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The effect of Lactobacillus plantarum hydrolysates promoting VEGF production on vascular growth and hair growth of C57BL/6 mice

Journal of Analytical Science and Technology volume 10, Article number: 18 (2019) Cite this article

Abstract

Purpose

Angiogenesis is critical in various biological processes, such as blood vessel growth, fetal differentiation, wound healing, and organ regeneration. Various growth factors have been associated with vascular regeneration, including insulin-like growth factor 1 (IGF-1), transforming growth factor-β (TGF-β), and basic fibroblast growth factor (bFGF). One of the most important mediators of vascular regeneration is vascular endothelial growth factor (VEGF). VEGF is known to increase vascular permeability, induce the proliferation of endothelial cells, and stimulate capillary formation in vivo, which are core angiogenic functions.

Methods

The hydrolysates of lactic acid bacteria were produced by hydrolyzing Lactobacillus plantarum with proteases, treated with MG-63 osteoblasts, and screened to obtain samples with an excellent VEGF production effect. These samples were applied to human dermal papilla cells (hDPC) to examine the correlation between cell growth and VEGF secretion. Furthermore, the hair growth rate was measured in hair growth experiments using C57BL/6 male mice.

Results

The hydrolysates of the lactic acid bacteria produced in this study produced hair growth superior to the growth obtained with 5% minoxidil in hair growth experiments using C57BL/6 male mice.

Conclusions

This study aims to develop a material for application to the scalp that promotes angiogenesis in the scalp and facilitates the exchange of nutrients and wastes in the follicles to promote hair growth.

Background

Hair loss treatments applied directly to the scalp that are currently researched include helping hair growth by nutrient supply and the release of harmful elements through vasodilation or blood circulation promotion, reducing stress on the hair follicle by inhibiting the generation of reactive oxygen species (ROS) or nitric oxide (NO) that cause inflammation, reducing the risk factors of follicles by inhibiting the formation of cytokines, and strengthening the hair follicles by promoting angiogenesis (Hibino et al. 2004). Angiogenesis is a critical factor in various biological processes such as blood vessel growth, fetal differentiation, wound healing, and organ regeneration. Various growth factors have been associated with vascular regeneration, including tumor necrosis factor (TNF), transforming growth factor-β (TGF-β), and basic fibroblast growth factor (bFGF) (Suh et al. 2005). The formation of new blood vessels from existing capillaries is accomplished by a combination of angiogenic factors, extracellular matrix, and protease.

One of the most important mediators of vascular regeneration is vascular endothelial growth factor (VEGF). VEGF is known to increase vascular permeability, induce the proliferation of endothelial cells, and stimulate capillary formation in vivo, which are core angiogenic functions (Miele et al. 2000; Yeh et al. 1999). VEGF has been reported to induce alkaline phosphatase activity and enhance the response to parathyroid hormone in osteoblasts such as MG-63. Osteoblasts show the highest affinity for VEGF receptors, suggesting that many functional VEGF receptors are present in osteoblasts (Goad et al. 1996).

In particular, there are also reports that VEGF is secreted in dermal papilla cells. In light of the fact that there are rich capillaries in the papilla during hair growth, but that they disappear during the transition into the resting period, it is thought that the growth of blood vessels is associated with hair growth and thus that VEGF is involved in hair growth. VEGF has been also reported to reduce hair loss by promoting blood circulation and the formation of new blood vessels around follicles (Back et al. 1999).

The growth factors secreted from dermal papilla cells include basic fibroblast growth factor, insulin-like growth factor-1 (IGF-1), hepatocyte growth factor (HGF), fibroblast growth factor 1 (FGF1), and keratinocyte growth factor (KGF) (Kwon et al. 2007; Philpott et al. 1994; Mitsul et al. 1997). Transforming growth factor beta 2 (TGFβ2) has been found to be a key factor for inducing a regression period, as it is expressed in follicles when the hair transitions from the growth period into the regression period. In addition, TGFβ2 has been found to inhibit the proliferation of epithelial cells and shorten the human hair cycle (Park et al. 2016; Foitzik et al. 2005).

The representative drugs that stimulate hair growth are minoxidil and 5α-reductase inhibitors such as finasteride and dutasteride. These drugs have been approved by the U.S. Food and Drug Administration (FDA). Minoxidil was originally developed as a vasodilator for the treatment of hypertension. Although its mechanism of action on hair growth has not been clearly revealed, it is thought that the increase of nutritional supply through vasodilation and the K+ channel opening effect induce hair growth (Jamora et al. 2005; Buhl et al. 1990). Furthermore, minoxidil is considered to induce VEGF expression, promote the growth of cells, including follicular keratinocyte, that are used for hair growth, and improve blood circulation by stimulating vascular endothelial cells and smooth muscles, for minoxidil is also used for hypertension treatment (Messenger et al. 2004). Finasteride is a hair growth agent that prevents typical male hair loss by inhibiting the activity of 5α-reductase, a reductase that converts testosterone to dihydrotestosterone (DHT), which has the effect of preventing the death of follicle cells by DHT. However, sustained drug use is required to maintain the hair growth-promoting effect of finasteride, and side effects, such as sexual dysfunction in men and birth defects in pregnant women, have been reported (Do et al. 2011; Olsen et al. 2002).

To minimize these side effects, much research has been conducted on therapeutic agents and treatments that use natural materials for hair growth, and they suggest the possibility of developing agents that produce excellent hair growth from natural materials (Hwang et al. 2017; Hyung et al. 2007; Shapiro et al. 1998). Currently, clinical trials are being conducted on the hair growth-promoting effect of compounds using the root extracts of Rosa multiflora as a main component. Furthermore, the effects on hair growth of hair tonic, food containing medicinal herbs, algae extracts, and black bean extracts are being researched (Kim 2014; Choi et al. 2011; Ha et al. 2013; Jeon et al. 2011).

The Lactobacillus plantarum used in these experiments is widely used as a probiotic, and these lactic acid bacteria can be easily found not only in nature, but also in fermented foods and animal intestines (Chang et al. 2010; Choi et al. 2015). L. plantarum is used for antimicrobial activity, ACE (angiotensin-converting enzyme) inhibition, lipid metabolism, and hair growth (Axling et al. 2012; Joo 2011; Lee et al. 2012). It is also used as an individually acknowledged raw material for health foods that are commercialized as lactic acid bacteria products for skin health (Choi et al. 2013; Kang et al. 2009). Therefore, in this study, the effects on hair growth of L. plantarum proteins hydrolyzed using various proteases were analyzed in vitro and in vivo.

Results and discussion

Results

Cytotoxicity test after treatment of Lactobacillus plantarum hydrolysates

The L. plantarum enzyme hydrolysates were treated with MG-63 cells and human dermal papilla cells (hDPC) at concentrations of 0, 31.25, 62.5, 125, 250, and 500 μg/mL. They were cultured for 24 h and analyzed by CCK assay. The results are shown in Fig. 1. In the MG-63 cells (Fig. 1a), there were no significant differences between the control group and all groups except the Lactobacillus plantarum by Protamex (LP-P) group for concentrations of 0 up to 250 μg/mL. In the hDPC (Fig. 1b), the cells did not show toxicity for concentrations of 0 up to 250 μg/ml. Thus, cell growth experiments were carried out at a concentration of 200 μg/mL, which is the highest concentration that does not exhibit toxicity.

Fig. 1
figure1

Determination of the viability of a MG-63 cell and b hDPC (24 h). The values are the means ± SD of three independent experiments, and the cell proliferation effect on the hydrolysates was represented as a percentage. The letters a, b, c, d, and e above the bars stand for significantly different (p < 0.05) groups by one-way ANOVA, followed by Duncan’s multiple test. Cell viability was determined by CCK assay. *Values are the means ± SD of three independent experiments (n = 3)

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Measurement of growth rate after treatment with Lactobacillus plantarum hydrolysates

To determine the growth rates of MG-63 cells and hDPC, cell growth was measured for 10 days. The results are shown in Fig. 2. The L. plantarum enzyme hydrolysates were treated at a concentration of 200 μg/mL in the medium. MG-63 cells showed steady growth until the eighth day of growth, but the cell growth decreased after the eighth day. The growth rate of the LP-P group (see Fig. 1a) was lower than that of the other groups both up until, and after, 24 h of CCK assay. As shown in Fig. 2a, the LP, Lactobacillus plantarum by Alcalase (LP-A), and Lactobacillus plantarum by bromelain (LP-B) groups showed similar growth cycles to those of the control group, whereas LP-P showed rapid growth of 106.0 × 105 cells/mL at day 4 after culture, 91.0 × 105 cells at day 6, and 93.3 × 105 cells/mL at day 8.

Fig. 2
figure2

Growth of a MG-63 cells and b hDPC over 10 days. The control (con) group was not a treated sample, hydrolysates of L. plantarum (LP), hydrolysates of L. plantarum by Alcalase (LP-A), hydrolysates of L. plantarum by bromelain (LP-B), and hydrolysates of L. plantarum by Protamex (LP-P)

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The growth of hDPC was measured for 10 days and the results are shown in Fig. 2b. The samples showed steady growth for 10 days. The LP-P group in particular showed rapid growth on the eighth day. This result is the same as that of the MG-63 cells. The LP-P group showed the rapid growth of 5.28 × 105 cells/mL at day 6 of culture and 7.51 × 105 cells/mL at day 8.

Measurement of VEGF concentration

The amounts of VEGF and IGF-1 secreted from the MG-63 and hDPC growth medium were measured by ELISA, and the results are shown in Fig. 3 (a, b). The concentration of the LP-B-treated group in the MG-63 cells was 3730.44 pg/mL, which was 262.73% higher than that of the control group. The concentrations of LP-A and LP-P treatments were 2827.11 pg/mL and 2766.56 pg/mL, respectively, which were 199.11% and 194.84% higher than those of the control group, respectively. The results of VEGF measurement in the hDPC growth medium are shown in Fig. 3b. Similarly to the MG-63 cell concentrations, the VEGF concentrations in the LP-B group and the LP-P group were 148.58 pg/mL and 112.96 pg/mL, respectively, which were 221.60% and 168.47% higher than those of the control group (67.05 pg/mL), respectively. Madaan et al. (2017) reported that minoxidil sulfate demonstrated stimulation of VEGF in DPCs. The VEGF concentrations in the minoxidil (1 μM) were about 100 pg/mL.

Fig. 3
figure3

The effect of the concentration of vascular endothelial growth factor (VEGF) and insulin-like growth factor 1(IGF-1) on L. plantarum and on L. plantarum hydrolysates of MG-63 osteoblastic cell (a, c) and human dermal papilla cell (hDPC) (b, d). Data are expressed as a percentage of the control result. The control (con) group was not a treated sample, hydrolysates of L. plantarum (LP), hydrolysates of L. plantarum by Alcalase (LP-A), hydrolysates of L. plantarum by bromelain (LP-B), and hydrolysates of L. plantarum by Protamex (LP-P). All values are expressed as means ± S.D. (n = 3). The letters a, b, c, and d above the bars stand for significantly different (p < 0.05) groups by one-way ANOVA, followed by Duncan’s multiple test

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Measurement of IGF-1 concentration

The amount of IGF-1 secreted from the MG-63 growth medium was measured by ELISA, and the results are shown in Fig. 3 (c, d). The concentration of the LP-B-treated group in the MG-63 cells was 504.12 pg/mL, which was 128.04% higher than that of the control group. The concentrations of LP-A and LP-P treatments were 500.71 pg/mL and 467.82 pg/mL, respectively, which were 127.18% and 118.82% higher than those of the control group, respectively. The results of IGF-1 measurement in the hDPC growth medium are shown in Fig. 3d. The IGF-1 concentrations in the LP-P group and the LP-B group were 97.82 pg/mL and 94.12 pg/mL, respectively, which were 223.79% and 215.33% higher than those of the control group (43.71 pg/mL), respectively.

Hair growth (appearance)

After hair removal, the appearance of hair was visually observed and recorded (Figs. 4 and 5). On the first day of sample application, the skin color of the backs of all groups was scarlet, and the hair began to grow little by little from the seventh day of sample application. After 9 days, the entire skin that had been epilated was black, as the skin hair began to grow. On the 12th day after sample application, hair had grown in all groups, although there were differences among the groups. The LP-P group and the LP-B group had more hair than the control group. In particular, the LP-P group and the LP-B group showed the best hair growth.

Fig. 4
figure4

Photograph of hair growth in C57BL/6 mice. The animals were shaved with an electric clipper and the sample applied with 0.1 mL per to the dorsal skin of mice for 2 weeks. The photographs were taken at days 0, 4, 7, 10, and 14. Con: distilled water

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Fig. 5
figure5

Hair growth score. Hair regrowth was evaluated inspecting by the gray- or black-colored area (%) on the reverse side of the skin

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Hair growth (dorsal tissue)

It has been shown that when hair starts growing, the skin turns gray or black. Based on this report, it was observed that the LP-P group and the minoxidil group, which are the experimental groups, had completely black medial dorsal skin color and dilated blood vessels (Fig. 6). Because the hair had almost all grown out according to the visual observation of its appearance, it was confirmed that the hair had partially entered the regression period. The con, LP, and LP-A groups showed partially light gray skin, but, on visual observation, the part where the hair did not grow was found not to be entering the growth period, as it was observed in the medial dorsal tissues.

Fig. 6
figure6

Hair growth on the reverse side of the skin. After the gray skin color was detected, the skin was isolated and the reverse side was photographed to evaluate dilated blood vessels

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Discussion

Cell growth and VEGF were measured to determine the effect of L. plantarum hydrolysates on the proliferation and activity of MG-63 osteoblast-like cells and hDPC. After L. plantarum was hydrolyzed with Protamex, MG-63 osteoblast-like cells showed a high growth rate of 257% on the fourth day of culture, compared to the control group. The group hydrolyzed with bromelain showed a growth rate of 105% compared to the control group. This is thought to be due to the hydrolyzed peptide of lactic acid bacteria. hDPC produced steady hair growth for 10 days. In particular, the LP-P group showed rapid hair growth on day 8, and this result is the same as that of MG-63 cells.

VEGF is a growth hormone that is closely correlated with cell growth because it is secreted during the growth of osteoblasts such as MG-63 to induce cell migration, survival, and proliferation. It has been also reported to reduce hair loss by forming new blood vessels and promoting blood circulation around the hair follicles (Deckers et al. 2000). For stem cell cultures used in cosmetics, the concentration of VEGF was found to be about 3500–4000 pg/mL. The VEGF measured in the MG-63 cell media was 3730 pg/mL in bromelain hydrolysates and 2827 pg/mL in Protamex hydrolysates, which is higher by 262.73% and 199.11% than the figures for the control group (1420 pg/mL), respectively.

Cell growth was higher in the LP-P group than in the LP-B group, but the VEGF secretion rate was higher in the LP-B group. The VEGF secreted from the hDPC growth medium was measured as 149 pg/mL in the LP-B group and as 113 pg/mL in the LP-P group, which was 222% and 169% higher than the figures for the control group, respectively.

Hair growth was observed in the C57BL/6 mice. On the seventh day, the LP-P treatment group showed a skin color close to black, and hair growth was visually observed on the eighth day. In the LP-P, P-con, and LP-B groups, many blood vessels were observed to have expanded in the median dorsal skin tissues, and their skin color changed to black.

Materials and methods

Strain and medium used

Lactobacillus plantarum was purchased from KCCM (KCCM 11322, Korea Federation of Culture Collection, Seoul, Korea). MRS broth (Difco, Detroit, MI, USA) was used as the lactic acid bacteria culture medium and was anaerobically cultured at 37 °C for 48 h.

Production of Lactobacillus plantarum protein enzyme hydrolysates

The protease activity of L. plantarum, and Alcalase (Novozyme Co., Bagsvaerd, Denmark), bromelain (Novozyme), and Protamex (Novozyme), which are different types of protease, were reacted with the cultured L. plantarum by adjusting the active optimal temperature and pH (Alcalase, 50℃, pH 7; bromelain, 45℃, pH 7; Protamax, 60℃, pH 7). They were added to make a 1% protein concentration and hydrolyzed for 2 h (LP-A: L. plantarum hydrolysates by Alcalase; LP-B: L. plantarum hydrolysates by bromelain; LP-P: L. plantarum hydrolysates by Protamex). The protein concentration was determined by drawing a standard curve using the Bradford method with bovine serum albumin (BSA) at R2 = 0.9951 as a standard sample. These L. plantarum protein enzyme hydrolysates were freeze-dried and used as samples.

Cell culture

In this study, MG-63 osteoblast-like cells were used as controls for hDPC. The human osteoblast-like MG-63 cells used in this study were purchased from Korea Cell Line Bank (KCLB, Seoul, Korea), and the human dermal papilla cells (hDPC) were purchased from Cell Engineering for Origin (CEFO Co., Seoul, Korea). The cultured cells were subcultured in our laboratory. Ten percent FBS (Gibco, Grand Island, NY, USA) and 1% antibacterial-antifungal solution were added to the DMEM (Gibco, Grand Island, NY, USA). During the culture, 5% CO2 was continuously supplied while maintaining the temperature at 37 °C.

Cell toxicity and cell growth rate after treatment of Lactobacillus plantarum protein enzyme hydrolysates

A CCK assay was used to verify cytotoxicity. MG-63 cells and hDPC were dispensed at a concentration of 6 × 103 cells/well on a 96-well plate. After 24 h, the L. plantarum protein enzyme hydrolysates were added at concentrations of 0, 31.25, 62.5, 125, 250, and 500 μg/mL and cultured for another 24 h. After the culture, a CCK reagent (Dongin LS, Seoul, Korea) was added, and the hydrolysates were cultured for 2 h at 37 °C in a 5% CO2 incubator and measured at 450 nm using an ELISA reader. Each treatment group underwent the experimental treatment three times, and the cell proliferation effect on the hydrolysates was represented as a percentage.

To determine the cell growth rate, MG-63 cells were plated on a 100-mm dish at a cell number of 1 × 106 cells/mL, and hDPC was plated on a 100-mm dish at a cell number of 1 × 105 cells/mL. The L. plantarum protein hydrolysates were reacted with tryphan blue solution at 1:1, and the unstained live cells were counted every other day for 10 days and observed at × 20 magnification using an inverted microscope.

Measurement of growth factor

The vascular endothelial growth factor (VEGF) and insulin-like growth factor 1(IGF-1) concentrations were measured using the ELISA Kit (R & D Systems, Minneapolis, MN, USA). Fifty microliters of assay diluent was added to 200 μL of standard and culture samples, reacted at 37 °C for 2 h, and then washed three times. After that, 200 μL of conjugate was added and reacted at 37 °C for 2 h again. After washing three times, 200 μL of substrate solution was added and reacted at 37 °C for 20 min. Then, 50 μL of stop solution was added to stop the reaction. The absorbance was measured three times, and the absorbance value was calculated by subtracting the.

Experimental animals

Five-week-old C57BL/6 male mice were purchased from Samtako Bio Korea (O-San, Korea). The animals were allowed to eat food and drink water freely at a temperature of 24 °C ± 0.5 °C, a humidity of 55–65%, and 12 h of light cycle. They were used for the experiment after a 7-day period of adaptation.

Application of the sample

To apply the resting period during the circulation period of the hair, the back hair was first removed using an electric razor, and then the remaining hair was removed using a depilatory (Niclean, Ildong Pharmaceutical). There was no damage to the skin during hair removal, and continuous observation showed no inflammation. For each group, 100 μL of each extract and 5% minoxidil (Hyundai Pharm. Co., Korea) were applied to the backs whose hair had been removed twice a day (at 10:00 a.m. and 6:00 p.m.) for 14 days. Distilled water was used as a control.

Visual observation of hair growth

To verify the hair growth with the naked eye at 0, 4, 7, 10, and 14 days after the start of the experiment, Zoletil (Virbac, Paris, France) and Rumpun (Bayel Korea Co. Seoul, Korea) were mixed at 9:1, and the mice were anesthetized (10/10 g) by intraperitoneal injection and then photographed. The hair growth of each group was rated by visual observation as 0–9% (0 points), 10–19% (1 point), 20–29% (2 points), 30–39 (3 points), 40–49% (4 points), 50–59% (5 points), 60–69% (6 points), 70–79% (7 points), 80–89% (8 points), and 90–100% (9 points). On the 14th day of the experiment, the mice were killed by cervical dislocation, the dorsal tissues were removed, and the inside of the extracted skin was visually observed.

Statistical processing

All experimental results are expressed as means and standard deviations. A one-way ANOVA was conducted for the resulting data using SPSS 20 (SPSS Inc., Chicago, IL, USA), and the data were tested with Duncan’s multiple test at p < 0.05.

Conclusions

The L. plantarum protein hydrolyzed with Protamex promoted hair growth more than did the 5% minoxidil. Minoxidil, which was developed as a hypertension treatment, is currently the best hair growth drug applied to the scalp. However, if used for more than 1 month, it causes side effects such as skin itching and erythema, as well as systemic side effects, such as a decrease in blood pressure. Thus, minoxidil is difficult to use for a long period. However, the hydrolysates of lactic acid bacteria proposed in this study demonstrated superior effects to 5% minoxidil without these side effects through hair growth experiments using C57BL/6 male mice. These results suggest that L. plantarum and its hydrolysates can be used as basic materials for the production of cosmetic ingredients, health foods, and medicines for growth, osteoporosis, etc.

Abbreviations

bFGF:

Basic fibroblast growth factor

IGF-1:

Insulin-like growth factor 1

LP:

Lactobacillus plantarum

LP-A:

Lactobacillus plantarum by Alcalase

LP-B:

Lactobacillus plantarum by bromelain

LP-P:

Lactobacillus plantarum by Protamex

TGF-β:

Transforming growth factor-β

VEGF:

Vascular endothelial growth factor

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Acknowledgements

This work was supported by the Technology Innovation Program (10,077,377, Development of hair and anti-aging cosmetic materials using lactic acid bacteria enzyme hydrolysates) funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea) and supported by the Brain Busan 21+ project (BB21+).

Funding

Not applicable.

Author information

Affiliations

  1. Major in Pharmaceutical Engineering, Division of Bioindustry, College of Medical and Life Sciences, Silla University, 140 Baegyang-daero(Blvd), 700beon-gil(Rd.), Sasang-Gu, Busan, 46958, South Korea
    • Min Young Jo
    • , Mee Young Ahn
    • , Sang-Hyeon Lee
    • , Jong Myung Ha
    •  & Andre Kim
  2. Department of Natural Science Institute, Silla University, Busan, 46958, South Korea
    • Young Min Woo
    • , Ok Ju Kim
    •  & Eun Sol Jo
  3. Protein Structure Group, Korea Basic Science Institute, Chungcheongbuk-do, 28119, South Korea
    • Young-Ho Lee
  4. Department of Food Engineering, Silla University, Busan, 46958, South Korea
    • Jae-Suk Choi
  5. School of Acu-moxibustion and Tuina, Liaoning University of Traditional Chinese Medicine, Shenyang, 110847, China
    • Chun-ri Li
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Contributions

YW, OK, EJ, and MJ carried out the experiments. YW, MA, YL, and CL drafted the manuscript. SL, JC, JH, and AK guided the research and modified the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Andre Kim.

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Woo, Y.M., Kim, O.J., Jo, E.S. et al. The effect of Lactobacillus plantarum hydrolysates promoting VEGF production on vascular growth and hair growth of C57BL/6 mice. J Anal Sci Technol 10, 18 (2019). https://doi.org/10.1186/s40543-019-0178-0

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Keywords

  • Vascular endothelial growth factor (VEGF)
  • Lactobacillus plantarum
  • Protease
  • Human dermal papilla cell (hDPC)
  • Hair growth