JPH06234798A - Cell metabolism activator extracted from bovine placenta - Google Patents

Abstract

PURPOSE:To provide a cell metabolism activator which is a water-soluble protein extracted from bovine placenta, has a specific molecular weight estimation and isoelectric point and the excellent action to activate cell metabolism, thus can be used as a hepatonic agent, antiulcerative for stomach and duodenum, damage-repairing agent or immune activator. CONSTITUTION:The bovine postnatal placenta is minced without pretreatment such as washing, homogenized at a lowered temperature and stirred together with a low ion-concentration phosphate buffer solution containing sodium chloride, then allowed to stand for 6 hours or one overnight. The product is centrifuged to collect the supernatant and ammonium sulfate is added to the supernatant in the 20% saturation concentration. Then, the mixture is centrifuged to recover the supernatant, further ammonium sulfate is added to the supernatant in the 60% saturation concentration to collect the precipitate. The precipitate is dissolved again in water or physiological saline solution, purified by gel filtration to give the objective bovine placenta extract as a cell metabolism activator, having an estimated molecular weight of about 80,000 and 6.5 to 7.0 isoelectric point.

Description

Detailed Description of the Invention

[0001]

OBJECT OF THE INVENTION The present invention relates to a novel water-soluble protein extracted from the placenta after normal calving (delivery) of cattle. More specifically, it relates to a cell metabolism activating substance having a molecular weight of about 80,000, which is obtained by further fractionating a water-soluble protein extracted from bovine placenta.

[0002]

[Industrial field of use] Placental extracts are known to have effects such as tissue metabolism activating action and tissue regeneration repairing ability, and have been used as strong liver, antiulcer agents, damage repairing agents and the like.
The novel water-soluble protein according to the present invention is a fraction obtained from bovine placenta with an estimated molecular weight of about 80,000, and has a very remarkable cell metabolism activating action. That is, the bovine placenta-derived water-soluble protein according to the present invention has the effects of promoting the proliferation and spreading of fibroblasts, and also promoting the spreading of macrophages and increasing the phagocytosis. Therefore,
For example, as a drug, a strong liver drug, a stomach, a duodenal ulcer drug,
It is useful to be used as a damage repair agent, an immunostimulant, etc. directly or as a compounding agent. In addition, anticancer agents used in recent years such as cancer treatment are concerned that they may be too toxic to normal cells, or that they may gradually reduce the immune function of the living body by long-term administration. A substance that reinforces is attracting attention, but the novel water-soluble protein according to the present invention is
Concomitant use with such cancer therapeutic agents is also considered to be useful.

[0003]

2. Description of the Related Art Placenta of various origins (genus of animal species) is used as a starting material, and various extracts are used to extract the extract or the active ingredient, which is used for pharmaceuticals and cosmetics. It has been known for a long time. When the application and the extraction method of the water-soluble extract component (extract) are investigated, there are known publications as shown in Table 1, for example.

[Table 1] The extract of water-soluble components from the placenta as shown in Table 1 was examined by each extraction operation method, and it was found that the organic solvent, strong acid or strong alkali was used in common. Is. In addition to this, methods such as using a protease are also known. And
The pharmacological actions of these extracts include antiulcer action,
It has been shown to have a tissue metabolism activating action, and it has been suggested that a drug is used as a strong liver drug, a gastric or duodenal ulcer therapeutic agent in the form of an injection or an oral drug. In cosmetics, it is described that it is used in the form of an external preparation for the purpose of preventing skin aging (preventing wrinkles) and preventing spots (suppressing melanin pigment production).

It has been conventionally known that a substance having a tissue regeneration and repair ability is present in the placenta, but the method of determining its action or effect is not sufficient, and its reliability is high. poor. For example, it was evaluated by a method of using a tissue piece such as guinea pig skin and adding an extract or a component extracted from the placenta to this and obtaining the amount of oxygen consumed by using a Warburg pressure gauge or the like. It was nothing more than

[0005]

DISCLOSURE OF THE INVENTION The present inventors pay attention to the above-mentioned tissue metabolic activity or placenta regenerating and repairing action regarding a placenta extract, and re-evaluate the extract by these conventional extraction methods. Therefore, based on the establishment of more accurate test methods, we have been conducting research to obtain the body from the placenta. That is, the therapeutic effect of the extract derived from placenta has been established by clinical reports, but there is no evidence that this is true cell proliferating ability at the cellular level. Didn't. The present inventors focused on the important function of the placenta that promotes the growth of the fertilized egg in the body for 10 months by 100 million times, and directly
We have developed a method for quantitatively examining the proliferative effect on cells, and based on this we have begun to search for true placenta-derived cell metabolism activators.

[0006] The search method according to the present invention is as shown in the following section. As a result, all of the extracts shown in Table 1 above have a high activity directly against cells. I found that it was not. As a result of further examination of the cause, it was found that it was due in part to the extraction method according to the conventional method and the processing method for extracting the extract. This means that this substance
It is associated with instability to heat and organic solvents. That is, the anti-ulcer activity, tissue metabolism activating activity, etc. in the conventional clinical trials of the conventional placenta extract or the extract component, based on the examination by this test method, at least directly promote the proliferation of cells. It is hard to say that the therapeutic effect was obtained by
Rather, it was thought to be obtained by activating the metabolism of tissues from another mechanism of action.

The present inventors have found out what kind of operation should be used for the extraction means for finding out from the placenta a substance having a direct growth-promoting effect on cells, and to extract it by a conventionally known method. , Or why the isolated component has a small or no effect on promoting cell proliferation, and has been earnestly researching from these two points. As a result, it was possible to obtain an extract having a high cell growth promoting action together with the examination of cells used for evaluation and the probability of a new test method.

(Comment on measurement of cell growth promoting action) Regarding the cell growth promoting action, even the growth factors generally known today have few methods for accurately expressing their efficacy. However, various methods have been shown so far as methods for expressing cytotoxicity, and it has been established that, for example, suppression of the growth rate is quantitatively expressed by the number of cells, the amount of protein, or the like. Therefore, based on this cytotoxicity test, the present inventors have diligently studied a method of quantitatively expressing the ability to promote the growth rate by applying these, on the contrary. As a result, we have established a method to express the cell proliferation effect of the target substance by controlling the environment during cell culture and suppressing / controlling the cell growth rate of the control to near zero, if not killing it. Of. More specifically, this method is performed by adjusting the amount of fetal bovine serum (FBS) to be added in an environment in which cells are cultured.

The present inventors have studied various cell lines in the evaluation of the target substance at the initial stage of the research for establishing this test method. However, unlike normal cells, it was difficult to say that they are functional models of cells in the living body, so we finally decided to search for primary cells taken out from normal skin. That is, the cells were aseptically separated from the skin of guinea pigs, and cells that had not been mutated by substituting for a certain period were targeted, and the cell proliferation of the target substance was expressed. The method will be described in detail below.

Skin cells include epidermal cells and fibroblasts. For example, fibroblasts collected from guinea pigs (Hartley system, female) are Eagle MEM medium supplemented with 5% fetal bovine serum (FBS). It was confirmed that the cells proliferated and proliferated vigorously, and the multiple multiplication time was about 48 hours as shown in FIG. Then, this cell is established within about one year after being collected.

[Fig. 1] Therefore, in order to evaluate the cell growth ability of the target substance of the present invention, from the condition that the cells are as close to normal as possible, cells that have been grown and passaged up to 6 months after collection are frozen and stored. Therefore, we decided to use them one after another for the purpose of separating the target substance and examining the stabilization method against heat treatment.

On the other hand, regarding the culture environment, the influence of the fetal bovine serum (FBS) used on the cell growth promoting action was investigated from the change in its concentration, and during the culture, the cell growth was carried out without killing the cells and The standard was the minimum amount that satisfied the best conditions not to be accepted. Specifically, the relationship between the amount of FBS added to the system and the proliferation of fibroblasts is shown in FIG.

[FIG. 2] As shown here, when the amount of FBS added was 1% in the system, proliferation of fibroblasts was not observed in 9 days of culture. Therefore, this condition was used as a reference as a control.

The method for evaluating the proliferation ability of fibroblasts is as follows.
Petri dish with a diameter of 3.5 cm (Corning)
4-5 × 10 ⁴ cell suspension was dispensed per 1 mL, and the low concentration of FBS (amount without cell death and growth rate near zero: 1%) Eagle ME
The M medium is changed every 2-3 days. And the number of cells is 2
Measure every 3rd day using a Bürkertürk hemacytometer. At this time, the amount of protein or the amount of nucleic acid may be measured at the same time. The target substance used for measurement is adjusted (solution) with the amount of protein, and 1/10 of the amount of the medium is added every time the medium is replaced, and the same amount of physiological saline is added to the control. .

[0013]

The present invention is a water-soluble protein extracted from bovine placenta, which comprises a cell metabolism activating substance having an estimated molecular weight of about 80,000.

[0014]

The gist of the present invention is as described above, but in order to show it more concretely, examples and operations will be described below. Incidentally, in showing the embodiment, the basic points of the present invention are as follows.

(A) In the extraction method, a fresh placenta after normal calving (delivery) of cattle is used as the starting material.
If necessary, a placenta of other livestock animals such as pigs can be used, and it can be selected according to the therapeutic or pharmaceutical use of the target animal species, use such as cosmetics, etc. Good.

(B) In the examples, the simplest method is shown under the specified extraction conditions, but the point of operation in the extraction process is not to apply heat. Avoid extraction with organic solvent. It is necessary not to use strong acids, strong alkalis, and various proteolytic enzymes. That is, these treatment operations deactivate the activity of the target substance and should not be used. The feature of the extraction method from the placenta according to the present invention is that the conventionally known placenta extract, or the organic solvent, strong acid, strong alkali or enzyme used in the extraction method of the isolated component is not used during the process. Therefore, according to this, the substance of the present invention can be obtained by a combination of various methods for extracting conventional biological components, such as a centrifugation method, a salting-out fractionation method, a gel filtration method, a dialysis method, a low temperature or vacuum concentration method, and a freeze-drying method. Obtainable.

[0017]

Example 1 A placenta of a cow after normal calving is finely cut without pretreatment for washing and homogenized with a homogenizer or the like at low temperature. On the other hand, water or a buffer solution, for example, a low-ion-concentration phosphate buffer solution containing sodium chloride is added, stirred, and allowed to stand for 6 hours to 1 day and then centrifuged to obtain a supernatant. Next, ammonium sulphate was added to the supernatant to a concentration of 20% saturation, and the supernatant was recovered by centrifugation, and the concentration of 60% saturation was added to the supernatant. Ammonium sulphate is added again so that the resulting precipitate is recovered. The precipitate is dissolved in a small amount of water or physiological saline and then desalted.
The desalting operation includes methods such as gel filtration, ultrafiltration, and dialysis. Here, the method was carried out by placing in a dialysis tube and dialysis against a sufficient amount of physiological saline for one day or more.

[0018]

[Example 2] The extract having a high cell growth promoting action obtained in Example 1 requires sufficient consideration for virus inactivation in consideration of its use. For example, heat treatment at 60 ° C. for 10 hours is effective for inactivating the hepatitis virus. The lyophilized product of the liquid obtained in Example 1 was dissolved in water or saline and
After heat treatment at ℃ for 10 hours, it was found that even if it was effective for virus inactivation, the original purpose of promoting cell growth was 100% inactivated. Then, as a result of heat treatment under various conditions, it was found that the novel water-soluble protein which is the substance of the present invention completely deactivates the cell growth promoting action at 60 ° C. for 30 minutes. is there. Based on the above, as a means for maintaining the cell-proliferating action of this substance and inactivating only the hepatitis virus, various studies were made on a stabilization method that can withstand treatment at high temperature for a long time. As a means for this, for example, monosaccharides such as glucose and mannose, disaccharides such as sucrose and maltose, and the like were added and subjected to heat treatment.
It was found that this operation also causes inactivation.

The present inventors presumed that, when heat treatment at 60 ° C. was performed in a dissolved state, this treatment caused irreversible denaturation of the higher-order structure of the target substance protein, which resulted in inactivation. As a means to cope with this, it is possible to minimize the irreversible denaturation of the protein by changing the structure of the protein in advance in a high-concentration salt solution and then heating it in the precipitated state. Based on the idea that it might be, a new heat treatment method as shown in Example 3 was completed. This method is, of course, a convenient method that can be used as a method for heat stabilization of various conventionally known components derived from blood and organs.

[0020]

Example 3 The liquid obtained in Example 1 was freeze-dried and suspended in a 60% ammonium sulfate saturated solution or its precipitate was collected and subjected to heat treatment at 60 ° C. for 10 hours. . It was found that according to this method, the hepatitis virus was inactivated, and at the same time, the cell growth-promoting action remained at 80 to 90%. FIG. 3 shows the results of measuring the cell proliferation effect of the target substance after the treatment according to Example 3 in comparison with those obtained in Example 1.

FIG. 3 is a method shown in Example 3 for preventing inactivation of cell growth effect by heat treatment.
In addition, Examples 2-3 are based on a known method for inactivating hepatitis virus in protein preparations derived from serum and various organs.
This is performed at 60 ° C. for 10 hours, but in particular, according to the precipitation or suspension method using a high-concentration salt solution adopted in the process in Example 3, the temperature is further increased. Therefore, it is considered possible to reduce the processing time.

[0021]

[Example 4] The protein obtained in Example 1 or 3 is an extract having a direct metabolic activation effect on cells, and as it is, it is used as it is in a known field of use of conventional placenta extracts (medicine, cosmetics). Etc.), the present inventors tried the following fractionation in order to further pursue the active ingredient. First, regarding the precipitate obtained in Example 1 or 3,
The gel filtration was tried, and the components of each fraction flowing out with time were examined. Examples of the carrier used for gel filtration include Sephadex, agarose, Sephacryl, and the like. Here, Sephadex is used. (Fractionation conditions) Resin: Sephadex G-200 Column size: 31 x 370 mm Solvent: 0.01M phosphate buffer (pH of 0.14M NaCl)
7.4) Flow velocity: 2 cm / hr The outflow curves for this are shown in FIGS. 4 and 5.

[Figure 4]

FIG. 5 shows the components obtained in Example 1, and
FIG. 5 is an outflow curve of heat-treated components according to Example 3.

As a result of trying to measure the fibroblast proliferation ability of each fraction, as shown in FIG.
It was found that the active ingredient was present in -C and Fr-D (fractions flowing out near the Kav value of 0.18 to 0.80). Therefore, in order to pursue further details, an attempt was made to fractionate Fr-C and Fr-D by ion exchange. As the carrier used at this time, Sephadex,
Examples thereof include cation and anion exchangers such as Sepharose and Sephacryl, which are fractionated using DEAE-Sephadex. (Fractionation conditions) Resin: DEAE-Sephadex A-50 Column size: 20 x 200 mm Solvent: 0.1M-0.05N Tris-HCl buffer (pH 8.
0) Elution condition: NaCl concentration 0 → 0.5 M (divided into 0.05 M fractions) FIG. 7 shows an outflow curve for this.

[Figure 7]

Then, with respect to each fraction obtained by this fractionation operation, the fibroblast proliferation ability was measured in the same manner. As a result, the NaCl concentration was 0.05 to 0.10 M and 0.20 to 0.
Strong activity was seen in the fractions that shed during 25M. Then, again, this fraction was subjected to gel filtration using Sephadex G-200, and the outflow curve shown in FIG. 8 was obtained.

FIG. 8A shows a component flowing out at a NaCl concentration of 0.05 to 0.10 M, and B shows a component flowing out at 0.20 to 0.25 M.

[0024]

[Example 5] In order to measure the molecular weight of the active ingredient fractionated according to Example 4, the following three substances having known molecular weights were subjected to gel filtration with Sephadex G-200 to calibrate the Kav value and the molecular weight. A line was created and the molecular weight of the target substance was calculated. (Molecular weight known substance (standard substance)) A. Aldolase (Molecular weight 158,000) B. Bovine serum albumin (molecular weight 67,000) C.I. α-Chymotrypsinogen A (molecular weight 25,000) FIG. 9 is the standard line.

[Figure 9]

The yield of the substance of the present invention is 1 kg of bovine placenta.
From about 150-300 mg.

[0026]

INDUSTRIAL APPLICABILITY The present invention resides in a novel water-soluble protein obtained from bovine placenta. This protein has a very high direct metabolic activation effect on cells. In comparison with the conventionally known placenta extract extract or extract substance from the extraction conditions, the conventionally known extract extract or extract substance, in the process, organic solvent, strong acid, strong alkali, agents such as proteolytic enzyme It has been used, but the result is
These drugs have inactivated the cell growth promoting substance in the placenta. The characteristic of the conventional method is that the placenta or the homogenized placenta was washed as a pretreatment for the extraction operation, and as a result, the target substance was washed off. It is also considered that the material was deactivated even by simple heat treatment. In the present invention, a cell growth promoting agent present in the placenta of bovine was added to cells, and its growth ability was directly quantitatively verified by the number of cells. And
Furthermore, the cause of why the placenta extract by the conventional extraction method or its isolated substance does not show the cell proliferation action has been pursued. As a result, the inventors of the present invention were able to be completed, while finding out the chemicals used for extraction and the fact that they were deactivated in the process of heat treatment.

[0027]

[Brief description of drawings]

Fig. 1 shows that fibroblasts collected from guinea pigs (Hartley system, female) are 5% in volume of fetal bovine serum (FBS).
3 shows changes in the number of cells when cultured in Eagle MEM medium supplemented with. FIG. 2 shows the effect of fetal bovine serum (FBS) concentration in the culture medium on fibroblast proliferation. FIG. 3 shows the cell growth promoting action of water-soluble proteins extracted from bovine placenta before and after heat treatment. In the figure,
Cell growth effect by addition of extract before heat treatment, b) Cell growth effect by addition of extract after heat treatment,
Further, c is the cell proliferation action of the control group (physiological saline addition group). FIG. 4 is an outflow curve of the components precipitated with 60% ammonium sulfate by gel filtration using Sephadex G-200. FIG. 5 is an outflow curve of the product obtained by heat-treating the component precipitated with 60% ammonium sulfate by gel filtration using Sephadex G-200. FIG. 6 shows the fibroblast proliferation activity of each fraction obtained by fractionating the components precipitated with 60% ammonium sulfate using Sephadex G-200. FIG. 7 shows fractions C and D obtained by fractionating a water-soluble protein extracted from bovine placenta with Sephadex G-200.
The ion-exchange fractionated outflow curve is shown using AE-Sephadex A-50. FIG. 8 is an outflow curve of the active fraction fractionated with DEAE-Sephadex A-50 by gel filtration with Sephadex G-200. A in the figure is the ion exchange fraction, and the NaCl concentration is 0.05 to 0.
The fraction flowing out between 10 M, B in the figure, is a NaCl concentration of 0.20 to 0.
Sephadex G- for fractions spilled between 25M
Effluent curve by gel filtration at 200. FIG. 9 shows aldolase (molecular weight 158,000): A in the figure, bovine serum albumin (molecular weight 67,000): B in the figure, α-chymotrypsinogen A (molecular weight 25,000): Kav value and molecular weight prepared by using C in the figure as a marker protein. Is the standard line.

Claims (1)

[Claims] 1. A water-soluble protein extracted from bovine placenta,
A substance for activating cell metabolism, which has an estimated molecular weight of about 80,000 and an isoelectric point of about 6.5 to 7.0.