15 December 2014 Extension of the concept of an anomalous water component to images of T-cell organelles
Author Affiliations +
J. of Biomedical Optics, 19(12), 126008 (2014). doi:10.1117/1.JBO.19.12.126008
Abstract
Microscopic images of a living cell are the main source of information on its functional state. Modern interference microscopy techniques allow the numerical parameters of cell images to be obtained with an accuracy not available with other methods. Quantitative analysis of phase images of T lymphocytes (TCs) in different functional states demonstrated that variations of the properties of intracellular water should be taken into account. This conclusion agrees with the current view that the physical parameters of water, including the refractive index (RI) of a water layer, depend on the hydrophilicity and other characteristics of the adjacent surface. Application of this concept to phase images of TCs showed that the contribution of the fourth phase of water (4-water) or the structured water component, which has an increased RI, should be considered. The proportion of 4-water depends on the functional state of the cell determined by the culture medium composition. Normally, the proportion of 4-water in organelles is as high as 30%; it is considerably lower in organelles of cells with inhibited metabolism.
Tychinsky: Extension of the concept of an anomalous water component to images of T-cell organelles

1.

Introduction

Water is one of the best studied environmental objects. Its properties are dealt with in a number of studies (reviewed in Ref. 1). Therefore, new data on structured water or the fourth phase of water (4-water) summarized and systematized in a recent book by Pollack2 are of particular interest. The 4-water has a number of anomalous properties expressed in the so-called exclusion zones of water layers adjacent to hydrophilic surfaces and in gels. Two simple examples clearly illustrate these properties of 4-water. The refractive index (RI) of a gel containing 99% of water has been found to drastically decrease from n=1.43 to n0=1.333 (a value characteristic for ordinary water) upon heating by only 1°C.3 The second example is an RI of a water n1.43 at the hydrophilic surface of Nafion, a synthetic polymer with ionic properties.4,5,6

Cells of most organisms contain as much as 80% of water; in jellyfish, the percentage exceeds 95%. Therefore, it is logical to assume that the component referred to as 4-water2 somehow affects microscopic phase images of cells and is detectable in these objects.78.9.10.11 However, we have not found any mention of such a phenomenon in the literature. This also applies to cell images obtained by various interference microscopy methods; no effect of 4-water on the images has been reported.1213.14.15

Quantitative analysis of phase images of various cell types78.9.10.11.12 has shown that the changes in their optical parameters caused by external factors cannot be solely explained by alterations of their proteins. In solving this problem, we suggested78.9.10.11.12 that not only the change in protein RI averaged by the cell volume should be taken into account, but the possibility that the RI of intracellular water is changed should also be assumed. To test this hypothesis, we took advantage of the unique properties of cell phase images16 and original algorithms.10,11

Here, we used RI measurements of T lymphocyte (TC) to calculate the proportion of the anomalous water component (4-water) in the organelles. To our knowledge, these are the first quantitative estimations of the mass fraction of 4-water in TC organelles. We present data on the 4-water effect on the organelle contrast in the phase image of a cell. For this purpose, we proposed a multicomponent optical model of a TC.

The basic assumption of our hypothesis is the existence of 4-water as a factor that contributes to RI. We also hypothesized that the proportions of 4-water and ordinary water in a living cell depended on its functional state.6,7 Below, we provide a biophysical interpretation of the variation of the 4-water contribution to the RIs of organelles and an explanation of its dependence on the hydrophilic/hydrophobic properties of organelles’ membranes. We believe that our results can be used for explaining other phenomena in cell biophysics.

2.

Theory

2.1.

Optical Model: Concept of Zones and Characteristic Parameters in the Phase Image of the Cell

Common for all interference methods is the representation of the images in the form of a two-dimensional distribution h(x,y) of optical path difference (OPD) in the image plane. The most important and the unique advantage of the interference microscopy is the measurement of OPD in absolute units of wavelength78.9.10.11.12.13.14.15.16.17.18.19 with a very high precision, which is hardly achievable or is even impossible with other methods. Normally, the phase image is described as the function

h(x,y)=(n(x,y,z)n0)dz
in the image plane (x,y), where n(x,y,z) and n0 are the refractive indices of the object and the environment, respectively. The function h(x,y) can be interpreted as a “projection” of the refractive index onto the image plane. Under certain conditions, the inverse problem can be solved when the function h(x,y) is restored from its projection.

We also used an optical model of TC.11 Its structure was represented by a limited number of spherical layers with different RIs (ni) or refractivities Δni=nin0. In the phase image h(x,y), these layers were projected onto the plain (x,y) as zones outlined with the contours hij(x,y)=const (Fig. 1). We have previously shown the possibility of determining the physical parameters of structural elements at the boundaries of these zones10,11 as a system of concentric spherical layers with the diameters dij and volumes Vij=π(di3dj3)/6. In general, the value of OPD at the boundary of j, j+1’th zones can be represented as the sum: hj,j+1=HjiΔn, where Δni=nin0 is its refractivity; in the geometric path Hji, the first index j corresponds to the position of the point, and the second index i corresponds to the number of the layer (1ij). The OPD “jumps” in the image plane (x,y) in the proximity of the points that are the projections of the adjacent layer due to the difference (Δnj+1Δnj).

Fig. 1

Physical basis of the concept of significant parameters of phase images. Algorithms and other tools used for phase image analysis. (a) A phase image h(x,y) of a T lymphocyte (TC) obtained using an interference microscope as a two-dimensional distribution of the optical path difference in the plane (x,y). Structural elements differ from one another in the refractive index; their boundaries are shown as the contours hij(x,y)=const. Dotted circles dij have the same areas (Sij) as those outlined with the contours hij. Zones (1 to 4) represent TC organelles. (b) Phase thickness profiles h(x) and h(y) (dotted line) in diametric sections of a TC image. The values hij (j=i+1) correspond to the boundaries between structural elements: 01, the external medium and the peripheral cytoplasm; 12, the cytoplasm and the endoplasmic reticulum; 23, the endoplasmic reticulum and the nucleus; 34, the nucleus and the nucleolus. (c) The plot of the integral function of the area S(h). Characteristic points with coordinates [Sij,hij] where the derivative dS/dh has maxima are shown. The hij values correspond to the positions of boundaries in Figs. 1(a) and 1(b). (d) The h(r) plot interpreted as a centrally symmetric equivalent of the real profiles h(x) and h(y) of the TC phase thickness in the normal state. The radius of the circle at the boundary of organelles in Fig. 1(a) (rij) is determined from the area Sij=πrij2 Sij=π(rij)2 in the ij’th characteristic point in Fig. 1(c). (e) The integral function W(h) of the phase volume reflects the optical heterogeneity of the TC. The peripheral cytoplasm makes a contribution to the phase volume of zone 1 (W1=W01W12) limited by the radii r01 and r12. The largest contribution to the phase volume of zone 3 is made by the nucleus. The Wij values are related to the organelle refractivities and are important parameters of the phase portrait of the cell. These images have been obtained using the raster scanning method.1617.18.19 (f) The refractivity profile Δn(r) of the TC in the normal state. The low Δn1(r)0.01 between r01 and r12 in the region of zone 1 corresponds to the peripheral cytoplasm. A considerable increase in refractivity has been observed in the optically dense endoplasmic reticulum region (zone 2) in the normal state. The nucleus (zone 3) accounts for the largest part of the cell volume with a somewhat lower optical density [Δn3(r)0.0320.035]. The local increase in refractivity δn45=Δn45Δn340.01 in the center of the cell corresponds to a higher density of the nucleolus. Twenty cells were measured in each media.

JBO_19_12_126008_f001.png

A very high resolution of phase images is an important and a specific feature of phase images obtained as a raster series of pixels with a high precision.1617.18.19 The phase thickness (hij) at the boundaries of organelles11 was determined from the coordinates of the characteristic points (CPs) of the integral functions of area:

(1)

S(h)=dxdy
and phase volume

(2)

W(h)=Δn(x,y,z)dxdydz.

These plots are shown in Figs. 1(c) and 1(d), respectively. The positions of the Sij(hij) and Wij(hij), the CPs and their abscissas on the plots were determined from the maxima of the derivatives dS/dh and dW/dh. This allowed us to exclude the minor nonuniqueness of the abscissas (hij) related to the asymmetry of cell shape and phase thickness profiles in Fig. 1(a). The following equation was used to determine the “equivalent” symmetric half-profile h(r) shown in Fig. 1(e):

(3)

S(h)=πr2(h).
This made it possible to use the diameters of circles interpreted as the boundaries of zones [Fig. 1(a)]:

(4)

dij=2(Sijπ)12.
Double indices (i and j=i+1) were used to designate the phase thickness (hij) and other parameters of the CPs. For example, the index ij=01 corresponded to the outer boundary of the cell and cytoplasm. The following main zones were distinguished: 0, environment (incubation medium); 1, peripheral cytoplasm; 2, its dense part (endoplasmic reticulum); 3, nucleus; and 4, nucleoli.

One can hypothesize that each organelle can be represented as a multicomponent spherical layer in the TC optical model.

2.2.

Multicomponent Optical Model

The ultimate goal of the study was to determine the proportion of 4-water in each layer at different functional states. For this purpose, we used the condition of additive contributions of components, which is well known from the physics of dielectrics. It consists in the presentation of the electrical (or optical) properties of a multicomponent medium as a sum of the electrical susceptibilities of its components:

(5)

χΣi=χi=ni2Σ1.

This is important since only susceptibility, but not RI, meets the condition of additive contributions of the components.

Here, we considered only two water and two protein components designated by double left subscripts (11 and 12 for water and 22 and 21 for protein). The subscripts for ordinary water and protein components are 11 and 22, respectively; those for anomalous components are 12 and 21, respectively. Component 12 is the aforementioned susceptibility of water molecules (4-water), e.g., in layers adjacent to the hydrophilic areas of membranes. Correspondingly, component 21 is the expected change in the susceptibility of protein molecules (4-protein). The notations used here for the proportions of components (η110 and η220), where the obvious condition η110+η220=1 should be met in an ideal medium (in the absence of anomalous components). The zero left superscript in ηii0 indicates the ideal medium. The summary susceptibility of this ideal binary medium (χΣ0) with the proportions η110 and η220 and susceptibilities χ110 and χ220 can be calculated as

(6)

χΣ0=χ110η110+χ220η220=χ110+η220(χ220χ110)=χ220+η110(χ110χ220).

For the known susceptibilities of the main components, ordinary water and protein (χ110 and χ220, respectively), it depends only on their weight proportions. Correspondingly, the total susceptibility of the four-component medium (including the anomalous water and protein components) is represented in the form of the equation

(7)

χiΣ=χi11ηi11+χi12ηi12+χi21ηi21+χi22ηi22
or as the χiΣ=klηiklχikl, where summation is performed over the indices of organelles (i) and their components (kl=1, 2) determining the susceptibility of each i’th layer. The normalization condition for the weight proportions of all components (ηikl) has the standard form klηikl=1.

Our third hypothesis is that the susceptibility of the medium of the i’th organelle and the parameters of the organelles of a T cell in the functional state p can be represented by the refractive and susceptibility indices of each i’th layer: (nip)2=1+χip. In these notations, the change in the susceptibility of the i’th organelle medium upon transition of the T cell from states p to q is

(8)

χipq=χipχiq=klηiklpχiklpklηiklqχiklq.

Within the correctness of the aforementioned three hypotheses, the refractivity and susceptibility profiles based on measurements of a TC can be used to quantitatively estimate the changes in the proportions of the components of their medium. In particular, this method allows the proportion of the anomalous water component (4-water) in organelles to be determined and used for biophysical interpretation.

We represented the functional state of a TC as its phase portrait, with “primary” parameters in the zones and their values of Sij(hij) and Wij(hij) at the boundaries. These parameters are universal because their estimates in the phase image of the cell are independent of its type and the optical model used. It has been demonstrated that, in the context of the aforementioned three hypotheses, the RIs of organelles found from the measurements can be used to quantitatively estimate the parameters of their medium. In particular, the proportions of the anomalous water component (4-water) in organelles have been determined and used for biophysical interpretation. The change in the proportion of 4-water (ηi12pηi12q) can be estimated from the values of (χi11pχi12p) known a priori and the results of the measurement of organelle refractivities (Δnip and Δniq) as

(9)

Δχi1pq=(χi11pχi12p)(ηi12pηi12q)=(ΔnipΔniq)(2n0+Δnip+Δniq).

3.

Materials and Methods

TCs isolated from the blood of a healthy donor were in the G0 phase. Details of the technique and specimen preparation have been described earlier.89.10.11 The functional state of TCs was changed by the addition of compounds with a known mechanism of pharmacological action. We used the concentrations of compounds generally reported in the literature for treatment of whole cells and organelles. Media are designated as follows: N, phosphate buffer saline (PBS); P, R, and F, PBS supplemented with 2μg/ml prednisolone, 1μM rotenone, and 4% formalin, respectively. We also exposed TCs to controlled He–Ne laser radiation (λ=633nm, 1 mW) with a light dose of 105J/m2. This laser was used as a source in the Airyscan coherent phase microscope for phase imaging of cells. The cells were placed into a cuvette under a cover slip, then the cuvette was fixed on a microscope stage.

Phase images h(x,y) of TCs in different incubation media were obtained using an Airyscan coherent phase microscope.89.10.11 All experiments were performed with the Olympus MD Plan 20* objective, NA 0.4. The raster method of image recording was used in contrast to the studies that employed the multistep method.1213.14.15 New physical parameters of TC organelles (the phase volume, exclusion zone areas, phase thickness, and RIs profiles) were obtained using our originally developed algorithms.10,11

4.

Results

The proposed approach is illustrated by TC images obtained with the Airyscan coherent phase microscope.11 Irradiation for as long as 40 min caused changes in the cells, expressed most distinctly in a decreased contrast of CPs in the plots of integral functions10 and a decreased phase thickness. Earlier we have demonstrated that the decrease of phase height of the isolated mitochondria and chloroplasts is proportional to the drop of the transmembrane potential.8,9 This state designated D was considered to correspond to a complete de-energization of cells (stopped metabolism). The refractivity profile Δn(r) (Fig. 2) corresponds to this energetically lowest state. Hereafter, we refer to the coordinates of CPs and the parameters at the boundaries of organelles, with the organelles indicated by the following subscripts: 1, cytoplasm; 2, endoplasmic reticulum; 3, nucleus; 4, nucleolus. As seen in Fig. 2, the N, P, R, and F components of the medium had differential effects on the refractivity profile of organelles. Prednisolone caused a local decrease in refractivity in zones 4 (the nucleolus) and 2 (the endoplasmic reticulum). The effects of rotenone and formalin were characterized by a more monotonous and a significant decrease in refractivity toward the cell periphery (zones 2 and 1). Noteworthy is a decreased contrast of the intermediate CPs (ij=12, 23 and 34) in the R and F refractivity profiles.11

Fig. 2

Refractivity profiles of a TC in different media. The indices N, P, R, and F indicate the states of the cell in these media: N, physiological phosphate buffer saline (PBS; normal state); P, medium containing prednisolone; R, the medium containing rotenone; F, medium containing formalin; D, PBS, 40 min of laser irradiation. The differences between the responses of organelles are represented in the refractivity profiles. Points with double indices indicate the radii (rij) of the organelle boundaries. The smallest changes have been observed in the prednisolone-containing medium. The general decrease in refractivity attributable to de-energization is the most distinct in the endoplasmic reticulum region. Twenty cells were measured in each media.

JBO_19_12_126008_f002.png

The effects of the incubation medium and other environmental factors on the functional state of TCs have been previously analyzed. It is known that rotenone blocks the complex 1 of the respiratory chain, and formalin inhibits metabolic processes. Manteifel and Karu20 have studied the effect of laser radiation on TCs in detail and obtained electron microscopic images of irreversible changes in the cell structural elements.20

The main goal of our study was quantitative estimation of the effect of 4-water and changes in its proportions in cell organelles Δηi12pq on the parameters of TC phase images. The estimation was based on the refractivity profiles Δn(r) shown in Fig. 2 and Eqs. (6) and (7) at n12=1.43 (χ12=1.05) for the RI of the anomalous 4-water component.89.10 For the anomalous protein component, we assumed n211.4 (at a susceptibility of χ21=1), the mean protein susceptibility being assumed to be χ22=1.2 (n22=1.44). These values corresponded to a difference of susceptibilities of χ12χ11=0.273.

Figure 3 shows the calculated profiles of changes in the proportions of 4-water Δηi12pq(r) in different media. Note that the change Δηi12ND(r) upon transition from the normal state into the de-energized one (ND) was the largest. The maximum changes were observed in the endoplasmic reticulum zone (i=2, Δη212ND40%) at a distance of r3.2μm from the nucleolar zone (i=4, Δη412ND20%). In the nuclear zone (r=1.5 to 2.0μm), the decrease in the 4-water share was smaller (Δη312ND10%); in the peripheral cytoplasm, it was almost indistinguishable (Δη112ND3%). As expected, the changes upon transitions from the R and P states into the D state (Δη12RD(r) and Δη12PD(r), respectively) were smaller. Noticeable changes in the proportions of 4-water occurred only at the periphery of the nucleus and in the endoplasmic reticulum zone, and only in the cells incubated in the prednisolone containing medium. The changes were detected only in the region of the maximum refractivity [point Δη212ND(r=3.2)].

Fig. 3

Changes in the proportion of fourth phase of water (4-water) Δη4(r) upon the transitions from N, R, P, and F states of TC (see Fig. 2) to fully de-energized D state (ND, RD, PD, and FD transitions). The largest changes have been observed in the endoplasmic reticulum (zone 2) and the nucleolus (zone 4).

JBO_19_12_126008_f003.png

Interpreting the results shown in Fig. 3, we used the refractivity profile of the whole cell (Δni). Equation (6) was used for quantitative estimation of the changes in the proportions of the components for protein and water. The ratio between the complete protein and water amounts was taken as ηi2/ηi1=1/4 according to the assumed constant 80% water content of the cell.

We also performed estimations for an alternative model of a cell, where the constant contribution of the protein component (20%) to the cell image was ignored. As expected, the changes in the refractivity (ΔnipΔniq) and susceptibility of water (χi1pq) were increased by ηi2/ηi1=1/4=25%.

For an alternative and unrealistic case of an “equivalent” cell with the constant parameters of ordinary water (Δnip=Δniq=1.333=const), the changes should be attributed to the protein component alone. This leads to the conclusion that the changes in the protein refractivity and susceptibility should be four times higher (ηi1/ηi2=4) than those indicated above for the variable water component. In such an “equivalent” cell, the ratio of refractivities Δnip and Δniq in organelles upon pq transition would be two times higher: (ηi22/ηi21)1/2=2. Obviously, these changes cannot be explained by any reasonable assumption.

As seen in Fig. 2, the changes in refractivity are the largest upon ND transition in the endoplasmic reticulum zone (i=2), where the difference reached Δn2NΔn2D0.025.

Therefore, even if we take the 25% underestimation of the 4-water RI that results from neglecting the contribution of the protein into account, we obtain reasonable values of the change in refractivity (n21=n0Δn21N=1.37) or the values Δn3NΔn3D0.037 upon ND transition at a protein proportion of η2=0.2. This corresponds to changes in susceptibility of Δχ3ND(3)0.051 and Δχ3ND(2.5)0.034.

In an alternative model, it should be assumed that the minimum RI of the nucleus in the completely de-energized state always remains within the interval n3D1.381.39 (χ3D0.90.93). Hence, in the energized states, the nucleus RI should vary only within the interval n3N1.51.59. Obviously, this result cannot be explained on the basis of known data.

Our analysis leads to the following preliminary conclusions:

  • 1. The measured RI values in different metabolic states of a TC cannot be explained assuming an 80% water component with invariable standard physical parameters.

  • 2. The only feasible explanation is the assumption of variable parameters for water.

5.

Discussion

This study considers a number of debated issues. The main one is the hypothesis of the existence of 4-water in a living cell. Monographs by Ling21 and Pollack2 were apparently the first to discuss the problem of a structured water component in cells. However, only the experimental finding of exclusion zones in water layers adjacent to hydrophilic surfaces made it possible to discuss the issue in terms of modern physics.6 The first and very important finding was the existence of 4-water with a higher RI compared to ordinary water. Hence, it is possible to detect 4-water by interference methods.45.6.7 Unfortunately, judging from the available literature, this fact has not been addressed at the level it deserves.

Measurements of RIs (or refractivity) of organelles of living cells, in particular, TCs,11 constituted the next step of research. We believe that this step was of no less importance for cell biophysics, because the use of cell volume averaged RI was insufficient for calculating the contribution of the anomalous 4-water component.

The available literature does not contain any discussion of the problem considered here, including that of 4-water in living cells. We were the first to use the numerical analysis of the dependence of refractivity values on electric susceptibility for determination of the cell organelle response to external factors, including the incubation media.7 There are grounds to believe that the concept of 4-water can be extended to other cell types, and new algorithms can be developed to quantitatively estimate this parameter. Evidently, similar results can be obtained for various cells using other types of interference microscopes.

6.

Concluding Remarks

In this study, we considered only two water components (indices 11 and 12) and two protein components (indices 22 and 21). Component 12 reflects the expected change in the contribution to the susceptibility of water (4-water) molecules in layers adjacent to hydrophilic areas of membranes. Correspondingly, component 21 should reflect a similar change in the susceptibility of protein (4-protein) molecules. We do not know a more primitive and a simple optical model of a cell that would allow the proportion of the anomalous water component to be estimated. Apparently, our third hypothesis that a cell (a TC, in the given case) can be considered as a multicomponent layered medium with (nip)2=1+χip does not contradict current views (see Sec. 2.2).

An important general conclusion is that the changes of the i’th organelle in the initial functional state p of a TC can be represented in terms of the contributions of different components of its susceptibility:

(10)

χipq=χipχiq=klηiklpχiklpklηiklqχiklq.

Acknowledgments

This study was supported by the Russian Foundation for Basic Research (Grant No. 13-02-00278) and the Ministry of Education and Science of the Russian Federation. I am grateful to A. Shtil for critical discussions, T. Vyshenskaya for T cell measurements, V. Zverzhkhovsky for design of original algorithms, and V. Ushakov for help in manuscript preparation.

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Biography

Vladimir P. Tychinsky (1925–2014), the prominent expert in basic and applied laser research, is among the pioneers in living cell microscopy. He established the laboratory of coherent phase microscopy and designed the original computer-aided interference microscopes. With these devices the unique properties of phase images, in particular, super-resolution, and cell dynamics became available for analysis. In his last paper he summarized his ideas about general mechanisms that may underlie an astonishing variety of cellular processes.

Vladimir P. Tychinsky, "Extension of the concept of an anomalous water component to images of T-cell organelles," Journal of Biomedical Optics 19(12), 126008 (15 December 2014). http://dx.doi.org/10.1117/1.JBO.19.12.126008
Submission: Received ; Accepted
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