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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

Postal Subscription Code 80-974

2018 Impact Factor: 1.701

Front. Mater. Sci.    2022, Vol. 16 Issue (4) : 220622    https://doi.org/10.1007/s11706-022-0622-8
RESEARCH ARTICLE
Regulation of cell morphology and viability using anodic aluminum oxide with custom-tailored structural parameters
Zhiying ZHANG1, Ting LIU1, Juan LI1(), Yiyan GUO1, Ruiqing LIANG1, Jiangbo LU1, Runguang SUN1(), Jun DONG2()
1. School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, China
2. Department of Orthopaedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an 710004, China
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Abstract

Anodic aluminum oxide (AAO) with independently controlled period, porosity, and height is used as the model surface to study the single structural parameter effect on breast cancer cell behaviors, including cell polarity and cell viability. It is found that the quantity of multipolar cells and cell viability increases as the nanodent period increases from 100 to 300 nm, while the number of bipolar cells has almost no change until there is a dramatic decrease as the period increases to 300 nm. After anodizing nanodents into nanopores, the numbers of both bipolar cells and the cell viability increase significantly with the porosity increase. However, as the porosity further increases and the nanopore changes into a nanocone pillar, most of the cells become nonpolar spheres and the cell viability decreases. Increasing the height of the nanocone pillar has little effect on the cell polarity; the cell viability increases slightly with the increase of the nanocone pillar height. These results reveal the influence of individual nanostructure parameters on the cell behavior, especially the cell polarity and the cell viability, which can help to design the surface to make the cell grow as desired.

Keywords nanostructure parameter      breast cancer cell      cell morphology      cell polarity      cell viability     
Corresponding Author(s): Juan LI,Runguang SUN,Jun DONG   
Issue Date: 25 November 2022
 Cite this article:   
Zhiying ZHANG,Ting LIU,Juan LI, et al. Regulation of cell morphology and viability using anodic aluminum oxide with custom-tailored structural parameters[J]. Front. Mater. Sci., 2022, 16(4): 220622.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-022-0622-8
https://academic.hep.com.cn/foms/EN/Y2022/V16/I4/220622
Fig.1  Schematic diagram of the electrochemical experiment reactor.
SampleExperimental conditions
The 1st anodizationThe 2nd anodizationPore-widening time
D1000.3 mol·L?1 oxalic acid; 16 °C, 40 V, 6 h
D2000.3 mol·L?1 oxalic acid + 0.012 mol·L?1 sulfuric acid; ?4 °C, 110 V, 70 min
D3000.3 mol·L?1 oxalic acid + 0.001 mol·L?1 sulfuric acid; ?5 °C, 140 V, 70 min
PD1000.3 mol·L?1 oxalic acid; 16 °C, 40 V, 6 h0.3 mol·L?1 oxalic acid; 10 °C, 40 V, 307 s45 min
PD2000.3 mol·L?1 oxalic acid + 0.012 mol·L?1 sulfuric acid; ?4 °C, 110 V, 70 min0.015 mol·L?1 oxalic acid; ?4 °C, 110 V, 165 s20 min
PD3000.3 mol·L?1 oxalic acid + 0.001 mol·L?1 sulfuric acid; ?5 °C, 140 V, 70 min0.0075 mol·L?1 oxalic acid; 0 °C, 140 V, 240 s0 min
PW10.3 mol·L?1 oxalic acid + 0.001 mol·L?1 sulfuric acid; ?5 °C, 140 V, 70 min0.0075 mol·L?1 oxalic acid; 0 °C, 140 V, 240 s90 min
PW2150 min
h370 (PW3)0.3 mol·L?1 oxalic acid + 0.001 mol·L?1 sulfuric acid; ?5 °C, 140 V, 70 min0.35 mol·L?1 phosphoric acid; 10 °C, 120 V, 9 min160 min
h5500.35 mol·L?1 phosphoric acid; 10 °C, 120 V, 12 min
h6500.35 mol·L?1 phosphoric acid; 10 °C, 120 V, 15 min
Tab.1  Detailed experimental conditions for fabricating the self-ordered nanostructures with different structure parameters
SamplePeriod/nmPore diameter/nmHeight/nm
D100104±7??
D200207±9??
D300302±15??
PD10095±1383±5374±17
PD200198±578±3370±9
PD300303±1083±5372±15
PW1296±14153±8370±3
PW2297±11247±5365±9
h370 (PW3)303±15?371±14
h550307±11?546±7
h650308±12?647±12
Tab.2  Independently adjustable structure parameters of as-fabricated self-ordered nanostructures
Fig.2  Top row: SEM images of aluminum films with different period nanodent of (a) 0 nm (plane), (b) 100 nm (D100), (c) 200 nm (D200), and (d) 300 nm (D300). Middle row: SEM images of MDA-MB-231 cells culture for 48 h on the corresponding aluminum film. Bottom row: details of the pseudopodia of the corresponding cell.
Fig.3  Fluorescent images of MDA-MB-231 cells cultured for 48 h on (a) the plane aluminum film, (b) the aluminum film with 100-nm period nanodent, (c) the aluminum film with 200-nm period nanodent, and (d) the aluminum film with 300-nm period nanodent, where cell cytoskeletons are stained by FITC-phalloidin (left column), cell nuclei are stained by DAPI (middle column), and merged images of the above two (right column). (e) The ratio of multipolar cells (left slash), bipolar cells (right slash), and nonpolar cells (blank) cultured for 48 h on aluminum films with 100-nm (D100), 200-nm (D200), and 300-nm (D300) period nanodent, respectively, and the values on the plane aluminum film is also shown for comparison. (f) The cell viability on nanodent structured aluminum films with different periods, which are cultured for 24, 48, 72, and 96 h. The viability of cells grown on the plane surface is used as comparison, and the viability of cells cultured for 24 h on the plane surface was denoted as 100%. The statistical signification was marked as *p < 0.05, **p < 0.01.
Fig.4  Top row: SEM top views of AAO with the same pore diameter of 80 nm and the same pore depth of 370 nm, while their periods are (a) 100 nm, (b) 200 nm, and (c) 300 nm, which are denoted by PD100, PD200, and PD300 on the top right, respectively (the insert images are corresponding side views of the AAO). Bottom row: SEM images of MDA-MB-231 cell cultures for 48 h on PD100, PD200, and PD300 (the insert images show details of the pseudopodia of corresponding cells).
Fig.5  Fluorescent images of MDA-MB-231 cells cultured for 48 h on (a) plane aluminum film, (b) PD100, (c) PD200, and (d) PD300, where cell cytoskeletons are stained by FITC-phalloidin (left column), cell nucleus are stained by DAPI (middle column), and merged images of the above two (right column). (e) The ratio of multipolar cells (left slash), bipolar cells (right slash), and nonpolar cells (blank) cultured for 48 h on the AAO with the same pore diameter and the same pore depth, but with different nanopore periods of 100 nm (PD100), 200 nm (PD200), and 300 nm (PD300), respectively, and the value on the plane aluminum film is also shown for comparison. (f) The cell viability on AAO with different nanopore periods, cultured for 24, 48, 72, and 96 h. The viability of cells grown on the plane surface is used as comparison, and the viability of cells cultured for 24 h on the plane surface was denoted as 100%. The statistical signification was marked as **p < 0.01.
Fig.6  Top row: SEM top views of nanopore structured AAO with period of 300 nm whose pore widening time are (a) 0 min, (b) 90 min, (c) 150 min, and (d) 160 min, which are denoted as PD300, PW1, PW2, and PW3, respectively, and the pore diameters are 80, 150, and 250 nm for PD300, PW1, and PW2, respectively. For PW3, as the pore widening time increases, the nanopore structure disappears and only the nanocone pillar is left. The insert images are corresponding side views of AAOs, clearly showing that these AAOs also have the same depth of 370 nm. Bottom row: SEM images of MDA-MB-231 cells cultured on PD300, PW1, PW2, and PW3 for 48 h.
Fig.7  Fluorescent images of MDA-MB-231 cells cultured for 48 h on (a) PD300, (b) PW1, (c) PW2, and (d) PW3, where cell cytoskeletons are stained by FITC-phalloidin (left column), cell nucleus are stained by DAPI (middle column), and merged images of the above two (right column). (e) The ratio of multipolar cells (left slash), bipolar cells (right slash), and the nonpolar cells (blank) cultured for 48 h on PD300, PW1, PW2, and PW3, respectively. (f) The cell viability on PD300, PW1, PW2, and PW3, which are cultured for 24, 48, 72, and 96 h, respectively. The viability of cells grown on plane surface is used as comparison, and the viability of cells cultured for 24 h on the plane surface is denoted as 100%. The statistical signification was marked as **p < 0.01.
Fig.8  Top row: side-view SEM images of nanocone pillar structured AAOs with different heights of (a) 370 nm (h370), (b) 550 nm (h550), and (c) 650 nm (h650). Bottom row: SEM images of MDA-MB-231 cells cultured for 48 h on the corresponding AAO (the inserts are the representative cells).
Fig.9  Fluorescent images of MDA-MB-231 cells cultured for 48 h on (a) 370 nm-height, (b) 550 nm-height, and (c) 650 nm-height nanocone pillar structured AAOs, where cell cytoskeletons are stained by FITC-phalloidin (left column), cell nuclei are stained by DAPI (middle column), and merged images of above two (right column). (d) The ratio of multipolar cells (left slash), bipolar cells (right slash), and nonpolar cells (blank), which are cultured for 48 h on the nanocone pillar with heights of 370 nm (h370), 550 nm (h550), and 650 nm (h650). (e) The cell viability on 370 nm-, 550 nm-, and 650 nm-height nanocone pillars cultured for 24, 48, 72, and 96 h. The viability of cells grown on plane surface is used as comparison, and the viability of cells cultured for 24 h on the plane surface is denoted as 100%. The statistical signification is marked as *p < 0.05, **p < 0.01.
Sample Pseudopodia Cell polarity Cell viability (96 h)
Period Nanodent with different periods D100 Filapodia appear and coexist with lamellipodia Bipolar: 47.1%; multipolar: 29% 212.2%
D200 More filapodia Bipolar: 47.1%; multipolar: 41% 229.8%
D300 Only thicker filapodia Bipolar: 27.8%; multipolar: 50% 233.8%
Porosity Nanopore with different periods PD100 Filapodia appear and coexist with lamellipodia Bipolar: 63.4%; multipolar: 22.7% 224.7%
PD200 More filapodia Bipolar: 51.4%; multipolar: 35.1% 204.0%
PD300 Only thicker filapodia Bipolar: 24.3%; multipolar: 56.8% 198.5%
Nanopore with different diameters PD300 Only thicker filapodia Bipolar: 24.3%; multipolar: 56.8% 198.5%
PW1 Only thicker filapodia Bipolar: 48.2%; multipolar: 44.4% 239.0%
PW2 Coexistence of filapodia and lamellipodia Bipolar: 42%; multipolar: 30% 234.2%
Height Nanocone pillar with different heights h370 (PW3) Few filapodia Nonpolar: 63% 202.0%
h550 Nonpolar: 60% 210.3%
h650 Nonpolar: 60% 221.1%
Tab.3  Effect of nanostructure with independently controlled parameters on cell behaviors
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