregnancy complicating 2-8% of all preg... more Objective: Preeclampsia (PE) is a hypertensive disease of pregnancy complicating 2-8% of all pregnancies. The exact pathophysiology still remains unknown. Growth arrest-specific 6 (Gas6) is a member of the vitamin K-dependent protein family and it has been suggested as a novel atherothrombotic risk factor with anti-angiogenic and pro-atherogenic properties. The goal of the our study was to investigate the relationships between the c.834 + 7G4A polymorphism of GAS6, plasma Gas6 levels and PE. Methods: A total of 150 women, including 82 preeclamptic pregnant women and 68 normotensive pregnant (NP) women, were recruited in the current study. Blood samples were taken from all participitants. Plasma Gas6 levels measured by an enzyme-linked immunosorbent assay. GAS6 polymorphism was determined using a PCR-RFLP method. Results: The plasma Gas6 levels of preeclamptic patients were significantly lower than those of NP women (8.65 ± 3.70 ng/ml and 10.89 ± 4.23 ng/ml respectively, p50.001). The GG genotype was the most prevalent, and the risk of PE was 3.5-fold higher in pregnant women with GG genotype compared to woman with AA genotype (p50.01). The A allele was less frequent in preeclamptic patients than in control subjects (OR ¼ 2.118, 95% CI ¼ 1.330-3.371, p50.001). Conclusions: Our results suggest that GAS6 c.834 + 7G4A polymorphism may have a pivotal role in the pathogenesis of PE suggesting that the A allele has a protective role for PE.