Potentilla anserina polysaccharide alleviates cadmium-induced oxidative stress and apoptosis of H9c2 cells by regulating the MG53-mediated RISK pathway.

Oxidative stress plays a crucial role in cadmium (Cd)-induced myocardial injury. Mitsugumin 53 (MG53) and its mediated reperfusion injury salvage kinase (RISK) pathway have been demonstrated to be closely related to myocardial oxidative damage. Potentilla anserina L. polysaccharide (PAP) is a polysaccharide with antioxidant capacity, which exerts protective effect on Cd-induced damage. However, it remains unknown whether PAP can prevent and treat Cd-induced cardiomyocyte damages. The present study was desgined to explore the effect of PAP on Cd-induced damage in H9c2 cells based on MG53 and the mediated RISK pathway. For in vitro evaluation, cell viability and apoptosis rate were analyzed by CCK-8 assay and flow cytometry, respectively. Furthermore, oxidative stress was assessed by 2',7'-dichlorodihydrofluorescein diacetate (DCFH-DA) staining and using superoxide dismutase (SOD), catalase (CAT), and glutathione/oxidized glutathione (GSH/GSSG) kits. The mitochondrial function was measured by JC-10 staining and ATP detection assay. Western blot was performed to detect the expression of proteins related to MG53, the RISK pathway, and apoptosis. The results indicated that Cd increased the levels of reactive oxygen species (ROS) in H9c2 cells. Cd decreased the activities of SOD and CAT and the ratio of GSH/GSSG, resulting in decreases in cell viability and increases in apoptosis. Interestingly, PAP reversed Cd-induced oxidative stress and cell apoptosis. Meanwhile, Cd reduced the expression of MG53 in H9c2 cells and inhibited the RISK pathway, which was mediated by decreasing the ratio of p-AktSer473/Akt, p-GSK3ßSer9/GSK3ß and p-ERK1/2/ERK1/2. In addition, Cd impaired mitochondrial function, which involved a reduction in ATP content and mitochondrial membrane potential (MMP), and an increase in the ratio of Bax/Bcl-2, cytoplasmic cytochrome c/mitochondrial cytochrome c, and Cleaved-Caspase 3/Pro-Caspase 3. Importantly, PAP alleviated Cd-induced MG53 reduction, activated the RISK pathway, and reduced mitochondrial damage. Interestingly, knockdown of MG53 or inhibition of the RISK pathway attenuated the protective effect of PAP in Cd-induced H9c2 cells. In sum, PAP reduces Cd-induced damage in H9c2 cells, which is mediated by increasing MG53 expression and activating the RISK pathway.

Potentilla anserine L. polysaccharide protects against cadmium-induced neurotoxicity.

Cadmium is a toxic metal that can damage the brain and other organs. This study aimed to explore the protective effects of Potentilla anserine L. polysaccharide (PAP) against CdCl2-induced neurotoxicity in N2a and SH-SY5Y cells and in the cerebral cortex of BALB/c mice. In addition, we aimed to identify the potential mechanisms underlying these protective effects. Relative to CdCl2 treatment alone, pretreatment with PAP prevented the reduction in cell viability evoked by CdCl2, decreased rates of apoptosis, promoted calcium homeostasis, decreased ROS accumulation, increased mitochondrial membrane potential, inhibited cytochrome C and AIF release, and prevented the cleavage of caspase-3 and PARP. In addition, PAP significantly decreased the CdCl2-induced phosphorylation of CaMKII, Akt, and mTOR. In conclusion, PAP represents a potential therapeutic agent for the treatment of Cd-induced neurotoxicity, functioning in part via attenuating the activation of the mitochondrial apoptosis pathway and the Ca2+-CaMKII-dependent Akt/mTOR pathway.

Potentilla anserine L. polysaccharide inhibits cadmium-induced neurotoxicity by attenuating autophagy.

Cadmium (Cd), a heavy metal with cytotoxicity, can activate autophagy. This study aimed to explore the effects and mechanisms of Potentilla anserine L. polysaccharide (PAP) on autophagy in N2a cells, primary neurons, and the brain of BALB/c mice exposed to Cd. The CCK-8 assay results showed that the cell viability decreased and the number of acidic vesicular organelles, autophagic vacuoles, lysosomes, and dysfunctional mitochondria increased in the cytoplasm of Cd-exposed N2a cells and primary neurons, as revealed by acridine orange staining, monodansylcadaverine staining, and transmission electron microscopy. PAP mitigated Cd-induced neuronal death and characteristic changes in autophagy. The expression of LC3 IILC3 II, Bcl-2, p62, Beclin-1, and PI3K class III was examined by Western blot analysis. Furthermore, the PI3K inhibitor (LY294002 or 3-MA) and/or PAP reversed the Cd-induced upregulated expression of LC3 II, Beclin-1, and PI3K class III, with a synergy between PI3K inhibitor and PAP against Cd-induced autophagy. The findings suggested that PAP partially prevented Cd-induced autophagic cell death in neurons by inhibiting the PI3K class III/Beclin-1 signaling pathway in vitro and in vivo.

Protective effect of Potentilla anserina polysaccharide on cadmium-induced nephrotoxicity in vitro and in vivo.

The aim of this research was to investigate the antioxidant and anti-apoptotic activities of Potentilla anserina polysaccharide (PAP) on kidney damage induced by cadmium (Cd) in vitro and in vivo. PAP has been suggested to have anti-oxidation, anti-apoptosis, immunoregulation, antimicrobial, antitussive, and expectorant abilities. In this study, PAP was extracted and the major components of PAP were analyzed. It was shown that PAP pretreatment remarkably improved redox homeostasis, both in human embryonic kidney 293 (HEK293) cells and in BALB/c mice. Administration of PAP attenuated the mitochondrial dysfunction, degeneration, and fibrosis of kidney induced by Cd. Furthermore, PAP exhibited anti-apoptotic activity, which involved regulating both the mitochondria-mediated intrinsic apoptotic pathway and the death receptor-initiated extrinsic pathway. These results suggest that PAP is a potential therapeutic agent for Cd-induced nephrotoxicity.

A coumarin-based two-photon probe for hydrogen peroxide.

A new fluorescence probe was developed for hydrogen peroxide (H2O2) detection based on donor-excited photo induced electron transfer (D-PET) mechanism, together with the benzil as a quenching and recognizing moiety. The benzil could convert to benzoic anhydride via a Baeyer-Villiger type reaction in the presence of H2O2, followed by hydrolysis of benzoicanhydride to give benzoic acid, and the fluorophore released. The probe was synthesized by a 6-step procedure starting from 4-(diethylamino)salicylaldehyde. A density functional theory (DFT) calculation was performed to demonstrate that the benzil was a fluorescence quencher. The probe was evaluated in both one-photon and two-photon mode, and it exhibited high selectivity toward H2O2 over other reactive oxygen species and high sensitivity with a detection limit of 0.09 µM. Furthermore, the probe was successfully applied to cell imaging of intracellular H2O2 levels with one-photon microscopy and two-photon microscopy. The superior properties of the probe made it of great potential use in more chemical and biological researches.

Rational design of small indolic squaraine dyes with large two-photon absorption cross section.

Small organic dyes with large two-photon absorption (TPA) cross sections (δ) are more desirable in many applications compared with large molecules. Herein, we proposed a facile theoretical method for the fast screening of small organic molecules as potential TPA dyes. This method is based on a theoretical analysis to the natural transition orbitals (NTOs) directly associated with the TPA transition. Experimental results on the small indolic squaraine dyes (ISD) confirmed that their TPA cross sections is strongly correlated to the delocalization degree of the NTOs of the S2 excited states. Aided by this simple and intuitive method, we have successfully designed and synthesized a small indolic squaraine dye (ISD) with a remarkable δ value above 8000 GM at 780 nm. The ISD dye also exhibits a high singlet oxygen generation quantum yield about 0.90. The rationally designed TPA dye was successfully applied in both two-photon excited fluorescence cell imaging and in vivo cerebrovascular blood fluid tracing.

An electrochemically switched smart surface for peptide immobilization and conformation control.

We report an electrochemically switched smart surface for controlled peptide immobilization and conformation control. This dynamic surface is based on self-assembled monolayers (SAMs) containing surface-bound trimethoxybenzene moieties, which can undergo electrochemically modulated surface activation to be stepwisely converted to two catechol derivatives. This new smart surface can be used to realize stepwise immobilization of a peptide, and more importantly, to control peptide conformation on a surface. We demonstrate herein that with one electrochemical activation step, a linear peptide containing an RGD sequence can be attached onto the SAMs. With the subsequence activation step, the attached linear RGD peptide can be converted into cyclic conformation. The SAMs bounded with linear and cyclic RGD exhibit different adhesion behaviors to fibroblasts cells. The reaction procedure can be well-monitored by cyclic voltammetry (CV), electrochemical surface enhanced Raman microscopy (EC-SERS), and X-ray photoelectron spectroscopy (XPS). It is believed this robust smart surface can find wide applications in surface immobilization of bioactive moieties.

Gelatin functionalized graphene oxide for mineralization of hydroxyapatite: biomimetic and in vitro evaluation.

We report a facile modification of graphene oxide (GO) by gelatin to mimic charged proteins present in the extracellular matrix during bone formation. The bioinspired surface of GO-gelatin (GO-Gel) composite was used for biomimetic mineralization of hydroxyapatite (HA). A detailed structural and morphological characterization of the mineralized composite was performed. Additionally, MC3T3-E1 cells were cultured on the GO-Gel surfaces to observe various cellular activities and HA mineralization. Higher cellular activities such as cell adhesion, cell proliferation, and alkaline phosphatase activity (ALP) were observed on the GO-Gel surface compared with the GO or glass surface. The increase of ALP confirms that the proposed GO-Gel promotes the osteogenic differentiation of MC3T3-E1 cells. Moreover, the evidence of mineralization evaluated by scanning electron microscopy (SEM) and alizarin red staining (ARS) corroborate the idea that a native osteoid matrix is ultimately deposited. All these data suggest that the GO-Gel hybrids will have great potential as osteogenesis promoting scaffolds for successful application in bone surgery.

A coumarin-derived fluorescent chemosensor for selectively detecting Cu²âº: synthesis, DFT calculations and cell imaging applications.

A novel coumarin-based fluorescent probe L ((4E)-4-((7-hydroxy-4-methyl-2-oxo-2H-chromen-8-yl) methyleneamino)-1,2-dihyydro-2,3-dimethyl-1-phenylpyrazol-5-one) has been developed as a simple and efficient chemosensor which exhibits a significant fluorescence reduction in the presence of metal cations. This sensor exhibits high selectivity and sensitivity toward Cu(2+) over other common cations. The mechanism for detecting copper was evaluated by time-dependent density functional theory (TD-DFT) calculations and the coordination mode was also confirmed by density functional theory (DFT) calculations. Furthermore, results of cell imaging in this study indicate that this new probe may be useful for detection and monitoring of Cu(2+) in biological applications.

Biomimetic and cell-mediated mineralization of hydroxyapatite by carrageenan functionalized graphene oxide.

In bone tissue engineering, it is imperative to design multifunctional biomaterials that can induce and assemble bonelike apatite that is close to natural bone. In this study, graphene oxide (GO) was functionalized by carrageenan. The resulting GO-carrageenan (GO-Car) composite was further used as a substrate for biomimetic and cell-mediated mineralization of hydroxyapatite (HA). It was confirmed that carrageenan on the GO surface facilitated the nucleation of HA. The observation of the effect of the GO-Car on the adhesion, morphology, and proliferation of MC3T3-E1 cells was investigated. In vitro studies clearly show the effectiveness of GO-Car in promoting HA mineralization and cell differentiation. The results of this study suggested that the GO-Car hybrid will be a promising material for bone regeneration and implantation.

A highly selective fluorescence "turn-on" probe for Cu(II) based on reaction and its imaging in living cells.

A new oxidative C-O bond cleavage reaction-based probe FluHMPP was designed and prepared. FluHMPP displays excellent selective turn-on fluorescence response for Cu(II) in aqueous solution under visible light excitation. The cleavage products are fully characterized. Fluorescein fragment is further oxidized to highly fluorescent MFME (3'-O-methylfluorescein methyl ester), and benzyl ether of imine fragment has been transformed to carboxyl. Confocal microscopy experiments have demonstrated that FluHMPP could also be used in live cells for the detection of Cu(II).

[Effects of non-saccharomyces albicans metabolic products on the proliferation of human umbilical vein endothelial cell ECV304].

OBJECTIVE: To evaluate the effects of non-Saccharomyces albicans metabolic products on the cell cycle distribution and proliferation of human umbilical vein endothelial cell ECV304 cells in vitro. METHODS: The parallel dilution supernatant of Saccharomyces tropicalis, Saccharomyces krusei and Saccharomyces glabrata were prepared, and 1, 4, 16-fold(s) diluted concentration and control group were set up. The line of human umbilical vein endothelial cell ECV304 was cultured in vitro and treated by non-Saccharomyces albicans supernatant. The proliferous effect of ECV304 induced by non-Saccharomyces albicans supernatant after 24, 48, 72 h was detected by the methods of MTT, and the changes of cell density and cycle after 48 h were investigated by inverted microscope and flow cytometry. RESULTS: At the 24th hour, all of the higher concentration (1-fold) of non-Saccharomyces albicans supernatant and the 4-folds diluted Saccharomyces krusei could promote ECV304 proliferation(P < 0.05). After adding various non-Saccharomyces albicans supernatant at 48h and 72th hour, Saccharomyces krusei supernatant and Saccharomyces glabrata supernatant significantly increased proliferation rate of ECV304, while Saccharomyces tropicalis supernatant group showed no significant change no matter which concentration was tested. At 48th hour after adding the non-Saccharomyces albicans supernatant, the ECV304 cells density treated by Saccharomyces krusei supernatant and Saccharomyces glabrata supernatant were significantly higher under the inverted microscope. The G0/G1 population of ECV304 cells decreased while cell proliferation index (PI) increased after incubated with Saccharomyces krusei supernatant and Saccharomyces glabrata supernatant for 48 hours (P < 0.05). Saccharomyces tropicalis group showed no significant change (P > 0.05). CONCLUSION: The metabolic products of Sacharoymces krusei and Saccharomyces glabrata could induce proliferation of ECV304 cell, which suggests non-Saccharomyces albicans should be undergone more attention clinically in detection and treatment.

[A1381T and -1793G/C polymorphisms of vWF gene impact the plasma vWF levels in Yugur, Tibetan and Han nationalities of China].

The aim of this study was to investigate the similarities and differences of A1381T (rs216311) and -1793G/C (rs7966230) single nucleotide polymorphisms (SNP) in Chinese Yugur, Tibetan, and Han nationalities and their influence on plasma vWF concentration in order to explore the sensitivity of these 3 nationalities to vWF-related diseases. Peripheral venous blood was obtained from 322 Yugur, 399 Tibetan, and 120 Han healthy people. The DNA were then extracted. vWF gene A1381T and -1793G/C polymorphisms were analyzed by the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and sequenced when it was necessary. The vWF:Ag level in plasma was determined by ELISA. The results showed that the genotype distribution of vWF gene at both A1381T and -1793G/C loci in Yugur, Tibetan and Han nationalities was different with statistically significance (P < 0.05). GG genotype of A1381T locus accounted for 69.9% in Yugur nationality, which was much higher than 56.6% and 53.3% in Tibetan and Han nationalities respectively(P < 0.01); AA genotype of A1381T locus expressed a low level of vWF in plasma. For the -1793G/C locus, the proportion of CG genotype in Yugur was much higher than that in Han, CC genotype expressed a high level of vWF in plasma. The plasma vWF levels with different nationalities and the polymorphism of vWF gene were significantly different. It is concluded that the polymorphisms of vWF gene at both A1381T and -1793G/C loci in Yugur, Tibetan and Han are significantly different; the polymorphism of vWF gene influences the plasma vWF level; the plasma vWF levels in Yugur and Tibetan are significantly higher than that in Han, which may be associated with the living environment and habits.

[Effects of ICAM-1 gene K469E, K56M polymorphisms on plasma sICAM-1 expression levels in Chinese Yugur, Tibetan and Han nationalities].

This study was purposed to investigate the intercellular cell adhesion molecule-1 (ICAM-1) gene K469E (A/G) (rs5498) and K56M (A/T) (rs5491) single nucleotide polymorphisms (SNP) and soluble ICAM-1 (sICAM-1) levels in plasma in three Chinese populations of Yugur, Tibetan and Han nationalities, to analyze comparatively the genotypes and allele frequencies distribution in different ethnic groups, and to explore the effects of ICAM-1 K469E and K56M polymorphism and sICAM-1 levels in plasma. EDTA-anticoagulant venous blood from Yugur(327 cases), Tibetan (400 cases) and Han (126 cases) people was collected, the DNA was extracted by using whole blood genomic DNA extraction kit, DNA SNP were analyzed by PCR-RFLP, genotype was judged by gel scan imaging system after agarose gel electrophoresis, the gene sequence was determined and the distribution of ICAM-1 genotypes and allele frequencies were compared among different ethnic groups, besides, the group representativeness was tested via the Hardy-Weinberg genetic equilibrium. Finally, the human sICAM-1 plasma levels were detected by using human ICAM-1 ELISA kit. The results showed that DNA sequencing result was consistent with PCR-RFLP analysis. In Yugur, Tibetan and Han nationalities, the KK, KE and EE three genotypes at ICAM-1 K469E gene locus were detected, the genotype distribution was not statistically significantly different, while the K, E allele frequency distribution was statistically significantly different (P < 0.05). Both of genotype and allele frequency distribution between Yugur, Tibetan and Han nationalities were statistically significantly different (P < 0.05). In K56M site only KK, KM two genotypes were detected, but the MM genotype was not detected in the three ethnic groups; the difference of two genotypes and K, M allele frequencies between Yugur and Han population was statistically significantly different (P < 0.05). Among three ethnic groups, the sex ratio and age distribution of K469E, K56M genotypes and allele frequencies of ICAM-1 gene were not significantly different, and distribution was in accordance with Hardy-Weinberg genetic equilibrium (P > 0.05). The plasma sICAM-1 level at ICAM-1 K469E allele locus in K individuals [(253 ± 122), (185 ± 97) µg/L] was higher than that at non-K allele [(145 ± 110) µg/L, P < 0.01]; the plasma sICAM-1 level of ICAM-1 K56M sites with KK genotype [(253 ± 122) µg/L] was higher than that of the KM genotypes [(168 ± 103) µg/L, P < 0.01]. In Yugur and Tibetan groups, the plasma sICAM-1 levels [(224 ± 80), (214 ± 111) µg/L] were higher than that in the Han group [(175 ± 125)µg/L, P < 0.05]. Pairwise comparison indicated that the plasma sICAM-1 levels between Yugur and Han group were statistically significantly different (P < 0.01), that was significantly different between Tibetan and Han group (P < 0.05). It is concluded that in Yugur, Tibetan and Han population, the genotypes and gene frequencies of two amino acid sites K469E and K56M in ICAM-1 were KK/KE-type, KK-type and K allele, moreover, the ratio of them in Yugur and Tibetan group was higher than that in Han, while there is not significant difference in sex ratio and age distribution, therefore, ICAM-1 genotype and allele frequency distribution in this study had ethnic representativeness. ICAM-1 gene K469E and K56M polymorphisms were likely to affect the plasma sICAM-1 expression level. K469E gene K allele may be a genetic risk factor, while K56M gene M allele a may be genetic protective factor for some diseases.

Selective off-on fluorescent chemosensor for detection of Fe3+ ions in aqueous media.

A Fe(3+) chemosensor L1 was successfully synthesized with a quinoline moiety bound to rhodamine 6G hydrazide. The sensor L1 shows high selectivity and sensitivity to Fe(3+) in aqueous solution in the presence of other trace metal ions in organisms, abundant cellular cations and prevalent toxic metal ions in the environment. In addition, biological imaging and micro computed tomography (MCT) technology studies have demonstrated that L1 could act as a turn-on fluorescent chemosensor for Fe(3+) in living cells.

An 1,3,4-oxadiazole-based OFF-ON fluorescent chemosensor for Zn2+ in aqueous solution and imaging application in living cells.

A new 1,3,4-oxadiazole-based fluorescence chemosensor 1, N-(2-ethoxy-2-oxoethyl)-N-(5-(2-hydroxy-3,5-di-tert-butylphenyl)-[1,3,4]oxadiazol-2-yl)glycine ethyl ester, has been designed and synthesized. Its fluorescence properties and selectivity for various metal ions were investigated in detail. A prominent fluorescence enhancement only for Zn(2+) was found in aqueous acetonitrile solution and the response mechanism of 1 was analyzed by time-resolved fluorescence decay and DFT calculations. Furthermore, the fluorescence imaging of Zn(2+) in living cells was successfully applied.

A sensitive colorimetric and ratiometric fluorescent probe for mercury species in aqueous solution and living cells.

A highly sensitive and selective fluorescent probe for inorganic and organic mercury species displays colorimetric and ratiometric response in a buffer solution via mercury promoted cleavage reaction. The probe is demonstrated to detect CH(3)HgCl in living cells.

[Relationship between V617F mutation and 46/1 haplotype in JAK2 gene in patients with chronic myeloproliferative diseases and frequencies of 46/1 haplotype in different Chinese nationalities].

Somatic gene V617F mutation in JAK2 is a critical molecular and biological indicator to diagnosis of chronic myeloproliferative disease (MPD). This study was aimed to investigate the genetic background of V617F mutation in 46/1 gene haplotype in Chinese MPD patients, and the frequencies of 46/1 gene haplotype and V617F mutation in three nationalities of Chinese populations. Peripheral blood or bone marrow samples of 150 V617F mutation positive MPD patients, 123 V617F mutation negative MPD patients, 124 healthy Han individuals, 395 healthy Tibetan individuals and 315 healthy Yugu individuals were collected. The allele-specific multiplex PCR method was established, the presence or absence of V617F mutation, the presence or absence of 46/1 haplotype, and the relationship between V617F and 46/1 haplotype were easily identified by agarose gel image. The results showed that the V617F mutation located in the 46/1 haplotype of 88 cases (58.67) among 150 V617F-positive MPD cases. In 814 Chinese healthy individuals including Han, Tibetan, Yugu nationalities, the frequency of the 46/1 gene haplotype was 38.37 without difference in the frequency among different nationalities, and no V617F mutation was found in Chinese healthy populations, The frequency of the 46/1 gene haplotype was 43.09 in V617F mutation negative MPD patients and was 69.33 in V617F mutation positive MPD patients, the latter was obviously higher than former and than that in healthy Han individuals. In conclusion, a multiplex PCR method has been developed that is simple and useful to identify V617F mutation in JAK2 gene and its relationship to the 46/1 haplotype. In more than half of Chinese V617F-positive MPD patients, the V617F mutation locates in 46/1 haplotype in JAK2. The frequencies of 46/1 haplotype are statistically insignificant among Han, Tibetan and Yugu nationality populations.

Recognition of copper and hydrogen sulfide in vitro using a fluorescein derivative indicator.

We report the development of a fluorescein-based chemosensor (L1) for monitoring ions or micromolecules (H(2)S). Copper ions are known to be toxic at high concentrations and hydrogen sulfide induces various problems. Herein we develop a simple method for detecting Cu(II) and H(2)S with high selectivity and sensitivity. The chemosensor L1 displays on-off-on type fluorescence change with alternately added Cu(II) and H(2)S to the media along with reversible forming-separating of the complex. The potential biomedical relevance of the chemical mechanisms involved in the detection of L1 is described.

[A study on human tongue cancer cells' proliferation affected by Lactobacillus acidophilus].

OBJECTIVE: To study the effects of Lactobacillus acidophilus (L. acidophilus) on the proliferation and cell cycle distribution of human tongue cancer cells (Tca8113 cells). METHODS: In vitro cultivated human Tca8113 cells were treated by L. acidophilus supernatant, inactivated bacilli, cell free extracts and normal culture medium respectively, which were 1, 4, 16-fold(s) dilutelly, to investigate the proliferous effects of Tca8113 cells using of inverted microscope, cell counting, sulforhodamine B (SRB) and flow cytometry. The free radicals and Ca2+ in Tca8113 cells were also studied by confocal laser scanning microscope (CLSM). RESULTS: At the 48th hour after adding different L. acidophilus components, the Tca8113 cells changed in shape from the diamond-like, polygonal and slabs into the elongated form. In the condition of different times and different culture concentrations, the proliferation of Tca8113 cells was significantly inhibited by L. acidophilus components, which enhanced as the time prolonged and the concentrations of each L. acidophilus components increased according to the cell counting and the SRB experimental analysis. The cell proliferation index (CPI) was significantly reduced (P<0.01). The free radicals and Ca2+ in Tca8113 cells under the effect of each L. acidophilus components for 48 h indicated an obviously rising (P<0.01). CONCLUSION: L. acidophilus restrains the proliferation of Tca8113 cells, which might be due to the increase in quantity of free radicals and Ca2+ in Tca8113 cells, and might be resulted from the release of metabolic products of L. acidophilus.