Image database analysis of Hodgkin lymphoma

Hodgkin lymphoma (HL) is a special type of B cell lymphoma, arising from germinal center B-cells. Morphological and immunohistochemical features of HL as well as the spatial distribution of malignant cells differ from other lymphoma and cancer types. Sophisticated protocols for immunostaining and the acquisition of high-resolution images become routine in pathological labs. Large and daily growing databases of high-resolution digital images are currently emerging. A systematic tissue image analysis and computer-aided exploration may provide new insights into HL pathology. The automated analysis of high resolution images, however, is a hard task in terms of required computing time and memory. Special concepts and pipelines for analyzing high-resolution images can boost the exploration of image databases.In this paper, we report an analysis of digital color images recorded in high-resolution of HL tissue slides. Applying a protocol of CD30 immunostaining to identify malignant cells, we implement a pipeline to handle and explore image data of stained HL tissue images. To the best of our knowledge, this is the first systematic application of image analysis to HL tissue slides. To illustrate the concept and methods we analyze images of two different HL types, nodular sclerosis and mixed cellularity as the most common forms and reactive lymphoid tissue for comparison. We implemented a pipeline which is adapted to the special requirements of whole slide images of HL tissue and identifies relevant regions that contain malignant cells.Using a preprocessing approach, we separate the relevant tissue region from the background. We assign pixels in the images to one of the six predefined classes: Hematoxylin⁺, CD30⁺, Nonspecific red, Unstained, Background, and Low intensity, applying a supervised recognition method. Local areas with pixels assigned to the class CD30⁺ identify regions of interest. As expected, an increased amount of CD30⁺ pixels is a characteristic feature of nodular sclerosis, and the non-lymphoma cases show a characteristically low amount of CD30⁺ stain. Images of mixed cellularity samples include cases of high CD30⁺ coloring as well as cases of low CD30⁺ coloring.     

Application of flow microcalorimetry to the study of dehydrofolate reductase activities in crude tissue homogenates

Calorimetric methods are becoming important analytical tools in several areas of biochemical and biological research. In this work, a flow microcalorimetric method has been applied to the determination of dihydrofolate reductase (DHFR) activities in rat and human malignant tissue homogenates. In contrast to other commonly used DHFR analytical assays, the sensitivity of flow microcalorimetry allows direct measurements of this enzyme in crude tissue preparations. Our experimental data from rat tissue homogenates show that liver has the highest level of enzyme activity, while lung and brain have lower amounts of DHFR activity. The liver enzyme has a higher activity atpH 4.5, but the optimumpH for the lung and brain enzymes is 6.8. The substrate/cofactor molar ratio which gives the highest levels of DHFR activity is 1/1.5 for the liver and lung enzymes and 1/2.5 for brain DHFR. The DHFR in these rat tissue homogenates is activated by KCl or NaCl: in the presence of these salts (0.6M), the values of enzyme activity are 1.5–3 times higher than in their absence. Using flow microcalorimetry, very low levels of DHFR activity were also measured in human bone tumour homogenates, demonstrating the potential of the technique in the analysis of this enzyme in malignant tissues.     

Detection of S-palmitoylated Proteins in Mouse Heart Tissue Based on Different Precipitation Methods

The acyl-biotinyl exchange (ABE) is widely used for detection of S-palmitoylated proteins by replacing palmitic acid with biotin, which is a common method for detecting S-palmitoylated proteins. In this study, the effects of acetone precipitation and methanol-chloroform precipitation on the detection of S-palmitoylation proteins in acyl-biotin exchange method were compared, and the S-palmitoylated proteins in mouse cardiac tissue were analyzed. First, N-ethylmaleimide (NEM) was used to block free sulfhydryls within protein molecules. Then, biotinylation reagent (HPDP-Biotin) was used to label the newly produced cysteine thiols that were resulted from treatment by hydroxylamine (HA) in mouse heart tissue. During the ABE reaction, excess unreacted NEM, HA and HPDP-Biotin were removed by precipitation of the proteins. Then, the S-palmitoylated proteins from heart tissue were labeled with ABE reaction based on different precipitation methods, and the S-palmitoylated proteins labeled with biotin were enriched by streptavidin agarose beads. The enriched proteins were analyzed by mass spectrometry, and 50 S-palmitoylated proteins were identified. Specifically, 23 S-palmitoylated proteins were identified in acetone precipitation assay group, and 37 S-palmitoylated proteins in the methanol-chloroform precipitation assay group were identified. 10 palmitoylated proteins were identified in both groups. The results showed that the combination of different precipitation methods could be helpful for the identification of palmitoylated proteins.     

Development and Validation of a Bioanalytical LC-MS/MS Method for Simultaneous Determination of Sirolimus in Porcine Whole Blood and Lung Tissue and Pharmacokinetic Application with Coronary Stents

Sirolimus is a hydrophobic macrolide compound that has been used for long-term immunosuppressive therapy, prevention of restenosis, and treatment of lymphangioleiomyomatosis. In this study, a simple and sensitive liquid chromatography-tandem mass spectrometry (LC-MS/MS) was developed and validated for the simultaneous determination of sirolimus in both porcine whole blood and lung tissue. Blood and lung tissue homogenates were deproteinized with acetonitrile and injected into the LC-MS/MS system for analysis using the positive electrospray ionization mode. The drug was separated on a C18 reversed phase column with a gradient mobile phase (ammonium formate buffer (5 mM) with 0.1% formic acid and acetonitrile) at 0.2 mL/min. The selected reaction monitoring transitions of m/z 931.5 → 864.4 and m/z 809.5 → 756.5 were applied for sirolimus and ascomycin (the internal standard, IS), respectively. The method was selective and linear over a concentration range of 0.5–50 ng/mL. The method was validated for sensitivity, accuracy, precision, extraction recovery, matrix effect, and stability in porcine whole blood and lung tissue homogenates, and all values were within acceptable ranges. The method was applied to a pharmacokinetic study to quantitate sirolimus levels in porcine blood and its distribution in lung tissue following the application of stents in the porcine coronary arteries. It enabled the quantification of sirolimus concentration until 2 and 14 days in blood and in lung tissue, respectively. This method would be appropriate for both routine porcine pharmacokinetic and bio-distribution studies of sirolimus formulations.     

Expression analyses of human cleft palate tissue suggest a role for osteopontin and immune related factors in palatal development

Cleft lip and/or palate (CL/P) is a common congenital malformation with a complex etiology which is not fully elucidated yet. Epidemiological studies point to different etiologies in the cleft lip and palate subgroups, isolated cleft lip (CL), isolated cleft palate (CP) and combined cleft lip and palate (CLP). In order to understand the biological basis in these cleft lip and palate subgroups better we studied the expression profiles in human tissue from patients with CL/P. In each of the CL/P subgroups, samples were obtained from three patients and gene expression analysis was performed. Moreover, selected differentially expressed genes were analyzed by quantitative RT-PCR, and by immunohistochemical staining of craniofacial tissue from human embryos. Osteopontin (SPP1) and other immune related genes were significantly higher expressed in palate tissue from patients with CLP compared to CP and immunostaining in palatal shelves against SPP1, chemokine receptor 4 (CXCR4) and serglycin (PRG1) in human embryonic craniofacial tissue were positive, supporting a role for these genes in palatal development. However, gene expression profiles are subject to variations during growth and therefore we recommend that future gene expression in CL/P studies should use tissue from the correct embryonic time and place if possible, to overcome the biases in the presented study.     

Medical applications of biopolyesters polyhydroxyalkanoates

Microbial polyhydroxyalkanoates(PHAs) are a family of biopolyesters produced by many wild type and engineered bacteria.PHAs have diverse structures accompanied by flexible thermal and mechanical properties.Combined with their in vitro biodegradation,cell and tissue compatibility,PHAs have been studied for medical applications,especially medical implants applications,including heart valve tissue engineering,vascular tissue engineering,bone tissue engineering,cartilage tissue engineering,nerve conduit tissue engineering as well as esophagus tissue engineering.Most studies have been conducted in the authors’ lab in the past 20+ years.Recently,mechanism on PHA promoted tissue regeneration was revealed to relate to cell responses to PHA biodegradation products and cell-material interactions mediated by microRNA.Very importantly,PHA implants were found not to cause carcinogenesis during long-term implantation.Thus,PHAs should have a bright future in biomedical areas.     

Review of recent advances in analytical techniques for the determination of neurotransmitters

Methods and advances for monitoring neurotransmitters in vivo or for tissue analysis of neurotransmitters over the last five years are reviewed. The review is organized primarily by neurotransmitter type. Transmitter and related compounds may be monitored by either in vivo sampling coupled to analytical methods or implanted sensors. Sampling is primarily performed using microdialysis, but low-flow push-pull perfusion may offer advantages of spatial resolution while minimizing the tissue disruption associated with higher flow rates. Analytical techniques coupled to these sampling methods include liquid chromatography, capillary electrophoresis, enzyme assays, sensors, and mass spectrometry. Methods for the detection of amino acid, monoamine, neuropeptide, acetylcholine, nucleoside, and soluble gas neurotransmitters have been developed and improved upon. Advances in the speed and sensitivity of these methods have enabled improvements in temporal resolution and increased the number of compounds detectable. Similar advances have enabled improved detection at tissue samples, with a substantial emphasis on single cell and other small samples. Sensors provide excellent temporal and spatial resolution for in vivo monitoring. Advances in application to catecholamines, indoleamines, and amino acids have been prominent. Improvements in stability, sensitivity, and selectivity of the sensors have been of paramount interest.     

Determination of Levamisole in Sheep Muscle Tissue by High-Performance Liquid Chromatography and Photo Diode Array Detection

A high-performance liquid chromatographic method for the determination of levamisole (LVM) residues in sheep muscle tissue is described. LVM was extracted with ethyl acetate under alkaline conditions and cleanup was performed by liquid-liquid partition between organic-basic and organic-acid medium. Finally, levamisole was back extracted with chloroform carefully transferred into a clean glass vial and evaporated to dryness at 50 °C under a gentle stream of nitrogen. The remaining dry residue was dissolved in the mobile phase used, filtered and an aliquot was injected automatically into the chromatograph for analysis. Chromatography was performed on a Zorbax^?SB-C₁₈ column at 50 °C and detection by a PDA detector monitored at λ_max 220 nm. The mobile phase was a mixture of 0.1 % trifluoroacetic acid (v/v) pH 2.0 and acetonitrile-methanol 3 : 2 (v/v) in a combination of 30 : 70 (v/v) and a flow rate of 1.0 mL min⁻¹, delivered isocratically. This analytical method was validated by assessing recovery efficiency using spiked muscle tissue samples with standard solutions in methanol at four fortification levels of 1/2 MRL, 1 MRL, 2 MRL and 4 MRL and five times for each concentration (n = 5). Mean recovery (R%) achieved for muscle tissue was 75.65 ± 2.74% with an acceptable Relative Standard Deviation RSD% = 10.4. The same method was used also for the analysis of kidney, liver and fat (perirenal) and the recoveries found were 70.25 ± 1.07% (RSD% = 1.52), 72.37 ± 3.6% (RSD% = 4.97) and 69.44 ± 2.22% (RSD% = 3.19), respectively. The limit of detection (LOD) for muscle tissue was found to be 2.0 μg kg⁻¹ and the limit of quantification (LOQ) 5.0 μg kg⁻¹. Revised: 4 and 24 January 2006     

Bioluminescent properties of obelin and aequorin with novel coelenterazine analogues

The main analytical use of Ca²⁺-regulated photoproteins from luminous coelenterates is for real-time non-invasive visualization of intracellular calcium concentration ([Ca²⁺]_i) dynamics in cells and whole organisms. A limitation of this approach for in vivo deep tissue imaging is the fact that blue light emitted by the photoprotein is highly absorbed by tissue. Seven novel coelenterazine analogues were synthesized and their effects on the bioluminescent properties of recombinant obelin from Obelia longissima and aequorin from Aequorea victoria were evaluated. Only analogues having electron-donating groups (m-OCH₃ and m-OH) on the C6 phenol moiety or an extended resonance system at the C8 position (1-naphthyl and α-styryl analogues) showed a significant red shift of light emission. Of these, only the α-styryl analogue displayed a sufficiently high light intensity to allow eventual tissue penetration. The possible suitability of this compound for in vivo assays was corroborated by studies with aequorin which allowed the monitoring of [Ca²⁺]_i dynamics in cultured CHO cells and in hippocampal brain slices. Thus, the α-styryl coelenterazine analogue might be potentially useful for non-invasive, in vivo bioluminescence imaging in deep tissues of small animals.     

In situ tissue regeneration through host stem cell recruitment

The field of tissue engineering has made steady progress in translating various tissue applications. Although the classical tissue engineering strategy, which involves the use of culture-expanded cells and scaffolds to produce a tissue construct for implantation, has been validated, this approach involves extensive cell expansion steps, requiring a lot of time and laborious effort before implantation. To bypass this ex vivo process, a new approach has been introduced. In situ tissue regeneration utilizes the body''s own regenerating capacity by mobilizing host endogenous stem cells or tissue-specific progenitor cells to the site of injury. This approach relies on development of a target-specific biomaterial scaffolding system that can effectively control the host microenvironment and mobilize host stem/progenitor cells to target tissues. An appropriate microenvironment provided by implanted scaffolds would facilitate recruitment of host cells that can be guided to regenerating structural and functional tissues.     

Double stable isotope ultra performance liquid chromatographic-tandem mass spectrometric quantification of tissue content and activity of phenylethanolamine N-methyltransferase, the crucial enzyme responsible for synthesis of epinephrine

Here, we describe a novel method utilizing double stable isotope ultra performance liquid chromatography-tandem mass spectrometry to measure tissue contents and activity of phenylethanolamine N-methyltransferase (PNMT), the enzyme responsible for synthesis of the stress hormone, epinephrine. The method is based on measurement of deuterium-labeled epinephrine produced from the reaction of norepinephrine with deuterium-labeled S-adenosyl-l-methionine as the methyl donor. In addition to enzyme activity, the method allows for determination of tissue contents of PNMT using human recombinant enzyme for calibration. The calibration curve for epinephrine was linear over the range of 0.1 to 5,000 pM, with 0.5 pM epinephrine representing the lower limit of quantification. The calibration curve relating PNMT to production of deuterium-labeled epinephrine was also linear from 0.01 to 100 ng PNMT. Intra- and inter-assay coefficients of variation were respectively 12.8 % (n?=?10) and 10.9 to 13.6 % (n?=?10). We established utility of the method by showing induction of the enzyme by dexamethasone in mouse pheochromocytoma cells and strong relationships to PNMT gene expression and tissue epinephrine levels in human pheochromocytomas. Development of this assay provides new possibilities for investigations focusing on regulation of PNMT, the crucial final enzyme responsible for synthesis of epinephrine, the primary fight-or-flight stress hormone.

Biotechnological Approaches for Production of Artemisinin,an Anti-Malarial Drug from Artemisia annua L.

Artemisinin is an anti-malarial sesquiterpene lactone derived from Artemisia annua L. (Asteraceae family). One of the most widely used modes of treatment for malaria is an artemisinin-based combination therapy. Artemisinin and its associated compounds have a variety of pharmacological qualities that have helped achieve economic prominence in recent years. So far, research on the biosynthesis of this bioactive metabolite has revealed that it is produced in glandular trichomes and that the genes responsible for its production must be overexpressed in order to meet demand. Using biotechnological applications such as tissue culture, genetic engineering, and bioreactor-based approaches would aid in the upregulation of artemisinin yield, which is needed for the future. The current review focuses on the tissue culture aspects of propagation of A. annua and production of artemisinin from A. annua L. cell and organ cultures. The review also focuses on elicitation strategies in cell and organ cultures, as well as artemisinin biosynthesis and metabolic engineering of biosynthetic genes in Artemisia and plant model systems.     

Effect of starch content on the biodegradation of polycaprolactone/starch composite for fabricating in situ pore-forming scaffolds

Bone tissue engineering is an efficient approach to regenerating bone-related defects. The optimal scaffold used for bone tissue engineering must possess adequate porosity and suitable mechanical properties. This work described the development of a biodegradable polymeric composite based on polycaprolactone (PCL) and starch that can form a porous structure in situ. The scaffold exhibited the required mechanical properties at the initial stage of implantation by controlling in situ degradation and subsequent pore formation. PCL/starch (SPCL) scaffolds with 100/0, 70/30, and 50/50 ratios were developed. Degradation studies were performed in phosphate buffer saline (PBS) containing α-amylase or lipase at 37 °C for 4 weeks. Fourier-transform infrared spectroscopy was used to analyze chemical bonds and their changes after degradation. Differential scanning calorimetry was applied to determine the crystallinity and recrystallization of samples before and after degradation. Mass loss and starch release were observed during degradation, and the porosity of samples was measured by the ethanol replacement method. Morphology was further determined using scanning electron microscopy. Finally, variations in compressive strength and modulus during degradation and pore formation were also measured. The porosity of samples reached 45% after 1 month of degradation, and mechanical properties were still appropriate for human bone tissue. Reduction in mechanical property after mass loss, starch release and pore formation was controlled by the hydrogen bonding and recrystallization effect of PCL after degradation. Results suggested that SPCL composite had potential to form porous scaffold with adequate mechanical properties in situ and is promising for bone tissue engineering applications.     

Establishment and Quality Assessment of Tissue Cultures in Glycyrrhiza uralensis Fisch.

In this study, seedling, callus, cell, and adventitious root of Glycyrrhiza uralensis Fisch. have been established. In order to find the best one for producing G. uralensis active constituents, triterpenoid saponins and flavonoids in native root and tissue cultures were determined, and the contents in different G. uralensis materials were analyzed using cluster analysis. The contents of triterpenoid saponins and glycyrrhizic acid in tissue cultures were much lower than that in native G. uralensis. The total flavonoids content we determined in adventitious root was 6.31 mg?g^?1, which was close to that of native root (9.82 mg?g^?1). Based on the cluster analysis, we found that G. uralensis cultures were not suitable for production of glycyrrhizic acid, while adventitious root had a greater capability of flavonoids production comparing to seedling, callus, and cell.     

Liquid chromatography tandem mass spectrometry method using solid-phase extraction and bead-beating-assisted matrix solid-phase dispersion to quantify the fungicide tebuconazole in controlled frog exposure study: analysis of water and animal tissue

This paper presents the development, optimization, and validation of a LC-MS/MS methodology to determine the concentration of the antifungal drug and fungicide tebuconazole in a controlled exposure study of African clawed frogs (Xenopus laevis). The method is validated on animal tank water and on tissue from exposed and non-exposed adult X. laevis. Using solid-phase extraction (SPE), the analytical method allows for quantification of tebuconazole at concentrations as low as 3.89 pg mL^?1 in 10 mL water samples. Using bead-beating-assisted matrix solid-phase dispersion (MSPD), it was possible to quantify tebuconazole down to 0.63 pg mg^?1 wet weight liver using 150 mg tissue. The deuterated analogue of tebuconazole was used as internal standard, and ensured method accuracy in the range 80.6–99.7 % for water and 68.1–109 % for tissue samples. The developed method was successfully applied in a 4-week X. laevis repeated-exposure study, revealing high levels of tebuconazole residues in adipose and liver tissue, and with experimental bioconcentration factors up to 18,244 L kg^?1.     

Thermo-responsive gelatin-functionalized PCL film surfaces for improvement of cell adhesion and intelligent recovery of gene-transfected cells

Efficient local gene transfection on a tissue scaffold is dependent on good cell-adhesion characteristics. In this work, the thermo-responsive gelatin-functionalized polycaprolactone (PCL) films were proposed for improvement of cell adhesion and intelligent recovery of gene-transfected cells. Functional copolymer brushes (PCL-g-P(NIPAAm-co-MAAS)) were first prepared via surface-initiated ATRP of N-isopropylacrylamide (NIPAAm) and methacrylic acid sodium salt (MAAS) from the initiator-funcationalized PCL surfaces. The pendant carboxyl end-groups of the PCL-g-P(NIPAAm-co-MAAS) surface were subsequently coupled with gelatin via carbodiimide chemistry to produce the thermo-responsive gelatin-functionalized PCL surface. The thermo-responsive gelatin-functionalized PCL film surface can improve cell adhesion and proliferation above the LCST of P(NIPAAm) without destroying cell detachment properties at lower temperatures. The dense transfected cells can be recovered simply by lowering culture temperature. The thermo-responsive gelatin-functionalized PCL films are potentially useful as intelligent adhesion modifiers for directing cellular functions within tissue scaffolds.     

Phospholipid dynamics in ex vivo lung cancer and normal lung explants

In cancer cells, metabolic pathways are reprogrammed to promote cell proliferation and growth. While the rewiring of central biosynthetic pathways is being extensively studied, the dynamics of phospholipids in cancer cells are still poorly understood. In our study, we sought to evaluate de novo biosynthesis of glycerophospholipids (GPLs) in ex vivo lung cancer explants and corresponding normal lung tissue from six patients by utilizing a stable isotopic labeling approach. Incorporation of fully ¹³C-labeled glucose into the backbone of phosphatidylethanolamine (PE), phosphatidylcholine (PC), and phosphatidylinositol (PI) was analyzed by liquid chromatography/mass spectrometry. Lung cancer tissue showed significantly elevated isotopic enrichment within the glycerol backbone of PE, normalized to its incorporation into PI, compared to that in normal lung tissue; however, the size of the PE pool normalized to the size of the PI pool was smaller in tumor tissue. These findings indicate enhanced PE turnover in lung cancer tissue. Elevated biosynthesis of PE in lung cancer tissue was supported by enhanced expression of the PE biosynthesis genes ETNK2 and EPT1 and decreased expression of the PC and PI biosynthesis genes CHPT1 and CDS2, respectively, in different subtypes of lung cancer in publicly available datasets. Our study demonstrates that incorporation of glucose-derived carbons into the glycerol backbone of GPLs can be monitored to study phospholipid dynamics in tumor explants and shows that PE turnover is elevated in lung cancer tissue compared to normal lung tissue.Subject terms: Cancer metabolism, Lung cancer     

Preparation of enzymatically cross-linked sulfated chitosan hydrogel and its potential application in thick tissue engineering

For the requirement of preliminary vascularization, the scaffolds for thick tissue engineering should possess not only good cell affinity, but also anticoagulant ability. In this paper, an enzymatically crosslinked hydrogel scaffold based on sulfated chitosan (SCTS) was prepared. Firstly, sulfated chitosan-hydroxyphenylpionic acid (SCTS-HPA) conjugate was synthesized, and its structure was identified by FITR and ¹H NMR. And then an enzymatically crosslinked hydrogel was prepared in the presence of horseradish peroxidase (HRP) and hydrogen peroxide (H₂O₂). The gelation time, mechanical property, morphology and cytotoxicity to human umbilical vein endothelial cells (HUVECs) of the hydrogel was evaluated in vitro, the tissue compatibility of SCTS scaffold was studied in vivo. The results showed that the gelation time, mechanical property, morphology of the dehydrated hydrogel could be controlled by the HRP and H₂O₂ concentration. The cytotoxicity test showed that the hydrogel extracts had no cytotoxicity to HUVECs. The in vivo assay indicated that SCTS-HPA scaffold showed good tissue compatibility, and no thrombus formation. All these results indicated that the SCTS-HPA scaffold could be used as thick tissue engineering scaffold.     

Direct determination of sulfite in food samples by a biosensor based on plant tissue homogenate

In the work described here, a biosensor was developed for the determination of sulfite in food. Malva vulgaris tissue homogenate containing sulfite oxidase enzyme was used as the biological material. M. vulgaris tissue homogenate was crosslinked with gelatin using glutaraldehyde and fixed on a pretreated Teflon membrane. Sulfite was enzymatically converted to sulfate in the presence of the dissolved oxygen, which was monitored amperometrically. Sulfite determination was carried out by standard curves, which were obtained by the measurement of consumed oxygen level related to sulfite concentration. Several operational parameters had been investigated: the amounts of plant tissue homogenate and gelatin, percentage of glutaraldehyde, optimum pH and temperature. Also, some characterization studies were done. There was linearity in the range between 0.2 and 1.8 mM at 35 °C and pH 7.5. The results of real sample analysis obtained with the biosensor agreed well with the enzymatic reference method using spectrophotometric detection.     

Sustainable Development of Chitosan/Calotropis procera-Based Hydrogels to Stimulate Formation of Granulation Tissue and Angiogenesis in Wound Healing Applications

The formation of new scaffolds to enhance healing magnitude is necessarily required in biomedical applications. Granulation tissue formation is a crucial stage of wound healing in which granulation tissue grows on the surface of a wound by the formation of connective tissue and blood vessels. In the present study, porous hydrogels were synthesized using chitosan incorporating latex of the Calotropis procera plant by using a freeze–thaw cycle to stimulate the formation of granulation tissue and angiogenesis in wound healing applications. Structural analysis through Fourier transform infrared (FTIR) spectroscopy confirmed the interaction between chitosan and Calotropis procera. Latex extract containing hydrogel showed slightly higher absorption than the control during water absorption analysis. Thermogravimetric analysis showed high thermal stability of the 60:40 combination of chitosan (CS) and Calotropis procera as compared to all other treatments and controls. A fabricated scaffold application on a chick chorioallantoic membrane (CAM) showed that all hydrogels containing latex extract resulted in a significant formation of blood vessels and regeneration of cells. Overall, the formation of connective tissues and blood capillaries and healing magnitude decreased in ascending order of concentration of extract.