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Sponges
Describes the life of sea sponges as the oldest living animals on Earth, including their history, number of species, functions, habitats, physical characteristics, diet, reproduction, and threats from predators and human consumption.
Book
The HMA-LMA Dichotomy Revisited: an Electron Microscopical Survey of 56 Sponge Species
The dichotomy between high microbial abundance (HMA) and low microbial abundance (LMA) sponges has been long recognized. In the present study, 56 sponge species from three geographic regions (greater Caribbean, Mediterranean, Red Sea) were investigated by transmission electron microscopy for the presence of microorganisms in the mesohyl matrix. Additionally, bacterial enumeration by DAPI-counting was performed on a subset of samples. Of the 56 species investigated, 28 were identified as belonging to the HMA and 28 to the LMA category. The sponge orders Agelasida and Verongida consisted exclusively of HMA species, and the Poecilosclerida were composed only of LMA sponges. Other taxa contained both types of microbial associations (e.g., marine Haplosclerida, Homoscleromorpha, Dictyoceratida), and a clear phylogenetic pattern could not be identified. For a few sponge species, an intermediate microbial load was determined, and the microscopy data did not suffice to reliably determine HMA or LMA status. To experimentally determine the HMA or LMA status of a sponge species, we therefore recommend a combination of transmission electron microscopy and 16S rRNA gene sequence data. This study significantly expands previous reports on microbial abundances in sponge tissues and contributes to a better understanding of the HMA-LMA dichotomy in sponge-microbe symbioses.
Journal Article
1,000-year-old sponges!
Many people don't know that sea sponges can live for many, many centuries. We often forget that sponges are even animals, but they are. This colorful and vibrant volume introduces young readers to the wild, wacky world of sponge life. Accessible text abounds with fascinating facts sure to surprise and inspire budding scientists. Children will be introduced to key concepts such as ecosystems, life cycles, environmentalism, and climate change, accompanied by stunning photographs of these strange creatures in their mysterious habitat.
Book
Microchannelled alkylated chitosan sponge to treat noncompressible hemorrhages and facilitate wound healing
Developing an anti-infective shape-memory hemostatic sponge able to guide in situ tissue regeneration for noncompressible hemorrhages in civilian and battlefield settings remains a challenge. Here we engineer hemostatic chitosan sponges with highly interconnective microchannels by combining 3D printed microfiber leaching, freeze-drying, and superficial active modification. We demonstrate that the microchannelled alkylated chitosan sponge (MACS) exhibits the capacity for water and blood absorption, as well as rapid shape recovery. We show that compared to clinically used gauze, gelatin sponge, CELOX™, and CELOX™-gauze, the MACS provides higher pro-coagulant and hemostatic capacities in lethally normal and heparinized rat and pig liver perforation wound models. We demonstrate its anti-infective activity against
S. aureus
and
E. coli
and its promotion of liver parenchymal cell infiltration, vascularization, and tissue integration in a rat liver defect model. Overall, the MACS demonstrates promising clinical translational potential in treating lethal noncompressible hemorrhage and facilitating wound healing.
Developing effective treatments for noncompressible hemorrhages remains a challenge. Here the authors engineer alkylated chitosan sponges with highly interconnective microchannels and demonstrate anti-infective activity, as well as higher pro-coagulant, hemostatic and wound healing capacities compared to clinically-used materials in rat and pig liver models.
Journal Article
New Alkylpyridinium Anthraquinone, Isocoumarin, C-Glucosyl Resorcinol Derivative and Prenylated Pyranoxanthones from the Culture of a Marine Sponge-Associated Fungus, IAspergillus stellatus/I KUFA 2017
An unreported isocoumarin, (3S,4R)-4-hydroxy-6-methoxymellein (2), an undescribed propylpyridinium anthraquinone (4), and an unreported C-glucosyl resorcinol derivative, acetyl carnemycin E (5c), were isolated, together with eight previously reported metabolites including p-hydroxybenzaldehyde (1), 1,3-dimethoxy-8-hydroxy-6-methylanthraquinone (3a), 1,3-dimethoxy-2,8-dihydroxy-6-methylanthraquinone (3b), emodin (3c), 5[(3E,5E)-nona-3,5-dien-1-yl]benzene (5a), carnemycin E (5b), tajixanthone hydrate (6a) and 15-acetyl tajixanthone hydrate (6b), from the ethyl acetate extract of the culture of a marine sponge-derived fungus, Aspergillus stellatus KUFA 2017. The structures of the undescribed compounds were elucidated by 1D and 2D NMR and high resolution mass spectral analyses. In the case of 2, the absolute configurations of the stereogenic carbons were determined by comparison of their calculated and experimental electronic circular dichroism (ECD) spectra. The absolute configurations of the stereogenic carbons in 6a and 6b were also determined, for the first time, by X-ray crystallographic analysis. Compounds 2, 3a, 3b, 4, 5a, 5b, 5c, 6a, and 6b were assayed for antibacterial activity against four reference strains, viz. two Gram-positive (Staphylococcus aureus ATCC 29213, Enterococcus faecalis ATCC 29212) and two Gram-negative (Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC 27853), as well as three multidrug-resistant strains. However, only 5a exhibited significant antibacterial activity against both reference and multidrug-resistant strains. Compound 5a also showed antibiofilm activity against both reference strains of Gram-positive bacteria.
Journal Article
A cost-effective measure to prevent hemorrhage in ultrasound-guided percutaneous liver biopsy
Background
Liver biopsy is a procedure whereby a biopsy needle is used to extract tissue from the liver parenchyma or focal lesions of the liver for pathological or microbiological examination. Percutaneous liver biopsy(PC-LB) is the most commonly employed and least expensive modality. However, it is associated with a significant risk of bleeding complications, which may potentially result in patient mortality. The objective of this study was to investigate the efficacy of Absorbable Gelatin Sponge sheet filler agent (AGS-SFA) in preventing bleeding complications during liver tissue biopsy and to validate a cost-effective surgical technique.
Methods
In this study, patients who underwent ultrasound-guided percutaneous liver tissue biopsy at our hospital were selected and randomly assigned to either an observation or control group. The observation group employed the use of AGS-SFA to fill the biopsy needle channel. Immediately following the biopsy procedure, the biopsy needle path was examined using Doppler ultrasound. The incidence of bleeding complications following biopsy and the associated factors influencing bleeding were analysed in the two groups.
Results
The observation and control groups were successfully biopsied, with a 100% success rate for both. The incidence of bleeding complications was significantly lower in the observation group than in the control group. Four factors, including fatty liver, prothrombin time, albumin and INR, were found to have a significant effect on biopsy bleeding in the control group.
Conclusion
The use of coaxial needles to inject AGS-SFA is an effective and economical procedure that significantly improves the safety of biopsy without increasing the burden of patient care.
Journal Article
Phyllofenones F–M, Scalarane Sesterterpenes from the Marine Sponge IPhyllospongia foliascens/I
Eight new scalarane sesterterpenes, phyllofenones F–M (1–8), together with two known analogues, carteriofenones B and A (9–10), were isolated from the marine sponge Phyllospongia foliascens collected from the South China Sea. The structures of these compounds were determined based on extensive spectroscopic and quantum chemical calculation analysis. The antibacterial and cytotoxic activity of these compounds was evaluated. Among them, only compounds 4 and 6 displayed weak inhibitory activity against Staphylococcus aureus and Escherichia coli, with MIC values of 16 μg/mL and 8 μg/mL, respectively. Compounds 1–10 exhibited cytotoxic activity against the HeLa, HCT-116, H460, and SW1990 cancer cell lines, with IC[sub.50] values ranging from 3.4 to 19.8 μM.
Journal Article
Microbially mediated nutrient cycles in marine sponges
Efficient nutrient cycles mediated by symbiotic microorganisms with their hosts are vital to support the high productivity of coral reef ecosystems. In these ecosystems, marine sponges are important habitat-forming organisms in the benthic community and harbor abundant microbial symbionts. However, few studies have reviewed the critical microbially mediated nutrient cycling processes in marine sponges. To bridge this gap, in this review article, we summarize existing knowledge and recent advances in understanding microbially mediated carbon (C), nitrogen (N), phosphorus (P) and sulfur (S) cycles in sponges, propose a conceptual model that describes potential interactions and constraints in the major nutrient cycles, and suggest that shifting redox state induced by animal behavior like sponge pumping can exert great influence on the activities of symbiotic microbial communities. Constraints include the lack of knowledge on spatial and temporal variations and host behavior; more studies are needed in these areas. Sponge microbiomes may have a significant impact on the nutrient cycles in the world's coral reef ecosystems.
Journal Article
Biodiversity of Porifera in Brazil
ABSTRACT The sponge fauna of Brazil is highly diverse and still underestimated. Until 2011, 443 species were recorded, representing 5.3% of the Porifera diversity worldwide. Nowadays, the complete list of sponge species in Brazil is available online at the Taxonomic Catalog of the Brazilian Fauna (CTFB). This study aimed to present the current state of knowledge about the Porifera biodiversity in Brazil based on the list of valid extant sponge species up to December 2022 in the CTFB and World Porifera Database (WPD). By then, a total of 612 species of sponges were listed from Brazil, including 551 marine and 61 freshwater sponges. Demospongiae is the most diverse class, with 508 species, followed by Calcarea (68), Hexactinellida (19) and Homoscleromorpha (17). Among the Brazilian sponge fauna, 310 species are endemic (50%), with the majority belonging to the Class Demospongiae (256). Marine sponges are distributed across all the Brazilian coast and the regions with the highest number of marine species were the Northeast and Southeast regions, with 343 and 229 species, respectively. Among the hydrographic basins, freshwater sponges are more diverse in the Paraná basin, with 33 species recorded. The sponge diversity in Brazil is probably higher, since these numbers are limited by the collection effort in each region.
Journal Article
Isolation of Scalimides A–L: Iβ/I-Alanine-Bearing Scalarane Analogs from the Marine Sponge ISpongia/I sp
A chemical investigation of a methanol extract of Spongia sp., a marine sponge collected from the Philippines, identified 12 unreported scalarane-type alkaloids—scalimides A–L (1–12)—together with two previously described scalarin derivatives. The elucidation of the structure of the scalaranes based on the interpretation of their NMR and HRMS data revealed that 1–12 featured a β-alanine-substituted E-ring but differed from each other through variations in their oxidation states and substitutions occurring at C16, C24, and C25. Evaluation of the antimicrobial activity of 1–12 against several Gram-positive and Gram-negative bacteria showed that 10 and 11 were active against Micrococcus luteus and Bacillus subtilis, respectively, with MIC values ranging from 4 to 16 μg/mL.
Journal Article