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Rev. bras. farmacogn. vol.22 no.4 Curitiba jul./ago. 2012 Epub 24-Mayo-2012
Mutue T. Fujii*, I; Valéria CassanoII; Abel SentíesIII; Jhoana Díaz-LarreaIII; María Machín-SánchezIV; Mª. Candelaria Gil-RodríguezIV
INúcleo de Pesquisa em Ficologia, Instituto de Botânica, São Paulo, Brazil
IIDepartamento de Botânica, Universidade de São Paulo, São Paulo, Brazil
IIIDepartamento de Hidrobiología, Universidad Autónoma Metropolitana, Iztapalapa, Mexico
IVDepartamento de Biología Vegetal (Botánica), Universidad de La Laguna, Fac. Farmacia, Tenerife, Spain
Different species of Laurencia have proven to be a rich source of natural products yielding interesting bioactive halogenated secondary metabolites, such as terpenoids and acetogenins. It is shown that such compounds are accumulated in the spherical, reniform to claviform refractive inclusions called corps en cerise (CC), which are intensively osmiophilic and located mainly in the cortical cells of the thalli and also in trichoblast cells. Up to now, it was believed that CC were present only in these two kinds of cells. Recently, however, a species of Laurencia, L. marilzae, with CC in all cells of the thallus, i.e., cortical, medullary, including the pericentral and axial cells, as well as in the trichoblasts, was described from the Canary Islands, and subsequently also reported to Brazil and Mexico. Within the Laurencia complex, only Laurencia species produce CC. Since the species of Laurencia are targets of interest for the prospection of bioactive substances due to their potential antibacterial, antifungal, anticholinesterasic, antileishmanial, cytotoxic, and antioxidant activities, the present paper carries out a comparative analysis of the corps en cerise in several species of Laurencia from the Atlantic Ocean to obtain basic information that can support natural product bioprospection projects. Our results show that the number and size of the CC are constant within a species, independent of the geographical distribution, corroborating their use for taxonomical purposes to differentiate groups of species that present a lower number from those that have a higher number. In this regard, there was a tendency for the number of CC to be higher in some species of Laurencia from the Canary Islands. The presence of CC can also be used to distinguish species in which these organelles are present in all cells of the thallus from those in which CC are restricted to the cortical cells. Among the species analyzed, L. viridis displayed the most varied secondary metabolites composition, such as sesquiterpenes, diterpenes, triterpenes, all of which showed potent antiviral, cytotoxic, and antitumoral activities, including protein phosphatase type 2A (PP2A) inhibitory effects.
Keywords: biological activities, corps en cerise, Laurencia, Rhodophyta, secondary metabolites
The species of Laurencia J.V. Lamouroux sensu lato (Ceramiales, Rhodophyta) are an extremely rich source of halogenated secondary metabolites with diverse structural features (Fenical & Norris, 1975; Martín & Darias, 1978; Erickson, 1983; Pereira & Teixeira, 1999) that can be divided into two groups according to their biogenetic origin. The first one is the nonterpenoid group, which contains the acetogenins derived from the metabolism of fatty acids. The other one is the terpenoid group, in which the sesquiterpenes are the most abundant, but also containing diterpenes and triterpenes (Pereira & Teixeira, 1999; Fernández et al., 2005; Cen-Pacheco et al., 2011a).
The prominent bioactivity of marine terpenes is evident in their ecological role and makes them interesting as potential drugs. Many marine algae, especially those from tropical and subtropical seas, are able to produce a wide range of compounds, many of which exhibit at least some degree of bioactivity (Fernández et al., 1998, 2005; Da Gama et al., 2002; Cassano et al., 2008a; Lhullier et al., 2009; Santos et al., 2010; Machado et al., 2011; Stein et al., 2011a, b).
Laurencia sensu lato is characterized by its uniaxial construction, with two to four pericentral cells, depending on the genus. Laurencia presents four pericentral cells per vegetative axial segment, while Chondrophycus (Tokida & Saito) Garbary & J.T. Harper, Osmundea Stackhouse, Palisada (Yamada) K.W. Nam, and Yuzurua (K.W. Nam) Martin-Lescanne have two. The thalli can be terete or have a certain degree of flatness up to completely flattened, entirely corticated, and with the apical cell always immersed at the bottom of the apical pit, from which dichotomously branched colourless trichoblasts develop. The cortical cells contain photosynthetic pigments arranged in the thylakoids, while other internal cells are colourless. The Laurencia species are differentiated from all other members of the Laurencia complex by the presence of refractive specific intra-cellular organelles called corps en cerise (CC) (Feldmann & Feldmann, 1950). These organelles occur as intracellular membrane-bound vesicles in trichoblasts and in the outermost cortical cells. In Brazil, they were observed for the first time in Laurencia dendroidea J. Agardh (as L. obtusa) and L. oliveirana Yoneshigue from the southeastern Brazilian coast (Yoneshigue, 1985). Their shape varies from spherical, reniform to claviform, and a connection to the cell wall is frequently observed. These organelles were confirmed as the main storage site for halogenated compounds (Young et al., 1980; Salgado et al., 2008; Paradas et al., 2010).
Dworjanyn et al. (1999) confirmed the localization of bioactive secondary metabolites in the red alga Dilsea pulcra (Greville) Montagne in the central vesicle of gland cells using a combination of fluorescence microscopy, culture studies and quantitative chemical analyses. Paul et al. (2006) also confirmed the localization of natural products in the gland cells of tetrasporophytes of Asparagopsis armata Harvey using different microscopy techniques. Salgado et al. (2008) used time-lapse videomicroscopy to observe exocytosis of vesicles in the cortical cells of L. dendroidea (as L. obtusa). These authors suggested that exocytosis specifically transports the halogenated compounds to the surface and that variations in this mechanism could result in different concentrations of the compounds on the algal surface. Paradas et al. (2010) have also demonstrated that variations in temperature, irradiance level, and desiccation can influence the transport of vesicles from the CC to the cell wall region in clones of L. dendroidea (as L. obtusa).
The morphology of the CC varies depending on the availability of bromine (Br) in seawater. It was also shown that Br depletion resulted in a reduction in halogenated compounds and an increase in bacterial density over the surface of the algal thallus (Paul et al., 2006). However, the number of CC present per cell within the same species is usually constant (Nam et al., 1994; Furnari et al., 2001; Fujii & Sentíes, 2005; Fujii et al., 2011). Among the Laurencia species reported from Brazil (Fujii et al., 2011), only L. translucida M.T. Fujii & Cordeiro-Marino does not possess CC in its thallus; instead, the outermost cortical cells are small and translucent with few plastids in them, while the inner cells are larger and present photosynthetic pigments and other organelles as in all red algae (Fujii & Cordeiro-Marino, 1996). The authors suggested that the main function of translucent cells is to store still unidentified volatile substances, responsible for the sweet smell characteristic of the species.
Recently, Gil-Rodríguez et al. (2009) proposed a new species, L. marilzae Gil-Rodríguez, Sentíes, Díaz-Larrea, Cassano & M.T. Fujii, from the Canary Islands (Spain), that differs from all other species of the genus by presenting CC (one per cell) in all cells of the thallus (cortical, medullary, including pericentral and axial cells, and trichoblasts). The species also produces unique secondary metabolites, not found in any other species of Laurencia, such as dactylomelane (diterpene), 12-epoxyobtusallene IV, obtusallene X, marilzallene, (+)-4-acetoxymarilzallene, (-)-4-acetoxymarilzallene, Z- and E-Adrienyne, obtusallene IV (C15 acetogenins), and marilzabicycloallenes A-D (nonterpenoid bromoallenes) (Fernandez et al., 2005; Gutiérrez-Cepeda et al., 2011a, b). Rocha-Jorge et al. (2010) and Sentíes et al. (2011) have subsequently found L. marilzae in the western Atlantic Ocean in the Laje de Santos Marine State Park, São Paulo (Brazil), and in the Mexican Caribbean at Isla Mujeres, Quintana Roo, respectively. The taxonomic identification was corroborated by using the plastid-encoded rbcL gene as molecular marker.
Since species of Laurencia are targets of interest for the prospection of bioactive substances with potential as antibacterial, antifungal, anticolinesterasical, antileishmanial, cytotoxic, and antioxidant agents (Machado et al., 2011; Cen-Pacheco et al., 2011b; Fujii et al., 2011; Gressler et al., 2011; Stein et al., 2011a, b) and since the number of CC in the cortical cells can be useful as taxonomical criterion for distinguishing species of Laurencia (Masuda & Abe, 1993; Nam et al., 1994; Abe et al., 1998), the present paper carries out a comparative analysis of the number, shape and location of the CC in several species of Laurencia from the Atlantic Ocean to obtain basic information in support of natural product bioprospection projects.
Materials and Methods
For this study, five species of Laurencia were selected: L. caduciramulosa Masuda & Kawaguchi, L. catarinensis Cordeiro-Marino & M.T. Fujii, L. dendroidea J. Agardh, L. marilzae and L. viridis Gil-Rodríguez & Haroun. The samples were collected in Brazil, the Canary Islands and the Mexican Caribbean in 2006-2009. The analysis of the number, size, shape and location of the CC in the thalli, as well as different strategies to accumulate natural defense compounds, were observed in living material. The CC were analyzed in surface view and in transversal and/or longitudinal hand-sections of the thalli. The photographs were taken with a digital camera coupled to a Zeiss microscope (Göettingen, Germany) and/or by photomicrography on a Zeiss Axioskop 2 microscope (Göettingen, Germany).
Laurencia marilzae: Spain, Canary Islands, Tenerife, Punta del Hidalgo, 12.vii.2006, leg. M.T. Fujii, A. Sentíes and M.C. Gil-Rodríguez (SP 365661; TFC Phyc. 13129), Brazil, São Paulo, Laje de Santos Marine State Park, Parcel do Sul, 25.iii.2007, leg. R. Rocha-Jorge (SP 399814), 18.viii.2008, leg. R. Rocha-Jorge (SP 399826), Mexico, Quintana Roo, Isla Mujeres, 16.xi.2008, leg. A. Sentíes and M.T. Fujii (UAMIZ 1019), 10.vi.2009, leg. A. Sentíes and K.M. Dreckmann (UAMIZ 1020); L. dendroidea: Spain, Canary Islands, Tenerife, Puerto de la Cruz, 13.vii.2006, leg. M.T. Fujii, A. Sentíes and M.C. Gil-Rodríguez (SP 365.663; TFC Phyc. 13131), Brasil, Rio de Janeiro, Baía da Ilha Grande, Angra dos Reis, Saco de Piraquara de Fora, Praia do Velho, 22.i.2006, leg. V. Cassano and J.C. De-Paula (SP 399882), Armação dos Búzios, Praia Rasa, 01.ii.2006, leg. V. Cassano (SP 399802); Laurencia viridis: Spain, Canary Islands, Tenerife, Playa Paraiso, 14.vii.2006, leg. M.T. Fujii, A. Sentíes and M.C. Gil-Rodríguez (SP 365662; TFC Phyc. 13130); L. caduciramulosa: Spain, Canary Islands, Tenerife, Punta del Hidalgo, 12.vii.2006, leg. M.T. Fujii, A. Sentíes and M.C. Gil-Rodríguez (TFC Phyc 13205), Brazil, Rio de Janeiro, Baía da Ilha Grande, Angra dos Reis, Saco de Piraquara de Fora, Praia do Velho, 22.i.2006, leg. V. Cassano and J.C. De-Paula (SP 371292), Ponta do Arame, 22.i.2006, leg. V. Cassano and J.C. De-Paula (SP 399918); L. catarinensis: Brazil, Espírito Santo, Anchieta, Ponta dos Castelhanos, 05.x.2006, leg. M.T. Fujii and V. Cassano (SP 399937), Rio de Janeiro, Angra dos Reis, Baía da Ribeira, Saco de Piraquara de Dentro, Ponta da Fortaleza, 14.xii.2006, leg. V. Cassano, M.T.M. de Széchy and M.T. Fujii (SP 399890).
Results and Discussion
A comparative study of the number, size, shape and location of the CC for Laurencia caduciramulosa, L. catarinensis, L. dendroidea, L. marilzae and L. viridis, as well as the major chemical compounds produced by each species and their main biological activities is shown in Table 1. Except for L. caduciramulosa, all the other species are known only from the Atlantic Ocean (Cordeiro-Marino & Fujii, 1985; Gil-Rodríguez & Haroun, 1992; Cassano et al., 2006, 2008a, b; Gil-Rodríguez et al., 2009; Rocha-Jorge et al., 2010; Sentíes et al., 2010, 2011). Detailed morphological and molecular studies performed recently with species previously identified as L. intricata J.V. Lamouroux and L. majuscula (Harvey) A.H.S. Lucas from the Canary Islands demonstrated that the former corresponds to L. catarinensis (Machín-Sánchez et al., 2012) and the latter to L. dendroidea (Cassano et al., 2012).
The variations of the CC observed in the cells of the thalli and trichoblasts are shown in Figures 1-13. In cortical cells, the number of CC ranged from 1 to 4 among species, varying from only 1 in L. viridis (Figure 1) to 1, rarely 2 in L. caduciramulosa (Figure 3) and L. marilzae (Figure 7), and (1) 2-3 (4) in L. catarinensis and L. dendroidea (Figures 11-13). Although the range of variation was constant within a species, there was a tendency of the numbers of CC to be higher in specimens of L. catarinensis and L. dendroidea from the Canary Islands. What factors may be influencing the slight differences observed in the number of CC in these specimens is difficult to predict, but it is believed that different strategies for secondary metabolite accumulation are related to defense against herbivores in the competitive environment, characteristic of the tropical and subtropical regions. The number of CC per cortical cell also seems to be a useful character for separating groups of species within the Laurencia genus. It was considered to be a critical taxonomic feature, segregating many species that possess a single CC from the few species that have several CC per cortical cell (Masuda & Abe, 1993; Masuda et al., 1998). The shape of the CC also varied from spherical, reniform to claviform (Figures 1, 3, 7 and 11-13). The size of the CC varied and overlaps among the species studied, however L. caduciramulosa, L. marilzae and L. viridis showed the smallest size (5.0-10.0 µm), and L. catarinensis and L. dendroidea the largest size (8.0-13.0 µm) (Table 1).
Regarding the number of CC in the trichoblasts, there is invariably one per cell in all species analyzed, but the shape can vary slightly from spherical, reniform to claviform. The functional roles of algal hairs and trichoblasts have not been clearly established, but various functions have been attributed to them such as aiding resistance against desiccation, nutrient uptake, metabolite secretion, shading and, in the case of the Laurencia complex, except Osmundea, reproduction by the production of female and male gametangia associated with the trichoblasts (Fritsch, 1945; Bold & Wynne, 1985; Delivopoulus, 2002). The similar functions attributed to both, such as nutrient uptake, are reinforced by several morphological similarities such as the presence of few chloroplasts and their position around the apices of the branches (DeBoer & Whoriskey, 1983; Garbary & Clarke, 2001). Laurencia viridis displays a single CC in each cortical cell and in the trichoblast cells. However, the trichoblasts are extremely long (Figure 2) and cover completely the thalli, suggesting that they may act against desiccation and may also confer efficient protection against herbivores, considering that they are chemically defended by the presence of the CC.
A different function for the trichoblasts was verified in Laurencia caduciramulosa; numerous long trichoblasts terminated by strongly recurved hooks were observed in deciduous branchlets (Cassano, 2009) (Figures 5-6), that differ from those branchlets not yet detached from the thalli (Figure 4). These branchlets, which function as vegetative propagules, are its only way of reproduction, since neither gametangia nor sporangia are produced by this species. The development of hooks in trichoblasts has never been described before for any species of the Laurencia complex. The hooks, entangled with each other or with the thalli of other macroalgae, aid in the dispersal of propagules. The formation of rhizoids was verified after mobilization of propagules by hooks. This suggests that the hooks assume the function of assisting the initial fixation of propagules. This is the first time that such a dispersal strategy has been observed. The existence of propagules as an alternative way of reproduction is important to understand the spread of L. caduciramulosa, a species introduced into the Mediterranean Sea (Klein & Verlaque, 2005) and Brazil (Cassano et al., 2006). Laurencia caduciramulosa from the type locality (Vietnam) was chemically characterized by the following halogenated secondary metabolites: aplysiadiol (diterpene), deoxyprepacifenol (sesquiterpene), and laurenenyne A and B (C15 acetogenins) (Masuda et al., 1997), while the Brazilian specimens produced only sesquiterpenes that differ from the mixture of sesquiterpenes and diterpenes reported for speciens from Vietnam. The main compound identified in L. caduciramulosa from Brazil is pacifenol, while filiformin, debromofiliformin, allolaurinterol and debromoallolaurinterol were observed as minority components of the crude extract (Cassano et al., 2008a). The mixture of sesquiterpenes and diterpenes reported for this species from Vietnam has drawn attention to a possible mixture of material in L. caduciramulosa from Vietnam, since the simultaneous production of sesquiterpenes and diterpenes is an uncommon feature in the Laurencia complex (Cassano et al., 2008a).
The crude extract obtained from Brazilian L. caduciramulosa was assayed for its antifouling properties using the mussel Perna perna Linnaeus, 1978, as described by Epifanio et al. (2006) which exhibited more than 70% inhibition (Cassano et al., 2008a). Interestingly, the major component of the crude extract of Laurencia caduciramulosa from Brazil was pacifenol, a compound that has been reported for Laurencia species from the Pacific Ocean and Mediterrenean Sea (Sims et al., 1971; Caccamese et al., 1986; Argandoña et al., 1993) and that was isolated for the first time from Laurencia species introduced into Brazilian waters by transoceanic shipping.
Only Laurencia marilzae possesses CC in every cell of the thallus (Figures 8-9) and, in this case, the shape and size are homogeneous, regardless of their location in cortical and medullary cells or tricoblasts. A similar situation was observed in L. majuscula from Dhofar, the Sultanate of Oman, by Wynne et al. (2005) and from the Mediterranean Sea by Serio et al. (2000) and Furnari et al. (2001). However, the similarities between L. marilzae and L. majuscula from Italy and Oman regarding the color of the thalli, and number and location of CC (one in all cells of the thallus) led Rocha-Jorge et al. (2010) to suggest that they should be the same taxonomic entity, viz., L. marilzae. This fact supports the use of the CC as a criterion for taxonomic recognition of L. marilzae for which the presence of CC in all cells of the thallus seems to be a feature unique to this species.
On the other hand, in Laurencia dendroidea from the Canary Islands, previously identified as L. majuscula by Masuda et al. (1998), up to six CC per each cortical cell were observed, although three-four is more usual. This condition also differs from the specimens from Oman identified by Wynne et al. (2005) and from the Mediterranean Sea identified by Serio et al. (2000) and Furnari et al. (2001) as L. majuscula, which displayed a single CC in all cells of the thallus.
Of the species studied, L. viridis is the most prolific synthesizer of secondary metabolites, producing sesquiterpene, diterpene and a variety of squalene-derived polyether compounds with important pharmacological properties, such as potent cytotoxic effects, protein phosphatase type 2A (PP2A) inhibition and integrin antagonist activity (Norte et al., 1996b, 1997a, 1997b; Fernández et al., 1998; Manríquez et al., 2001; Souto et al., 2002, 2003; Cen-Pacheco et al., 2011a, b). Such a large chemical arsenal produced by a single species is unknown for other species of Laurencia, showing the great biotechnological potential to be explored.
Salgado et al. (2008), studying the localization of bromo-containing products in Laurencia dendroidea (as L. obtusa) from Brazil, confirmed that CC are the main brominated substance accumulation sites. Other species of this study should also work in the same way, since all species without exception, produce some kind of halogenated secondary metabolite and all of them have CC in the cortical cells and in the trichoblasts and in all cells of the thallus in the case of L. marilzae.
This study was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Proc. 473322/2008-0), (CNPq/MCT-Petro, Proc. 557030/2009-9). Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, Proc. 2010/52244-2). Additional support was provided by the Spanish Government Project MEC CGL 2010-14881. M. Machín-Sánchez was financed by a grant from the Canarian Government. MT Fujii thanks CNPq for the Research Productivity Fellowship (Proc. 301438/2009-9). ASG and JDL thank Promep-SEP (UAMI/CA/117).
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Received 1 Dec 2011
Accepted 23 Jan 2012