[Resistance exercise regulates hippocampal microglia polarization through TREM2/NF-κB/STAT3 signal pathway to improve cognitive dysfunction in T2DM mice].

The study aimed to explore the effect and mechanism of resistance exercise (RE) on cognitive dysfunction in type 2 diabetes mellitus (T2DM) mice. Six 8-week-old male m/m mice were used as control (Con) group, and db/db mice of the matched age were randomly divided into model control (db/db) group and db+RE group, with 6 mice in each group. The db+RE group was given 8 weeks of resistance climbing ladder exercise intervention.

A bivalent cationic dye enabling selective photo-inactivation against Gram-negative bacteria.

A piperazine-modified Crystal Violet was found to be able to selectively inactivate Gram-negative bacteria upon visible light irradiation but left Gram-positive bacteria less damaged, which can serve as a blueprint for the development of novel narrow-spectrum agents to replenish the current arsenal of photodynamic antimicrobial chemotherapy (PACT).

BODIPY-modified Ru(II) arene complex--a new ligand dissociation mechanism and a novel strategy to red shift the photoactivation wavelength of anticancer metallodrugs.

A Ru(II) arene complex [(η(6)-p-cymene)Ru(bpy)(py-BODIPY)](PF(6))(2), where bpy is 2,2'-bipyridine and py-BODIPY is a 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene dye containing a pyridine group at the 8-position, was designed and synthesized. BODIPY modification renders the monodentate pyridine ligand with long wavelength absorbing capability, and an absorption maximum at 504 nm. Upon selective irradiation of the absorption band of the py-BODIPY ligand, the dissociation of the monodentate ligand occurs efficiently, followed by substitution by 9-ethylguanine if it is present in the solution.

Oxovanadium(IV) based hypocrellin B complexes with enhanced photodynamic activity.

Hypocrellin B (HB), a naturally occurring photosensitizer, has been extensively and intensively studied as a promising photodynamic therapy (PDT) agent. In this work, three new oxovanadium(IV) complexes were designed and synthesized with HB as a bridging ligand and phen (1,10-phenanthroline, complex 1), tmp (3,4,7,8-tetramethyl-1,10-phenanthroline, complex 2) and dpq (dipyrido[3,2-f:2'3'-h]quinoxaline, complex 3) as terminal ligands. The use of a diimine terminal ligand avoids the formation of polymeric complexes and ensures the three VO(2+)-HB complexes possess a definite molecular formula and molecular weight to meet the single component requirement for an ideal PDT agent.

A new Co(III)-hypocrellin B complex with enhanced photonuclease activity.

Hypocrellin B (HB), a naturally occurring photosensitizer, has been extensively and intensively studied as a promising photodynamic therapy (PDT) agent. In this work, a new Co(III) complex [Co(2)(HB)(tmp)(4)](4+) (tmp=3,4,7,8-tetramethyl-1,10-phenanthroline) was designed and synthesized with HB as bridging ligand and tmp as terminal ligand. [Co(2)HB(tmp)(4)](4+) exhibits improved water solubility, enhanced absorptivity in the phototherapeutic window, increased binding affinity and DNA photocleavage capability toward dsDNA with respect to HB.

Dinuclear Cu(II) hypocrellin B complexes with enhanced photonuclease activity.

Five new dinuclear Cu(II) complexes were designed and synthesized, using hypocrellin B, a naturally occurring photosensitizer that has received extensive studies as promising photodynamic therapy (PDT) agent, as bridging ligand, and five kinds of diimine ligands, including 2,2'-bipyridine (bpy), 1,10-phenanthroline (phen), 3,4,7,8-tetramethyl-1,10-phenanthroline (tmp), dipyrido[3,2-d:2',3'-f]quinoxaline (dpq), and dipyrido[3,2-a:2',3'-c]phenazene (dppz), as terminal ligands, respectively. The Cu(2+)-HB complexes exhibit improved water solubility, enhanced absorptivity in the phototherapeutic window of 600-900 nm, and increased binding affinity toward dsDNA than their parent HB. The biologically accessible redox potential of Cu(II)/Cu(I) couple renders the five Cu(2+)-HB complexes chemical nuclease activities in the presence of reducing agent such as ascorbic acid.

A new Phenol Red-modified porphyrin as efficient protein photocleaving agent.

Protein affinity is of importance for porphyrins in their application in photodynamic therapy (PDT). A new Phenol Red-modified porphyrin (R-TPP) was designed and synthesized to fully take advantage of the binding character of Phenol Red towards protein. Detailed comparisons of absorption spectra, fluorescence spectra, n-octanol/water partition coefficients, (1)O(2) quantum yields, as well as protein photocleaving abilities between R-TPP and its parent porphyrin Br-TPP clearly demonstrate the benefits stemming from the modification of Phenol Red.

[Ru(bpy)(3-n)(dpb)(n)](2+): unusual photophysical property and efficient DNA photocleavage activity.

The sequential replacement of a bpy ligand (bpy = 2,2'-bipyridine) by a dpb ligand (dpb = 2,3-bis(2-pyridyl) benzoquinoxaline) in the series [Ru(bpy)(3-n)(dpb)(n)](2+) (n = 1-3) leads to a remarkable increase of the excited state lifetime, the (1)O(2) quantum yield, and the binding affinity toward dsDNA, rendering both [Ru(bpy)(dpb)(2)](2+) and [Ru(dpb)(3)](2+) efficient DNA photocleavage activities upon red light irradiation (>or=600 nm).

A new heteroleptic ruthenium(II) polypyridyl complex with long-wavelength absorption and high singlet-oxygen quantum yield.

Ruthenium(II) polypyridyl complexes with long-wavelength absorption and high singlet-oxygen quantum yield exhibit attractive potential in photodynamic therapy. A new heteroleptic Ru(II) polypyridyl complex, [Ru(bpy)(dpb)(dppn)](2+) (bpy=2,2'-bipyridine, dpb=2,3-bis(2-pyridyl)benzoquinoxaline, dppn=4,5,9,16-tetraaza-dibenzo[a,c]naphthacene), is reported, which exhibits a (1)MLCT (MLCT: metal-to-ligand charge transfer) maximum as long as 548 nm and a singlet-oxygen quantum yield as high as 0.43.

DNA photocleavage activity of cobalt(III) polypyridyl complexes containing dpq ligand.

Four cobalt(III) polypyridyl complexes, [Co(phen)(3-)(n)(dpq)(n)](3+) (phen=1,10-phenanthroline, dpq=dipyrido[3,2-f:2',3'-h]-quinoxaline) (n=0, 1, 2, and 3) were synthesized and the influences of the dpq ligand on the photophysical properties, electrochemical properties, DNA binding affinities, as well as photonuclease activities of the complexes, were examined in detail. The presence of dpq ligand increases the DNA binding affinities of the corresponding complexes remarkably with respect to [Co(phen)(3)](3+). With the sequential substitution of phen ligand by dpq ligand, the (1)O(2) quantum yields of the corresponding complexes are enhanced greatly.

Ruthenium(II) terpyridyl complexes exhibiting DNA photocleavage: the role of the substituent on monodentate ligand.

Five ruthenium(II) complexes, [Ru(II)(tpy)(dppz)(py-R)](2+) (tpy = 2,2':6',2''-terpyridine; dppz = dipyrido[3,2-a:2',3'-c]phenazine; py-R = 4-substituted pyridine; R = N(CH(3))(2), NH(2), OCH(3), H, NO(2)), were synthesized; and the substituent effects on the photophysical property, electrochemical property, DNA binding, and DNA photocleavage of the complexes were examined carefully. Increasing the electron-donating ability of the substituent R from NO(2) to N(CH(3))(2) leads to a cathodic shift of Ru-based oxidation potential, a red shift of the (1)MLCT absorption at room temperature and the (3)MLCT emission at 77 K, and enhancement of the DNA photocleavage ability. DNA photocleavage control experiments and the EPR spin-trapping technique confirm that the photocleavage abilities of the complexes originate from (1)O(2) production.

[Study on interaction between hypocrellin A and hemoglobin or myoglobin using synchronous fluorescence spectra].

The effects of hypocrellin A (HA) on the conformational changes of hemoglobin and myoglobin were studied using synchronous fluorescence spectroscopy. The results indicated that HA can change the conformation of these two proteins, leading to the change in the micro-environment of tryptophane and tyrosine residues from hydrophobic environment to hydrophilic environment to different extent.

A tyrosine-modified hypocrellin B with affinity for and photodamaging ability towards calf thymus DNA.

An enhanced photodamaging ability towards CT-DNA was achieved in a tyrosine-modified hypocrellin B by improving the affinity of the sensitizer to DNA.

The photodynamic property improvement of hypocrellin A by chelation with lanthanum ions.

A 1:1 complex of lanthanum ion with hypocrellin A (La3+-HA) possessing high singlet oxygen generation efficiency, large absorbance in the phototherapeutic window, and great water solubility exhibits promising photodynamic properties.

Dual emission from 3MLCT and 3ILCT excited states in a new Ru(II) diimine complex.

The unique behavior of a new Ru(II) diimine complex, Ru(bpy)(2)(L)(2+) (where L is 4-methyl-4'-[p-(dimethyl- amino)-alpha-styryl]-2,2'-bipyridine, bpy is 2,2'-bipyridine), was studied in detail. Due to the strong electron donating property of the amino group, an ILCT (intraligand charge transfer) state is involved either in the absorption spectra or in the time-resolved emission spectra. Dual emission based on (3)MLCT and (3)ILCT states was observed at room temperature for the first time via a time-resolved technique in Ru(II) diimine complexes.